Document Type

Conference Paper

Publication Date




Publication Title

Proceedings of the 15th International Particle Accelerator Conference



Conference Name

15th International Particle Accelerator Conference, 19-24 May, 2024, Nashville, TN


Superlattice GaAs photocathodes play a crucial role as the primary source of polarized electrons in various accelerator facilities, including the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson National Laboratory and the Electron-Ion Collider (EIC) at Brookhaven National Laboratory. To increase the quantum efficiency (QE) of GaAs/GaAsP superlattice photocathodes, a Distributed Bragg Reflector (DBR) is grown underneath using metal-organic chemical vapor deposition (MOCVD). There are several challenges associated with DBR photocathodes: the resonance peak may not align with the emission threshold of around 780 nm, non-uniform doping density in the top 5 nm may significantly impact QE and spin polarization, high temperature heat treatment may lead to interlayer material diffusion, and the number of DBR pairs may not be optimal, affecting both QE and spin polarization. In this paper, we will report our progress in addressing these challenges to hunt for suitable photocathodes for the EIC.


Bibliographic Note: This is a **PRE-PRESS** of the IPAC'24 proceedings released at the end of the conference. Please consider that *they may miss some papers* not yet completed in their editing, *as they may include papers that eventually will be removed* due some problems.

As this is a conference paper in press, as of July 2024, the paper's DOI,, is currently non-functional. This may change as the publisher develops it's landing page.


© 2024 The Authors.

Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.

Original Publication Citation

Biswas, J., Wang, E., Rahman, O., Skaritka, J., Kisslinger, K., Masters, A., Marsillac, S., & Lee, T. (2024). Quest for an optimal spin-polarized electron source for the Electron-Ion Collider. In Proceedings of the 15th International Particle Accelerator Conference (pp. 623-626). JACoW Publishing.


0000-0003-0826-8119 (Marsillac)