A high-temperature superconducting millimeter wave detecting system based on pulse tube cryocooler

Jian Chen; Peiheng Wu; Kensuke Nakajima; Tsutomu Yamashita

doi:10.1117/12.552448

8 October 2004 A high-temperature superconducting millimeter wave detecting system based on pulse tube cryocooler

Jian Chen, Peiheng Wu, Kensuke Nakajima, Tsutomu Yamashita

Proceedings Volume 5498, Millimeter and Submillimeter Detectors for Astronomy II; (2004) https://doi.org/10.1117/12.552448
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

A millimeter (mm) wave broadband video detecting system using high temperature superconducting (HTS) junction and compact pulse tube cryocooler (PTC) has been studied. The lowest attainable temperature of the PTC is 42K and the operating temperature (T) can be adjusted by changing the pressure difference in the compressor. By measuring the linewidth of the Josephson oscillation as well as the dynamic range of the Josephson detector, it is found that the PTC has no excess noise compared with other kinds of cryostats such as liquid helium cryostats, and is very suitable for the applications in the mm wave detecting system. Furthermore, to improve the sensitivity of the system, the coupling efficiency of the system has been studied in detail. It is found that the coupling efficiency increases with the increase of RN linearly, and is better than 1% for RN of 1.7 Ohm. A sensitivity of about 318V/W has been obtained for the system based on the PTC and a junction with RN=1.7 Ohm and ICRN =1mV.

Citation Download Citation

Jian Chen, Peiheng Wu, Kensuke Nakajima, and Tsutomu Yamashita "A high-temperature superconducting millimeter wave detecting system based on pulse tube cryocooler", Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); https://doi.org/10.1117/12.552448

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