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A study with a small prototype TPC for the international linear collider experiment

Abstract : A time projection chamber (TPC) is a strong candidate for the central tracker of the international linear collider (ILC) experiment and we have been conducting a series of cosmic ray experiments under a magnetic field up to 4 T, using a small prototype TPC with a replaceable readout device: multi-wire proportional chamber (MWPC) or gas electron multiplier (GEM). We first confirmed that the MWPC readout could not be a fall-back option of the ILC-TPC under a strong axial magnetic field of 4 T since its spatial resolution suffered severely from the so called E×B effect in the vicinity of the wire planes. The GEM readout, on the other hand, was found to be virtually free from the E×B effect and gave the resolution determined by the transverse diffusion of the drift electrons (diffusion limited). Furthermore, GEMs allow a wider choice of gas mixtures than MWPCs. Among the gases we tried so far a mixture of Ar–CF4-isobutane seems promising as the operating gas of the ILC-TPC because of its small diffusion constant especially under a strong magnetic field. We report the spatial resolution obtained with the GEM readout in this gas mixture. Also presented is the spatial resolution of a GEM-based ILC-TPC estimated from the measurement with the prototype.
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Contributor : Sophie Heurteau <>
Submitted on : Thursday, January 6, 2011 - 11:08:13 AM
Last modification on : Wednesday, October 14, 2020 - 3:59:27 AM

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K. Ackermann, S. Arai, D. C. Arogancia, A.M. Bacala, M. Ball, et al.. A study with a small prototype TPC for the international linear collider experiment. 1st International Conference on Technology and Instrumentation in Particle Physics, Mar 2009, Tsukuba, Japan. pp.141-143, ⟨10.1016/j.nima.2010.02.175⟩. ⟨in2p3-00552154⟩



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