First tests of a Micromegas TPC in a magnetic field

Abstract : Since the summer of 2003, a large Micromegas TPC prototype (1000 channels, 50 cm drift, 50 cm diameter) has been operated in a 2T superconducting magnet at Saclay. A description of this apparatus and first results from cosmic ray tests are presented. Additional measurements using simpler detectors with a laser source, an X-ray gun and radio-active sources are discussed. Drift velocity and gain measurements, electron attachment and aging studies for a Micromegas TPC are presented. In particular, using simulations and measurements, it is shown that an $Argon-CF_4$ mixture is optimal for operation at a future Linear Collider.
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Submitted on : Friday, December 10, 2004 - 2:36:16 PM
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P. Colas, I. Giomataris, V. Lepeltier, M. Ronan. First tests of a Micromegas TPC in a magnetic field. Xth Vienna Conference on Instrumentation, Feb 2004, Vienne, Austria. pp.181-185, ⟨10.1016/j.nima.2004.07.123⟩. ⟨in2p3-00023416⟩

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