A plan of receiver development for ASTE/MLSA

摘要

We present a plan of heterodyne receivers for Atacama Submillimeter Telescope Expeirment ASTE), which is one of Japanese R&D project of Large Millimeter Submilimeter Array (LMSA) and Atacmam Large Millimeter Array (ALMA). A new 10 m submillimeter-wave telescope has been pre-installed at Noberymama since February 2000 and will be installed at Pamapa la Bola (el. 4800m) in northern Chile. The telescope has four receiver layouts: (1)1 A shaped Cassegrain optics was designed for the Nobeynama operaton to achieve high beam-efficiency at millimeter-wave bands. (2) Normal gaussian optics will be replaced for the Chile operationto optimize submillimeter-wave bands up to 850 GHz. (3) It is possible to install an ALMA prottype receiver at the focus of secondary eflector. (4) an optics for submillimeter SIS photon camera. We describe the 350 GHz reciever which noise temperature was around 55 K in the frequency band of 330-360 GHz. The temperature ripple at the 4K stage of two stages Gifford-McMahon refrigerator has been reduced to be less than 10 mK by employing a He-pot temperature stabilizer.