19–24 May 2024
Music City Center
US/Central timezone

Quest for an optimal spin-polarized electron source for the Electron-Ion Collider

MOPR77
20 May 2024, 16:00
2h
Rock 'n Roll (MCC Exhibit Hall A)

Rock 'n Roll

MCC Exhibit Hall A

Poster Presentation MC3.T02 Electron Sources Monday Poster Session

Speaker

Jyoti Biswas (Brookhaven National Laboratory)

Description

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.

Funding Agency

Work supported by Brookhaven Science Associates, LLC under Contract
No. DE-SC0012704 with the U.S. Department of Energy.

Region represented North America
Paper preparation format LaTeX

Primary author

Jyoti Biswas (Brookhaven National Laboratory)

Co-authors

Erdong Wang (Brookhaven National Laboratory) John Skaritka (Brookhaven National Laboratory) Omer Rahman (Brookhaven National Laboratory) Kim Kisslinger (Brookhaven National Laboratory) Tai-De Li (City College of The City University of New York) Adam Masters (Old Dominion University) Sylvain Marsillac (Old Dominion University)

Presentation materials

There are no materials yet.