Document Type

Conference Paper

Publication Date

2025

DOI

10.22323/1.472.0026

Publication Title

Proceedings of 20th International Workshop on Polarized Source, Targets, and Polarimetry - PoS(PSTP2024)

Volume

472

Pages

026

Conference Name

20th International Workshop on Polarized Source, Targets, and Polarimetry, PSTP 2024, September 22-27, 2024, Newport News, VA, USA

Abstract

Superlattice GaAs photocathodes are vital for producing polarized electron beams for the Electron-Ion Collider (EIC) at Brookhaven National Laboratory. The electron pre-injector at the EIC requires a 7 nC bunch with at least 85% spin polarization from a GaAs-based superlattice cathode. The doping density of the very surface layer of the cathode needs to be optimized to extract a high bunch charge beam from the high-voltage DC gun. The polarization axis of the emitted beam is longitudinal, and it will be rotated to transverse direction using two Wien filters, each rotating the spin by 45 degrees. In this paper, we report our progress in recent R&D efforts for polarized photocathodes, and spin considerations for the EIC.

Original Publication Citation

Biswas, J., Wang, E., Rahman, O., Skaritka, J., Masters, A., Marsillac, S., & Li, T.-D. (2025). Polarized photocathode R&D at BNL and spin consideration for the EIC preinjector. Proceedings of 20th International Workshop on Polarized Source, Targets, and Polarimetry - PoS(PSTP2024). 472, Article 026. https://doi.org/10.22323/1.472.0026

ORCID

0009-0009-4724-8859 (Masters), 0000-0003-0826-8119 (Marsillac)

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