Journal Article

GSI-2023-00333

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Systematic investigation of critical charge limits in Thick GEMs

Gasik, P. (Corresponding author)GSI* ; Lautner, L. (Corresponding author)TUM* ; Fabbietti, L.TUM* ; Fribert, H.TUM* ; Klemenz, T.TUM* ; Mathis, A.TUM* ; Ulukutlu, B.TUM* ; Waldmann, T.TUM*

2023
North-Holland Publ. Co. Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.nima.2022.167730  doi:10.15120/GSI-2023-00333

Report No.: arXiv:2204.02853

Abstract: We present discharge probability studies performed with a single Thick Gas Electron Multiplier (THGEM) irradiated with alpha particles in Ar-CO$_2$ and Ne-CO$_2$ mixtures. We observe a clear dependency of the discharge stability on the noble gas and quencher content pointing to lighter gases being more stable against the development of streamer discharges. A detailed comparison of the measurements with Geant4 simulations allowed us to extract the critical charge value leading to the formation of a spark in a THGEM hole, which is found to be within the range of 3-7×10$^6$ electrons, depending on the gas mixture.Our experimental findings are compared to previous GEM results. We show that the discharge probability of THGEMs exceeds the one measured with GEMs by orders of magnitude. This can be explained with simple geometrical considerations, where primary ionization is collected by a lower number of holes available in a THGEM structure, reaching higher primary charge densities and thus increasing the probability of a spark occurrence. However, we show that the critical charge limits are similar for both amplification structures.

Note: ccby4, grant number DFG FA 898/5-1

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Contributing Institute(s):

1. Publikationen des Stabes Forschung FAIR & GSI (REDpub)
2. CBM (CBM)

Research Program(s):

1. 622 - Detector Technologies and Systems (POF4-622) (POF4-622)

Experiment(s):

1. External experiment at external facility/ no experiment at GSI (other)

Appears in the scientific report 2023

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