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Journal articles on the topic 'Photon beam position detector'

Author: Grafiati

Published: 11 March 2023

Last updated: 31 July 2025

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1

Samadi, Nazanin, Bassey Bassey, Mercedes Martinson, et al. "A phase-space beam position monitor for synchrotron radiation." Journal of Synchrotron Radiation 22, no. 4 (2015): 946–55. http://dx.doi.org/10.1107/s1600577515007390.

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The stability of the photon beam position on synchrotron beamlines is critical for most if not all synchrotron radiation experiments. The position of the beam at the experiment or optical element location is set by the position and angle of the electron beam source as it traverses the magnetic field of the bend-magnet or insertion device. Thus an ideal photon beam monitor would be able to simultaneously measure the photon beam's position and angle, and thus infer the electron beam's position in phase space. X-ray diffraction is commonly used to prepare monochromatic beams on X-ray beamlines us

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Khalil, Mohamad, Erik Schou Dreier, Jan Kehres, Jan Jakubek, and Ulrik Lund Olsen. "Subpixel resolution in CdTe Timepix3 pixel detectors." Journal of Synchrotron Radiation 25, no. 6 (2018): 1650–57. http://dx.doi.org/10.1107/s1600577518013838.

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Timepix3 (256 × 256 pixels with a pitch of 55 µm) is a hybrid-pixel-detector readout chip that implements a data-driven architecture and is capable of simultaneous time-of-arrival (ToA) and energy (ToT: time-over-threshold) measurements. The ToA information allows the unambiguous identification of pixel clusters belonging to the same X-ray interaction, which allows for full one-by-one detection of photons. The weighted mean of the pixel clusters can be used to measure the subpixel position of an X-ray interaction. An experiment was performed at the European Synchrotron Radiation Facility in Gr

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Shu, Deming, Tuncer M. Kuzay, Yue Fang, Juan Barraza, and Tim Cundiff. "Synthetic diamond-based position-sensitive photoconductive detector development for the Advanced Photon Source." Journal of Synchrotron Radiation 5, no. 3 (1998): 636–38. http://dx.doi.org/10.1107/s0909049597019778.

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A novel X-ray beam-position detection device that we call a position-sensitive photoconductive detector (PSPCD) is designed to have synthetic diamond as its substrate material. We proved that it is feasible to use synthetic diamond to make a hard X-ray position-sensitive detector based on the photoconductivity principle and that it acts as a solid-state ion chamber. Experiments on different PSPCD samples using synthetic diamond with a high-heat-flux white undulator beam, as well as with monochromatic hard X-ray beams, have been performed at the Advanced Photon Source. Recent test results with

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Lelyukhin, A. S., and D. A. Muslimov. "APPLICATION OF POSITION-SENSITIVE DETECTORS FOR ANALYZING THE ENERGY SPECTRA OF PHOTON RADIATION." Kontrol'. Diagnostika, no. 270 (December 2020): 44–48. http://dx.doi.org/10.14489/td.2020.12.pp.044-048.

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Monitoring the spectral composition of photon radiation from generating sources and emitting objects is the most informative way to analyze the radiation fields created by them. However, it is impossible to study the radiation characteristics of radiation fields of ultra short duration and high intensity using direct measurement methods. This work considers a method for reconstructing the spectral distributions of photon radiation from the profile of the secondary radiation fields recorded by a position-sensitive detector. To implement a new method of measurement in the primary beam of radiati

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Dhoska, Klodian, Helmuth Hofer, Marco López, Toomas Kübarsepp, and Stefan Kück. "Alignment position method for SPAD detector calibration and homogeneity." International Journal of Scientific Reports 1, no. 7 (2015): 271. http://dx.doi.org/10.18203/issn.2454-2156.intjscirep20151253.

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<p><strong>Background:</strong> Over the last decade have seen a drastically increase of interest in the Single photon avalanche diode (SPAD) detectors applications at many variety of quantum experiments where the detection efficiency at single-photon level is required. The calibration of such detectors involves predominantly the determination of the detection efficiency.</p><p><strong>Methods:</strong> The present study was carried out at Department of Photometry and Applied Radiometry, Physikalisch-Technische Bundesanstalt (PTB), National Metrology I

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Hoffman, David, Eunah Chung, Clayton Hess, Robin Stern, and Stanley Benedict. "Characterization and evaluation of an integrated quality monitoring system for online quality assurance of external beam radiation therapy." Journal of Applied Clinical Medical Physics 18, no. 1 (2016): 40–48. http://dx.doi.org/10.1002/acm2.12014.

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AbstractPurposeThe aim of this work was to comprehensively evaluate a new large field ion chamber transmission detector, Integral Quality Monitor (IQM), for online external photon beam verification and quality assurance. The device is designed to be mounted on the linac accessory tray to measure and verify photon energy, field shape, gantry position, and fluence before and during patient treatment.MethodsOur institution evaluated the newly developed ion chamber's effect on photon beam fluence, response to dose, detection of photon fluence modification, and the accuracy of the integrated barome

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Huang, J. Y., and I. S. Ko. "Spatio-temporal measurement of beam properties in the PLS diagnostic beamline." Journal of Synchrotron Radiation 5, no. 3 (1998): 642–44. http://dx.doi.org/10.1107/s090904959702013x.

