TITLE

The 50 kV inverted source of polarized electrons at ELSA

AUTHOR(S)
Hillert, Wolfgang; Gowin, Michael; Neff, Berhold
PUB. DATE
June 2001
SOURCE
AIP Conference Proceedings;2001, Vol. 570 Issue 1, p961
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The future medium energy physics program at the electron stretcher accelerator ELSA of Bonn University mainly relies on experiments requiring a beam of polarized electrons and a polarized target. To provide a polarized beam with high polarization and sufficient intensity a pulsed 50 kV inverted gun of polarized electrons has been set into operation. The gun is operated in space charge limitation, producing a peak current of 100 mA in rectangular 1 µs long electron pulses. Photocathode lifetime during operation is higher than 3000 hours. Using a Be-InGaAs/Be-AlGaAs superlatrice photocathode a polarization of 80% and a corresponding quantum efficiency of 0.4% could be obtained.
ACCESSION #
6310100

 

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