Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Instrumentierung

HK 51.2: Vortrag

Donnerstag, 20. März 2014, 17:00–17:15, HZ 9

Integrating a gas chromatograph for measuring gas compositions in ALICE — •Martin Fleck — Physikalisches Institut, University of Heidelberg, Im Neuenheimer Feld 226

The ALICE Time Projection Chamber and Transition Radiation Detector operate with gases whose exact composition affect substantially their performance. In particular, the gas composition determines drift velocity and gas gain of these detectors and therefore its precise knowledge is crucial, both for detector calibration and for online monitoring and trigger generation.

The analysis of the gas components and contaminants from air is a challenging task. Most of the sensors available on the market are insufficient or require frequent and tedious calibration.

A solution is the use of a gas chromatograph customary configured for the detection of the concerned gases, mainly noble gases, CO₂, and the rest of the natural air components.

We present an approach of how such an instrument, after proper calibration, can be reliably operated to provide frequent samples of the gas composition. The results are subsequently transported and integrated into the detector’s control system for monitoring and archiving and for immediate use in calibration procedures.