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A diagnostic beamline is being constructed in the PLS storage ring for measurement of electron- and photon-beam properties. It consists of two 1:1 imaging systems: a visible-light imaging system and a soft X-ray imaging system. In the visible-light imaging system, the transverse beam size and beam position are measured with various detectors: a CCD camera, two photodiode arrays and a photon-beam position monitor. Longitudinal bunch structure is also investigated with a fast photodiode detector and a picosecond streak camera. On the other hand, the soft X-ray imaging system is under constructio

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Smallwood, J. C., S. Bhasin, T. Blake, et al. "Test-beam demonstration of a TORCH prototype module." Journal of Physics: Conference Series 2374, no. 1 (2022): 012004. http://dx.doi.org/10.1088/1742-6596/2374/1/012004.

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The TORCH time-of-flight detector is designed to provide a 15 ps timing resolution for charged particles, resulting in π/K particle identification up to 10 GeV/c momentum over a 10 m flight path. Cherenkov photons, produced in a quartz plate of 10 mm thickness, are focused onto an array of micro-channel plate photomultipliers (MCP-PMTs) which measure the photon arrival times and spatial positions. A half-scale (660 × 1250 × 10 mm3) TORCH demonstrator module has been tested in an 8 GeV/c mixed proton-pion beam at CERN. Customised square MCP-PMTs of active area 53 × 53 mm2 and granularity 64 × 6

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9

Gu Liming, 顾黎明, 孙葆根 Sun Baogen, 申超波 Shen Chaobo, et al. "Photon beam position measurement system based on four-quadrant detector." High Power Laser and Particle Beams 22, no. 12 (2010): 2964–68. http://dx.doi.org/10.3788/hplpb20102212.2964.

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Faj, Dario, Hrvoje Brkic, Vjekoslav Kopacin, et al. "Monte Carlo simulation of photon breast radiotherapy of the pregnant patient beam characteristics." Nuclear Technology and Radiation Protection 39, no. 2 (2024): 154–59. http://dx.doi.org/10.2298/ntrp2402154f.

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This paper aims to describe the photon beam characteristics in terms of energy and angular distribution during breast megavoltage photon radiotherapy of pregnant patients. Photon beam characteristics are investigated at treatment volume (breast) and the position of the fetus in the Tena phantom using Monte Carlo simulation. Photon beam energy spectra are compared across various materials used as substitutes for constructing physical and computational phantoms. Mean energies calculated in substitute materials developed by our group and used to build the Tena phantom, differ up to 10 % from the

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Gianotti, Paola. "The PADME Detector." EPJ Web of Conferences 170 (2018): 01007. http://dx.doi.org/10.1051/epjconf/201817001007.

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The PADME experiment, by using the positron beam of the Frascati laboratory, aims at searching for signals of a dark photon, A′ . It will evaluate the final state missing mass of the process e+ e- → A′ γ by knowing the beam energy and measuring the four-momentum of the ordinary recoil photon. The precise determination of this quantity, and the capability to reject background events, are the key points for the success of the experiment. In this paper a description of each component of the PADME detector is given.

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Gallin-Martel, M. L., L. Abbassi, A. Bes, et al. "A large area diamond-based beam tagging hodoscope for ion therapy monitoring." EPJ Web of Conferences 170 (2018): 09005. http://dx.doi.org/10.1051/epjconf/201817009005.

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The MoniDiam project is part of the French national collaboration CLaRyS (Contrôle en Ligne de l’hAdronthérapie par RaYonnements Secondaires) for on-line monitoring of hadron therapy. It relies on the imaging of nuclear reaction products that is related to the ion range. The goal here is to provide large area beam detectors with a high detection efficiency for carbon or proton beams giving time and position measurement at 100 MHz count rates (beam tagging hodoscope). High radiation hardness and intrinsic electronic properties make diamonds reliable and very fast detectors with a good signal to

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Albicocco, P., R. Assiro, F. Bossi, et al. "Commissioning of the PADME experiment with a positron beam." Journal of Instrumentation 17, no. 08 (2022): P08032. http://dx.doi.org/10.1088/1748-0221/17/08/p08032.

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Abstract The PADME experiment is designed to search for a hypothetical dark photon A' produced in positron-electron annihilation using a bunched positron beam at the Beam Test Facility of the INFN Laboratori Nazionali di Frascati. The expected sensitivity to the A' -photon mixing parameter ϵ is 10-3, for A' mass ≤ 23.5 MeV/c 2 after collecting ∼ 1013 positrons-on-target. This paper presents the PADME detector status after commissioning in July 2019. In addition, the software algorithms employed to reconstruct physics objects, such as photons and charged particles, and the calibration procedure

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Amer, Sabri, Andrew Xu, Aldo Badano, and Eshan Dahal. "Open-Source Data Analysis Tool for Spectral Small-Angle X-ray Scattering Using Spectroscopic Photon-Counting Detector." Sensors 24, no. 16 (2024): 5307. http://dx.doi.org/10.3390/s24165307.

