Author: Seryi, A.
Paper Title Page
MOCOZBS01
 The Use of ERLs to Cool High Energy Ions in Electron-Ion Colliders  
 
  • S.V. Benson, A. Seryi, C. Tennant, Y. Zhang
    JLab, Newport News, Virginia, USA
  • G. Stupakov
    SLAC, Menlo Park, California, USA
  • F.J. Willeke
    BNL, Upton, New York, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
Future electron-ion colliders collide high-intensity ion beams with high current electron beams. The electron beams take advantage of synchrotron radiation to damp emittances but the ion beams must be cooled via a beam cooling mechanism, including electron cooling. The ion energies are typically a few hundreds of GeV per nucleon, for an electron-ion collider envisioned to be built in US. At this energy, DC coolers powered by electrostatic accelerators, are not useful. The ERL, in principle, can provide the high current and brightness to cool these high-brightness ion beams. The beam quality requirements are much different from previous ERLs designs used for FELs. The cooling bunch must be much longer than in an FEL and the relative energy spread must be very small. Incoherent cooling can be enhanced with magnetized beams, but the magnetization must be maintained throughout the ERL. An alternate cooling mechanism, the so-called Coherent Electron Cooling, is, in principle, stronger and can be done with non-magnetized beams. We will present several applications of ERLs to high energy electron cooling and describe the technical challenges that must be overcome to build such an ERL. 		 
slides icon Slides MOCOZBS01 [2.714 MB]  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WECOYBS05
 Asymmetric SRF Dual Axis Cavity for ERLs: Studies and Design for Ultimate Performance and Applications  
 
  • I.V. Konoplev, M.E. Topp-Mugglestone
    JAI, Oxford, United Kingdom
  • A.M. Bulygin, Ya.V. Shashkov
    MEPhI, Moscow, Russia
  • F. Marhauser, A. Seryi
    JLab, Newport News, Virginia, USA
  
  A dual axis asymmetric SCRF ERL has been recently proposed as a possible way to drive a high average current electron beam while avoiding the BBU instability excitation. Such high current ERLs can be attractive for the next generation light sources, beam cooling in electron ion collider and isotope production. Here the results of the studies of band-pass modes and HOMs will be shown. The field distribution of the modes will be shown and asymmetric field distribution of HOMs will be demonstrated and HOMs excitations using dipole couplers will be discussed. The original design of the dual axis asymmetric cavity has been optimised to minimize the peaks of magnetic and electric fields on the cavity surface, to increase the distance between operating mode and neighbouring parasitic mode as well as to reduce the cavity manufacturing cost. To reach the goals several solutions have been suggested leading to simplification of the manufacturing as well as bringing the fields amplitudes on the cavity surface to the acceptable values. The new design of the cavity will be presented and possible applications of such a high-current ERL will be discussed.  
slides icon Slides WECOYBS05 [1.841 MB]  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)