Preliminary Design of Pulse Digitalization and Readout Electronics for CDEX-10

Abstract

Abstract CDEX (China Dark Matter Experiment) is now planning to be upgraded to about 10 Kg HPGe (High Purity Germanium) detectors (CDEX-10) and the new suitable dedicated pulse digitizer and readout electronics are on demand. The readout system is interfaced to the front preamplifiers, which has two “slow” outputs with typical 6-μs shaping time and two “fast” output with typical 300-ns shaping time. In this preliminary design of pulse digitalization and readout electronics, 8-channel 14-Bit 100 MSPS ADC (Analog-to-Digital Converter) and 4-channel 12-Bit 1 GSPS ADC are embedded in the 6U-size readout prototype board. The RAIN1000Z1 readout module based on ZYNQ SoC (System on Chip) is used for readout with Gigabit Ethernet. The ENOB (Effective Number Of Bits) of ADC and the TCP data throughput of Gigabit Ethernet will be discussed. The preliminary result of gamma-ray spectrum will also be presented.