Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Instrumentation XIII
HK 42.2: Vortrag
Mittwoch, 28. Februar 2018, 16:45–17:00, Audimax H1
Instrumentation and optimization studies for a Beam Dump Experiment (BDX) @ MESA — •Mirco Christmann for the MAGIX collaboration — Institut für Kernphysik - Johannes Gutenberg Universität, Mainz, Deutschland
At the Institute for Nuclear Physics in Mainz the new electron accelerator MESA will go into operation within the next years. In the extracted beam operation (155 MeV, 150 µA) the P2 experiment will measure the weak mixing angle in electron-proton scattering in 10,000 hours operation time. Therefore the high-power beam dump of this experiment is ideally suited for a parasitic dark sector experiment.
In an ongoing MadGraph cross section generation and Geant4 simulation this beam dump experiment is studied. In theory dark photons A’ are generated in the beam dump by a process analog to electromagnetic bremsstrahlung and they decay invisible to pairs of dark matter particles χ χ. In a calorimeter behind the beam dump electrons, scattered off by dark matter particles, can be detected.
For an efficient experiment the number of produced dark photons and the probability of detecting dark matter particles has to be optimized. One topic of this talk is the optimization of the existing beam dump with a tungsten target. The quantity of high energy photons can be increased with this additional target. For the detection of the dark matter particles the performance of possible calorimeter materials (CsI(Tl), PbF2, BGO and lead-glass) was investigated.