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

Research output: Contribution to journalArticle

22 Citations (Scopus)

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 languageEnglish
Pages (from-to)413-415
Number of pages3
JournalReview of Scientific Instruments
Volume66
Issue number1
DOIs
Publication statusPublished - Dec 1 1995

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Cyclotrons
Radiometers
radiometers
cyclotrons
Electrons
Electron temperature
sidebands
Frequency bands
Signal to noise ratio
signal to noise ratios
electrons
Photons
receivers
spatial resolution
electron energy
bandwidth
Bandwidth
harmonics
photons
Temperature

All Science Journal Classification (ASJC) codes

  • Instrumentation

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Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U. / Isei, N.; Sato, M.; Ishida, S.; Uchino, K.; Nagashima, A.; Matoba, T.; Oyevaar, T.

In: Review of Scientific Instruments, Vol. 66, No. 1, 01.12.1995, p. 413-415.

Research output: Contribution to journalArticle

Isei, N. ; Sato, M. ; Ishida, S. ; Uchino, K. ; Nagashima, A. ; Matoba, T. ; Oyevaar, T. / Development of 180 GHz heterodyne radiometer for electron cyclotron emission measurements in JT-60U. In: Review of Scientific Instruments. 1995 ; Vol. 66, No. 1. pp. 413-415.
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AU - Matoba, T.

AU - Oyevaar, T.

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