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BE: Beschleunigerphysik

BE 10: Beam Dynamics and Fields I

BE 10.6: Talk

Wednesday, April 2, 2014, 16:15–16:30, ZEU 255

Collector efficiency measurement at a linear electron beam guiding system using a wien-filter — •Simon Friederich — Institut für Kernphysik, Johannes-Gutenberg Universität Mainz, Deutschland

A testbench for the electron cooler which is planned for the facility for antiproton and ion reasearch (FAIR) has been set up at Helmholtzinstitut Mainz (HIM). It consists of a thermionic electron gun, an energy recuperating collector and a longitudinal magnetic guiding system. Electrons hitting the collector surface may be scattered (in-)elastically or may liberate secondary electrons from the collector wall. A safe running of the electron cooler is only ensured if less than one out of one hundred thousand incoming electrons may leave the collector again. This is equivalent to a collector efficiency of >99.999%. In order to measure this quantity one has to break the symmetry between the incoming primary electron beam and the secondary beam leaving the collector. A Wien-filter is used for this purpose and further simulations were used to estimate the efficiency.