Figure 4
The 3 × 2 Keck-PAD array in a vacuum housing with the front window removed to show front-end electronics extending from the sides of the detector modules. During operation, the detector array and front-end electronics are held in vacuum and the temperature of the hybrid modules is actively regulated by a thermoelectric cooler to ±0.1 K in the 253–243 K range. Transfer of heat from the detector head is performed by water-cooling lines held at 283–288 K. An FPGA development board is integrated into the detector head for configurable detector control. |