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−CF4 mixture is optimal for operation at a future Linear Collider.
Cite
@article{arxiv.physics/0412062,
title = {First tests of a Micromegas TPC in a magnetic field},
author = {P. Colas and I. Giomataris and V. Lepeltier and M. Ronan},
journal= {arXiv preprint arXiv:physics/0412062},
year = {2014}
}