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

doi:10.1063/1.1309006

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 journal › Article › peer-review

5 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, f^range= 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 language	English
Pages (from-to)	387-390
Number of pages	4
Journal	Review of Scientific Instruments
Volume	72
Issue number	1 II
DOIs	https://doi.org/10.1063/1.1309006
Publication status	Published - Jan 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1309006

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title = "The 14-channel grating polychromator for ECE measurements in LHD",

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.",

author = "K. Kawahata and DeVries, {P. C.} and Y. Nagayama and Inagaki Shigeru and T. Tokuzawa and K. Tanaka and H. Sasao",

year = "2001",

month = jan,

doi = "10.1063/1.1309006",

language = "English",

volume = "72",

pages = "387--390",

journal = "Review of Scientific Instruments",

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T1 - The 14-channel grating polychromator for ECE measurements in LHD

AU - Kawahata, K.

AU - DeVries, P. C.

AU - Nagayama, Y.

AU - Shigeru, Inagaki

AU - Tokuzawa, T.

AU - Tanaka, K.

AU - Sasao, H.

PY - 2001/1

Y1 - 2001/1

N2 - 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.

AB - 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.

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 1 II

ER -

The 14-channel grating polychromator for ECE measurements in LHD

Abstract

All Science Journal Classification (ASJC) codes

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