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Artykuły w czasopismach na temat „High-charge electron beams”

Autor: Grafiati

Data publikacji: 23 listopada 2024

Data aktualizacji: 31 lipca 2025

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1

Maitrallain, A., E. Brunetti, M. J. V. Streeter, et al. "Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator." New Journal of Physics 24, no. 1 (2022): 013017. http://dx.doi.org/10.1088/1367-2630/ac3efd.

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Abstract Laser wakefield accelerators commonly produce on-axis, low-divergence, high-energy electron beams. However, a high charge, annular shaped beam can be trapped outside the bubble and accelerated to high energies. Here we present a parametric study on the production of low-energy-spread, ultra-relativistic electron ring beams in a two-stage gas cell. Ring-shaped beams with energies higher than 750 MeV are observed simultaneously with on axis, continuously injected electrons. Often multiple ring shaped beams with different energies are produced and parametric studies to control the genera

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2

Hwang, D. M., Y. A. Tkachenko, and J. C. M. Hwang. "High-resolution charge collection microscopy with high-voltage electron beams." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 954–55. http://dx.doi.org/10.1017/s0424820100172504.

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Electron-beam-induced-current (EBIC) microscopy has the unique capability of simultaneously providing structural and transport characteristics of semiconductors. However, EBIC is traditionally performed inside an SEM with less than 40 keV electron beam energy. As the result, the applications of traditional EBIC for semiconductor device characterization are limited by either probing depth (0.02 ~0.05 μm with 2 ~5 keV electron beams) or spatial resolution (1-2 um with 20 ~40 keV electron beams). To achieve useful resolution for studying the interface effects critical to today's submicron devices

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3

DEVYATKOV, V. N., N. N. KOVAL, P. M. SCHANIN, V. P. GRIGORYEV, and T. V. KOVAL. "Generation and propagation of high-current low-energy electron beams." Laser and Particle Beams 21, no. 2 (2003): 243–48. http://dx.doi.org/10.1017/s026303460321212x.

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High-current electron beams with a current density of up to 100 A/cm2 generated by a plasma-cathode gas-filled diode at low accelerating voltages are studied. Two types of gas discharges are used to produce plasma in the cathode. With glow and arc discharges, beam currents of up to 150 A and 400 A, respectively, have been obtained at an accelerating voltage of 16 kV and at a pressure of 1–3·10−2 Pa in the acceleration gap. The ions resulting from ionization of gas molecules by electrons of the beam neutralize the beam charge. The charge-neutralized electron beam almost without losses is transp

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4

Hue, Céline S., Yang Wan, Eitan Y. Levine, and Victor Malka. "Control of electron beam current, charge, and energy spread using density downramp injection in laser wakefield accelerators." Matter and Radiation at Extremes 8, no. 2 (2023): 024401. http://dx.doi.org/10.1063/5.0126293.

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Density downramp injection has been demonstrated to be an elegant and efficient approach for generating high-quality electron beams in laser wakefield accelerators. Recent studies have demonstrated the possibilities of generating electron beams with charges ranging from tens to hundreds of picocoulombs while maintaining good beam quality. However, the plasma and laser parameters in these studies have been limited to specific ranges or attention has been focused on separate physical processes such as beam loading, which affects the uniformity of the accelerating field and thus the energy spread

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5

Niu, K., P. Mulser, and L. Drska. "Beam generations of three kinds of charged particles." Laser and Particle Beams 9, no. 1 (1991): 149–65. http://dx.doi.org/10.1017/s0263034600002391.

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Analyses are given for beam generations of three kinds of charged particles: electrons, light ions, and heavy ions. The electron beam oscillates in a dense plasma irradiated by a strong laser light. When the frequency of laser light is high and its intensity is large, the acceleration of oscillating electrons becomes large and the electrons radiate electromagnetic waves. As the reaction, the electrons feel a damping force, whose effect on oscillating electron motion is investigated first. Second, the electron beam induces the strong electromagnetic field by its self-induced electric current de

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6

Ma, Yong, Jiarui Zhao, Yifei Li, et al. "Ultrahigh-charge electron beams from laser-irradiated solid surface." Proceedings of the National Academy of Sciences 115, no. 27 (2018): 6980–85. http://dx.doi.org/10.1073/pnas.1800668115.

