We have constructed a test facility for characterizing the focal plane arrays of SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. SAFARI's three bolometer arrays are populated with extremely sensitive (NEP similar to 2 x 10(-19) W/root Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (similar to 4 fW) of SAFARI's detectors present challenges to characterizing them. In optimizing the SAFARI Detector System Test Facility we have paid careful attention to stray-light exclusion as well as electrical, magnetic, and mechanical isolation. We present measurements verifying the facility's performance and analyze them in terms of a two-fluid model of the TES current on the transition to investigate the background power level. We have measured a detector NEP of (5.1 +/- 0.4) x 10(-19) WHz(-1/2), showing that the facility is ready to test the SAFARI prototype arrays and is approaching the performance needed for testing the flight arrays.
|Tijdschrift||Journal of Low Temperature Physics|
|Nummer van het tijdschrift||3-4|
|Status||Published - mei-2012|
|Evenement||14th International Workshop on Low Temperature Particle Detection (LTD) - , Germany|
Duur: 1-aug-2011 → 5-aug-2011