Keyword: simulation
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TUXZO03 Angular Distribution Measurement of Atoms Evaporated from a Resistive Oven Applied to Ion Beam Production experiment, vacuum, ECR, extraction 72
 
  • T. Thuillier, A. Leduc
    LPSC, Grenoble Cedex, France
  • O. Bajeat, A. Leduc, L. Maunoury
    GANIL, Caen, France
 
  A low temperature oven has been developed to produce calcium beam with Electron Cyclotron Resonance Ion Source. The atom flux from the oven has been studied experimentally as a function of the temperature and the angle of emission by means of a quartz microbalance. The absolute flux measurement permitted to derive Antoine’s coefficient for the calcium sample used : A=8.98± 0.07 and B=7787± 110 in standard unit. The angular FWHM of the atom flux distribution is found to be 53.7±7.3 °at 848K. The atom flux hysteresis observed experimentally in several laboratories is explained as follows: at first calcium heating, the evaporation comes from the sample only resulting in a small evaporation rate. once a full calcium layer has formed on the crucible refractory wall, the caclcium evaporation surface includes the crucible’s enhancing dramatically the evaporation rate for a givent temperature. A Monte-Carlo code, developed to reproduce and investigate the oven behaviour as a function of temperature is presented. A discussion on the gas regime in the oven is proposed as a function of its temperature. A fair agreement between experiment and simulation is found.  
slides icon Slides TUXZO03 [4.542 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUXZO03  
About • Received ※ 28 September 2020 — Revised ※ 19 February 2021 — Accepted ※ 21 July 2021 — Issue date ※ 16 April 2022
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TUZZO06 Beams with Three-Fold Rotational Symmetry: A Theoretical Study ECR, ion-source, solenoid, dipole 110
 
  • C.Y. Wong
    ORNL, Oak Ridge, Tennessee, USA
  • S.M. Lund
    FRIB, East Lansing, Michigan, USA
 
  Beams from ECR ion sources have 3-fold transverse rotational symmetry induced by the ECR sextupole. The symmetry imposes equality constraints among transverse beam moments, which can be derived using a theoretical framework we developed. Since the constraints are solely a consequence of the rotational symmetry of external fields, they hold for a multi-species beam with arbitrary composition and space charge intensity. These constraints provide a new tool to analyze phase space properties of ECR beams and their impact on low-energy transport. We prove that, regardless of their triangulated spatial density profile, beams with 3-fold rotational symmetry have the same RMS emittance and Twiss parameters along any transverse direction. These counter-intuitive results are applied to the FRIB Front End to show how symmetry arguments challenge long-standing assumptions and bring clarity to the beam dynamics.  
slides icon Slides TUZZO06 [0.846 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO06  
About • Received ※ 28 September 2020 — Revised ※ 14 May 2021 — Accepted ※ 18 May 2021 — Issue date ※ 03 November 2021
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WEXZO03 Conceptual Design of an Electrostatic Trap for High Intensity Pulsed Beam electron, ECR, ion-source, extraction 132
 
  • W. Huang, Y.G. Liu, L.T. Sun, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
  • L.T. Sun
    UCAS, Beijing, People’s Republic of China
  • D.Z. Xie
    LBNL, Berkeley, California, USA
 
  Funding: China Scholarship Council (CSC) (No. 201904910324)
Highly charged ion sources play an important role in the advancement of heavy ion accelerators worldwide. The beam requirements of highly charged heavy ions from new accelerators have driven the performance of ion sources to their limits and beyond. In parallel to developing new technologies to enhance the performance of ECR ion source, this paper presents a conceptual design of an ion trap aiming to convert a cw ion beam into a short beam pulse with high compression ratios. With an electron gun, a solenoid and a set of drift tubes, the injected ions will be trapped radially and axially. By manipulating the potential of drift tubes, ions can be accumulated with multiple injections and extracted at a fast or slow scheme. This paper presents the simulation and design results of this ion trap prototype.
 
