Author: Delayen, J.R.
Paper Title Page
TUCOYBS03
 Superconducting Twin-Axis Cavity for ERL Applications  
 
  • H. Park, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • H. Park
    JLab, Newport News, Virginia, USA
  
  Superconducting cavities with two beam pipes have been proposed in the past for energy recovery linac applications. The relatively complex geometry of those cavities presented a serious challenge for fabrication and surface processing. Main concerns have now been overcome with the production and successful RF testing of a new elliptical twin-axis cavity proposed by Jefferson Lab and optimized by the Center for Accelerator Science at Old Dominion University in the frame of a DoE accelerator stewardship program. The cavity design provides uniform accelerating or decelerating fields for both beams. This paper describes the cavity design, fabrication experience, and the first cold RF test results and explores potential applications especially for the proposed Jefferson Lab electron-ion Collider (JLEIC).  
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THCOZBS03
 Magnetized Beam Generated from DC Gun for JLEIC Electron Cooler  
 
  • S.V. Benson, P.A. Adderley, J.F. Benesch, D.B. Bullard, J.M. Grames, J. Guo, F.E. Hannon, J. Hansknecht, C. Hernandez-Garcia, R. Kazimi, G.A. Krafft, M.A. Mamun, M. Poelker, R. Suleiman, M.G. Tiefenback, Y.W. Wang, S. Zhang
    JLab, Newport News, Virginia, USA
  • J.R. Delayen
    ODU, Norfolk, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
Bunched-beam electron cooling is a key feature of all proposed designs of the future electron-ion collider, and a requirement for achieving the specified collision luminosity of the order 1034 cm-2s−1. For the Jefferson Lab Electron Ion Collider (JLEIC), fast cooling of ion beams will be accomplished via so-called ’magnetized electron cooling’, where the cooling process will occur inside a long solenoid field, which will be part of the collider ring and facilitated using a circulator ring and Energy Recovery Linac (ERL). In this contribution, we describe recent achievements that include the generation of picosecond-bunch magnetized beams at average currents up to 28 mA with exceptionally long photocathode lifetime, and independent demonstrations of magnetized beam with high bunch charge up to 700 pC at 10s of kHz repetition rates using a compact 300 kV DC high voltage photogun with an inverted insulator geometry and alkali-antimonide photocathodes. Magnetization characterization including beam rotation and drift emittance were also presented for various gun bias voltages and laser spot sizes at the photocathode using 532 nm lasers with DC and RF time structure. These accomplishments mark important steps toward demonstrating the feasibility of a technically challenging JLEIC cooler design using magnetized beams. 		 
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