Physics & Astronomy Faculty and Staff Publications

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We have recently developed a scanning optical pulser for the precise measurement of device-to-device reproducibility, position-dependent response, and other important characteristics of low-temperature particle detectors. By making maps of the reflected light, we can measure the position of the detectors (mounted on the ADR) under the scanner (mounted on the 3K flange) to micro-meter precision . We find that the detector position typically changes approximately 3-4 μm from ADR regeneration to ADR regeneration . Further, when the ADR is allowed to warm at zero field over many hours from its base temperature to approximately 1 K, an additional change in the measured position of approximately 10 μm is seen. The origin of these position shifts is unknown. One candidate mechanism is the slow relaxation of mechanical stress in the fiber suspension of the ADR. For best precision in positioning the scanning pulser it would be useful to reduce or eliminate these position shifts. We have recently fabricated a new rigid suspension for our ADR based on the stacked-sapphire disk approach that was successfully used in SCUBA-II. In this report we describe the design and initial performance testing of this new suspension.

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15th International Workshop on Low-Temperature Detectors



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