The Development of a Dual Channel SIS Receiver of Trao Telescope
Tóm tắt
We developed a low noise dual channel receiver with 100GHz and 150GHz band, which is used to make the simultaneous observation with two bands. The SIS mixers are used in both bands. The constructed dewar for the receiver has a performance with a vacuum of 10−8torr and a temperature of 4.2K. The receiver noise temperature is 50K(DSB) for 100GHz band and 80K(DSB) for 150GHz band, respectively. In order to achieve the simultaneous observations, the quasioptical system is precisely designed, and also evaluated by measurements in the laboratory. The relative pointing offset between two bands is 3″. We have observed the various sources using the receiver since October 1998.
Từ khóa
Tài liệu tham khảo
S. T. Han, C. H. Lee, H. R. Kim, and D. C. Park, "A 100–GHz band heterodyne SIS receiver for the TRAO telescope" Int. J. of Infrared and Millimeter waves, vol. 17,no. 1, pp. 105–119, 1996.
J. A. Park, S. T. Han, T. S. Kim, K. D. Kim, H. R. Kim, H. S. Chung, S. H. Cho, C. H. Lee, and J. Yang, "A quasioptical system of the dual channel SIS receiver for TRAO telescope" Int. J. of Infrared and Millimeter waves, vol. 10,no. 10, Oct. 1999.
H. Iwashita, K. Sunada, R. Kawabe and J. Inatani, "A fixed tuned SIS receiver for the 150GHz frequency band" NRO Technical Report. No.48, pp. 1–6, 1995.
J. E. Carlstrom, R. L. Plambeck, and D. D. Thornton, "A continuously tunable 65–115–GHz Gunn oscillator" IEEE Trans. MTT vol. MTT-33,no. 7, July 1985.