Keyword: cathode
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NACB01 Development of a Compact Linear ZAO NEG Pumping System vacuum, injection, operation, 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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NACB02 Status of the High-Current EBIS Charge Breeder for the Facility for Rare Isotope Beams electron, simulation, 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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