Cosmic ray tests of a GEM-based TPC prototype operated in Ar-CF4-isobutane gas mixtures

Details Cosmic ray tests of a GEM-based TPC prototype operated in Ar-CF4-isobutane gas mixtures Cosmic ray tests of a GEM-based TPC prototype operated in Ar-CF4-isobutane gas mixtures

2010-08-30

arxiv.org/abs/1008.5068v2

Nucl.Instrum.Meth.A641:37-47,2011

Physics

Instrumentation and Detectors

22 pages, 18 figures. To be submitted to Nucl. Instr. and Meth. A

Scientific paper

10.1016/j.nima.2011.02.042

Argon with an admixture of CF4 is expected to be a good candidate for the gas mixture to be used for a time projection chamber (TPC) in the future linear collider experiment because of its small transverse diffusion of drift electrons especially under a strong magnetic field. In order to confirm the superiority of this gas mixture over conventional TPC gases we carried out cosmic ray tests using a GEM-based TPC operated mostly in Ar-CF4-isobutane mixtures under 0 - 1 T axial magnetic fields. The measured gas properties such as gas gain and transverse diffusion constant as well as the observed spatial resolution are presented.

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