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Spectral small-angle X-ray scattering (sSAXS) is a powerful technique for material characterization from thicker samples by capturing elastic X-ray scattering data in angle- and energy-dispersive modes at small angles. This approach is enabled by the use of a 2D spectroscopic photon-counting detector that provides energy and position information of scattered photons when a sample is irradiated by a polychromatic X-ray beam. Here, we describe an open-source tool with a graphical interface for analyzing sSAXS data obtained from a 2D spectroscopic photon-counting detector with a large number of e

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15

Galimberti, A., C. J. Bocchetta, C. Fava, et al. "A new detector for photon beam position monitoring designed for synchrotron radiation beamlines." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 477, no. 1-3 (2002): 317–22. http://dx.doi.org/10.1016/s0168-9002(01)01845-9.

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Huang, C. H., C. K. Chou, C. M. Cheng, et al. "The positional relationship between eBPM in the storage ring, XBPM in the frontend and DBPM in the beamline." Journal of Physics: Conference Series 3010, no. 1 (2025): 012065. https://doi.org/10.1088/1742-6596/3010/1/012065.

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Abstract The Taiwan Photon Source (TPS) employs various types of beam position monitors (BPMs) to ensure beam stability and provide feedback during routine operations. These include electron BPMs (eBPMs), X-ray BPMs (XBPMs), and diamond BPMs (DBPMs). Each type of BPM plays a crucial role in monitoring different aspects of beam behavior. For the electron beam’s positional shifts, the position shift detected by the XBPM closely corresponds with that observed by the eBPM shift. However, the position shifts measured by DBPMs are typically smaller compared to those detected by eBPMs. This discrepan

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Istatiadis, E., I. Kuvvetli, S. R. H. Owe, A. Cherlin, and C. Budtz-Jørgensen. "A novel theoretical model framework for the 3D CdZnTe drift strip detector." Journal of Instrumentation 20, no. 02 (2025): C02014. https://doi.org/10.1088/1748-0221/20/02/c02014.

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Abstract Advances in data analysis and model prediction offer new potential for enhancing radiation measurement technologies, particularly in detector characterization and real-time signal analysis. A key challenge is creating realistic detector models that accurately describe the complex physical processes of photon-matter interaction, signal formation including material characteristics, and measurement to enhance design optimization and detector physics understanding. This research study introduces the development of an Advanced Theoretical Detector Model (ATDM) framework to evaluate the phy

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Peng, X., J. Zhu, L. He, et al. "Simulation study on optical transmission performance and time resolution of Shashlik tower." Journal of Instrumentation 18, no. 02 (2023): P02018. http://dx.doi.org/10.1088/1748-0221/18/02/p02018.

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Abstract The Shashlik tower is a significant component to measure the energy, time, and position of photons and electrons in the Electromagnetic Calorimeter (ECal), a vital detector of the Multi-Purpose Detector (MPD) in the Nuclotron-based lon Collider fAcility (NICA), Dubna, Russia. Based on the GEANT4 simulation toolkit, a variation of physical behavior in the tower was simulated, including the changes of photons during transmission, and used the rising edge detection method to measure the time-resolving ability of the module for natural muons and electron beams. Results show that 3 GeV ele

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Santra, A. "Detector challenges of the strong-field QED experiment LUXE at the European XFEL." Journal of Instrumentation 18, no. 08 (2023): C08003. http://dx.doi.org/10.1088/1748-0221/18/08/c08003.

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Abstract The LUXE experiment aims at studying high-field QED in electron-laser and photon-laser interactions, with the 16.5 GeV electron beam of the European XFEL and a laser beam with power of up to 350 TW. This experiment will use one electron bunch out of 2700 bunches per train from XFEL. The experiment will measure the multiplicity spectra of electrons, positrons and photons in expected ranges of 10-3 to 109 particles per 1 Hz bunch crossing, depending on the laser power and focus. These measurements have to be performed in the presence of low-energy high radiation-background. To meet thes

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Rivera, Elaine Loraine P., Dainna Recel S. Pamisa, and Catherine Therese J. Quiñones. "Kinetic Energy of Secondary Particles Produced from Various Electromagnetic Interactions in Water: A Monte Carlo Study." Materials Science Forum 1102 (October 24, 2023): 179–86. http://dx.doi.org/10.4028/p-ik9fbi.

