Feb 20 – 22, 2013
CERN
Europe/Zurich timezone

DC electron sources for polarized beams

Feb 21, 2013, 2:00 PM
40m
30-7-018 (CERN)

30-7-018

CERN

European Organisation for Nuclear Research CH - 1211Genève 23 Switzerland

Speaker

Dr Kurt Aulenbacher (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)

Description

Spin-polarized beams of high brightness may be produced by photoemission from semiconductor superlatices, e.g. GaAs/GaAsP. A negative electron affinity (NEA) state of the semiconductor has to be provided to make photoemission energetically possible. This is achieved by a modification of the cathode surface, in particular by a sub-monolayer of Cs:0 compounds. The challenge for an accelerator application is to maintain the NEA state under running conditions. The implications for design and operation of the spin-polarized source are discussed.

Primary author

Dr Kurt Aulenbacher (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)

Presentation materials