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Fine-pitch and thick-foil gas electron multipliers for cosmic x-ray polarimeters

Tamagawa, Toru and Hayato, Asami and Yamaguchi, Yorito and Hamagaki, Hideki and Hashimoto, Shigehira and Inuzuka, Masahide and Miyasaka, Hiromasa and Sakurai, Ikuya and Tokanai, Fuyuki and Makishima, Kazuo (2006) Fine-pitch and thick-foil gas electron multipliers for cosmic x-ray polarimeters. In: Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray. Proceedings of SPIE. No.6266. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 62663W. ISBN 9780819463319. http://resolver.caltech.edu/CaltechAUTHORS:20180109-133536420

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Abstract

We have produced various gas electron multiplier foils (GEMs) by using laser etching technique for cosmic X-ray polarimeters. The finest structure GEM we have fabricated has 30 μm-diameter holes on a 50 μm-pitch. The effective gain of the GEM reaches around 5000 at the voltage of 570 V between electrodes. The gain is slightly higher than that of the CERN standard GEM with 70 μm-diameter holes on a 140 μm-pitch. We have fabricated GEMs with thickness of 100 μm which has two times thicker than the standard GEM. The effective gain of the thick-foil GEM is 104 at the applied voltage of 350 V per 50 μm of thickness. The gain is about two orders higher than that of the standard GEM. The remarkable characteristic of the thick-foil GEM is that the effective gain at the beginning of micro-discharge is quite improved. For fabricating the thick-foil GEMs, we have employed new material, liquid crystal polymer (LCP) which has little moisture absorption rate, as an insulator layer instead of polyimide. One of the thick-foil GEM we have fabricated has 8 μm copper layer in the middle of the 100 μm-thick insulator layer. The metal layer in the middle of the foil works as a field-shaper in the multiplication channels, though it slightly decreases the effective gain.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.671244DOIArticle
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6266/1/Fine-pitch-and-thick-foil-gas-electron-multipliers-for-cosmic/10.1117/12.671244.full?SSO=1PublisherArticle
ORCID:
AuthorORCID
Miyasaka, Hiromasa0000-0002-8074-4186
Additional Information:© 2006 SPIE.
Group:Space Radiation Laboratory
Subject Keywords:Cosmic X-ray Polarimeter, gas electron multiplier, GEM, proportional counter
Record Number:CaltechAUTHORS:20180109-133536420
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180109-133536420
Official Citation:Toru Tamagawa, Asami Hayato, Yorito Yamaguchi, Hideki Hamagaki, Shigehira Hashimoto, Masahide Inuzuka, Hiromasa Miyasaka, Ikuya Sakurai, Fuyuki Tokanai, Kazuo Makishima, "Fine-pitch and thick-foil gas electron multipliers for cosmic x-ray polarimeters", Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, 62663W (15 June 2006); doi: 10.1117/12.671244; http://dx.doi.org/10.1117/12.671244
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84195
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jan 2018 22:40
Last Modified:09 Jan 2018 22:40

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