Concept of a Polarized Positron Source for CEBAF

Conference · Fri Jul 01 00:00:00 EDT 2022

DOI:https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK012· OSTI ID:1967930

Habet, Sami ^[1]; Roblin, Y. ^[2]; Bodenstein, R. M. ^[2]; Bogacz, S. A. ^[2]; Grames, J. ^[2]; Hofler, A. ^[2]; Kazimi, R. ^[2]; Lin, F. ^[2]; Poelker, M. ^[2]; Seryi, A. ^[2]; Suleiman, R. ^[2]; Sy, A. ^[2]; Turner, D. ^[2]; Ushakov, A. ^[3]; Valerio-Lizarraga, C. A. ^[4]; Voutier, E. ^[3]

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1. Université Paris-Saclay; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
3. Université Paris-Saclay
4. Universidad Autónoma de Sinaloa

Positron beams would provide new and meaningful probes for the experimental program at the Thomas Jefferson National Accelerator Facility (JLab), including but not limited to future hadronic physics and dark matter experiments. Critical requirements involve generating positron beams with a high degree of spin polarization, sufficient intensity and a continuous-wave (CW) bunch train compatible with acceleration to 12 GeV at the Continuous Electron Beam Accelerator Facility (CEBAF). To address these requirements, a polarized positron injector based upon the bremsstrahlung of an intense CW spin polarized electron beam is considered [1]. First a polarized electron beam line provides >1 mA of polarized electrons at ~120 MeV to a high-power target for positron production. Next, a second beam line collects, shapes and aligns the spin of positrons for users. Finally, the positron beam is matched into the CEBAF acceptance for acceleration and transport to the end stations with energies up to 12 GeV. An optimized layout to provide positrons beams with intensity >100 nA (polarized) or intensity >3 µA (unpolarized) will be discussed in this poster. Keywords: High duty-cycle positron beams, high positron beam polarization, PEPPo polarization transfer technique.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1967930
• Report Number(s): JLAB-ACC-22-3783; DOE/OR/23177-5955
• Resource Relation: Conference: IPAC22 (13th International Particle Accelerator Conference), Bangkok, Thailand, June 12–17, 2022
• Country of Publication: United States
• Language: English