Author: Tang, M.T.
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TUXAUD04
 Conceptual Design of the HIAF Electron Cooling System  
 
  • L.J. Mao, W.P. Chai, J. Li, P. Li, X.M. Ma, G.D. Shen, L.N. Sheng, M.T. Tang, J.W. Xia, T.L. Yan, J.C. Yang, X.D. Yang, D.Y. Yin, Y.J. Yuan, H. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  A new accelerator complex HIAF is under design at IMP Lanzhou to provide intense primary and radioactive ion beams for nuclear physics, atomic physics and applied researches. The key parts of HIAF are the booster ring which is used to accumulated heavy ions and the spectrometer ring which can be used as platform for nuclear and atomic physics experiments. A magnetized electron cooling device is supposed to be used in the booster ring for decreasing the transverse emittance of injected beams. Meanwhile, a magnetized electron cooling device together with a ultra-low temperature electron target are also considered to be equipped in the spectrometer ring. In this paper, the conceptual design and main parameters of the electron cooling devices are presented, and the instabilities of cooled high intensity heavy-ion beams are discussed preliminarily.  
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TUYAUD03 Formation of Bunched Electron Beam at the Electron Cooler of CSRm 85
 
  • X.D. Yang, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan
    IMP/CAS, Lanzhou, People's Republic of China
  
  The motivation for formation of bunched electron beam at the electron cooler of CSRm is based on the three requirements. Firstly, the high energy electron cooling, especially, the ion beam with TeV energy, the bunched electron beam for cooling would be easier than the DC operating mode. Secondly, the electric field induced by the intensity modulated electron beam will be used for the suppression of instability developed in the high intensity ion beam after accumulation with the help of electron cooling, Thirdly, the electron beam was required to turn on and off in the different period of the atomic physics experiments. Some initial design and consideration were presented in this paper. And also the current situation and condition of CSRm electron cooler were described here. An off-line testbench will be established in the laboratory, and the test and the optimization will be explored in this experimentation. The validity of this system will be verified in the near future. The procedure of the modulation on the voltage of control electrode in the electron gun of the CSRm cooler was discussed. The scheme of off-line measurement was devised according to the progress.  
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TUPF11
 Progress in Experimental Demonstration of Cooling of Ions by a Bunched Electron Beam  
 
  • L.J. Mao, X.M. Ma, M.T. Tang, H. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  • A. Hutton, H. Wang, H. Zhang, Y. Zhang
    JLab, Newport News, Virginia, USA
  • V.V. Parkhomchuk, V.B. Reva
    BINP SB RAS, Novosibirsk, Russia
  
  Electron cooling is essential for achieving high luminosities for hadron colliders by enabling a reduction of emittance of hadron beams in storage rings. For several future projects such as low energy RHIC cooling program (LEReC) at BNL, a low energy electron-ion collider based on HIAF at IMP and a Medium energy Electron-Ion Collider (MEIC) at JLab, since the hadron beam energies are in a range from several GeV to 100 GeV, the required electron energy is up to 55 MeV. Such high energy electron beams can only be provided by a RF/SRF linac. As a result, the electron beam is highly bunched. Cooling of ions by a bunched electron beam has never been realized before, thus it becomes a critical R&D to these projects. Recently we proposed a proof-of-concept experiment to demonstrate cooling by a bunched electron beam utilizing an existing DC cooler at IMP. Here we present a progress report of this experiment. We briefly describe the experiment and show the design parameters. We then report hardware installation and results of the bench tests. We also summarize the results of the cooling simulation studies and discuss the required beam measurement capability.  
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