Squid Readout of Cryogenic Particle Detectors
| Autor: | Hamster, A.W., van Duuren, M.J., Brons, G.C.S., Flokstra, J., Rogalla, H., van den Berg, A., Bergveld, P. |
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| Rok vydání: | 1998 |
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| Zdroj: | Sensor Technology in the Netherlands: State of the Art ISBN: 9789401061032 Sensor technology in the Netherlands-state of the art: proceedings of the Dutch Sensor Conference, 2-3 March, 1998, University of Twente, the Netherlands, 281-285 STARTPAGE=281;ENDPAGE=285;TITLE=Sensor technology in the Netherlands-state of the art |
| Popis: | Cryogenic radiation and particle detectors are widely investigated nowadays. Their high intrinsic energy sensitivity makes them suitable for a wide range of applications. In order to take full advantage of the sensitivity of these newly developed cryogenic detectors, in general current sensors are needed with a white noise level of the order of 10-12 A/√HZ and a bandwidth larger than 1 MHz. We applied a Double Relaxation Oscillation SQUID (DROS) as a low-noise current preamplifier for measuring the current-voltage characteristics of a superconducting Nb/Al-AlOx/Al/Nb Josephson tunnel junction. A white current noise level smaller than 2 pA/√Hz was obtained. Thanks to the large flux-to-voltage transfer of a DROS (typically 1 mV/Ø o), no modulation techniques are required, allowing simple room-temperature flux locked loop electronics. Since the Josephson junction was voltage biased, no magnetic field had to be applied to suppress the Josephson supercurrent, which eliminates distortion of the subgap I-V characteristics by Fiske resonances. The measurements show that a DROS is a serious alternative for the high resolution readout of an X-ray spectrometer based on a superconducting tunnel junction. |
| Databáze: | OpenAIRE |
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