The characterization of thick gas electron multiplier (THGEM)

The Thick Gaseous Electron Multiplier (THGEM) is an ionization detector. In this report we have studied the performance of single-mode configuration of THGEM which is designed and fabricated by Indian effort. The gain property of the indigenously made THGEM has been studied using with Ar/CO₂ (90:10) gas mixture at atmospheric pressure. Here Ar is the main detector medium and CO₂ is the quencher gas which is highly electronegative gas. It absorbs photon released by Ar ion and dissipates the energy through elastic collision and also increases the lifetime of the THGEM. Calibration of MFC The gas-mixing has been done existing Mass Flow Controller (MFC) and the calibration was done for Ar and CO₂ gas independently. The cylinder gas pressure of each gas was kept to a fixed value throughout the calibration. These fixed values of pressure for Ar and CO₂ were kept same when the experimental data had been taken. The calibration plots for Ar and CO₂ have been given below