The 14-channel grating polychromator for ECE measurements in LHD

K. Kawahata, P. C. DeVries, Y. Nagayama, Inagaki Shigeru, T. Tokuzawa, K. Tanaka, H. Sasao

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A 14-channel grating polychromator for the purpose of measuring the electron cyclotron emission (ECE) spectrum has been developed and installed on the large helical device (LHD). The grating polychromator has a Czerny-Turner setup. The main advantage of the grating polychromator is that it has a broad spectral range. Hence, it can be utilized at different magnetic field strengths. Changing the angle or replacing the grating can do this. Gratings with a grid constant of d = 2.3, 3, and 5 mm and a blaze angle of 20° can be applied and the scattered spectrum is directed to 14-liquid He cooled InSb detectors. Standard operation is performed with d = 3 mm, frange= 148-105GHz. This is second harmonic ECE for B = 2.75 T. Each channel has a spectral resolution of Δf (full width at half maximum) = 2.6 GHz or f/Δf=60 at f = 150GHz. The properties of the instrument and first experimental results of LHD ECE will be described in this article.

Original languageEnglish
Pages (from-to)387-390
Number of pages4
JournalReview of Scientific Instruments
Volume72
Issue number1 II
DOIs
Publication statusPublished - Jan 1 2001

Fingerprint

Cyclotrons
cyclotrons
gratings
Electrons
Electron devices
electrons
Spectral resolution
Full width at half maximum
Magnetic fields
Detectors
spectral resolution
Liquids
field strength
emission spectra
grids
harmonics
detectors
liquids
magnetic fields

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Kawahata, K., DeVries, P. C., Nagayama, Y., Shigeru, I., Tokuzawa, T., Tanaka, K., & Sasao, H. (2001). The 14-channel grating polychromator for ECE measurements in LHD. Review of Scientific Instruments, 72(1 II), 387-390. https://doi.org/10.1063/1.1309006

The 14-channel grating polychromator for ECE measurements in LHD. / Kawahata, K.; DeVries, P. C.; Nagayama, Y.; Shigeru, Inagaki; Tokuzawa, T.; Tanaka, K.; Sasao, H.

In: Review of Scientific Instruments, Vol. 72, No. 1 II, 01.01.2001, p. 387-390.

Research output: Contribution to journalArticle

Kawahata, K, DeVries, PC, Nagayama, Y, Shigeru, I, Tokuzawa, T, Tanaka, K & Sasao, H 2001, 'The 14-channel grating polychromator for ECE measurements in LHD', Review of Scientific Instruments, vol. 72, no. 1 II, pp. 387-390. https://doi.org/10.1063/1.1309006
Kawahata K, DeVries PC, Nagayama Y, Shigeru I, Tokuzawa T, Tanaka K et al. The 14-channel grating polychromator for ECE measurements in LHD. Review of Scientific Instruments. 2001 Jan 1;72(1 II):387-390. https://doi.org/10.1063/1.1309006
Kawahata, K. ; DeVries, P. C. ; Nagayama, Y. ; Shigeru, Inagaki ; Tokuzawa, T. ; Tanaka, K. ; Sasao, H. / The 14-channel grating polychromator for ECE measurements in LHD. In: Review of Scientific Instruments. 2001 ; Vol. 72, No. 1 II. pp. 387-390.
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