Wuppertal 2015 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: Polarisation / EDM

AKBP 8.2: Talk

Tuesday, March 10, 2015, 17:00–17:15, BZ.08.06 (HS 1)

Status of the Darmstadt Photo-Cathode Activation, Test, and Cleaning with atomic Hydrogen (Photo-CATCH) test facility — •Neeraj Kurichiyanil, Joachim Enders, Markus Wagner, Martin Espig, and Yuliya Fritzsche — Institut für Kernphysik

We report on the development status of a photocathode activation, test and cleaning using atomic hydrogen (Photo-CATCH) facility for semiconductor photocathodes used at the polarized electron source at the Darmstadt superconducting accelerator S-DALINAC. This stand-alone system consists of three ultra-high vacuum (UHV) chambers for atomic hydrogen cleaning, single- or multi-alkali negative electron affinity (NEA) activation and quantum efficiency (QE) as well as lifetime measurements and test of the activated cathodes at high-voltage, respectively. A beam-line featuring necessary characterization elements for a polarized electron beam of up to 60 keV will be available for operational QE and charge lifetime measurements and other possible experiments with spin-polarized electrons. The research is mainly aimed at improving vacuum conditions, cathode dark and charge lifetimes, exploring superior activation procedures and perfecting characterization techniques. Supported by DFG through SFB 634 and by the state of Hesse within the LOEWE centre HIC for FAIR.