Poloidal magnetic field measurement system in JT‐60

A diagnostic system using a helium beam for local poloidal magnetic field measurements (Zeeman polarimeter system) has been constructed. The Zeeman spectrum of the helium 31 P‐21 S line was observed in JT‐60. The intensity and energy of the neutral helium beam were up to 0.6 A and 200 keV, respectiv...

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Bibliographic Details
Published in:Review of scientific instruments 1991-11, Vol.62 (11), p.2695-2699
Main Authors: Nishino, Nobuhiro, Kubo, Hirotaka, Sakasai, Akira, Koide, Yoshihiko, Akaoka, Nobuo, Sugie, Tatsuo, Tsukahara, Yoshimitu, Ito, Takao, Takeuchi, Hiroshi
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102 - Fusion Energy- Plasma Research- Diagnostics
CALIBRATION
CLOSED PLASMA DEVICES
CURRENT DENSITY
ELEMENTS
Exact sciences and technology
FLUIDS
GASES
HELIUM
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
JT-60 TOKAMAK
MAGNETIC FIELDS
NONMETALS
Other topics in instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
PLASMA DIAGNOSTICS
POLARIMETERS
RARE GASES
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VISIBLE SPECTRA
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Summary:A diagnostic system using a helium beam for local poloidal magnetic field measurements (Zeeman polarimeter system) has been constructed. The Zeeman spectrum of the helium 31 P‐21 S line was observed in JT‐60. The intensity and energy of the neutral helium beam were up to 0.6 A and 200 keV, respectively. Resolution of the Zeeman polarimeter was 0.01 nm which was realized by using a Littrow‐type spectrometer. Photon counting efficiency was 0.065. Moreover, an in situ wavelength calibration could be done, using an Ar laser, within an error of 0.001 nm.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1142202