Log in

Relevant bibliographies by topics / Radio Frequency Quadrupole (RFQ) / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Radio Frequency Quadrupole (RFQ).

Dissertations / Theses on the topic 'Radio Frequency Quadrupole (RFQ)'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 21 dissertations / theses for your research on the topic 'Radio Frequency Quadrupole (RFQ).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Pratt, Devin Baker. "Array Analysis of Radio Frequency Interference Cancelation Requirements for a Land Mine Detection System." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1090.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gulick, Sidney Luther. "Ion injection into radio frequency quadrupole field devices." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66038.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Sieber, Thomas. "Entwicklung von 4-Rod- und IH-Radio-Frequenz-Quadrupol-(RFQ)-Beschleunigern für radioaktive Ionenstrahlen bei REX-ISOLDE und MAFF." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963254863.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Sieber, Thomas. "Entwicklung von 4-Rod- und IH- Radio-Frequenz-Quadrupol (RFQ)-Beschleunigern für radioaktive Ionenstrahlen bei REX-ISOLDE und MAFF." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-4557.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Lambo, Ricardo. "An electrostatic decelerator for a high-field radio-frequency quadrupole ion guide beam cooler /." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98743.

Full text

Abstract:

An electrostatic decelerator system capable of bringing to rest a continuous 60 keV DC ion-beam was developed and tested as to its suitability as the first part of a high-performance RFQ buffer gas beam cooler. The decelerator is intended to decelerate high-energy ions for injection into an RFQ ion-guide capable of producing bunches of ions at a repetition rate up to 100 Hz. Simulations of the ion motion through the decelerator and into the guide were made to test the design, and the decelerator was then constructed following the parameters used in the simulations. Although problems, such as sparking between the electrode surfaces of the decelerator, prevented it from being operated at potentials high enough to decelerate a 60 keV beam, its implementation proved, as in the simulations, that high-energy ions could indeed be decelerated to energies that would allow for their injection into an RFQ ion-guide by this design.

APA, Harvard, Vancouver, ISO, and other styles

6

Blomeley, Laura Gail. "First tests of a square wave radio frequency quadrupole cooler and buncher for TITAN." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100773.

Full text

Abstract:

A high frequency, large amplitude helium filled RFQ (Radio Frequency Quadrupole) beam cooler and buncher was developed and tested for use in the TITAN (TRIUMF's Ion Trap for Atomic and Nuclear science) Penning trap mass spectrometer facility. This device will cool and bunch radioactive ion beams for use in TITAN's high precision mass measurements of short-lived isotopes and other experiments. A test stand was built to test the transmission and properties of ions from a surface ion source through injection optics, the linear Paul trap RFQ and the extraction optics in both continuous and pulsed modes. The efficiency of the device was determined to be on the order of 60% in continuous mode. The present measurements confirm a transverse emittance of the extracted beam in bunched mode operation of 4 pi-mm-mrad at an extraction energy of 4 keV.

APA, Harvard, Vancouver, ISO, and other styles

7

Gueye, Serigne Bira. "Electron-Radio-Frequency Quadrupole (ERFQ) linear accelerator: theory, design and measurements for the GHz region." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980255554.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Boudreau, Chantal. "The transport of radioactive ions in a gas filled radio frequency quadrupole mass filter system /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32979.

Full text

Abstract:

The technique of ion transfer in radio frequency quadrupole (RFQ) systems is described. Computer simulations of the gas filled RFQ mass filter system located at Argonne National Laboratory (ANL) in Argonne, Il. are performed and compared to data obtained from the transfer of radioactive ions produced from the fragmentation of an off-line 252Cf fission source put before the system. The device is used to transport radionuclides created in on-line fusion evaporation reactions from a 150 torr helium filled gas cell to a high vacuum mass spectrometer. Operation parameters and performance results for the gas filled RFQ mass filter system are presented. In addition, the first on-line transfer of a radioisotope resulting in a precise mass measurement using the Canadian Penning Trap (CPT) mass spectrometer is discussed.

APA, Harvard, Vancouver, ISO, and other styles

9

Babcock, Carla. "Collinear laser spectroscopy of manganese isotopes using the radio frequency quadrupole cooler and buncher at ISOLDE." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/3000461/.

