Making spherical GEMs

Pinto, S. Duarte; Villa, M.; Alfonsi, M.; Brock, I.; Croci, G.; David, E.; Oliveira, Rui de; Ropelewski, L.; Stenis, M. van; Taureg, H.

doi:10.1088/1748-0221/4/12/p12006

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…A curved chamber with 1-D readout was made to provide a parallax-error-free [8] X-ray diffraction spectrometer for station 1W1A of the Beijing Synchrotron Radiation Facility (BSRF). The X-ray energy of the 1W1A station is 8.05 keV and 13.5 keV, and the 8.05 keV X-ray intensity is higher than 10 11 photons/s.…”

Section: Applications For X-ray Diffractionmentioning

confidence: 99%

A study of thinner-THGEM, with some applications

Liu¹,

Liu²,

Chen³

et al. 2012

J. Inst.

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THGEMs (THick Gas Electron Multiplier) of varying thickness, hole diameter and hole pitch have been studied. For a thinner-THGEM of thickness 0.2 mm, with hole diameter 0.2 mm, pitch 0.2 mm and narrow (5-10 μm) rim, the performance of gain versus high voltage with different gas mixtures have been studied using 5.9 keV X-rays. In general, a gain of around 3×10 3 was obtained with a single board in Ar/iC 4 H 10, and gains higher than 10 4 were obtained in Ne mixture at lower voltage. The dependence of the energy resolution on the drift and induction electric fields was measured and an energy resolution of 15.9% was obtained. A curved thinner-THGEM chamber with one-dimensional readout has been assembled for use in the diffraction studies at the Beijing Synchrotron Radiation Facility (BSRF). A cosmic-ray muon hodoscope based on thinner-THGEM was developed as a teaching experiment for the Graduate University of the Chinese Academy of Sciences (GUCAS).

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Section: Applications For X-ray Diffractionmentioning

confidence: 99%

A study of thinner-THGEM, with some applications

Liu¹,

Liu²,

Chen³

et al. 2012

J. Inst.

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“…Also interesting is the development of cylindrical gem [26] and Micromegas [27] detectors for inner barrel tracking. A recent development is the introduction of spherical gems [28] for parallax-free x-ray diffraction measurements.…”

Section: A Organizationmentioning

confidence: 99%

Micropattern gas detector technologies and applications the work of the RD51 collaboration

Pinto

2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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on behalf of the collaboration.Abstract-The RD51 collaboration was founded in April 2008 to coordinate and facilitate efforts for development of micropattern gaseous detectors (mpgds). The 75 institutes from 25 countries bundle their effort, experience and resources to develop these emerging micropattern technologies.Mpgds are already employed in several nuclear and high-energy physics experiments, medical imaging instruments and photodetection applications; many more applications are foreseen. They outperform traditional wire chambers in terms of rate capability, time and position resolution, granularity, stability and radiation hardness. RD51 supports efforts to make mpgds also suitable for large areas, increase cost-efficiency, develop portable detectors and improve ease-of-use.The collaboration is organized in working groups which develop detectors with new geometries, study and simulate their properties, and design optimized electronics. Among the common supported projects are creation of test infrastructure such as beam test and irradiation facilities, and the production workshop.

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“…A detailed description of the method with which spherical gems are made can be found in [11], [12], here we only give an overview. For the manufacturing of a spherical gem we start with a flat gem foil.…”

Section: Making Spherical Gems and Other Componentsmentioning

confidence: 99%

First results of spherical GEMS

Pinto

Alfonsi

Brock

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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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.

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Making spherical GEMs

Cited by 9 publications

References 12 publications

A study of thinner-THGEM, with some applications

A study of thinner-THGEM, with some applications

Micropattern gas detector technologies and applications the work of the RD51 collaboration

First results of spherical GEMS

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