Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 87: Gaseous detectors II

T 87.2: Vortrag

Donnerstag, 2. April 2020, 16:45–17:00, L-3.016

Production and Characterisation of square-meter-sized Micromegas Quadruplets — •Maximilian Herrmann, Otmar Biebel, Bernhard Flierl, Ralf Hertenberger, Christoph Jagfeld, Felix Klitzner, Maximilian Rinnagel, Sebastian Trost, Chrysostomos Valderanis, and Fabian Vogel — Ludwig-Maximilians Universität München

The momentum reconstruction of muons in high energy physics experiments requires large, high-rate-capable precision tracking detectors. Resistive strip Micromegas are ideally suited for this application. The highly segmented anode enables hit position reconstruction within one plane of about 0.1 mm resolution. The resistive strips ensures a fast quenching of discharges in the 0.12 mm high amplification gap. Using multiple modules with four layers of Micromegas a large area can be covered.

In this talk the production progress of such modules will be presented. Focus will be placed on the steps to ensure high voltage stability in the amplification gap and on validation measurements. Imperfections and dust in the gap would lead to dark currents which could harm the active area. Therefore an elaborate production scheme was developed to keep these currents below 100 nA. Using the tracks of cosmic muons in a reference facility the quadruplets can be investigated in terms of efficiency homogeneity, reaching values of 97% over two square meter.