Iwahashi, T. and Tamagawa, T. and Hayato, A. and Nakamura, S. and Konami, S. and Asami, F. and Yasuda, N. and Kitamura, H. and Sakurai, H. and Tokanai, F. and Miyasaka, H. and Makishima, K. (2011) Heavy Ion and Proton Irradiation of Gas Electron Multipliers With Liquid Crystal Polymer Insulator: Evaluation Tests for Use in Space. IEEE Transactions on Nuclear Science, 58 (5). pp. 2401-2406. ISSN 0018-9499 http://resolver.caltech.edu/CaltechAUTHORS:20111115-094601518
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Gas electron multipliers with a liquid crystal polymer insulator (LCP-GEMs) can be employed as X-ray polarimeters in several satellite missions in low-earth orbit. To evaluate their resistance to radiation, LCP-GEMs were exposed to Fe ion and proton beams from the heavy-ion accelerator facility HIMAC, and the gas gain was monitored. The LCP-GEMs survived 14.4-year-equivalent irradiation by fully stripped Fe ions with an energy of 500 MeV nuc^(-1), which simulated galactic cosmic-ray ions. We also studied the degradation of the insulator layer of the LCP-GEMs by irradiation with 160 MeV protons to simulate geomagnetically trapped protons. After irradiation with protons for 31.6 years equivalent, no significant change in gain was observed.
|Additional Information:||© 2011 IEEE. Manuscript received January 14, 2011; revised May 06, 2011 and June 26, 2011; accepted July 04, 2011. Date of publication August 18, 2011; date of current version October 12, 2011. This work was supported in part by the Japan Society for the Promotion of Science, a Grant-in-Aid for Young Scientists (A)(19684008), a Grant-in-Aid for Scientific Research (A)(22244034), and a Grant-in-Aid for JSPS Fellows (22·7385). Part of the experiments in this paper were carried out as a research project with heavy ions at NIRS-HIMAC (19P228).|
|Group:||Space Radiation Laboratory|
|Subject Keywords:||Gas electron multiplier; GEM, GEMS satellite; space application; x-ray polarimeter.|
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|Official Citation:||Iwahashi, T.; Tamagawa, T.; Hayato, A.; Nakamura, S.; Konami, S.; Asami, F.; Yasuda, N.; Kitamura, H.; Sakurai, H.; Tokanai, F.; Miyasaka, H.; Makishima, K.; , "Heavy Ion and Proton Irradiation of Gas Electron Multipliers With Liquid Crystal Polymer Insulator: Evaluation Tests for Use in Space," Nuclear Science, IEEE Transactions on , vol.58, no.5, pp.2401-2406, Oct. 2011 doi: 10.1109/TNS.2011.2162001|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||15 Nov 2011 21:12|
|Last Modified:||04 Mar 2013 23:00|
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