Author: Zhang, H.
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TUXAUD03
 ERL Cooling Ring Concepts for the MEIC  
 
  • S.V. Benson, Y.S. Derbenev, D. Douglas, F.E. Hannon, F. Marhauser, R.A. Rimmer, C. Tennant, H. Wang, H. Zhang, Y. Zhang
    JLab, Newport News, Virginia, USA
  
  Funding: This work was supported by U.S. DOE Contract No. DE-AC05-84-ER40150
The MEIC design at Jefferson Lab will collide electrons in a storage ring with ions in a separate ring. In order to enhance the luminosity, the ions must be cooled in a cooling channel. The required current and charge necessary to cool the ions is on the order of 200 mA and 420 pC at an electron energy as high as 55 MeV. This is too high for a DC accelerator such as a pelletron and so the electron beam must be provided by an Energy Recovery Linac (ERL). This presentation will discuss two options for such an ERL and show some early results of modeling and simulation for these designs. At least at the highest energy, the beam quality seems to be good enough to provide a reasonable cooling rate for the ions. 		 
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TUPF02 Development of the Electron Cooling Simulation Program for MEIC 101
 
  • H. Zhang, J. Chen, R. Li
    JLab, Newport News, Virginia, USA
  • H. Huang, L. Luo
    ODU, Norfolk, Virginia, USA
  
  Funding: Work supported by the Department of Energy, Laboratory Directed Research and Development Funding, under Contract No. DE-AC05-06OR23177
In the medium energy electron ion collider (MEIC) project at Jefferson Lab, the traditional electron cooling technique is used to reduce the ion beam emittance at the booster ring, and to compensate the intrabeam scattering effect and maintain the ion beam emittance during collision at the collider ring. A DC cooler at the booster ring and a bunched beam cooler at the collider ring are proposed. To fulfil the requirements of the cooler design for MEIC, we are developing a new program, which allows us to simulate the following cooling scenarios: DC cooling to coasting ion beam, DC cooling to bunched ion beam, bunched cooling to bunched ion beam, and bunched cooling to coasting ion beam. The new program has been benchmarked with existing code in aspect of accuracy and efficiency. The new program will be adaptive to the modern multicore hardware. We will present our models and some simulation results. 		 
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TUPF09 Decoupling and Matching of Electron Cooling Section in the MEIC Ion Collider Ring 116
 
  • G.H. Wei, F. Lin, V.S. Morozov, H. Zhang
    JLab, Newport News, Virginia, USA
  
  To get a luminosity level of 1033 cm-2 s-1 at all design points of the MEIC, small transverse emittance is necessary in the ion collider ring, which is achieved by an electron cooling. And for the electron cooling, two solenoids are used to create a cooling environment of temperature exchange between electron beam and ion beam. However, the solenoids can also cause coupling and matching problem for the optics of the MEIC ion ring lattice. Both of them will have influences on the IP section and other areas, especially for the beam size, Twiss parameters, and nonlinear effects. A symmetric and flexible method is used to deal with these problems. With this method, the electron cooling section is merged into the ion ring lattice elegantly.  
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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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