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GRID-02
GRID-02 is part of GRID, a constellation of transient gamma-ray detectors. It was launched on 06/Nov/2020 at an orbit of 457 × 467 km 97.2$^{\circ}$ LEO.
References
Ground Characterization Studies
In-Orbit Characterization Studies
Setup and Methods
In addition to the optimization of the GRID detector, several functions are specifically designed for performance studies of SiPMs. The current, bias voltage and temperature of the SiPMs are monitored. A charge injection module is used to analyze the noise contributions.
The detector is subdivided into 4 channels, later referred to as CH0 - CH3. Each channel is comprised of of a scintillator crystal and a 4 × 4 array of MicroFJ-60035-TSV1 SiPMs. Furthermore, each channel has its own bias voltage power supply, readout electronics and dedicated SiPM characterization circuits.
Every second, during scientific observations, the bias voltage, current and temperature are recorded as housekeeping data. They are later used to analyze the SiPM dark current. A special trigger initiates IV measurements of the SiPM at 40 different bias voltages (above and below V$_{bd}$).