The High Reliable Control Logic for Plastic Scintillator Array Detector of Dark Matter Particle Explorer
Abstract
As one of the payloads of the Dark Matter Particle Explorer (DAMPE) satellite, the new type of plastic scintillator array detector developed by Institute of Modern Physics, Chinese Academy of Sciences (CAS) has two main tasks: first one is to distinguish high energy photons and electrons in near-earth space, second one is to measures the charge of high energy particles with the charge number of 1 26.All these functions are implemented by four front end readout circuit boards, each board contains one FPGA which is configured a set of high reliable control logic developed by us. The control logic is not only used to control multiple ASIC, ADC, DAC chips on front end readout circuit boards to achieve the operations of signal sampling, processing, data caching, and data transmission with upper payload manager which is inspired by valid triggers from trigger generator system, but also to configure, self-calibrate and monitor the whole detector system when received commands from earth.In order to acquire mass reliable particle information with detector in complex electromagnetic radiation environment for a long time, many effective error checking and correcting methods such as odd parity check, accumulate check, CRC check, double backup for the key modules are applied in the control logic. Especially, we design a new TMR error correct solution for RAM to recover some error key parameters from single event upset. When reading key parameters from three backed up RAMs to every raw data processing, the control logic compares three same address bytes at the same time, if it checks out that the value in one byte is different from other two bytes, control logic will update the byte with other two byte's value and then rewrite them to three RAMs using the same address. The satellite was launched at the end of 2015, it has been discriminated over 2.8 billion high-energy particles and completed the energy spectrum of particles with the atomic number of 1 26 in space up to now. It still works well.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E1483H