Full text

Abstract:

The hyperfine structure of the odd-even ⁵¹⁻⁶³Mn isotopes (N = 26 - 38) were measured using bunched beam collinear laser spectroscopy with the COLLAPS experimental setup at ISOLDE, CERN. The properties of these nuclei were investigated over the course of two experiments. During the first experiment, nuclear spins and magnetic dipole moments were extacted from spectroscopy on manganese atoms. These nuclear properties were then compared to the predictions of two large-scale shell model effective interactions (GXPF1A [1, 2] and LNPS [3]) which use different model spaces. In the case of 61,63Mn, these results show the increasing importance of neutron excitations across the proposed N = 40 subshell closure, and of proton excitations across the Z = 28 shell gap. These measurements provide the first direct proof that proton and neutron excitations across shell gaps are playing an important role in the ground state wave functions of the neutron-rich Mn isotopes. The electric quadrupole moment provides complementary information to the magnetic dipole moment, since it is able to directly probe the degree of collectivity and deformation in a nucleus, however sensitivity limitations during the first experiment prevented the quadrupole moments from being accurately determined. To overcome these limitations, it was necessary to find an electronic transition with sensitivity to the quadrupole interaction. A suitable transition was found in the ion from a metastable state and optical pumping in ISOLDE's cooler and buncher, ISCOOL, was used to populate this state for the second manganese experiment. This is the first use of the in-cooler optical pumping technique at ISOLDE, and required an overhaul of ISCOOL. During the second experiment, the spectroscopic quadrupole moments of the isotopes were extracted from the measured hyperfine spectra of manganese ions. The sensitivity and spectroscopic efficiency were increased as compared to the atomic experiment. The extracted quadrupole moments were again compared to predictions from the GXPF1A and LNPS effective interactions. The inclusion of the 1 vgg/2 and 2 vd5/2 orbitals in the model space were shown to be necessary to reproduce the experimentally observed onset of quadrupole deformation.

APA, Harvard, Vancouver, ISO, and other styles

10

Podadera, Aliseda Ivan. "New developments on preparation of cooled and bunched radioactive ion beams at ISOL-Facilities: the ISCOOL project and the rotating wall cooling." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6619.

Full text

Abstract:

Last years have become very productive for the research, construction and development of new facilities devoted to the production of beams with exotic radioisotopes (Radioactive Ion Beams, RIB). These beams are later used for experiments in fields like nuclear physics, atomic physics, astrophysics or medicine, among others. Within this kind of facilities, the ISOL facilities stand out. They are based on the on-line separation of radioactive isotopes produced in nuclear reactions between a target and a high-energy proton beam. The ISOL method was the pioneer for these facilities and it has kept up to now the leadership of RIB facilities. The main reason is ISOLDE, an ISOL facility located at CERN, the largest accelerator complex in the world, where this doctoral thesis has been carried out.
The first innovation which is described is the design of an ion trap for the cooling and bunching of RIB's for ISOLDE, the so-called ISCOOL (ISOLDE COOLer). It is an Radio Frequency Quadrupole ion Cooler and Buncher (RFQCB), device based on the Paul traps. In these traps, the ions are confined in the three dimensions by electric fields. The ions are confined on the transverse plane with the pseudopotential well created by the Radio Frequency Quadrupole (RFQ) and focused on the longitudinal axis. At the same time, a gas (normally helium) fills the chamber with a pressure between 10-3 and 10-2 mbar. The collisions between the atoms or molecules of the gas and the ions. In addition, to drive the ions to the extraction of the RFQCB, an axial electric field is created by segmented electrodes. Different voltages are applied to these electrodes in order to choose the shape of the field. The shape can be chosen to create a potential well close to the extraction from the RFQCB in which the ions are accumulated and extracted as bunches, by the fast-switch of the voltages applied to the axial electrodes.
The new ISCOOL will be installed as a permanent device of the ISOLDE beam lines.

APA, Harvard, Vancouver, ISO, and other styles

11

Kellerbauer, Alban. "Production of a cooled ion beam by manipulation of 60-keV ions into a radio-frequency quadrupole ion guide." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0025/MQ50804.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Kim, Taewhan. "Buffer gas cooling of ions in a radio frequency quadrupole ion guide, a study of the cooling process and cooled beam properties." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0021/NQ44656.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Kim, Taeman. "Buffer gas cooling of ions in a radio frequency quadrupole ion guide : a study of the cooling process and cooled beam properties." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35666.

Full text

Abstract:

The buffer gas cooling process and the properties of the cooled beam in a novel rf quadrupole ion beam guide with axial field was studied. The operation principle of the axial field quadrupole ion beam guide is similar to the quadrupole mass filter operating in AC only mode but the rods were segmented and differential DC biases were applied to produce the axial field. It was operated in buffer gas.
A Monte Carlo simulation was developed and the simulation results were compared with the experimental results. The beam distribution in a thermal equilibrium was assumed as the thermal equilibrium distribution in a simple harmonic motion with rf distortion and the assumption was confirmed by the Monte Carlo simulation.
The temperature of the cooled beam was measured with a beam profile, measurement system which consists of a miniature quadrupole ion beam guide aid a rotating semi-circular Faraday plate. The temperature of the cooled beam was measured to be 0.0424 +/- 0.0026 eV in the experiment while that of the simulated beam was 0.0372 +/- 0.0009 eV. The variation of beam temperature with beam current was 0.0153 +/- 0.0026 eV/nA. The maximum achieved ion transmission was 80%. The transmitted ion beam's energy spread was measured with a retarding potential energy analyzer to be less than 0.1 eV. The cooling time was 0.7 ms with 1V/ cm axial field and was observed to be very dependent on the ion current when there was no axial field.

