Simulation of gain stability of THGEM gas-avalanche particle detectors

P. M.M. Correia, M. Pitt, C. D.R. Azevedo, A. Breskin, S. Bressler, C. A.B. Oliveira, A. L.M. Silva, R. Veenhof, J. F.C.A. Veloso

Research output: Contribution to journalArticlepeer-review


Charging-up processes affecting gain stability in Thick Gas Electron Multipliers (THGEM) were studied with a dedicated simulation toolkit. Integrated with Garfield++, it provides an effective platform for systematic phenomenological studies of charging-up processes in MPGD detectors. We describe the simulation tool and the fine-tuning of the step-size required for the algorithm convergence, in relation to physical parameters. Simulation results of gain stability over time in THGEM detectors are presented, exploring the role of electrode-thickness and applied voltage on its evolution. The results show that the total amount of irradiated charge through electrode's hole needed for reaching gain stabilization is in the range of tens to hundreds of pC, depending on the detector geometry and operational voltage. These results are in agreement with experimental observations presented previously.

Original languageAmerican English
Article numberP01015
Number of pages12
JournalJournal of Instrumentation
Issue number1
StatePublished - 1 Jan 2018


  • Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc)
  • Micropattern gaseous detectors (MSGC,GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc)

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Mathematical Physics


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