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T: Fachverband Teilchenphysik

T 87: Gaseous detectors II

T 87.6: Vortrag

Donnerstag, 2. April 2020, 17:45–18:00, L-3.016

The Effect of Gas Contaminations on Micromegas Detectors — •Thorben Swirski, Deb Sankar Bhattacharya, and Raimund Ströhmer — Universität Würzburg

The Würzburg cosmic ray facility is used to conduct research on the behavior of Micromegas detectors. A homogeneous mixture of Argon and CO2 can be prepared in desired ratios.

The behavior of the detector changes with any impurities in the gas. Of these impurities, water has been shown to be often present. In addition, oxygen can have a large effect due to its high electronegativity, while making up about 20.95% of the air, making entry in case of a leak possible. A systematic study on such changes of the detector behavior with a controlled infusion of impurities can give us an idea about the detector responses in large experiments like ATLAS, ALICE or ILC.

To be able to produce a gas containing only trace amounts of up to 1% each of oxygen and water, the cosmic ray facility had to be augmented with a new gas system. The system was built at the end of 2018.

Since then, the system has been used to perform measurements on the typical amount of contaminants in the detector gas and their sources, such as plastic tubing. In these measurements, the influence of different materials, and pipe geometries has been evaluated at several different tube lengths. The effect on the detector performance is also being investigated, including changes in gain, the number of primary electrons lost due to attachment, transparency and high voltage stability.