19 July 2016 Development of the new multi-beam 100 GHz band SIS receiver FOREST for the Nobeyama 45-m Telescope
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Abstract
We report the development of the new 4-beam, 2-polarization, 2-sideband, 100 GHz band SIS receiver "FOREST" (FOur beam REceiver System on the 45-m Telescope) and the results from commissioning and observations on the Nobeyama 45-m Telescope operated by Nobeyama Radio Observatory, a branch of National Astronomical Observatory of Japan. FOREST aims to add new capabilities of large-area mapping and simultaneous multi-line observation at 80 { 116 GHz band to the Nobeyama 45-m Telescope, which is one of the largest millimeter radio telescopes in the world. The configuration of the four beams is a quadrate of 2 x 2 with the separation between adjacent beams of 50". Beam size of each beam is ~ 15" at 115 GHz. Receiver noise temperature is as low as that of ALMA Band 3 receivers, so that mapping speed is more than four times as high as that of the other 100 GHz band receivers on the 45-m Telescope. The IF bandwidth is 8 GHz (4 { 12 GHz) realizing simultaneous 12CO(J = 1-0), 13CO(J = 1-0), and C18O(J = 1-0) observations. Cooled components inside of cryostat are modularized per beam. IF signals from the cryostat are processed by the room temperature IF system, and then passed to spectrometers. We have installed the FOREST receiver into the Nobeyama 45-m Telescope, evaluated its performance, and made large area mapping observations. These demonstrate the excellent performance of the FOREST receiver and the Nobeyama 45-m Telescope.
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Tetsuhiro Minamidani, Tetsuhiro Minamidani, Atsushi Nishimura, Atsushi Nishimura, Yusuke Miyamoto, Yusuke Miyamoto, Hiroyuki Kaneko, Hiroyuki Kaneko, Hiroyuki Iwashita, Hiroyuki Iwashita, Chieko Miyazawa, Chieko Miyazawa, Hiroyuki Nishitani, Hiroyuki Nishitani, Takuya Wada, Takuya Wada, Yasunori Fujii, Yasunori Fujii, Toshikazu Takahashi, Toshikazu Takahashi, Yoshizo Iizuka, Yoshizo Iizuka, Hideo Ogawa, Hideo Ogawa, Kimihiro Kimura, Kimihiro Kimura, Yuto Kozuki, Yuto Kozuki, Yutaka Hasegawa, Yutaka Hasegawa, Mitsuhiro Matsuo, Mitsuhiro Matsuo, Shinji Fujita, Shinji Fujita, Satoshi Ohashi, Satoshi Ohashi, Kana Morokuma-Matsui, Kana Morokuma-Matsui, Jun Maekawa, Jun Maekawa, Kazuyuki Muraoka, Kazuyuki Muraoka, Taku Nakajima, Taku Nakajima, Tomofumi Umemoto, Tomofumi Umemoto, Kazuo Sorai, Kazuo Sorai, Fumitaka Nakamura, Fumitaka Nakamura, Nario Kuno, Nario Kuno, Masao Saito, Masao Saito, "Development of the new multi-beam 100 GHz band SIS receiver FOREST for the Nobeyama 45-m Telescope", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99141Z (19 July 2016); doi: 10.1117/12.2232137; https://doi.org/10.1117/12.2232137
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