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.
@article{arxiv.0909.3544,
title = {Making spherical GEMs},
author = {Serge Duarte Pinto and Marco Villa and Matteo Alfonsi and Ian Brock and Gabriele Croci and Eric David and Rui de Oliveira and Leszek Ropelewski and Miranda van Stenis and Hans Taureg},
journal= {arXiv preprint arXiv:0909.3544},
year = {2009}
}
Comments
Contribution to the proceedings of the MPGD'09 conference, Crete