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
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

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