Development of a correlation ECE radiometer for electron temperature fluctuation measurements in Heliotron J

A radial correlation ECE radiometer diagnostic has been developed for electron temperature fluctuation measurements in the helical-axis heliotron device, Heliotron J. The radiometer consists of two heterodyne detection systems. One system scans the frequency of a local oscillator from 52 to 64 GHz w...

Full description

Saved in:
Bibliographic Details
Published in:EPJ Web of conferences 2019-01, Vol.203, p.3013
Main Authors: Weir, Gavin M., Nagasaki, Kazunobu, Zhu, Jinxiang, Luo, Maoyuan, Okada, Hiroyuki, Minami, Takashi, Kado, Shinichiro, Kobayashi, Shinji, Yamamoto, Satoshi, Ohshima, Shinsuke, Konoshima, Shigeru, Nakamura, Yuji, Ishizawa, Akihiro, Lu, Xiang-xun, Zang, Linge, Marushchenko, Nikolai, Yoshimura, Yasuo, Mizuuchi, Tohru
Format: Article
Language:English
Subjects:
Diagnostic systems
Electron energy
Energetic particles
Frequency filters
Frequency ranges
Intermediate frequencies
Laboratory tests
Radiometers
Variation
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A radial correlation ECE radiometer diagnostic has been developed for electron temperature fluctuation measurements in the helical-axis heliotron device, Heliotron J. The radiometer consists of two heterodyne detection systems. One system scans the frequency of a local oscillator from 52 to 64 GHz with a single intermediate frequency filter, and the second system has a fixed frequency, 56 GHz local oscillator with four intermediate frequency filters. This frequency range covers measurement positions spanning from the plasma core to the half radius. Laboratory tests indicate that each system has narrow intermediate frequency bandwidth and high-sensitivity over a large dynamic range. During plasma experiments with NBI heating, radiation temperature fluctuation measured by the CECE radiometer decrease with increasing ECCD commensurate with previous measurements of energetic particle driven modes on Heliotron J.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201920303013