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Development of a New 2-beam 100-GHz Band Receiver and Release for Open Use (the first beam is released in the 2012-2013 semester)

Dr. Nakajima and collaborators have developed a two-beam waveguide-type dual-polarization sideband-separating SIS receiver system in the 100-GHz band for z-machine on the 45-m radio telescope at the Nobeyama Radio Observatory. The reciever is intended for astronomical use in searching for highly redshifted spectral lines from galaxies of unknown redshift.
This receiver has two beams and allows for observations with the switch in the on-on position. The receiver of each beam is composed of an ortho-mode transducer and two sideband-separating SIS mixers, which are both based on a waveguide technique. The new receiver system was installed in the telescope, and we successfully observed a CO emission line toward a cloverleaf quasar at z = 2.56 on December 2011. From January 2013, we have released the first beam of this receiver for the open use of 45-m telescope.
The details of this receiver specification and the ortho-mode transducer are described in Nakajima et al., 125, 252 (2013) and Asayama & Nakajima, 125, 213 (2013) Both papers are published in Publications of the Astronomical Society of the Pacific.
This work was supported in part by a Grant-in-Aid for Specially Promoted Research (20001003) and by a Grant-in-Aid for Young Scientists (B) (22740126) from JSPS.

Figure. Photograph of the receiver system in the receiver cabin of the telescope.