HGTD PEB DC/DC Power Block in Low Temperature and Magnetic Field Operation

The High Granularity Timing Detector (HGTD) is an ATLAS Phase II upgrade project, the goal of which is to provide accurate time measurements for tracks to mitigate pile-up effect. DC/DC converters, BPOL12V, are implemented in the Peripheral Electronic Boards (PEB) and used to generate voltages for a bunch of ASICs. Due to the working environment constraints of HGTD, the BPOL12V will be operated in low temperature and under magnetic field. Therefore, it is essential to perform a comprehensive study of BPOL12V under different operation conditions. This report will present such study, including the BPOL12V efficiency, ripple and so on.