Keyword: vacuum
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TUXZO03 Angular Distribution Measurement of Atoms Evaporated from a Resistive Oven Applied to Ion Beam Production experiment, simulation, 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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WEXZO02 39Ar Enrichment System Based on a 2.45 GHz ECR Ion Source ion-source, ECR, target, experiment 128
 
  • Z.H. Jia, X. Fang, Y.H. Guo, Q. Hu, Y.J. Li, Y.G. Liu, L.T. Sun, Q. Wu, Y. Yang, T.X. Zhan, J.Q. Zhang
    IMP/CAS, Lanzhou, People’s Republic of China
  • W. Jiang
    HNLPSM, Hefei, People’s Republic of China
  • Z.T. Lu
    USTC, SNST, Anhui, People’s Republic of China
 
  Funding: National Key Research and Development Project (contract No.2016YFA0302202).
Aimed at improving the ATTA’s (Atom Trap Trace Analysis) dating efficiency with 39Ar radioactive isotope, an isotope enrichment system has been developed at IMP (Institute of Modern Physics) to increase the abundance of 39Ar in the incident sample gas. In this enrichment system, a 2.45 GHz ECR ion source was designed to ionize sample gas and produce isotopes beams with several mA, and the isotopes beam is transported and separated in the separation beam line, which is consisted of two quadrupoles and an analysis magnet. The separated isotopes are collected by a rotated aluminum foil target. According to the recent cross-checked results with ATTA, high enrichment factor of 39Ar isotope has been successfully reached. This paper will give a general introduction to the platform setup. The isotope enrichment efficiency is the critical issue for such a platform and will be specially discussed.
 
slides icon Slides WEXZO02 [1.799 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEXZO02  
About • Received ※ 29 September 2020 — Revised ※ 21 December 2020 — Accepted ※ 14 February 2021 — Issue date ※ 21 July 2021
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WEZZO02 Contaminants Reduction in ECR Charge Breeders by LNL LPSC GANIL Collaboration plasma, ECR, injection, extraction 151
 
  • J. Angot, M.A. Baylac, M. Migliore, P. Sole, T. Thuillier
    LPSC, Grenoble Cedex, France
  • A. Galatà
    INFN/LNL, Legnaro (PD), Italy
  • L. Maunoury
    GANIL, Caen, France
 
  Contaminants reduction in Electron Cyclotron Resonance Charge Breeders (ECRCB) is a key point for the future experiments foreseen at LNL and GANIL Isotope Separation On Line (ISOL) facilities. According to the mass separator resolution set downstream the ECRCB, the radioactive ion beam study can be challenged in case of low production rate. An ongoing collaboration between LNL, LPSC and GANIL laboratories aims to improve the beam purity, acting on all the pollutant causes. Comparative experiments will be done at LPSC using different techniques, like covering the plasma chamber wall with liners of different materials. Different configurations of the ECRCB will also be tested, with the enhancement of the efficiency and charge breeding time parameters as additional objectives. A presentation of this program is proposed together with the recent upgrade of the LPSC 1+N+ test bench, with the aim to improve the vacuum quality.  
slides icon Slides WEZZO02 [1.915 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO02  
About • Received ※ 29 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 15 October 2020 — Issue date ※ 04 November 2020
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NACB01 Development of a Compact Linear ZAO NEG Pumping System injection, operation, cathode, detector 167
 
  • S.A. Kondrashev, E.N. Beebe, B.D. Coe, J. Ritter, T. Rodowicz, R. Schoepfer, S.M. Trabocchi
    BNL, Upton, New York, USA
 
  Funding: This work was supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration.
An upgrade of RHIC EBIS, the extended EBIS, is presently under development at Brookhaven National Laboratory to increase the intensity of the Au32+ ion beams by 40%’50% to 2.1 ’ 109 Au32+ ions/pulse at the booster ring entrance. Generation of intense beams of polarized 3He2+ ions with up to ~ 5 ’ 1011 ions/pulse for the RHIC and the future electron’ion collider is a goal of the EBIS upgrade project as well. Ultra-high vacuum is extremely important for stable and reliable operation of EBIS/T devices. We have developed a linear pumping module based on the ZAO NEG unit commercially available from SAES Getters. This pumping system will be used for the Extended EBIS Upgrade which is presently under development at BNL. A ZAO NEG module has been modified to be heated up to 600 °C by passing up to 120 A of DC current through a stainless-steel cage for required NEG activation and reactivation temperature cycles. A method of pumping speed measurements using pulsed gas injection into the vacuum chamber has been developed and used for characterization of the ZAO NEG-based linear pumping system.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB01  
About • Received ※ 29 September 2020 — Revised ※ 30 September 2020 — Accepted ※ 21 October 2020 — Issue date ※ 16 April 2021
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