Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 71: Myondetektoren 1

T 71.1: Vortrag

Montag, 4. März 2013, 11:00–11:15, GER-039

Performance of a Micromegas Detector with Novel Floating Strip Anode — •Jonathan Bortfeldt, Otmar Biebel, Ralf Hertenberger, Philipp Lösel, Samuel Moll, and Andre Zibell — LS Schaile, LMU München

A novel 50 cm × 48 cm large Micromegas (MICRO MEsh GAS detector) with a floating strip anode formed by 1920 copper strips with 150 µm width and 250 µm pitch has recently been tested in high-energy pion beams at SPS/CERN. For improved discharge behavior, the high-voltage is applied to each readout strip individually via 10 MΩ resistors. A track telescope consisting of six standard non-resistive and two resistive Micromegas provided a track resolution below 15 µm. 30 million pion tracks have been collected at hit rates between 0.5 kHz and 100 kHz for various detector inclinations and positions.

We present results on the performance of the large floating strip Micromegas with respect to efficiency, gas gain, discharge behavior and spatial resolution and compare with standard and resistive Micromegas. Recording the arrival time of charge clusters, TPC-like operation allows for direct angular resolution in single plane readout. We discuss the achieved resolution as a function of track inclination.