Author: Zhang, Y.
Paper Title Page
TUP15 Experimental Demonstration of Electron Cooling with Bunched Electron Beam 61
 
  • L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  • A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, M. Spata, H. Wang, S. Wang, H. Zhang, Y. Zhang
    JLab, Newport News, Virginia, USA
 
  Funding: This work was supported by the Hundred Talents Project of the Chinese Academy of Sciences and National Natural Science Foundation of China (Nos. 11575264, 11475235, 11375245)
Electron cooling at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler was modified by pulsing the grid voltage, by which a 0.5-3.5 us of electron bunch length with a repetition frequency of less than 250 kHz was obtained. The first experiment demonstrated cooling coasting and bunched ion beam by a bunched electron beam was carried out at the storage ring CSRm at IMP. A preliminary data analysis has indicted the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam. A longitudinal grouping effect of coasting ion beam by the electron bunch has also observed. In this paper, we will present the experiment result and its preliminary comparison to the simulation modeling.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP15  
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WEM12 Development of a Bunched Beam Electron Cooler Based on ERL and Circulator Ring Technology for the Jefferson Lab Electron-Ion Collider 72
 
  • S.V. Benson, Y.S. Derbenev, D. Douglas, F.E. Hannon, A. Hutton, R. Li, R.A. Rimmer, Y. Roblin, C. Tennant, H. Wang, H. Zhang, Y. Zhang
    JLab, Newport News, Virginia, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosity at a 45 GeV center-of-mass energy. This luminosity relies on ion cooling in both the booster and the storage ring of the accelerator complex. The cooling in the booster will use a conventional DC cooler similar to the one at COSY. The high-energy storage ring, operating at a momentum of up to 100 GeV/nucleon, requires the novel use of bunched-beam cooling. There are two designs for such a bunched beam cooler. The first uses a conventional Energy Recovery Linac (ERL) with a magnetized beam while the second uses a circulating ring to enhance both the peak and average current experienced by the ion beam. This presentation will describe the design of both the Circulator Cooling Ring (CCR) design and that of the backup option using the stand-alone ERL operated at lower charge but higher repetition rate than the ERL injector required by the CCR-based design.
 
slides icon Slides WEM12 [5.124 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-WEM12  
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THM14
Overview of US Electron-ion Collider Project and its Beam Cooling Programs  
 
  • Y. Zhang
    JLab, Newport News, Virginia, USA
 
  Electron-Ion collider (EIC) utilizes deep-inelastic scatterings to probe structures of nucleus. HERA, the only e-p collider ever built and operated, ended its science program in 2007. Over the past 15 years, 7 next generation EICs were envisioned worldwide for high energy and nuclear physics. In the US, two electron-ion colliders, eRHIC and JLEIC, have been proposed in BNL and JLab respectively. The US EIC designs were guided by the science program (EIC White Paper). The US NSAC Long Range Plan (2015) recommended EIC as the next major facility in US for QCD frontier. If approved by DOE, construction will likely be completed around 2025. Cooling of proton/ion beams is essential for eRHIC and JLEIC to reach luminosity above 1034/cm2/s. It enables emittance reduction up to an order of magnitude in all dimensions. eRHIC adopts the novel Coherent-electron-Cooling (CeC) concept. JLEIC has chosen magnetized electron cooling for the baseline, utilizing a multi-stage cooling scheme. Both CeC and high energy magnetized EC are under active development: BNL plans to conduct a proof-of-principle test of CeC at RHIC next year; JLab focuses on a technical design and technology development for a high energy bunched beam electron cooler based on ERL and circulator ring.  
slides icon Slides THM14 [35.872 MB]  
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