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

J. Chen, P. H. Wu, Koji Nakajima, T. Yamashita

Research output: Contribution to journalConference articlepeer-review


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 1.7Ω. A sensitivity of about 318V/W has been obtained for the system based on the PTC and a junction with R N=1.7Ω and ICRN =lmV.

Original languageEnglish
Article number97
Pages (from-to)796-801
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2004 Dec 1
EventMillimeter and Submillimeter Detectors for Astronomy II - Glasgow, United Kingdom
Duration: 2004 Jun 232004 Jun 25


  • Broadband video detecting system
  • High temperature superconducting junction
  • Millimeter wave
  • Pulse tube cryocooler

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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