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Compact acceleration of a tightly collimated relativistic electron beam with high charge from a laser–plasma interaction has many unique applications. However, currently the well-known schemes, including laser wakefield acceleration from gases and vacuum laser acceleration from solids, often produce electron beams either with low charge or with large divergence angles. In this work, we report the generation of highly collimated electron beams with a divergence angle of a few degrees, nonthermal spectra peaked at the megaelectronvolt level, and extremely high charge (∼100 nC) via a powerful sub

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7

Lai, P. W., K. N. Liu, D. K. Tran, et al. "Laser wakefield acceleration of 10-MeV-scale electrons driven by 1-TW multi-cycle laser pulses in a sub-millimeter nitrogen gas cell." Physics of Plasmas 30, no. 1 (2023): 010703. http://dx.doi.org/10.1063/5.0131155.

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By focusing conventional 1-TW 40-fs laser pulses into a dense 450- μm-long nitrogen gas cell, we demonstrate the feasibility of routinely generating electron beams from laser wakefield acceleration (LWFA) with primary energies scaling up to 10 MeV and a high charge in excess of 50 pC. When electron beams are generated with a charge of ≈30 pC and a beam divergence of ≈40 mrad from the nitrogen cell having a peak atom density of [Formula: see text] cm−3, increasing the density inside the cell by 25%—controlled by tuning the backing pressure of fed nitrogen gas—can induce defocusing of the pump p

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8

Metel, Alexander, Enver Mustafaev, Yury Melnik, and Khaled Hamdy. "Generation of Electron and Fast Atom Beams by a Grid Immersed in Plasma." EPJ Web of Conferences 248 (2021): 04001. http://dx.doi.org/10.1051/epjconf/202124804001.

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We present a new method of product processing with beams of accelerated electrons and fast neutral atoms, which are generated by an immersed in plasma grid under a high negative voltage of 5 kV. The electrons appear due to secondary emission from the grid surface provoked by its bombardment with ions accelerated from the plasma. At the gas pressure not exceeding 0.1 Pa the ions with energy of 5 keV reach the grid without collisions in the space charge sheaths near its surface and their current in the grid circuit is by 2-3 times lower than the electron current. At higher pressures accelerated

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9

Lapierre, A., H. J. Son, R. Ringle, S. Schwarz, and A. C. C. Villari. "High-Current Capability and Upgrades of the EBIS/T Charge-Breeding System in the Reaccelerator at the Facility for Rare-Isotope Beams." Journal of Physics: Conference Series 2743, no. 1 (2024): 012063. http://dx.doi.org/10.1088/1742-6596/2743/1/012063.

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Abstract The Reaccelerator (ReA) of the Facility for Rare-Isotope Beams (FRIB) at Michigan State University uses a Beam Cooler/Buncher (BCB) and an Electron-Beam Ion Trap (EBIT) as a charge-breeding injector system. The rare isotopes produced by In-flight Separation are selected by the Advanced Rare Isotope Separator (ARIS) and stopped in a helium gas cell. Long-lived and stable-isotope beams can also be extracted from a Batch-Mode Ion Source (BMIS). The continuous beams transported at low energy to ReA are injected into the BCB. The pulsed beams are then injected into the EBIT, charge bred, e

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10

Son, Hyock-Jun, Alain Lapierre, Stefan Schwarz, and Antonio C. C. Villari. "Status of the High-Current Electron-Beam Ion Source Charge Breeder for the Facility for Rare-Isotope Beams." Journal of Physics: Conference Series 2743, no. 1 (2024): 012046. http://dx.doi.org/10.1088/1742-6596/2743/1/012046.

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Abstract The Reaccelerator (ReA) of the Facility for Rare-Isotope Beams (FRIB) employs an Electron-Beam Ion Trap (EBIT) as a charge breeder to reaccelerate rare-isotope beams up to 12 MeV/u. The ReA EBIT produces an electron current of 300 – 600 mA. The maximum trap capacity of the ReA EBIT is 1010 elementary charges. FRIB production rates are expected to exceed 1010 particles/s in some cases in the future. There is also a user demand for reaccelerated stable-isotope beams of more than 1010 pps. To handle these rates and provide redundancy, a High Current Electron-Beam Ion Source (HCEBIS) has

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11

Shang, Tianyi, and Weidong Ding. "Influence of gas pressure and gas type on pseudospark electron beam." Journal of Instrumentation 18, no. 09 (2023): P09045. http://dx.doi.org/10.1088/1748-0221/18/09/p09045.

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Abstract Pseudospark discharge is a discharge that occurs in the left band of the Paschen curve. According to previous studies, an electron beam will be generated in the initial stage of pseudospark discharge. This electron beam has the advantages of high energy, high current and self-confinement. It has a promising application in high-power microwave sources, surface treatment of metal materials, etc. To investigate the characteristics of this electron beam, a pseudospark discharge experimental platform is established in this paper. A pseudospark chamber is designed for pseudospark discharge.

