p/π ⁺ response of single layer THGEM detector in Ar+3% iC ₄ H ₁₀

Abstract

Abstract:In this work, we study the response of a single layer Thick Gaseous Electron Multiplier (THGEM) detector to p/π + at the E3 line of the Beijing Test Beam Facility. The THGEM detector drift gap used in this study is 4 mm, and the gain of the detector operated in Ar+3% iC 4 H 10 is about 2000. p/π + particles at momenta between 500 MeV/c and 1000 MeV/c are distinguished by a Time Of Flight (TOF) system. Results show that at the measured momenta, detection efficiencies for p are from 93% to 99%, and for π + in the range of 82%∼88%. Meanwhile, simple Geant4 simulations also have been done, and are consistent with the amplitude spectra of beam test results. We preliminarily study the feasibility of the THGEM detector as sampling element for a Digital Hadronic Calorimeter (DHCAL), which may provide support for a THGEM detector possibly being applied in the Circular Electron Positron Collider (CEPC) HCAL.