slides icon Slides WEXZO03 [0.910 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEXZO03  
About • Received ※ 21 September 2020 — Revised ※ 01 January 2021 — Accepted ※ 14 April 2021 — Issue date ※ 14 July 2022
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WEZZO01 Role of the 1+ Beam Optics Upstream the SPIRAL1 Charge Breeder optics, plasma, quadrupole, dipole 146
 
  • L. Maunoury, S. Damoy, M. Dubois, R. Frigot, S. Hormigos, B. Jacquot, O. Kamalou
    GANIL, Caen, France
 
  The SPIRAL1 charge breeder (SP1CB) is under opera-tion. Radioactive ion beam (RIB) has already been deliv-ered [1] to Physicist for experiments. Charge breeding efficiencies demonstrated high performances for stable ion beams than RIB’s. The beam optics, prior to the injection of the 1+ ions into the SP1CB, is of prime im-portance [2] for obtaining such high efficiencies. Moreo-ver, the intensities of the RIB’s are so low, and indeed difficult to tune the SP1CB. A stable beam having a close B’ is required to find out the set of optic parameters preceding the tuning of the RIB. Hence, it has been de-cided to focus our effort on the control of 1+ beam optics leading to high charge breeding efficiencies whatever the 1+ mass, energy and Target Ion Source System (TISS) used. This contribution will show the strategy undertaken to overcome that problem and the results obtained.
[1] L. Maunoury et al., Proceedings of the 23th Int. Workshop on ECR Ion Sources, Catania, Italy (2018)
[2] A. Annaluru, PhD thesis, Université Caen Normandie (2019)
 
slides icon Slides WEZZO01 [4.375 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO01  
About • Received ※ 29 September 2020 — Revised ※ 09 October 2020 — Accepted ※ 03 December 2020 — Issue date ※ 21 January 2021
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WEZZO04 Improvement of the Efficiency of the TRIUMF Charge State Booster (CSB) extraction, booster, ECR, ECRIS 160
 
  • J.A. Adegun, F. Ames, O.K. Kester
    TRIUMF, Vancouver, Canada
 
  Funding: TRIUMF, Vancouver, BC Canada 4004 Wesbrook Mall, Vancouver BC V6T2A3, Canada
The Electron Cyclotron Resonance Ion Source (ECRIS) is a versatile and reliable ion source to charge-breed rare isotopes at the TRIUMF’s Isotopes Separation and Acceleration (ISAC) facility. Significant research work has been done by different groups worldwide to improve the efficiency and performance of the ECRIS. The most recent result of these activities is the implementation of the two-frequency plasma heating. At the ISAC facility of TRIUMF, a 14.5 GHz PHOENIX booster which has been in operation since 2010 was recently upgraded to accommodate the two-frequency heating system using a single waveguide to improve its charge breeding efficiency. Besides, a program has been launched to improve and optimize the extraction of charge bred isotopes in terms of beam emittance. A detailed investigation of the effect of the two-frequency heating technique on the intensity, emittance, and the efficiency of the extracted beam is presently being conducted and the status will be presented.
 
slides icon Slides WEZZO04 [0.978 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO04  
About • Received ※ 25 September 2020 — Revised ※ 29 September 2020 — Accepted ※ 17 December 2020 — Issue date ※ 04 February 2021
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NACB02 Status of the High-Current EBIS Charge Breeder for the Facility for Rare Isotope Beams electron, cathode, gun, space-charge 172
 
  • H.J. Son, A.I. Henriques, C. Knowles, A.C.C. Villari
    FRIB, East Lansing, Michigan, USA
  • E.N. Beebe
    BNL, Upton, New York, USA
  • D.B. Crisp, A. Lapierre, S. Nash
    NSCL, East Lansing, Michigan, USA
 
