A large-area GEM detector using a novel self-stretching technique

You, W.; Zhou, Yi; Li, Cheng; Chen, Hongfang; Shao, M.; Sun, Y. J.; Tang, Z.; Liu, Jianbei

doi:10.1088/1674-1137/39/4/046001

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…So that we measure the gain of the detector every second pad to reduce the test time. Test results show that the uniformity is better than 20% which is consistent with the former result [20].…”

Section: X-ray Testsupporting

confidence: 90%

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Readout Electronics for CEPC Semidigital Hadron Calorimeter Preprototype

Wang

Liu

Feng

et al. 2019

IEEE Trans. Nucl. Sci.

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CEPC (Circular Electron and Positron Collider) is a large experiment facility proposed by Chinese particle physics community. One of its running option is being the Higgs factory. Calorimeter is the main part of this experiment to measure the jet energy. Semi-digital hadron calorimeter (SDHCAL) is one of the options for the hadron measurement. GEM detector with its high position resolution and flexible configuration is one of the candidates for the active layer of the SDHCAL. The main purpose of this paper is to provide a feasible readout method for the GEMbased semi-digital hadron calorimeter. A small-scale prototype is designed and implemented, including front-end board (FEB) and data interface board (DIF). The prototype electronics has been tested. The equivalent RMS noise of all channels is below 0.35fC. The dynamic range is up to 500fC and the gain variation is less than 1%. The readout electronics is applied on a doublelayer GEM detector with 1cm×1cm readout pad. Result indicates that the electronics works well with the detector. The detection efficiency of MIP is over 95% with 5fC threshold.

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Section: X-ray Testsupporting

confidence: 90%

“…By measuring the full energy peak of the readout pads, the gain of the detector can be evaluated. As measured in the former test [20], the gain would not change rapidly in a small area. So that we measure the gain of the detector every second pad to reduce the test time.…”

Section: X-ray Testmentioning

confidence: 73%

Readout Electronics for CEPC Semidigital Hadron Calorimeter Preprototype

Wang

Liu

Feng

et al. 2019

IEEE Trans. Nucl. Sci.

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“…In this work, all the measurements were carried out on the triple-GEM detector built using the 30 × 30 cm 2 single mask GEM foils. The detector have been assembled using a self-stretching technique known as "No Stretch, No Stress (NS2)" technique [13,14] to stretch the GEM foils. The three GEMs were sandwiched between the Drift and readout board surrounded by the gas frame made of epoxy for the gas tightness.…”

Section: Triple-gem Detector and Experimental Set-upmentioning

confidence: 99%

Development and qualification of triple-GEM detector built with large size single mask foils produced in India

et al. 2020

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The Gas Electron Multiplier (GEM) is the new age detector for nuclear and particle physics experiments, which was first developed by the European Center for Nuclear Research (CERN). It is comprised of an excellent insulator (Kapton/Apical) having a thickness of 50 µm which is covered with 5 µm copper layer on both sides and pierced by a regular array of holes. From its invention, CERN has been the sole supplier of the GEM foils until recently when few private companies started manufacturing GEM foils under the transfer of technology (TOT) from CERN. However, it's a long process to validate the foils delivered by these companies to claim that the GEM detectors made from them are compatible with high scientific standards. Along these lines, an India based company Micropack Pvt. Ltd. began fabricating both double and single mask GEM foils; at first Micropack produced 10 × 10 cm 2 double mask foils which were tested both at foil and detector level by University of Delhi (DU) and it was confirmed to satisfy the required standards. Because of the double mask technique, the size of the GEM foil was constantly constrained so to overcome the confinement in size of GEM foils the single mask technique was developed in 2010. Micropack produced the first batch of 30 × 30 cm 2 single mask foils in a joint effort with DU. A triple-GEM detector was constructed using these foils to test the fundamental quality controls, which include effective gain measurement, energy spectrum, and gain uniformity. Along with this, we will also report on the few advance studies which include discharge probability, rate capability, and charging up for this detector and foils.

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“…Several middle-size GEM prototypes were constructed and tested successfully in our laboratory, by using the self-stretching technique [5]. In the following parts the efforts to build even larger GEM (∼ 1 meter) will be described, including the problems we met when constructing large size detector and the adaption of improved self-stretching method to overcome the difficulties.…”

Section: Introductionmentioning

confidence: 99%