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12

Pae, Ki Hong, Chul Min Kim, Vishwa Bandhu Pathak, Chang-Mo Ryu, and Chang Hee Nam. "Direct laser acceleration of electrons from a plasma mirror by an intense few-cycle Laguerre–Gaussian laser and its dependence on the carrier-envelope phase." Plasma Physics and Controlled Fusion 64, no. 5 (2022): 055013. http://dx.doi.org/10.1088/1361-6587/ac5a0a.

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Abstract A direct acceleration scheme to generate high-energy, high-charge electron beams with an intense few-cycle Laguerre–Gaussian (LG) laser pulse was investigated using three-dimensional particle-in-cell simulations. In this scheme, an intense LG laser pulse was irradiated onto a solid density plasma slab. When the laser pulse is reflected, electrons on the target front surface are injected into the longitudinal electric field of the laser and accelerated further. We found that the carrier-envelope phase (CEP) of the few-cycle laser pulse plays a key role in the electron injection and acc

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13

Kavar, Anjali Bhagwan, Shigeru Kashiwagi, Kai Masuda, et al. "High Average Current Electron Beam Generation Using RF Gated Thermionic Electron Gun." Particles 8, no. 3 (2025): 68. https://doi.org/10.3390/particles8030068.

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High-current electron beams can significantly enhance the productivity of variety of applications including medical radioisotope (RI) production and wastewater purification. High-power superconducting radio frequency (SRF) linacs are capable of producing such high-current electron beams due to the key advantage to operate in continuous wave (CW) mode. However, this requires an injector capable of generating electron bunches with high repetition rate and in CW mode, while minimizing beam losses to avoid damage to SRF cavities due to quenching. RF gating to the grid of a thermionic electron gun

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14

GLINEC, Y., J. FAURE, A. PUKHOV, et al. "Generation of quasi-monoenergetic electron beams using ultrashort and ultraintense laser pulses." Laser and Particle Beams 23, no. 2 (2005): 161–66. http://dx.doi.org/10.1017/s0263034605050275.

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Plasma-based accelerators have been proposed for the next generation of compact accelerators because of the huge electric fields they can support. However, it has been difficult to use them efficiently for applications because they produce poor quality particle beams with large energy spreads. Here, we demonstrate a dramatic enhancement in the quality of electron beams produced in laser-plasma interaction: an ultrashort laser pulse drives a plasma bubble which traps and accelerates plasma electrons to a single energy. This produces an extremely collimated and quasi-monoenergetic electron beam

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15

BOULWARE, C. H., J. D. JARVIS, H. L. ANDREWS, and C. A. BRAU. "NEEDLE CATHODES FOR HIGH-BRIGHTNESS BEAMS." International Journal of Modern Physics A 22, no. 22 (2007): 3784–93. http://dx.doi.org/10.1142/s0217751x07037421.

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At the tips of sharp needles, the surface electric field is enhanced by many orders of magnitude. This intensifies thermionic emission and photoemission of electrons through the Schottky effect, and reduces the effect of space charge. The increased current density improves the brightness of electron sources by orders of magnitude. In addition, at very high fields (>109 V/m ), field emission and photo-field emission produce very high current density. Arrays of needles can be used to achieve high total current.

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16

Panofski, Eva, Ralph Assmann, Florian Burkart, et al. "Commissioning Results and Electron Beam Characterization with the S-Band Photoinjector at SINBAD-ARES." Instruments 5, no. 3 (2021): 28. http://dx.doi.org/10.3390/instruments5030028.

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Over the years, the generation and acceleration of ultra-short, high quality electron beams has attracted more and more interest in accelerator science. Electron bunches with these properties are necessary to operate and test novel diagnostics and advanced high-gradient accelerating schemes, such as plasma accelerators and dielectric laser accelerators. Furthermore, several medical and industrial applications require high-brightness electron beams. The dedicated R&D facility ARES at DESY (Deutsches Elektronen-Synchrotron) will provide such probe beams in the upcoming years. After the setup

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17

ROSENZWEIG, J. B., A. M. COOK, M. DUNNING, et al. "EXPERIMENTAL TESTING OF DYNAMICALLY OPTIMIZED PHOTOELECTRON BEAMS." International Journal of Modern Physics A 22, no. 23 (2007): 4158–78. http://dx.doi.org/10.1142/s0217751x0703772x.