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Advancements in imaging systems including Electronic Portal Imaging Devices (EPIDs) play a great role in radiotherapy treatment. It was developed as a verification tool for patient setup during radiotherapy sessions and also become a promising tool for the determination of the accurate placement of radiation beams. However, as part of quality assurance, individual patient treatments are often verified by patient-specific quality control measurements such as before treatment (pretreatment) or during treatment (in vivo). It has been shown that in vivo dosimetry using an electronic portal imaging

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Liu, D. G., C. H. Chang, L. C. Chiang, et al. "Optical design and performance of the biological small-angle X-ray scattering beamline at the Taiwan Photon Source." Journal of Synchrotron Radiation 28, no. 6 (2021): 1954–65. http://dx.doi.org/10.1107/s1600577521009565.

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The optical design and performance of the recently opened 13A biological small-angle X-ray scattering (SAXS) beamline at the 3.0 GeV Taiwan Photon Source of the National Synchrotron Radiation Research Center are reported. The beamline is designed for studies of biological structures and kinetics in a wide range of length and time scales, from angstrom to micrometre and from microsecond to minutes. A 4 m IU24 undulator of the beamline provides high-flux X-rays in the energy range 4.0–23.0 keV. MoB4C double-multilayer and Si(111) double-crystal monochromators (DMM/DCM) are combined on the same r

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Sorokin, Andrey A., Yilmaz Bican, Susanne Bonfigt, et al. "An X-ray gas monitor for free-electron lasers." Journal of Synchrotron Radiation 26, no. 4 (2019): 1092–100. http://dx.doi.org/10.1107/s1600577519005174.

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A novel X-ray gas monitor (XGM) has been developed which allows the measurement of absolute photon pulse energy and photon beam position at all existing and upcoming free-electron lasers (FELs) over a broad spectral range covering vacuum ultraviolet (VUV), extreme ultraviolet (EUV) and soft and hard X-rays. The XGM covers a wide dynamic range from spontaneous undulator radiation to FEL radiation and provides a temporal resolution of better than 200 ns. The XGM consists of two X-ray gas-monitor detectors (XGMDs) and two huge-aperture open electron multipliers (HAMPs). The HAMP enhances the dete

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Dragoi, Danut. "Computational (ω, φ) X-ray Diffractometry for Single Crystal Analysis". Advances in X-ray Analysis 38 (1994): 277–82. http://dx.doi.org/10.1154/s0376030800017894.

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Abstract (ω, φ) X-ray Diffraetometry is a method of XRD based on two independent variables, ω–the rotation of the sample around an axis contained in the plane of the sample and normal to the incident beam, and-the rotation of the sample in its own plane. Each crystallographic plane has an φ peak position, i.e. diffracted intensity is a maximum at a particular ω position for a given φ position. The incident X-ray beam is considered to be parallel, (a divergence of 0.1 degrees or less is accepted), very narrow (the width of the beam is not critical, a width of 0.1 mm or less is accepted), and mo

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Samadi, Nazanin, Xianbo Shi, and Dean Chapman. "Optimization of a phase-space beam position and size monitor for low-emittance light sources." Journal of Synchrotron Radiation 26, no. 6 (2019): 1863–71. http://dx.doi.org/10.1107/s1600577519010658.

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The recently developed vertical phase-space beam position and size monitor (ps-BPM) system has proven to be able to measure the electron-source position, angle, size and divergence simultaneously in the vertical plane at a single location of a beamline. The optimization of the ps-BPM system is performed by ray-tracing simulation to maximize the instrument sensitivity and resolution. The contribution of each element is studied, including the monochromator, the K-edge filter, the detector and the source-to-detector distance. An optimized system is proposed for diffraction-limited storage rings,

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Mahani, Hojjat, Ali Taheri, and Mojtaba Askari. "Detection performance of pixelated lutetium–yttrium oxyorthosilicate (LYSO) scintillators for high-resolution photon-counting CT imaging." Review of Scientific Instruments 94, no. 2 (2023): 023308. http://dx.doi.org/10.1063/5.0125952.

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High-resolution photon-counting detector (PCD) computed tomography (CT) imaging is increasingly used for several applications. Recent technological advances in CT instrumentation have introduced various types of radiation detectors. Therefore, this work aims at evaluating the lutetium–yttrium oxyorthosilicate (LYSO) scintillator for use in PCD CT from a detector point of view. To do so, a mini-CT prototype was designed and constructed based on the pixelated LYSO blocks. The detector comprises four 10 × 10 linearly arranged LYSO blocks coupled with four position-sensitive photomultiplier tubes.

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Ying, Andrew, Braxton Osting, I. C. Noyan, Conal E. Murray, Martin Holt, and Jörg Maser. "Modeling of kinematic diffraction from a thin silicon film illuminated by a coherent, focused X-ray nanobeam." Journal of Applied Crystallography 43, no. 3 (2010): 587–95. http://dx.doi.org/10.1107/s0021889810008459.

