title: A 60-GHz interferometer with a local oscillator integrated antenna array for divertor simulation experiments on GAMMA 10/PDX.
abstract: In conventional multichannel/imaging microwave diagnostics of interferometry, reflectometry, and electron cyclotron emission measurements, a local oscillator (LO) signal is commonly supplied to a receiver array via irradiation using LO optics. In this work, we present a 60-GHz interferometer with a new eight-channel receiver array, called a local oscillator integrated antenna array (LIA). An outstanding feature of LIA is that it incorporates a frequency quadrupler integrated circuit for LO supply to each channel. This enables simple and uniform LO supply to the receiver array using only a 15-GHz LO source and a coaxial cable transmission line instead of using an expensive 60-GHz source, LO optics, and a waveguide transmission line. The new interferometer system is first applied to measure electron line-averaged density inside the divertor simulation experimental module (D-module) on GAMMA 10/PDX tandem mirror device.
authors.affiliation: Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Kohagura
authors.affiliation: Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoshikawa
authors.affiliation: Saitama University, Saitama 338-8570, Japan.
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.affiliation: Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Kuwahara
authors.affiliation: National Institute of Technology, Ube College, Ube, Yamaguchi 755-8555, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ito
authors.affiliation: National Institute of Fusion Science, Toki, Gifu 509-5292, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagayama
authors.affiliation: Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Shima
authors.affiliation: Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nojiri
authors.affiliation: Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sakamoto
authors.affiliation: Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nakashima
authors.affiliation: Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Mase