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

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arxiv 1008.5068 v4 pith:EN7B3DBW submitted 2010-08-30 physics.ins-det hep-ex

classification physics.ins-dethep-ex
keywords ar-cf4-isobutanecosmicdiffusiongem-basedmagneticmixturemixturesoperated
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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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