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We discuss the design of and initial results from an experiment in space-charge dominated beam dynamics which explores a new regime of high-brightness electron beam generation at the SPARC (located at INFN-LNF, Frascati) photoinjector. The scheme under study employs the natural tendency in intense electron beams to configure themselves to produce a uniform density, giving a nearly ideal beam from the viewpoint of space charge-induced emittance. The experiments are aimed at testing the marriage of this idea with a related concept, emittance compensation, We show that the existing infrastructure

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18

Zhao, Yuan, Haiyang Lu, Cangtao Zhou, and Jungao Zhu. "Overcritical electron acceleration and betatron radiation in the bubble-like structure formed by re-injected electrons in a tailored transverse plasma." Matter and Radiation at Extremes 8, no. 1 (2023): 014403. http://dx.doi.org/10.1063/5.0121558.

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We present a novel scheme for dense electron acceleration driven by the laser irradiation of a near-critical-density plasma. The electron reflux effect in a transversely tailored plasma is particularly enhanced in the area of peak density. We observe a bubble-like distribution of re-injected electrons, which forms a strong quasistatic electromagnetic field that can accelerate electrons longitudinally while also preserving the electron transverse emittance. Simulation results demonstrate that over-dense electrons could be trapped in such an artificial bubble and accelerated to an energy of [For

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19

Antonovich, D. A., V. A. Gruzdev, V. G. Zalesski, and P. N. Soldatenko. "Plasma source of charged particles for the formation of combined ion-electron beams." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 65, no. 3 (2020): 285–91. http://dx.doi.org/10.29235/1561-8358-2020-65-3-285-291.

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One of the ways to increase the efficiency of the implementation of ion-plasma technologies of exposure to the surfaces of various materials is partial or full compensation of the positive charge of ions in the stream or on the treated surface, for which additional emitting systems are used that create compensating electron flows in the discharge space, accelerating gap or on the processed surface. It was previously shown that for the implementation of such a compensating effect, it is possible to use plasma sources of charged particles, capable of forming beams of both signs when the polarity

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20

Nayak, B., and S. Krishnagopal. "Suppression of beam halo in an RF linac using a hollow electron beam." Laser and Particle Beams 37, no. 01 (2019): 38–48. http://dx.doi.org/10.1017/s0263034619000065.

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AbstractHigh-intensity electron linacs have severe space-charge effects that lead to the production of beam halo which degrade the beam quality. For a given charge per bunch, hollow beams have a weaker nonlinear space-charge force. In this paper, we have investigated the possibility of using hollow beam to control halo growth in linacs. We simulate the dynamics of such a beam in a 17 MeV radio frequency linac using ASTRA beam dynamics code and show that it experiences a smaller emittance growth as well as reduced beam halo. The results suggest that using a hollow beam, high charge per bunch co

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21

MUELLER, D., L. GRISHAM, I. KAGANOVICH, et al. "Multiple electron stripping of heavy ion beams." Laser and Particle Beams 20, no. 4 (2002): 551–54. http://dx.doi.org/10.1017/s0263034602204036.

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One approach being explored as a route to practical fusion energy uses heavy ion beams focused on an indirect drive target. Such beams will lose electrons while passing through background gas in the target chamber, and therefore it is necessary to assess the rate at which the charge state of the incident beam evolves on the way to the target. Accelerators designed primarily for nuclear physics or high energy physics experiments utilize ion sources that generate highly stripped ions in order to achieve high energies economically. As a result, accelerators capable of producing heavy ion beams of

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22

O'SHEA, P. G., R. A. KISHEK, M. REISER, et al. "Experiments with space-charge-dominated beams for heavy ion fusion applications." Laser and Particle Beams 20, no. 4 (2002): 599–602. http://dx.doi.org/10.1017/s0263034602204218.

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A detailed understanding of the physics of space-charge-dominated beams is vital in the design of heavy ion inertial fusion (HIF) drivers. In that regard, low-energy, high-intensity electron beams provide an excellent model system. The University of Maryland Electron Ring (UMER), currently being installed, has been designed to study the physics of space-charge-dominated beams with extreme intensity in a strong focusing lattice with dispersion. At 10 keV and 100 mA, the beam from the UMER injector has a generalized perveance as much as 0.0015, corresponding to that of proposed HIF drivers. Thou

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23

Beaudoin, B. L., J. C. T. Thangaraj, D. Edstrom, et al. "Longitudinal bunch shaping of picosecond high-charge MeV electron beams." Physics of Plasmas 23, no. 10 (2016): 103107. http://dx.doi.org/10.1063/1.4964722.

