Side-On transition radiation detector (TRD) based on THGEM

The characteristic that TR energy is proportional to the Lorentz factor provides a way for energy calibration. The High Energy cosmic-Radiation Detection calorimeter can be calibrated in space by the TRD in the future. In order to make the TR signal stand out from the energy loss signal, a new prototype of TRD called Side-On TRD with THGEM has been built. Side-on TRD uses side window incidence and strip readout to reduce the ionization energy registered in the channel where the TR photons are located, which is supposed to improve the detection efficiency of TR. The Side-On TRD has been tested at CERN SPS and found the experimental results are significant.