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12-16 September 2005
University of Liverpool
Europe/Zurich timezone

A very large area Micro Pixel Chamber

15 Sep 2005, 10:30
University of Liverpool

University of Liverpool

Greenbank Conference Park
Board: P39
Contributed Poster New Gas-based Tracking Detectors P : Coffee and Poster Session


Mr Atsushi Takada (Kyoto University)


A Micro Pixel Chamber, called “-PIC”, is a gaseous 2D imaging detector with a fine pixel electrode based on the Printed Circuit Board technology, and we developed it for the X/gamma-ray imaging and the tracking of the charged particles [1]. The previous -PIC has a fine position resolution (RMS ~120m), a high gas gain (Max ~15000), good gas gain uniformity (4.5% RMS) and the stable operation (more than 1000 hour). But the detection area of the previous -PIC (~10×10 cm2) is not large enough for a variety of the application, for example an MeV gamma-ray Compton camera [2] and dark matter search [3]. For these purpose, we developed a new -PIC having a ~30×30 cm2 detection area. The structure and the pitch of the electrode are same as those of the previous -PIC. There are 768×768 pixels in the whole area, and each pixel works as a proportional counter. The anodes and the cathodes of the pixels are formed on the 768 anode strips and the 768 cathode strips, which connect to the read-out board with the wire bonding, and the anode strips are orthogonal to the cathode strips. Therefore, this large -PIC is expected to have a fine 2 dimensional position resolution same as the previous -PIC, and the 9 times detection area. The yield of the first production was about 50%, and there is only ~1% dead pixels in the whole area. By these results, it is a prospect to the mass production of the - PIC. We started the test operation of this large -PIC at the beginning of 2005, and we succeeded to detect the first signal with -ray of 90Sr/Y. This -PIC (SN041129-1) worked with a stable gas gain of ~3000 and a maximum gain of ~6000 at the center, and the ratio of the gain was 2.2 between the minimum and the maximum gain area. An X- ray image of 30×30cm2 was also taken by irradiating the X-rays from 109Cd (22keV) to the whole detection area. And, for more applications, we are developing a time projection chamber with a large volume (~30×30×30cm3). In this presentation, we will report the manufacturing quality and performance of the first large area -PIC, and we also present the development of the readout system and a large size time projection chamber for an application of the new -PIC. References [1] A. Ochi et al., Nucl. Instr. and Meth. A, vol. 478, pp. 196- 199, 2002; T. Nagayoshi et al., Nucl. Instr. and Meth. A, vol. 525, pp. 20-27, 2004. [2] T. Tanimori et al., New Astro. Rev., vol. 48, pp. 263-268, 2004. [3] T. Tanimori et al., Phys. Lett. B, vol. 578, pp. 241-246, 2004.

Primary author

Mr Atsushi Takada (Kyoto University)

Presentation materials