Workshop on Advanced Radiation Detector and Instrumentation in Nuclear and Particle Physics (Online)

Charging up effect in triple GEM detector

25 Oct 2021, 10:50

20m

Online (University of Jammu)

Talk Micro-Pattern Gas Detectors in Particle Physics Oral presentations

Speaker

Mr Sayak Chatterjee (Bose Institute)

Description

Micro Pattern Gaseous Detectors (MPGD) are being used in High Energy Nuclear Physics experiments as a tracking device due to its high rate handling capability and good spatial resolution. Gas Electron Multiplier (GEM) detector is one of the advanced members of the MPGD group which is capable of handling high particle rate (∼ 1 MHz/mm${}^2$ ) and has excellent position resolution (∼ 100 µm). The standard GEM foil is made up of a thin Kapton of thickness 50 µm with 5 µm copper cladding on both sides of the foil. The presence of di-electric (Kapton) changes the electric field strength of the electric field inside the GEM holes under the influence of external radiation and this phenomenon is referred to as the charging up effect. As a result of the charging up effect, the gain of the chamber increases initially and then asymptotically reaches a constant value.

The charging up effect is investigated for a Single Mask triple GEM detector prototype with Argon-CO${}_2$ gas mixture under continuous irradiation from an X-ray source. The method of measurements and the test results will be presented.

Presentation materials

s_chatterjee_RAPID_GEM_charging_up.pdf