  Funding: work supported by the National Science Foundation under Grant No. PHY-1565546
The ReA post-accelerator of the National Supercon-ducting Cyclotron Laboratory (NSCL) at Michigan State University includes an Electron-Beam Ion Trap (EBIT) operating as a charge breeder. The Facility for Rare Iso-tope Beams (FRIB) is being implemented. After comple-tion, rare-isotopes beam rates are expected to exceed in some case 10<sup>10</sup> particles per second (pps). The charge capacity of the ReA EBIT is insufficient to handle those rates. Therefore, parts of the TEST EBIS from the Brookhaven National Laboratory (BNL) were transferred to the NSCL to build a High-Current Electron-Beam Ion Source (HCEBIS). The HCEBIS features an electron gun that can provide a current up to 4 A for an estimated trap charge capacity of 10<sup>11</sup> elementary charges. This paper presents the HCEBIS specifications, electron-beam cur-rent measurements to test its cathode, and simulation results for its implementation in the ReA post-accelerator. It also presents charge-capacity measurements conducted with the ReA EBIT that demonstrate that the HCEBIS will be able to handle beam rates of more than 10<sup>10</sup> pps.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB02  
About • Received ※ 30 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 30 November 2020 — Issue date ※ 13 March 2021
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NACB03 Determining the Fraction of Extracted 3He in the 3He2+ Charge State acceleration, electron, collider, rfq 177
 
  • M.K. Gronert, E.N. Beebe
    BNL, Upton, New York, USA
  • M.K. Gronert
    Drew University, Madison, New Jersey, USA
 
  Funding: Work supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration
The parameter space of the TOF was explored using analytic methods as well as computer simulation to improve the design and functionality of a similar device that was constructed as a prototype for the Electron Beam Ion Source (EBIS) in 2019. A simulation of the beam line optics was produced in Opera-2D CAD software to show that other optical elements would not materially affect the operation of the TOF. This will allow for true measurements of the charge state ratios of helium for EBIS and extended EBIS operation in support of the Electron Ion Collider. EBIS operators will use the device to maximize the fraction of 3He ions in the 3He2+ state. Different geometries were explored as well to maximize the effectiveness of the device and to meet the performance criterion and physical constraints of the EBIS beam line.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB03  
About • Received ※ 14 October 2020 — Revised ※ 29 October 2020 — Accepted ※ 19 May 2021 — Issue date ※ 19 July 2021
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NACB04 Ion Simulations, Recent Upgrades and Tests with Titan’s Cooler Penning Trap electron, plasma, extraction, injection 181
 
  • R. Silwal, J. Dilling, B.A. Kootte, A.A. Kwiatkowski, S.F. Paul
    TRIUMF, Vancouver, Canada
  • J. Dilling
    UBC & TRIUMF, Vancouver, British Columbia, Canada
  • G. Gwinner, B.A. Kootte
    University of Manitoba, Manitoba, Canada
  • R. Simpson
    UW/Physics, Waterloo, Ontario, Canada
 
  TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) facility has the only on-line mass measurement Penning trap (MPET) at a radioactive beam facility that uses an electron beam ion trap (EBIT) to enhance mass precision and resolution. EBITs can charge breed exotic isotopes, making them highly charged, thereby improving the precision of atomic mass measurement as the precision scales linearly with the charge state. However, ion bunches charge bred in the EBIT can have larger energy spread, which poses challenges for mass measurements. A cooler Penning trap (CPET) is currently being developed off-line at TITAN to sympathetically cool the highly charged ions (HCI) with a co-trapped electron plasma, prior to their transport to the MPET. To evaluate the integration of the CPET into the TITAN beamline and to optimize the beam transport, ion trajectory simulations were performed. Hardware upgrades motivated by these simulations and previous test measurements were applied to the off-line CPET setup. Ions and electrons were co-trapped for the first time with the CPET. Progress and challenges on the path towards HCI cooling and integration with the on-line beam facility are presented  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB04  
About • Received ※ 17 October 2020 — Revised ※ 23 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 07 February 2021
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