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Simmons, Robert H., and Johnny S. T. Ng. "A toroidal charge monitor for high-energy picosecond electron beams." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 575, no. 3 (2007): 334–42. http://dx.doi.org/10.1016/j.nima.2007.03.002.

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Jiang, Weihua. "A Tutorial on the One-Dimensional Theory of Electron-Beam Space-Charge Effect and Steady-State Virtual Cathode." Plasma 7, no. 1 (2024): 29–48. http://dx.doi.org/10.3390/plasma7010003.

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The space-charge effects of pulsed high-current electron beams are very important to high-power particle beam accelerators and high-power microwave devices. The related physical phenomena have been studied for decades, and a large number of informative publications can be found in numerous scientific journals over many years. This review article is aimed at systematically summarizing most of the previous findings in a logical manner. Using a normalized one-dimensional mathematical model, analytical solutions have been obtained for the space-charge-limited current of both planar diode and drift

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26

KISHEK, R. A., G. BAI, S. BERNAL, et al. "SCALED MODELS: SPACE-CHARGE DOMINATED ELECTRON STORAGE RINGS." International Journal of Modern Physics A 22, no. 22 (2007): 3838–51. http://dx.doi.org/10.1142/s0217751x07037469.

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New coherent radiation sources in the hard X-ray and Terahertz regimes promise exciting new developments in science, as previously dark areas of the spectrum are brightly illuminated. Ultra-short, ultra-bright radiation packets can probe the structure of matter, and image chemical and biological processes well beyond the present state of the art. Production of this coherent radiation, however, places an unprecedented challenge on the production and acceleration of high-quality electron beams. To deliver a nano-Coulomb of charge with an emittance of less than one micron, while transporting the

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27

Fuchs, M., G. Andonian, O. Apsimon, et al. "Plasma-based particle sources." Journal of Instrumentation 19, no. 01 (2024): T01004. http://dx.doi.org/10.1088/1748-0221/19/01/t01004.

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Abstract High-brightness particle beams generated by advanced accelerator concepts have the potential to become an essential part of future accelerator technology. In particular, high-gradient accelerators can generate and rapidly accelerate particle beams to relativistic energies. The rapid acceleration and strong confining fields can minimize irreversible detrimental effects to the beam brightness that occur at low beam energies, such as emittance growth or pulse elongation caused by space charge forces. Due to the high accelerating gradients, these novel accelerators are also significantly

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Lutz, Kolemann, and Terry Trevino. "High energy laser & systems to neutralise stellar coronal mass ejections (CME) plasma." Aeronautics and Aerospace Open Access Journal 8, no. 1 (2024): 1–9. http://dx.doi.org/10.15406/aaoaj.2024.08.00187.

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With CME plasma and shockwave travelling at 600+ km/sec, active methods such as high energy electron lasers (HEL) and mirrors are effective at making contact with ionised atoms in CME. Electrons pulsed from kW to MW laser(s) could polarise ionised atoms such as Fe16+, O7/8+, Mg, He2+,etc to fill valence pairs. As high-FIP atoms are electromagnetically trapped with a higher susceptibility from lower e- density and temperatures, CME plasma clouds can be neutralised, separated, and reduced in velocity trajectory around planet. Study outlines interactions between Electron Laser and CME plasma clou

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Sparkes, Ben M., Daniel J. Thompson, Andrew J. McCulloch, et al. "High-Coherence Electron and Ion Bunches From Laser-Cooled Atoms." Microscopy and Microanalysis 20, no. 4 (2014): 1008–14. http://dx.doi.org/10.1017/s1431927614000774.

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AbstractCold atom electron and ion sources produce electron bunches and ion beams by photoionization of laser-cooled atoms. They offer high coherence and the potential for high brightness, with applications including ultra-fast electron-diffractive imaging of dynamic processes at the nanoscale. The effective brightness of electron sources has been limited by nonlinear divergence caused by repulsive interactions between the electrons, known as the Coulomb explosion. It has been shown that electron bunches with ellipsoidal shape and uniform density distribution have linear internal Coulomb field

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Fetterman, A., D. Mihalcea, S. Benson, et al. "Photoinjector generation of high-charge magnetized beams for electron-cooling applications." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1025 (February 2022): 166051. http://dx.doi.org/10.1016/j.nima.2021.166051.

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Nassisi, V., and E. Giannico. "Characterization of high charge electron beams induced by excimer laser irradiation." Review of Scientific Instruments 70, no. 8 (1999): 3277–81. http://dx.doi.org/10.1063/1.1149904.

