Construction of a 100-Hz-repetition-rate 28-channel Thomson scattering system for the JIPPT-IIU Tokamak

An ASDEX-type Thomson scattering system (YAG Thomson) with an improved performance (100 Hz repetition rate and 1.5 cm spatial resolution) was designed and constructed for the JIPPT-IIU tokamak. Efforts were concentrated on realizing a large solid angle of collection optics (0.08 sr), high throughput...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 35; no. 1A; pp. 266 - 273
Main Authors NARIHARA, K, YAMAUCHI, K, MINAMI, T, YAMADA, I, SATO, K, KAWAHATA, K, HAMADA, Y, KOJIMA, M, HIROKURA, S
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 1996
Subjects
Exact sciences and technology
Magnetic confinement and equilibrium
Optical (ultraviolet, visible, infrared) measurements
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma diagnostic techniques and instrumentation
Tokamaks
Design
Plasma diagnostics
Instrumentation
Calibration
Performance
JIPPT-IIU tokamak
Thomson scattering
YAG
Neodymium lasers
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Summary:An ASDEX-type Thomson scattering system (YAG Thomson) with an improved performance (100 Hz repetition rate and 1.5 cm spatial resolution) was designed and constructed for the JIPPT-IIU tokamak. Efforts were concentrated on realizing a large solid angle of collection optics (0.08 sr), high throughput of polychromators ( >64%) and high quantum efficiency of detectors (80% at 900 nm), which, together, yield high-quality data even with a small laser energy (0.4 J) delivered by a 100-Hz-repetition-rate Nd:YAG laser and with a short scattering length (1.0 cm). The compactness of the polychromators also contributes to achieving a high spatial resolution.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.35.266