Development of a submillimeter-wave camera for the Atacama Submillimeter Telescope Experiment

Details Development of a submillimeter-wave camera for the Atacama Submillimeter Telescope Experiment Development of a submillimeter-wave camera for the Atacama Submillimeter Telescope Experiment

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4015..228m&link_type=abstract

Proc. SPIE Vol. 4015, p. 228-236, Radio Telescopes, Harvey R. Butcher; Ed.

Physics

3

Scientific paper

The Atacama Submillimeter Telescope Experiment (ASTE) is a Japanese development program for the large millimeter and submillimeter array (LMSA/ALMA). The new 10-m submillimeter- wave telescope is a prototype telescope for the LMSA project and to be installed in Chile in 2001. The telescope will be equipped with submillimeter-wave SIS mixer receivers and a submillimeter-wave direct detector camera. The submillimeter- wave camera based on superconducting direct detectors (SIS photon detectors) are under development to realize very wide field observations in submillimeter-wave. Niobium tunnel junctions with low leakage current coupled to antenna structures can be sensitive submillimeter-wave detectors when high quantum efficiency and low leakage current is realized. Inhomogeneous distributed junctions coupled to log-periodic antennas can be used to realize this. Input coupling of more than 50% is calculated using 5-element and 10-element inhomogeneous distributed junctions. With leakage current of less than 100 pA, noise equivalent power can be less than 10-16 W/Hz0.5 under shot noise limited operation. Submillimeter-wave camera of 100 pixels is now under design and will be installed on ASTE 10-m telescope in 2002 or later.

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