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Lumpkin, A. H., R. B. Feldman, B. E. Carlsten, et al. "Initial observations of high-charge, low-emittance electron beams at HIBAF." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 304, no. 1-3 (1991): 379–85. http://dx.doi.org/10.1016/0168-9002(91)90891-s.

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OZUR, G. E., D. I. PROSKUROVSKY, V. P. ROTSHTEIN, and A. B. MARKOV. "Production and application of low-energy, high-current electron beams." Laser and Particle Beams 21, no. 2 (2003): 157–74. http://dx.doi.org/10.1017/s0263034603212040.

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This article reviews experiments on the production of low-energy, high-current electron beams (LEHCEB) and their use for surface modification of materials. It is shown that electron guns with a plasma anode and an explosive emission cathode are most promising for the production of this type of beams. The problems related to the initiation of explosive emission and the production and transportation of LEHCEBs in plasma-filled diodes are considered. It has been shown that if the rise time of the accelerating voltage is comparable to or shorter than the time it takes for an ion to fly through the

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Ke, Lintong, Changhai Yu, Ke Feng, et al. "Optimization of Electron Beams Based on Plasma-Density Modulation in a Laser-Driven Wakefield Accelerator." Applied Sciences 11, no. 6 (2021): 2560. http://dx.doi.org/10.3390/app11062560.

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We demonstrate a simple but efficient way to optimize and improve the properties of laser-wakefield-accelerated electron beams (e beams) based on a controllable shock-induced density down-ramp injection that is achieved with an inserted tunable shock wave. The e beams are tunable from 400 to 800 MeV with charge ranges from 5 to 180 pC. e beams with high reproducibility (of ~95% in consecutive 100 shots) were produced in elaborate experiments with an average root- mean-square energy spread of 0.9% and an average divergence of 0.3 mrad. Three-dimensional particle-in-cell (PIC) simulations were a

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Gazis, Nick, Andrea Bignami, Emmanouil Trachanas, et al. "Simulation Dosimetry Studies for FLASH Radiation Therapy (RT) with Ultra-High Dose Rate (UHDR) Electron Beam." Quantum Beam Science 8, no. 2 (2024): 13. http://dx.doi.org/10.3390/qubs8020013.

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FLASH-radiotherapy (RT) presents great potential as an alternative to conventional radiotherapy methods in cancer treatment. In this paper, we focus on simulation studies for a linear particle accelerator injector design using the ASTRA code, which permits beam generation and particle tracking through electromagnetic fields. Space charge-dominated beams were selected with the aim of providing an optimized generated beam profile and accelerator lattice with minimized emittance. The main results of the electron beam and ultra-high dose rate (UHDR) simulation dosimetry studies are reported for th

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Romano, Francesco, Giuliana Milluzzo, Fabio Di Di Martino, et al. "First Characterization of Novel Silicon Carbide Detectors with Ultra-High Dose Rate Electron Beams for FLASH Radiotherapy." Applied Sciences 13, no. 5 (2023): 2986. http://dx.doi.org/10.3390/app13052986.

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Ultra-high dose rate (UHDR) beams for FLASH radiotherapy present significant dosimetric challenges. Although novel approaches for decreasing or correcting ion recombination in ionization chambers are being proposed, applicability of ionimetric dosimetry to UHDR beams is still under investigation. Solid-state sensors have been recently investigated as a valuable alternative for real-time measurements, especially for relative dosimetry and beam monitoring. Among them, Silicon Carbide (SiC) represents a very promising candidate, compromising between the maturity of Silicon and the robustness of d

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V. Miginky, Sergey. "An Acceptance Optimizer for High-Current Beamlines." Siberian Journal of Physics 3, no. 2 (2008): 80–87. http://dx.doi.org/10.54362/1818-7919-2008-3-2-80-87.

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A novel approach to the problem of beamlines development for high-current electron beam is put forward. An electron bunch is considered as a set of independently moving uniformly charged emittanceless slices with different currents, energies, and initial conditions. This locally cold beam model is accurate enough for space charge dominated beams if the bunch length in the center-of-mass system is much bigger than its transverse size. The model permits effective numerical maximization of the acceptance of a beamline to a beam, which parameters are known only approximately, and reliable predicti

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ROSENZWEIG, J., and O. WILLIAMS. "LIMITS ON PRODUCTION OF NARROW BAND PHOTONS FROM INVERSE COMPTON SCATTERING." International Journal of Modern Physics A 22, no. 23 (2007): 4333–42. http://dx.doi.org/10.1142/s0217751x07037871.