APA, Harvard, Vancouver, ISO, and other styles

14

Schmidt, Janet Susan [Verfasser], Alwin [Akademischer Betreuer] Schempp, and Oliver [Akademischer Betreuer] Kester. "Tuning and optimization of the field distribution for 4-Rod Radio Frequency Quadrupole Linacs / Janet Susan Schmidt. Gutachter: Alwin Schempp ; Oliver Kester. Betreuer: Alwin Schempp." Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2014. http://d-nb.info/1054399670/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Beyer, Thomas [Verfasser], and Klaus [Akademischer Betreuer] Blaum. "Installation and operation of a radio-frequency quadrupole cooler and buncher and offline-commissioning of the TRIGA-SPEC ion beam preparation transfer line / Thomas Beyer ; Betreuer: Klaus Blaum." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180300629/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Dixit, Kavita P. "Design Studies, Modelling And Testing The RF Characteristics Of The Radio Frequency Quadrupole Accelerator." Thesis, 1997. https://etd.iisc.ac.in/handle/2005/1817.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Dixit, Kavita P. "Design Studies, Modelling And Testing The RF Characteristics Of The Radio Frequency Quadrupole Accelerator." Thesis, 1997. http://etd.iisc.ernet.in/handle/2005/1817.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Eliades, John Alexander. "A Radio Frequency Quadrupole Instrument for use with Accelerator Mass Spectrometry: Application to Low Kinetic Energy Reactive Isobar Suppression and Gas–phase Anion Reaction Studies." Thesis, 2012. http://hdl.handle.net/1807/32706.

Full text

Abstract:

A radio frequency (rf) quadrupole instrument, currently known as an Isobar Separator for Anions (ISA), has been integrated into an Accelerator Mass Spectrometry (AMS) system to facilitate anion–gas reactions before the tandem accelerator. An AMS Cs+ sputter source provided > 15 keV ions that were decelerated in the prototype ISA to < 20 eV for reaction in a single collision cell and re-accelerated for AMS analysis. Reaction based isobar suppression capabilities were assessed for smaller AMS systems and a new technique for gas–phase reaction studies was developed. Isobar suppression of 36S– and 12C3– for 36Cl analysis, and YF3– and ZrF3– for 90Sr analysis were studied in NO2 with deceleration to < 12 eV. Observed attenuation cross sections, σ [x 10^–15 cm^2], were σ(S– + NO2) = 6.6, σ(C3– + NO2) = 4.2, σ(YF3– + NO2) = 7.6, σ(ZrF3– + NO2) = 19. With 8 mTorr NO2, relative attenuations of S–/Cl– ~ 10^–6, C3–/Cl– ~ 10^–7, YF3–/SrF3– ~ 5 x 10^–5 and ZrF3–/SrF3– ~ 4 x 10^–6 were observed with Cl– ~ 30% and SrF3– > 90% transmission. Current isobar attenuation limits with < 1.75 MV accelerator terminal voltage and ppm impurity levels were calculated to be 36S–/Cl– ~ 4 x 10^–16, 12C3–/Cl– ~ 1.2 x 10^–16, 90YF3–/SrF3– ~ 10^–15 and 90ZrF3–/SrF3– ~ 10^–16. Using 1.75 MV, four 36Cl reference standards in the range 4 x 10^–13 < 36Cl/Cl < 4 x 10^–11 were analyzed with 8 mTorr NO2. The measured 36Cl/Cl ratios plotted very well against the accepted values. A sample impurity content S/Cl < 6 x 10^–5 was measured and a background level of 36S–/Cl < 9 x 10^–15 was determined. Useful currents of a wide variety of anions are produced in AMS sputter sources and molecules can be identified relatively unambiguously by stripping fragments from tandem accelerators. Reactions involving YF3–, ZrF3–, S– and SO– + NO2 in the ISA analyzed by AMS are described, and some interesting reactants are identified.

APA, Harvard, Vancouver, ISO, and other styles

19

Syka, John E. P. "A hybrid radio frequency quadrupole linear ion trap-fourier transform ion cyclotron resonance mass spectrometer /." 2006. http://wwwlib.umi.com/dissertations/fullcit/3198419.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Sieber, Thomas [Verfasser]. "Entwicklung von 4-Rod- und IH-Radio-Frequenz-Quadrupol-(RFQ)-Beschleunigern für radioaktive Ionenstrahlen bei REX-ISOLDE und MAFF / vorgelegt von Thomas Sieber." 2001. http://d-nb.info/963254863/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Gueye, Serigne Bira [Verfasser]. "Electron-Radio-Frequency Quadrupole (ERFQ) linear accelerator: theory, design and measurements for the GHz region / vorgelegt von Serigne Bira Gueye." 2006. http://d-nb.info/980255554/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!