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A rigorous model of a diffraction experiment utilizing a coherent, monochromatic, X-ray beam, focused by a Fresnel zone plate onto a thin, perfect, single-crystal layer is presented. In this model, first the coherent wave emanating from an ideal zone plate equipped with a direct-beam stop and order-sorting aperture is computed. Then, diffraction of the focused wavefront by a thin silicon film positioned at the primary focal spot is calculated. This diffracted wavefront is propagated to the detector position, and the intensity distribution at the detector plane is extracted. The predictions of

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Peng, X., K. Zhu, X. Ji, et al. "Simulation study on photon generation and collection of tower applied to NICA-MPD electromagnetic calorimeter." Journal of Instrumentation 17, no. 01 (2022): T01004. http://dx.doi.org/10.1088/1748-0221/17/01/t01004.

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Abstract Shashlik tower, which is composed of absorbers and scintillators alternately, surrounded by reflector and coupled with Silicon Photomultiplier (SiPM) by Wavelength-Shifting (WLS) fibers, is a significant component to measure the energy and position of photons and electrons in Electromagnetic Calorimeter (ECal), a key detector of the Multi Purpose Detector (MPD) at the Nuclotron-based Ion Collider facility (NICA) in Russia. In this paper, the effect of materials adopted for absorber, reflector and WLS fiber, the length and curvature of fibers and the electrons incident position on phot

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Juanhuix, Jordi, Fernando Gil-Ortiz, Guifré Cuní, et al. "Developments in optics and performance at BL13-XALOC, the macromolecular crystallography beamline at the Alba Synchrotron." Journal of Synchrotron Radiation 21, no. 4 (2014): 679–89. http://dx.doi.org/10.1107/s160057751400825x.

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BL13-XALOC is currently the only macromolecular crystallography beamline at the 3 GeV ALBA synchrotron near Barcelona, Spain. The optics design is based on an in-vacuum undulator, a Si(111) channel-cut crystal monochromator and a pair of KB mirrors. It allows three main operation modes: a focused configuration, where both mirrors can focus the beam at the sample position to 52 µm × 5.5 µm FWHM (H × V); a defocused configuration that can match the size of the beam to the dimensions of the crystals or to focus the beam at the detector; and an unfocused configuration, where one or both mirrors ar

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Shekhtman, L., F. Ignatov, and V. Tayursky. "Simulation of physics background in Super c-tau factory detector." EPJ Web of Conferences 212 (2019): 01009. http://dx.doi.org/10.1051/epjconf/201921201009.

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Simulation of background particle fluxes generated by colliding beams is performed with FLUKA package for the Super C-Tau factory Detector (SCTD). Two processes are considered as main sources of luminosity generated background: two-photon production of electron-positron pairs and Bha-Bha scattering with bremsstrahlung photon emission (radiative Bha-Bha). The SCTD geometry is described corresponding to the last version of the Conceptual Design Report. The magnetic field based on the calculation in ANSYS is introduced in the model. Main results of the simulation for beam energy of 3 GeV, luminos

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Dimitrova, Kalina. "Using Artificial Intelligence in the Reconstruction of Signals from the PADME Electromagnetic Calorimeter." Instruments 6, no. 4 (2022): 46. http://dx.doi.org/10.3390/instruments6040046.

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The PADME apparatus was built at the Frascati National Laboratory of INFN to search for a dark photon (A′) produced via the process e+e−→A′γ. The central component of the PADME detector is an electromagnetic calorimeter composed of 616 BGO crystals dedicated to the measurement of the energy and position of the final state photons. The high beam particle multiplicity over a short bunch duration requires reliable identification and measurement of overlapping signals. A regression machine-learning-based algorithm has been developed to disentangle with high efficiency close-in-time events and prec

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Di Fraia, Michele, Antonio De Sio, Matias Antonelli, et al. "Fast beam monitor diamond-based devices for VUV and X-ray synchrotron radiation applications." Journal of Synchrotron Radiation 26, no. 2 (2019): 386–92. http://dx.doi.org/10.1107/s1600577519000791.

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The improved performance of third-generation light sources and the advent of next-generation synchrotron radiation facilities require the use of extremely precise monitoring of the main photon-beam parameters, such as position, absolute and relative intensity, and temporal structure. These parameters, and associated real-time feedbacks, are fundamental at the beamline control level and at the machine control level, to improve the stability of the photon beams and to provide bunch-to-bunch quantitative information. Fast response time, high radiation hardness and visible–blind response are main

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Gallice, N. "Xenon doping of liquid argon in ProtoDUNE single phase." Journal of Instrumentation 17, no. 01 (2022): C01034. http://dx.doi.org/10.1088/1748-0221/17/01/c01034.

