Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U

N. Isei; M. Sato; S. Ishida; K. Uchino; A. Nagashima; T. Matoba; T. Oyevaar

doi:10.1063/1.1146364

Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U

N. Isei, M. Sato, S. Ishida, K. Uchino, A. Nagashima, T. Matoba, T. Oyevaar

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Abstract

A 12-channel heterodyne radiometer system has been developed to obtain electron temperature with high time and spatial resolution from the electron cyclotron emission (ECE) in JT-60U. Resolutions of a single-sideband-type receiver are (1) Δt∼1 μs and (2) Δf=0.5 GHz. The second harmonic extraordinary mode of ECE is utilized for this system and the frequency band is 176-188 GHz. The noise level of the system is determined by unavoidable photon fluctuations, and the signal-to-noise ratio was measured to be about 50 with a video bandwidth of 100 kHz for a signal temperature above ∼200 eV. Details of the design, the obtained performance, and typical measurements are described.

Original language	English
Pages (from-to)	413-415
Number of pages	3
Journal	Review of Scientific Instruments
Volume	66
Issue number	1
DOIs	https://doi.org/10.1063/1.1146364
Publication status	Published - Dec 1 1995
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1146364

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title = "Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U",

abstract = "A 12-channel heterodyne radiometer system has been developed to obtain electron temperature with high time and spatial resolution from the electron cyclotron emission (ECE) in JT-60U. Resolutions of a single-sideband-type receiver are (1) Δt∼1 μs and (2) Δf=0.5 GHz. The second harmonic extraordinary mode of ECE is utilized for this system and the frequency band is 176-188 GHz. The noise level of the system is determined by unavoidable photon fluctuations, and the signal-to-noise ratio was measured to be about 50 with a video bandwidth of 100 kHz for a signal temperature above ∼200 eV. Details of the design, the obtained performance, and typical measurements are described.",

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T1 - Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U

AU - Isei, N.

AU - Sato, M.

AU - Ishida, S.

AU - Uchino, K.

AU - Nagashima, A.

AU - Matoba, T.

AU - Oyevaar, T.

PY - 1995/12/1

Y1 - 1995/12/1

N2 - A 12-channel heterodyne radiometer system has been developed to obtain electron temperature with high time and spatial resolution from the electron cyclotron emission (ECE) in JT-60U. Resolutions of a single-sideband-type receiver are (1) Δt∼1 μs and (2) Δf=0.5 GHz. The second harmonic extraordinary mode of ECE is utilized for this system and the frequency band is 176-188 GHz. The noise level of the system is determined by unavoidable photon fluctuations, and the signal-to-noise ratio was measured to be about 50 with a video bandwidth of 100 kHz for a signal temperature above ∼200 eV. Details of the design, the obtained performance, and typical measurements are described.

AB - A 12-channel heterodyne radiometer system has been developed to obtain electron temperature with high time and spatial resolution from the electron cyclotron emission (ECE) in JT-60U. Resolutions of a single-sideband-type receiver are (1) Δt∼1 μs and (2) Δf=0.5 GHz. The second harmonic extraordinary mode of ECE is utilized for this system and the frequency band is 176-188 GHz. The noise level of the system is determined by unavoidable photon fluctuations, and the signal-to-noise ratio was measured to be about 50 with a video bandwidth of 100 kHz for a signal temperature above ∼200 eV. Details of the design, the obtained performance, and typical measurements are described.

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Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U

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