Physics – Instrumentation and Detectors
Scientific paper
2009-09-18
JINST 4:P12006,2009
Physics
Instrumentation and Detectors
Contribution to the proceedings of the MPGD'09 conference, Crete
Scientific paper
10.1088/1748-0221/4/12/P12006
We developed a method to make GEM foils with a spherical geometry. Tests of this procedure and with the resulting spherical GEMs are presented. Together with a spherical drift electrode, a spherical conversion gap for x-rays can be formed. This would eliminate the parallax error in an x-ray diffraction setup, which limits the spatial resolution at wide diffraction angles. The method is inexpensive and flexible towards possible changes in the design. We show advanced plans to make a prototype of an entirely spherical triple-GEM detector, including a spherical readout structure. This detector will have a superior position resolution, also at wide diffraction angles, and a high rate capability. A completely spherical gaseous detector has never been made before.
Alfonsi Matteo
Brock Ian
Croci Gabriele
David Eric
Oliveira Rui de
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