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In using the inverse Compton scattering (ICS) interaction as a high brilliance, short wavelength radiation source, one collides two beams, one an intense laser, and the other a high charge, short pulse electron beam. In order to maximize the flux of photons from ICS, one must focus both beams strongly, which implies both use of short beams and the existence of large angles in the interaction. One aspect of brilliance is the narrowness of the wavelength band emitted by the source. This paper explores the limits of ICS-based source brilliance based on inherent wavelength broadening effects that

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Hogan, Mark J. "Electron and Positron Beam–Driven Plasma Acceleration." Reviews of Accelerator Science and Technology 09 (January 2016): 63–83. http://dx.doi.org/10.1142/s1793626816300036.

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Particle accelerators are the ultimate microscopes. They produce high energy beams of particles — or, in some cases, generate X-ray laser pulses — to probe the fundamental particles and forces that make up the universe and to explore the building blocks of life. But it takes huge accelerators, like the Large Hadron Collider or the two-mile-long SLAC linac, to generate beams with enough energy and resolving power. If we could achieve the same thing with accelerators just a few meters long, accelerators and particle colliders could be much smaller and cheaper. Since the first theoretical work in

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Cavenaile, M., C. R. J. Charles, O. Kester, B. E. Schultz, F. Ames, and R. Kanungo. "Pulse-stretching out of the CANREB EBIS." Journal of Physics: Conference Series 2743, no. 1 (2024): 012077. http://dx.doi.org/10.1088/1742-6596/2743/1/012077.

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Abstract The CANadian Rare isotope facility with Electron-Beam ion source (CANREB) at TRIUMF is set to deliver rare isotope beams in high charge states. In the Electron Beam Ion Source (EBIS) ions are charge-bred by collisions with an electron beam of up to 500 mA. A strong magnetic field (up to 6T) maximizes the overlap between ions and electron beam and increases the breeding efficiency. Ion confinement is maintained by a combination of an electrostatic field and the electron beam space-charge potential. Ions are released by lowering the trapping potential with a step function. The system is

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Krainara, Siriwan, Shuya Chatani, Heishun Zen, Toshiteru Kii, and Hideaki Ohgaki. "Manipulation of Laser Distribution to Mitigate the Space-Charge Effect for Improving the Performance of a THz Coherent Undulator Radiation Source." Particles 1, no. 1 (2018): 238–52. http://dx.doi.org/10.3390/particles1010018.

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A THz coherent undulator radiation (THz-CUR) source has been developed at the Institute of Advanced Energy, Kyoto University. A photocathode Radio-Frequency (RF) gun and a bunch compressor chicane are used for generating short-bunch electron beams. When the electron beam energy is low, the space-charge effect strongly degrades the beam quality, such as the bunch length and the energy spread at the high bunch charge condition at around 160 pC, and results in the reduction of the highest frequency and the maximum radiated power of the THz-CUR. To mitigate the space charge effect, we have investi

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Peebles, J. L., G. Fiksel, M. R. Edwards, et al. "Magnetically collimated relativistic charge-neutral electron–positron beams from high-power lasers." Physics of Plasmas 28, no. 7 (2021): 074501. http://dx.doi.org/10.1063/5.0053557.

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Katz, I., G. A. Jongeward, D. E. Parks, David L. Reasoner, and Carolyn K. Purvis. "Energy broadening due to space-charge oscillations in high current electron beams." Geophysical Research Letters 13, no. 1 (1986): 64–67. http://dx.doi.org/10.1029/gl013i001p00064.

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Malka, V., J. Faure, Y. Glinec, and A. F. Lifschitz. "Laser–plasma accelerator: status and perspectives." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364, no. 1840 (2006): 601–10. http://dx.doi.org/10.1098/rsta.2005.1725.

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Laser–plasma accelerators deliver high-charge quasi-monoenergetic electron beams with properties of interest for many applications. Their angular divergence, limited to a few mrad, permits one to generate a small γ ray source for dense matter radiography, whereas their duration (few tens of fs) permits studies of major importance in the context of fast chemistry for example. In addition, injecting these electron beams into a longer plasma wave structure will extend their energy to the GeV range. A GeV laser-based accelerator scheme is presented; it consists of the acceleration of this electron

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SEIDL, P. A., D. BACA, F. M. BIENIOSEK, et al. "The high current experiment: First results." Laser and Particle Beams 20, no. 3 (2002): 435–40. http://dx.doi.org/10.1017/s0263034602203146.

