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

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

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6266e.116t&link_type=abstract

Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray. Edited by Turner, Martin J. L.; Hasinger, Günther. Proceedi

Physics

3

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

Fine-pitch and thick-foil gas electron multipliers for cosmic x-ray polarimeters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Fine-pitch and thick-foil gas electron multipliers for cosmic x-ray polarimeters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fine-pitch and thick-foil gas electron multipliers for cosmic x-ray polarimeters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1621171