Polarized Photocathode R and D for Future Linear Colliders

Journal Article · Tue Aug 04 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3215803· OSTI ID:21344485

Zhou, F; Brachmann, A; Maruyama, T; Sheppard, J C ^[1]

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1. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States)

It is a challenge to generate full charge electrons from the electron sources without compromising polarization for the proposed ILC and CLIC. It is essential to advance polarized photocathodes to meet the requirements. SLAC has worldwide unique dedicated test facilities, Cathode Test System and dc-Gun Test Laboratory, to fully characterize polarized photocathodes. Recent systematic measurements on a strained-well InAlGaAs/AlGaAs cathode at the facilities show that 87% polarization and 0.3% QE are achieved. The QE can be increased to approx1.0% with atomic hydrogen cleaning. The surface charge limit at a very low current intensity and the clear dependence of the polarization on the surface charge limit are observed for the first time. Ongoing programs to develop photocathodes for the ILC and CLIC are briefly introduced.

• OSTI ID: 21344485
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1149; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
BEAM PRODUCTION
BEAMS
CATHODES
EFFICIENCY
ELECTRODES
ELECTRON BEAMS
ELECTRON GUNS
ELECTRON SOURCES
ELEMENTS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
HYDROGEN
INDIUM ARSENIDES
INDIUM COMPOUNDS
LEPTON BEAMS
LINEAR ACCELERATORS
LINEAR COLLIDERS
NATIONAL ORGANIZATIONS
NONMETALS
PARTICLE BEAMS
PARTICLE SOURCES
PHOTOCATHODES
PNICTIDES
POLARIZATION
POLARIZED BEAMS
QUANTUM EFFICIENCY
RADIATION SOURCES
STANFORD LINEAR ACCELERATOR CENTER
TEST FACILITIES
US DOE
US ERDA
US ORGANIZATIONS