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Performance optimisation of the micro pixel chamber

2005; Elsevier BV; Volume: 540; Issue: 2-3 Linguagem: Inglês

10.1016/j.nima.2004.11.041

1872-9576

Marina Bouianov, Oleg Bouianov, T. Nagayoshi, H. Kubo, K. Miuchi, Reiko Orito, Atsushi Takada, Atsushi Takeda, T. Tanimori,

CCD and CMOS Imaging Sensors

A thorough performance analysis of large-area μ-PIC detectors has been made. Through systematic simulations and comparison with test results of the two detector versions, μ-PIC1 and μ-PIC3, we have identified that low primary electron collection was responsible for the degradation of measured gas gain of the μ-PIC3 device. The test of a new detector, μ-PIC5, fabricated with a narrower inter-cathode gap and anodes raised above the insulator surface, shows a threefold increase in gas gain reaching 104 in argon 80%–ethane 20% gas mixture, which agrees with simulations. The new detector demonstrates a stable long-term operation at high gains, above 6000 measured during more than 70 h with an X-ray source, with a moderate 6% gain increase due to dielectric polarisation.