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Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Astroteilchenphysik

HK 28.5: Talk

Tuesday, March 18, 2014, 18:15–18:30, HZ 9

An active electron dump for PERC — •Carmen Ziener, Christoph Roick, Lukas Raffelt, Ulrich Schmidt, and Bastian Märkisch — Physikalisches Institut, Universität Heidelberg, Germany

The instrument PERC (Proton Electron Radiation Channel) is currently under construction at the FRM-II and will be used for precision spectroscopy on electrons and protons from neutron beta decay and to measure asymmetries like the beta asymmetry on the 10−4 level. A key feature of PERC is a magnetic barrier field which lets only pass about 1/16 of all electrons or protons from neutron decay. Only these particles will afterwards be guided to the detectors. All other particles will be absorbed in a dump at the other end of the instrument. In electron spectroscopy, backscattering off of this beam dump or the detectors can in principle be a significant source of systematic error. We present the concept of an active electron beam dump, which is used to suppress and control this effect.

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