Studies of CSR and Microbunching at Jefferson Laboratory ERLs

Conference · Tue May 01 04:00:00 EDT 2018

DOI:https://doi.org/10.18429/JACoW-ERL2017-WEIBCC004· OSTI ID:1986181

Tennant, C. ^[1]; Benson, S. ^[1]; Douglas, D. ^[1]; Li, R. ^[1]; Tsai, C.-Y. ^[2]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

One attractive feature of energy recovery linacs (ERLs) is they are source limited. However as beam brightness increases so too do the effects of coherent synchrotron radiation (CSR) and the microbunching instability. The Low Energy Recirculator Facility at Jefferson Laboratory provides a test bed to characterize aspects of CSR's effect on the beam by measuring the energy extraction via CSR as a function of bunch compression. Data was recorded with acceleration occurring on the rising part of the RF waveform while the full compression point was moved along the backleg of the machine and the response of the beam measured. Acceleration was moved to the falling part of the RF waveform and the experiment repeated. Initial start-to-end simulations using a 1D CSR model show good agreement with measurements. The experiment motivated the design of a modified Continuous Electron Beam Accelerator Facility-style arc with control of CSR and the microbunching gain. Insights gained from that study informed designs for recirculation arcs in an ERL-driven electron cooler for Jefferson Laboratory's Electron Ion Collider. Progress on the design and outstanding challenges of the cooler are discussed.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1986181
• Report Number(s): JLAB-ACP-17-2512; DOE/OR/23177-4184
• Country of Publication: United States
• Language: English