Overview of ECE diagnostics on LHD

Y. Nagayama, S. Inagaki, H. Sasao, P. De Vries, Y. Ito, K. Kawahata, K. Narihara, I. Yamada

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

An electron cyclotron emission (ECE) diagnostic system has been installed on the large helical device (LHD). In LHD, the magnetic field profile has a peak near the plasma center, so the electron temperature profile of both sides can be continuously measured by the ECE system using two antennas. The ECE spectrometers are as follows, two heterodyne radiometers with the local frequency of 70 and 132 GHz, respectively, a grating polychromator and a Michelson spectrometer. The measurements are processed by the distributed data acquisition system. The angle of the magnetic field from the toroidal direction varies from -30 to +30° in LHD. It is found that the polarization of ECE follows the angle of the magnetic field when the electron density is high enough. The effect of the polarization is considered when the temperature calibration is performed. ECE is useful to distinguish small perturbations in the electron temperature profile, for example, to effects of a local island diverter.

Original languageEnglish
Pages (from-to)201-211
Number of pages11
JournalFusion Engineering and Design
Volume53
Issue number1-4
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

Cyclotrons
Electrons
Electron temperature
Magnetic fields
Spectrometers
Polarization
Diffraction gratings
Radiometers
Carrier concentration
Data acquisition
Calibration
Antennas
Plasmas
Temperature

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Nagayama, Y., Inagaki, S., Sasao, H., De Vries, P., Ito, Y., Kawahata, K., ... Yamada, I. (2001). Overview of ECE diagnostics on LHD. Fusion Engineering and Design, 53(1-4), 201-211. https://doi.org/10.1016/S0920-3796(00)00539-1

Overview of ECE diagnostics on LHD. / Nagayama, Y.; Inagaki, S.; Sasao, H.; De Vries, P.; Ito, Y.; Kawahata, K.; Narihara, K.; Yamada, I.

In: Fusion Engineering and Design, Vol. 53, No. 1-4, 01.01.2001, p. 201-211.

Research output: Contribution to journalArticle

Nagayama, Y, Inagaki, S, Sasao, H, De Vries, P, Ito, Y, Kawahata, K, Narihara, K & Yamada, I 2001, 'Overview of ECE diagnostics on LHD', Fusion Engineering and Design, vol. 53, no. 1-4, pp. 201-211. https://doi.org/10.1016/S0920-3796(00)00539-1
Nagayama Y, Inagaki S, Sasao H, De Vries P, Ito Y, Kawahata K et al. Overview of ECE diagnostics on LHD. Fusion Engineering and Design. 2001 Jan 1;53(1-4):201-211. https://doi.org/10.1016/S0920-3796(00)00539-1
Nagayama, Y. ; Inagaki, S. ; Sasao, H. ; De Vries, P. ; Ito, Y. ; Kawahata, K. ; Narihara, K. ; Yamada, I. / Overview of ECE diagnostics on LHD. In: Fusion Engineering and Design. 2001 ; Vol. 53, No. 1-4. pp. 201-211.
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