Latest results from time resolved intensity and polarization measurements at MAMI

Details Latest results from time resolved intensity and polarization measurements at MAMI Latest results from time resolved intensity and polarization measurements at MAMI

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..926s&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 926-929 (2001).

Physics

Electron Sources, Polarized Beams, Photomultipliers, Phototubes And Photocathodes, Cyclic Accelerators And Storage Rings, Relativistic Electron And Positron Beams, Beam Analyzers, Beam Monitors, And Faraday Cups

Scientific paper

At the Institute of Nuclear Physics at Mainz we investigate time resolved intensity and polarization spectra in the photoelectron emission from different types of highly polarized p-type strained layer and superlattice photo cathodes used for polarized electron sources at accelerator facilities. After several improvements concerning time resolution and phase stability the observed response times decreased to 2-2.5 ps which is the time resolution of our setup. Obtaining these short response times we decided to reinvestigate the emission process using simpler GaAs structures with different layer thickness. With the new data one may have to reconsider the escape process of the electrons for thin active layers. The measured response times of about 1 ps or less for 100-200 nm active layer thickness suggest some ballistic traveling of the electrons through the crystal without interaction. For these electrons energy loss and depolarization seem to take place only in the bent band region or on the crystal surface. .

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