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Abstract The Deep Underground Neutrino Experiment (DUNE) will be the next generation long-baseline neutrino experiment. The far detector is designed as a complex of four LAr-TPC (Liquid Argon Time Projection Chamber) modules with 17 kt of liquid argon each. The development and validation of the first far detector technology is pursued through ProtoDUNE Single Phase (ProtoDUNE-SP), a 770 t LAr-TPC at CERN Neutrino Platform. Crucial in DUNE is the photon detection system that will ensure the trigger of non-beam events — proton decay, supernova neutrino burst and BSM searches — and will improve t

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Yang, Junliang, Tang Li, Ye Zhu, Xiaowei Zhang, Atsushi Waseda, and Hiroyuki Fujimoto. "High-efficiency ultra-precision comparator for d-spacing mapping measurement of silicon." Journal of Synchrotron Radiation 27, no. 3 (2020): 577–82. http://dx.doi.org/10.1107/s1600577520001496.

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This article describes a high-efficiency experimental configuration for a self-referenced lattice comparator with a `brush beam' of synchrotron radiation from a bending magnet and two linear position-sensitive photon-counting-type X-ray detectors. The efficiency is more than ten times greater compared with the `pencil-beam' configuration and a pair of zero-dimensional detectors. A solution for correcting the systematic deviation of d-spacing measurements caused by the horizontal non-uniformity of the brush beam is provided. Also, the use of photon-counting-type one-dimensional detectors not on

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Zhao, F., G. Lo Curto, L. Pasquini, et al. "Measuring and characterizing the line profile of HARPS with a laser frequency comb." Astronomy & Astrophysics 645 (December 22, 2020): A23. http://dx.doi.org/10.1051/0004-6361/201937370.

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Aims. We study the 2D spectral line profile of the High Accuracy Radial Velocity Planet Searcher (HARPS), measuring its variation with position across the detector and with changing line intensity. The characterization of the line profile and its variations are important for achieving the precision of the wavelength scales of 10−10 or 3.0 cm s−1 necessary to detect Earth-twins in the habitable zone around solar-like stars. Methods. We used a laser frequency comb (LFC) with unresolved and unblended lines to probe the instrument line profile. We injected the LFC light – attenuated by various neu

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Ellis, Malcolm. "A Scintillating Fibre Tracker for MICE." International Journal of Modern Physics A 20, no. 16 (2005): 3815–19. http://dx.doi.org/10.1142/s0217751x05027709.

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The provision of intense stored muon beams would allow the properties of neutrinos to be measured precisely and provide a route to multi-TeV lepton-anti-lepton collisions. The short muon lifetime makes it impossible to employ traditional cooling techniques while maintaining the muon-beam intensity. Ionisation cooling, a process in which the muon beam is passed through a series of liquid hydrogen absorbers followed by accelerating RF-cavities, is the proposed cooling technique. The international Muon Ionisation Cooling Experiment (MICE) collaboration has been approved at the Rutherford Appleton

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Yamaguchi, Mitsutaka, Yuto Nagao, Naoki Kawachi, et al. "Detection of a gas region in a human body across a therapeutic carbon beam by measuring low-energy photons." International Journal of PIXE 26, no. 01n02 (2016): 61–72. http://dx.doi.org/10.1142/s0129083516500078.

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We studied feasibility of detection of a gap which is located across a beam track by measuring low-energy (63–68 keV) photons generated by beam irradiation. An experiment was performed with the Heavy Ion Medical Accelerator in Chiba (HIMAC). A 12C beam having 290 MeV/u was injected on a target consisting of two acrylic blocks. These two blocks were placed with a 10 mm gap along the beam axis. A detection system consisting of a semiconductor detector, a lead collimator having a slit, and borated polyethylene blocks was placed on a movable stage to detect low-energy photons emitted perpendicular

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Alya, Nur, Robert Janssen Stevenly, Pratiwi Sri Wardani, and Erlinda Ratnasari Putri. "Effect of Radiation Position of Photon Beam at Axis Point and Field Edge on Absorbed Dose on Linear Accelerator (Linac)." Jurnal Inotera 9, no. 1 (2024): 103–10. http://dx.doi.org/10.31572/inotera.vol9.iss1.2024.id307.

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    Radiotherapy is a medical treatment that uses ionizing radiation to kill cancer cells using a Linear Accelerator (Linac). One of the errors in radiotherapy irradiation can occur because the radiation beam that comes out is not in accordance with the planning. Therefore, radiation absorbed dose measurement is needed to carry out as a quality assurance to control the accuracy and suitability of the dose to be received by the patient by following the standards of the Technical Report Series (TRS) 398. This study was conducted at Radiotherapy Installation of RSUD A.W. S

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Czogalik, M., C. Nociforo, M. Alfonsi, et al. "Plastic scintillator fiber detectors for heavy ion trajectory reconstruction for the Super-FRS at FAIR." Journal of Instrumentation 19, no. 06 (2024): C06008. http://dx.doi.org/10.1088/1748-0221/19/06/c06008.

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Abstract At the FAIR facility, currently under construction at GSI (Darmstadt), a 1.5 AGeV uranium beam with intensities up to 2.5 × 1011 238U/spill will impinge on a graphite target at the entrance of the Super-FRS for the production of a wide range of rare isotopes by projectile fission and fragmentation. The next generation in-flight magnetic separator Super-FRS, operated up to a magnetic rigidity of 20 Tm with a large angular acceptance (Δθ = ± 40 mrad, Δϕ = ± 20 mrad) and momentum acceptance (Δ p/p = ± 2.5%), requires a new generation of tracking detectors with a position resolution of 0.

