Speaker
Description
The VLAST-P (Very Large Area gamma-ray Space Telescope-Pathfinder) is a miniaturized space detector designed to detect high-energy gamma-rays from the Sun (in the MeV to GeV energy range), as well as high-energy protons from solar flares. The CsI(Tl) calorimeter is a crucial part of the VLAST-P payload for measuring the energy of incoming high-energy photons and providing the hit information from cosmic rays within the calorimeter for the trigger selection of effective events. An electronics system consisting of 4 FEEs (Front End Electronics) modules and 1 PAM (Pre-Amplifier Module) with a total power consumption of about 22 W, has been developed. Signals from the Avalanche photodiodes (APD) are amplified and shaped by CSA (Charge Sensitive Amplifier), then split into high and low electronics gains to achieve a large dynamic range. The FEEs digitize analog signals from a total 100 channels, transmits the scientific data to the payload electronics control unit, and provides hit signal translation. To assure long-term reliability in the harsh space environment, radiation hardness, thermal design, components and board level quality control were carefully considered. In addition, the key indexes of energy linearity, noise level, and dynamic range were preliminarily studied. Test results showed that the system level ENC (Equivalent Noise Charge) for each high-gain channel is below 4 fC, and the linear measurement upper limit of each low-gain channel reaches about 100 pC, both of which meet the physical requirements of the detector.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | Yes |