Polarized electron injector for positron production at CEBAF

Conference · Fri Sep 01 04:00:00 EDT 2023

DOI:https://doi.org/10.18429/JACoW-IPAC2023-WEPA035· OSTI ID:2274960

Kazimi, R. ^[1]; Grames, J. ^[1]; Hofler, A. ^[1]; Hernandez-Garcia, C. ^[1]; Palacios Serrano, G. ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

As a part of the effort to expand the capabilities of CE-BAF 12 GeV (Continuous Electron Beam Accelerator Facility) at Jefferson Lab, the addition of a polarized positron source is considered. This capability would provide acceleration of high duty-cycle polarized posi-trons, with spin >60% polarization, through the same main CEBAF accelerator machine with appropriate mag-net field reversals and linac phasing to the four CEBAF experimental halls. To produce this positron beam, a high average current (3-10 mA) highly polarized electron beam with energy of 100 ? 150 MeV is required at the positron source target. The focus of this paper is the de-sign of that polarized electron beam injector. We will describe the production and delivery of a >3 mA highly polarized electron beam. We will discuss different aspects of the design, the photocathode gun, beam dynamics simulation results, spin manipulation, bunching and accelerating process and final electron beam parameters.

• 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: 2274960
• Report Number(s): JLAB-ACO-23-3799; DOE/OR/23177-6105
• Country of Publication: United States
• Language: English