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Sharma, S., J. Baran, R. S. Brusa, et al. "J-PET detection modules based on plastic scintillators for performing studies with positron and positronium beams." Journal of Instrumentation 18, no. 02 (2023): C02027. http://dx.doi.org/10.1088/1748-0221/18/02/c02027.

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Abstract The J-PET detector, which consists of inexpensive plastic scintillators, has demonstrated its potential in the study of fundamental physics. In recent years, a prototype with 192 plastic scintillators arranged in 3 layers has been optimized for the study of positronium decays. This allows performing precision tests of discrete symmetries (C, P, T) in the decays of positronium atoms. Moreover, thanks to the possibility of measuring the polarization direction of the photon based on Compton scattering, the predicted entanglement between the linear polarization of annihilation photons in

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Wu, Hsiang-Ning, Chia-Hao Chang, and Yu-Ching Ni. "An X-ray fluorescence experimental method for photon-counting detector in computed tomography system." Journal of Instrumentation 19, no. 10 (2024): T10001. http://dx.doi.org/10.1088/1748-0221/19/10/t10001.

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Abstract The X-ray fluorescence (XRF) spectrum of specific elements can be utilized in energy calibration, energy resolution measurement, and analysis of energy response functions for photon-counting detectors (PCDs). The applications can be beneficial for PCD threshold accuracy, performance verification, and optimizing image quality. In previous literature, the experimental configuration for the XRF spectrum typically employed a vertical configuration to avoid the influence of the primary X-ray beam. However, such an experimental configuration is constrained by the fixed position of the X-ray

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Wacha, András. "Optimized pinhole geometry for small-angle scattering." Journal of Applied Crystallography 48, no. 6 (2015): 1843–48. http://dx.doi.org/10.1107/s1600576715018932.

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In order to make the most of the low photon flux in laboratory small-angle X-ray scattering instruments, the experimental geometry has to be chosen carefully, with special stress on the beam-shaping system. The optimum collimation scheme should enable accurate measurements over the desired range of the scattering variable, while yielding the highest flux and the lowest possible instrumental background. In order to identify the best setting, a phase-space optimization of the collimating scheme is carried out in the present work, including constraints on the beam size at the sample position and

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Kuvvetli, Irfan, Carl Budtz-Jørgensen, Natalia Auricchio, et al. "A 3D CZT High Resolution Detector for X-and gamma-ray applications." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C683. http://dx.doi.org/10.1107/s2053273314093164.

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A high resolution three dimensional (3D) position sensitive CdZnTe-based detector was developed to detect high energy photons (10 keV-1MeV). The design of the 3D CZT detector, developed at DTU Space, is based on the CZT Drift Strip detector principle. The prototype detector contains 12 drift cells, each comprising one collecting anode strip with 3 drift strips, biased such that the electrons are focused and collected by the anode strips. The anode pitch is 1.6mm. The position determination perpendicular to the anodes, the X-direction, is performed using a novel interpolating technique. The pos

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Barnes, Michael P., and Peter B. Greer. "Evaluation of the TrueBeam machine performance check (MPC) beam constancy checks for flattened and flattening filter‐free (FFF) photon beams." Journal of Applied Clinical Medical Physics 18, no. 1 (2016): 139–50. http://dx.doi.org/10.1002/acm2.12016.

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AbstractMachine Performance Check (MPC) is an automated and integrated image‐based tool for verification of beam and geometric performance of the TrueBeam linac. The aims of the study were to evaluate the MPC beam performance tests against current daily quality assurance (QA) methods, to compare MPC performance against more accurate monthly QA tests and to test the sensitivity of MPC to changes in beam performance. The MPC beam constancy checks test the beam output, uniformity, and beam center against the user defined baseline. MPC was run daily over a period of 5 months (n = 115) in parallel

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Pritchard, J. L., J. J. Velthuis, L. Beck, et al. "Complex field verification using a large area CMOS MAPS upstream in radiotherapy." Journal of Instrumentation 17, no. 08 (2022): C08018. http://dx.doi.org/10.1088/1748-0221/17/08/c08018.

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Abstract A multileaf collimator (MLC) is an integral component in modern radiotherapy machines as it dynamically shapes the photon field used for patient treatment. Currently, the MLC leaves which collimate the treatment field are mechanically calibrated to ±1 mm every 3 months and during pre-treatment calibration are calibrated to the mechanically set leaf positions. Leaf drift can occur between calibration dates and hence exceed the ±1 mm tolerance. Pre-treatment verification, increases LINAC usage time so is seldom performed for each individual patient treatment, but instead for an acceptab

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Rossington, C., J. Jaklevic, J. Reid, C. Haber, and H. Spieler. "Evaluation of the X-ray Response of a Position-Sensitive Microstrip Detector with an Integrated Readout Chip." Advances in X-ray Analysis 34 (1990): 337–47. http://dx.doi.org/10.1154/s0376030800014646.

