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T: Fachverband Teilchenphysik

T 116: Detektorsysteme 4

T 116.4: Vortrag

Donnerstag, 30. März 2017, 17:35–17:50, VSH 17

Signal Characterization in Two-Dimensional Floating Strip Micromegas Detectors — •Felix Klitzner, Otmar Biebel, Jonathan Bortfeldt, Bernhard Flierl, Philipp Loesel, Ralph Mueller, Maximilian Herrmann, and Ralf Hertenberger — Ludwigs-Maximilians-Universität München

Floating strip Micromegas detectors with one-dimensional readout strips are high-rate capable particle detectors with excellent spatial and temporal resolution, allowing single particle tracking for particle fluxes up to 7 MHz/cm². A floating strip Micromegas detector collects the amplified ionization charge on copper anode strips with high ohmic contact to high voltage, so called floating strips. The charge signal is read out by readout strips, separated by a thin Kapton layer from the anode strips. This scheme makes the detector robust against discharges between the micro-mesh and the floating anode strips, induced by strongly ionizing particles. A novel two-dimensional readout has been realized with two layers of readout strips, parallel and perpendicular to the floating strips. Different designs of the two-dimensional floating strip anode have been investigated, where readout strip width and order of both readout layers on the PCB have been varied. We present results from characterizing measurements using a 20 MeV proton beam and 5.9 keV photons from an ⁵⁵Fe-source, recorded with APV25 front-end boards. Detailed simulations have been set up to understand the signal formation on the two readout layers, as differences with respect to the signal polarity, duration and height are observed on the parallel and perpendicular strip layer.