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24 April 2024

» arxiv » 0905.2655

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Cosmic Ray Tests of the Prototype TPC for the ILC Experiment
K. Ackermann ; S. Arai ; D. C. Arogancia ; A. M. Bacala ; M. Ball ; T. Behnke ; H. Bito ; V. Eckardt ; K. Fujii ; T. Fusayasu ; N. Ghodbane ; H. C. Gooc Jr. ; T. Kijima ; M. Hamann ; M. Habu ; R. -D. Heuer ; K. Hiramatsu ; K. Ikematsu ; A. Kaukher ; H. Kuroiwa ; M.E. Janssen ; Y. Kato ; M. Kobayashi ; T. Kuhl ; T. Lux ; T. Matsuda ; S. Matsushita ; A. Miyazaki ; K. Nakamura ; O. Nitoh ; H. Ohta ; R. L. Reserva ; K. Sakai ; N. Sakamoto ; T. Sanuki ; R. Settles ; A. Sugiyama ; T. Takahashi ; T. Tomioka ; H. Tsuji ; T. Watanabe ; P. Wienemann ; R. Wurth ; H. Yamaguchi ; M. Yamaguchi ; A. Yamaguchi ; T. Yamamura ; H. Yamaoka ; T. Yazu ; R. Yonamine ;
Date:	18 May 2009
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 x 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 x B effect as had been expected 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, in which MWPCs could be prone to discharges, 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 measured drift properties of this mixture including the diffusion constant as a function of the electric field and compare them with the predictions of Magboltz. Also presented is the spatial resolution of a GEM-based ILC-TPC estimated from the measurement with the prototype.
Source:	arXiv, 0905.2655
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