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Many of the scientific programs proposed for implementation at existing and future synchrotron radiation sources involve measurement of the spatial distribution of transmitted or diffracted x-ray beams. The design of a general purpose position-sensitive detector for use in such experiments must address several conflicting requirements. Ideally, such a detector would meet the following criteria: high detection efficiency over a wide energy range, large dynamic range in measured photon intensities and response to a wide range of measurement intervals. Existing detector systems only partially mee

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Georgadze, Anzori, Shivani Shivani, Keyvan Tayefi Ardebili, and Paweł Moskal. "Optimization of the WLS design for positron emission mammography and Total-Body J-PET systems." Bio-Algorithms and Med-Systems 19, no. 1 (2023): 114–23. http://dx.doi.org/10.5604/01.3001.0054.1942.

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Total-body positron emission tomography (PET) instruments are medical imaging devices that detect and visualize metabolic activity in the entire body. The PET scanner has a ring-shaped detector that surrounds the patient and detects the gamma rays emitted by the tracer as it decays. Usually these detectors are made up of scintillation crystals coupled to photodetectors that convert the light produced by the scintillation crystal into electrical signals. Jagiellonian Positron Emission Mammograph (J-PEM) is the first J-PET prototype module based on a novel idea with a plastic scintillator and wa

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Juanhuix, Jordi, Josep Nicolás, Guifré Cuní, et al. "New developments and operation of the MX beamline XALOC at ALBA synchrotron." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1744. http://dx.doi.org/10.1107/s2053273314082552.

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BL13-XALOC is a Macromolecular Crystallography beamline at the 3-GeV ALBA synchrotron near Barcelona, and is operating with users since 2012. Currently being the only MX beamline at the site, XALOC has been designed to deal not only with easily automatable x-ray diffraction experiments of medium-sized crystals, but also with more complex ones that include a variety of crystal sizes and unit-cell length dimensions, crystals with high mosaic spread, and/or poorly diffracting crystals. The aim for a reliable all-in-one beamline contrasts with the trend observed lately, i.e. MX beamlines target sp

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Bacchi, C., A. Dawiec, and F. Orsini. "Pragmatic method for fast programming of hybrid photon counting detectors." Journal of Instrumentation 17, no. 01 (2022): C01026. http://dx.doi.org/10.1088/1748-0221/17/01/c01026.

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Abstract It is now been over 15 years since Hybrid Photon Counting Detectors (HPCD) became one of the standard position-sensitive detectors for synchrotron light sources and X-ray detection applications. This is mainly due to their single-photon sensitivity over a high dynamic energy range and electronic noise suppression thanks to energy thresholding. To reach those performances, all HPCD pixels must feature the same electrical response against photons of the same energy. From the analysis of a monochromatic beam, in case of an ideal HPCD detector, it would be sufficient to apply a fixed volt

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Iramina, Hiraku, Mitsuhiro Nakamura, Yuki Miyabe, et al. "Quantification and correction of the scattered X-rays from a megavoltage photon beam to a linac-mounted kilovoltage imaging subsystem." BJR|Open 2, no. 1 (2020): 20190048. http://dx.doi.org/10.1259/bjro.20190048.

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Objective: To quantify and correct megavoltage (MV) scattered X-rays (MV-scatter) on an image acquired using a linac-mounted kilovoltage (kV) imaging subsystem. Methods and materials: A linac-mounted flat-panel detector (FPD) was used to acquire an image containing MV-scatter by activating the FPD only during MV beam irradiation. 6-, 10-, and 15 MV with a flattening-filter (FF; 6X-FF, 10X-FF, 15X-FF), and 6- and 10 MV without an FF (6X-FFF, 10X-FFF) were used. The maps were acquired by changing one of the irradiation parameters while the others remained fixed. The mean pixel values of the MV-s

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Iwamoto, Toshiyuki. "VUV-sensitive MPPC used in the liquid xenon detector for MEG II experiment." Journal of Instrumentation 20, no. 05 (2025): C05015. https://doi.org/10.1088/1748-0221/20/05/c05015.

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Abstract The MEG II experiment searches for new physics such as SUSY-GUT/SUSY-seesaw through the lepton flavor violating μ + → e + γ decay with ten times better sensitivity than the MEG experiment. The MEG experiment published the result of B(μ + → e + γ) < 4.2 × 10-13 at 90% CL. in 2016, which is thirty times better result than the previous limit. While the MEG experiment used 846 2-inch PMTs to detect scintillation light in a 900L liquid xenon gamma calorimeter, 216 2-inch PMTs on the gamma incident face are replaced with 4092 VUV-sensitive MPPCs (SiPMs manufactured by Hamamatsu) in the M

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