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Sep 24 – 29, 2023
US/Eastern timezone

Surface protection photocathode for spin electron source

Sep 25, 2023, 2:00 PM
30m
JuniorA1-A2 (Durham Convention Center)

JuniorA1-A2

Durham Convention Center

Talk Polarized Ion and Lepton Sources and Targets Polarized Ion and Lepton Sources and Targets

Speaker

Jyoti Biswas (Brookhaven National Laboratory)

Description

Currently, GaAs-based photocathodes with CsO activation layer serve as the practical source of polarized electrons. However, a thin CsO layer is susceptible to vacuum poisoning. Recent studies have shown that graphene, when applied as a thin layer, can effectively hinder the reaction between reactive gas molecules like oxygen and carbon dioxide. However, the deposition of a monolayer 2D material onto GaAs based photocathodes presents a significant challenge due to the stringent vacuum requirements. The incorporation of a novel technique called intercalation offers a solution to this issue, as alkali atoms can pass through defects in a graphene thin film to create photocathodes with a monolayer graphene protection layer on top. The utilization of the intercalation process for fabricating alkali-based photocathodes with graphene protection shows great promise. In this work, we will present our advancements in incorporating a graphene-based protection layer on different photocathodes.

Primary authors

Dr Ao Liu (University of Chicago) Dr Erdong Wang (Brookhaven National Laboratory) Jyoti Biswas (Brookhaven National Laboratory) Dr Mengjia Gaowei (Brookhaven National Laboratory)

Co-authors

Dr Jerzy Sadowski (Brookhaven National Laboratory) Dr John Smedley (SLAC National Accelerator Laboratory) Dr Kali Mondal (Brookhaven National Laboratory) Dr Liliana Stan (Argonne National Laboratory) Dr Shashi Poddar (Euclid Techlabs) Dr Xiao Tong (Brookhaven National Laboratory)

Presentation materials