Impact of Single-Mask Hole Asymmetry on the Properties of GEM Detectors

Abstract

A single-mask Gas Electron Multiplier (GEM) technique overcomes the cumbersome practice of alignment of two masks and allows the production of foils with very large area as needed for the CMS muon forward region upgrade. However, the holes obtained with refinements in the single-mask technique are asymmetrically bi-conical in shape compared to symmetrically bi-conical holes of double-mask technology. The hole geometry and their uniformity define the performance of the detectors which are constructed with such GEM foils. To evaluate the effect of this asymmetry, the foils have been characterized experimentally using a special prototype with three single-mask GEM foils. The structure allowed to change the orientation of foils, testing from above with foils having a large hole opening, testing from the bottom with all the foils having small hole opening. The effective gain, energy resolution and the charging up behavior are compared for the two different hole orientations.

arXiv comment6 pages, 5 figures

References in corpus (2)

• Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Large non-Gaussian Halo Bias from Single Field Inflation

Cited by in corpus (8)

• Performance of prototype GE1/1 chambers for the CMS muon spectrometer upgrade
• Study of charging-up effect for a single mask triple GEM detector
• Oscillatory magnetic fields for neutron resonance spin-echo spectroscopy
• Effect of hole geometry on charge sharing and other parameters in GEM-based detectors
• Hole Misalignment and Gain Performance of Gaseous Electron Multipliers
• MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA
• Comparative study on charging-up of single, double and triple Gas Electron Multipliers (GEM)
• The Qualification of GEM detector and its application to Imaging