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T: Fachverband Teilchenphysik

T 81: Myondetektoren 2

T 81.2: Talk

Wednesday, March 26, 2014, 17:00–17:15, P12

GEM-Detector for tracking of X-Rays and Thermal Neutrons — •Bernhard Flierl, Otmar Biebel, Jonathan Bortfeldt, Ralf Hertenberger, and Andre Zibell — LS Schaile - LMU München

Micropattern Detectors like GEM (gaseous electron multiplier) or Micromegas (micro mesh gaseous structure) are well suited for tracking charged particles. To improve their capability to track neutral particles, converter foils may be utilized as cathodes. In this experiment a GEM detector with an active volume of 90×100×10 mm³ and one-dimensional strip readout is used. For detection of X-rays high-Z materials are advantageous. Tracking the photoelectrons created in a 460 nm gold conversion layer allows for reconstruction of the interaction point in the Au-foil and by use of a Time Projection Chamber (TPC) like detection mode with time resolving electronics for the determination of the incoming direction. For thermal neutrons a similar approach is chosen: a boron-rich layer will create MeV beta particles, which can also be detected in the active gas volume of the detector. The design principle will be presented as well as interaction efficiencies and first tracking results.