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The High Current Experiment (HCX) is being assembled at Lawrence Berkeley National Laboratory as part of the U.S. program to explore heavy ion beam transport at a scale representative of the low-energy end of an induction linac driver for fusion energy production. The primary mission of this experiment is to investigate aperture fill factors acceptable for the transport of space-charge dominated heavy ion beams at high space-charge intensity (line-charge density ∼ 0.2 μC/m) over long pulse durations (>4 μs). This machine will test transport issues at a driver-relevant scale resulting from n

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Wang, Jia, Ming Zeng, Xiaoning Wang, Dazhang Li, and Jie Gao. "Scissor-cross ionization injection in laser wakefield accelerators." Plasma Physics and Controlled Fusion 64, no. 4 (2022): 045012. http://dx.doi.org/10.1088/1361-6587/ac4853.

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Abstract We propose to use a frequency-doubled pulse colliding with the driving pulse at an acute angle to trigger ionization injection in a laser wakefield accelerator. This scheme effectively reduces the duration of the injection; thus, high injection quality is obtained. Three-dimensional particle-in-cell simulations show that electron beams with energy of ∼ 500 MeV , a charge of ∼ 40 pC , energy spread of ∼ 1 % and normalized emittance of a few millimeter milliradian can be produced by ∼ 100 TW laser pulses. By adjusting the angle between the two pulses, the intensity of the trigger pulse

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Foster, J. C., J. W. McClory, S. B. Swanekamp, et al. "Particle-in-cell simulations of ion dynamics in a pinched-beam diode." Physics of Plasmas 29, no. 5 (2022): 053103. http://dx.doi.org/10.1063/5.0089904.

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Particle-in-cell simulations of a 1.6 MV, 800 kA, and 50 ns pinched-beam diode have been completed with emphasis placed on the quality of the ion beams produced. Simulations show the formation of multiple regions in the electron beam flow characterized by locally high charge and current density (“hot spots”). As ions flow through the electron-space-charge cloud, these hot spots electrostatically attract ions to produce a non-uniform ion current distribution. The length of the cavity extending beyond the anode-to-cathode gap (i.e., behind the cathode tip) influences both the number and amplitud

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Kim, Jongwon, Hyock-Jun Son, and Young-Ho Park. "Design for simultaneous acceleration of stable and unstable beams in a superconducting heavy-ion linear accelerator for RISP." Modern Physics Letters A 32, no. 36 (2017): 1750203. http://dx.doi.org/10.1142/s0217732317502030.

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The post-accelerator of isotope separation on-line (ISOL) system for rare isotope science project (RISP) is a superconducting linear accelerator (SC-linac) with a DC equivalent voltage of around 160 MV. An isotope beam extracted from the ISOL is in a charge state of [Formula: see text] and its charge state is increased to [Formula: see text] by charge breeding with an electron beam ion source (EBIS). The charge breeding takes tens of ms and the pulse width of extracted beam from the EBIS is tens of [Formula: see text]s, which operates at up to 30 Hz. Consequently a large portion of radio frequ

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ZIMMERMANN, F., and D. H. WHITTUM. "FINAL-FOCUS SYSTEM AND COLLISION SCHEMES FOR A 5-TeV W-BAND LINEAR COLLIDER." International Journal of Modern Physics A 13, no. 14 (1998): 2525–49. http://dx.doi.org/10.1142/s0217751x98001311.

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A 3-km long high-gradient W-band switched matrix linac may, in parallel channels, accelerate multiple electron and positron bunches to an energy of 2.5 TeV, with a tight control on the intra-bunch energy spread. In this report, we describe a final-focus system for such an accelerator, whose length is restrained by eliminating chromatic correction. The interaction point (IP) spot size is limited by synchrotron radiation in the last quadrupole (Oide effect). The energy loss due to beamstrahlung is optionally suppressed by combining bunches of opposite charge and colliding the neutral beams. We p

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Gall, Amy, Grant Mondeel, Adam Foster, Endre Takacs, Nancy Brickhouse, and Randall Smith. "Effective electron density measurement via ion emission imaging in the SAO EBIT." Journal of Instrumentation 20, no. 06 (2025): C06036. https://doi.org/10.1088/1748-0221/20/06/c06036.

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Abstract Electron beam ion traps (EBITs) are compact devices optimized for producing ions in high charge states for spectroscopic studies or as extracted beams. Key characteristics, such as current density and electron-ion overlap, govern ionization and excitation rates. Using visible and X-ray imaging of emissions from highly charged ions, the spatial distributions of the electron beam and ion cloud in the Smithsonian Astrophysical Observatory (SAO) EBIT were measured, enabling the determination of the effective electron density. The nominal electron beam full width at half maximum (FWHM) was

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