The 50 kV inverted source of polarized electrons at ELSA

Details The 50 kV inverted source of polarized electrons at ELSA The 50 kV inverted source of polarized electrons at ELSA

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..961h&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 961-964 (2001).

Physics

3

Electron Sources, Polarized Beams, Photomultipliers, Phototubes And Photocathodes, Relativistic Electron And Positron Beams

Scientific paper

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 1μs long electron pulses. Photocathode lifetime during operation is higher than 3000 hours. Using a Be-InGaAs/Be-AlGaAs superlattice photocathode a polarization of 80% and a corresponding quantum efficiency of 0.4% could be obtained. .

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