Study on temperature response of the HERD calorimeter cell

Purpose To derive the temperature response of the basic unit of the electromagnetic calorimeter of the high energy cosmic-radiation detection (HERD) facility.Method Tested a method to measure HERD calorimeter cell (HCC) light yield using an ultraviolet Light-Emitting Diode with a wavelength of 300 nm, and established an experimental setup and tested the light yield of the HCC at different temperatures in a thermal chamber.Results and conclusions The result showed that the signal amplitudes variation of the HCC reached up to 10.2% with temperature ranging from 0 to 60 °C, if we narrow the temperature range to 0-35 °C, the variation was about 3.7% and it showed much better linearity. This result provides a good instruction on the thermal control of the HERD calorimeter (CALO) to improve its performance.