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 can be formed. This eliminates the parallax error for detection of x-rays, neutrons or uv photons when a gaseous converter is used. This parallax error limits the spatial resolution at wide scattering angles. Besides spherical gems, we have developed curved spacers to maintain accurate spacing, and a conical field cage to prevent edge distortion of the radial drift field up to the limit of the angular acceptance of the detector. With these components first tests are done in a setup with a spherical entrance window but a planar readout structure; results will be presented and discussed. A flat readout structure poses difficulties, however. Therefore we will show advanced plans to make a prototype of an entirely spherical double-gem detector, including a spherical 2d readout structure. This detector will have a superior position resolution, also at wide angles, and a high rate capability. © 2010 IEEE.

Pinto, S., Alfonsi, M., Brock, I., Croci, G., David, E., De Oliveira, R., et al. (2010). First results of spherical GEMS. Intervento presentato a: IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 30 October - 6 November, Knoxville, Tennessee, Usa [10.1109/NSSMIC.2010.5874100].

First results of spherical GEMS

CROCI, GABRIELE;
2010

Abstract

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 can be formed. This eliminates the parallax error for detection of x-rays, neutrons or uv photons when a gaseous converter is used. This parallax error limits the spatial resolution at wide scattering angles. Besides spherical gems, we have developed curved spacers to maintain accurate spacing, and a conical field cage to prevent edge distortion of the radial drift field up to the limit of the angular acceptance of the detector. With these components first tests are done in a setup with a spherical entrance window but a planar readout structure; results will be presented and discussed. A flat readout structure poses difficulties, however. Therefore we will show advanced plans to make a prototype of an entirely spherical double-gem detector, including a spherical 2d readout structure. This detector will have a superior position resolution, also at wide angles, and a high rate capability. © 2010 IEEE.
paper
Radiation; Nuclear and High Energy Physics; Radiology, Nuclear Medicine and Imaging
English
IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 30 October - 6 November
2010
9781424491063
2010
1877
1880
5874100
none
Pinto, S., Alfonsi, M., Brock, I., Croci, G., David, E., De Oliveira, R., et al. (2010). First results of spherical GEMS. Intervento presentato a: IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 30 October - 6 November, Knoxville, Tennessee, Usa [10.1109/NSSMIC.2010.5874100].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/147622
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