Author: Wang, E.
Paper Title Page
WECOXBS02 High Current Performance of Alkali Antimonide Photocathode in LEReC DC Gun 61
 
  • M. Gaowei, J. Cen, A.V. Fedotov, D. Kayran, D. Lehn, C.J. Liaw, T. Rao, J.E. Tuozzolo, J. Walsh, E. Wang
    BNL, Upton, New York, USA
 
  The bi-alkali antimonide photocathode are chosen as the electron source material for the Low Energy RHIC electron Cooling (LEReC) project at RHIC, BNL based on its requirement for high bunch charge and long-time beam operation. This report presents the design and operation of the cathode deposition and transportation systems for the LEReC photocathodes, the cathode performance under the high current operation in the LEReC DC gun, as well as the characterization of the damaged cathodes from the long-time operation.  
slides icon Slides WECOXBS02 [2.804 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WECOXBS02  
About • paper received ※ 17 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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THCOYBS02 High Charge High Current Beam From BNL 113 MHz SRF Gun 145
 
  • I. Pinayev, I. Ben-Zvi, J.C. Brutus, M. Gaowei, T. Hayes, Y.C. Jing, V. Litvinenko, J. Ma, K. Mihara, G. Narayan, I. Petrushina, F. Severino, K. Shih, J. Skaritka, E. Wang, G. Wang, Y.H. Wu
    BNL, Upton, New York, USA
  • V. Litvinenko
    Stony Brook University, Stony Brook, USA
  • I. Petrushina, Y.H. Wu
    SUNY SB, Stony Brook, New York, USA
  • K. Shih
    SBU, Stony Brook, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The 113 MHz superconducting gun is used an electron source for the coherent electron cooling experiment. The unique feature of the gun is that a photocathode is held at room temperature. It allowed to preserve the quantum efficiency of Cs2KSb cathode which is adversely affected by cryogenic temperatures. Relatively low frequency permitted fully realize the accelerating field gradient what in turn helps to achieve 10 nC charge and 0.3 microns normalized emittance. We present the achieved performance and operational experience as well.
 
slides icon Slides THCOYBS02 [4.350 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-THCOYBS02  
About • paper received ※ 03 September 2019       paper accepted ※ 08 July 2020       issue date ※ 24 June 2020  
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FRCOWBS03
Beam Commissioning Experience at Low Energy RHIC Electron Cooler (LEReC)  
 
  • D. Kayran, Z. Altinbas, K.A. Drees, A.V. Fedotov, M. Gaowei, X. Gu, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, Y.C. Jing, J. Kewisch, C. Liu, J. Ma, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, I. Pinayev, V. Ptitsyn, V. Schoefer, S. Seletskiy, F. Severino, A. Sukhanov, P. Thieberger, J.E. Tuozzolo, E. Wang, G. Wang, H. Zhao, Z. Zhao
    BNL, Upton, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The high-current high-brightness electron accelerator for cooling of RHIC ions at low energy (LEReC) was successfully commissioned at BNL. A beam quality suitable for electron cooling has been achieved. Cooling of single ion bunches in RHIC using a new approach of bunched-beam electron cooling was demonstrated during 2019. To achieve such a cooling with non-magnetized electron beams and RF acceleration required proper beam manipulation in the longitudinal phase space while preserving transverse emittances. Electron beam with kinetic energy of 1.6 MeV with beam quality suitable for cooling was successfully propagated through 100 meters of beam lines including dispersion sections and maintained through both cooling sections in RHIC. The LEReC accelerator includes a photocathode DC gun, a laser system, a photocathode delivery system, magnets, beam diagnostics, a SRF booster cavity, and a set of Normal Conducting RF cavities to provide sufficient flexibility to tune the beam in the longitudinal phase space. In this paper we discuss experience learned during LEReC beam commissioning.
 
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FRCOYBS03
Working Group Summary: Electron Sources and Injectors  
 
  • E. Wang
    BNL, Upton, New York, USA
  • L. Cultrera
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
 
  To be added  
slides icon Slides FRCOYBS03 [34.567 MB]  
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