Implementation of an in-vessel calibration light source for JET

An in-vessel calibration light source (ICLS) has been implemented for remote use during extended shutdown periods of the Joint European Torus (JET). The ICLS facilitated the in situ calibration of optical diagnostics, which previously were performed when the diagnostics were removed from JET. Since...

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Bibliographic Details
Published in:Review of scientific instruments 2012-10, Vol.83 (10), p.10D505-10D505
Main Authors: Biewer, T M, Belcher, C, Hassall, I, Hillis, D L, Kaveney, G, Scharpf, D, Stamp, M F, Stunell, C, Zastrow, K-D
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CALIBRATION
diagnostic calibration JET plasma
Diagnostic systems
Discharge
IMPLEMENTATION
Joint European Torus
Light
LIGHT SOURCES
Magnetic Phenomena
Optical paths
Physics - instrumentation
PLASMA
Plasma Gases - chemistry
SHUTDOWN
Shutdowns
Walls
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Summary:An in-vessel calibration light source (ICLS) has been implemented for remote use during extended shutdown periods of the Joint European Torus (JET). The ICLS facilitated the in situ calibration of optical diagnostics, which previously were performed when the diagnostics were removed from JET. Since the ICLS is used to calibrate diagnostics over the entire, exact optical path as used when plasma discharge data are measured, the ICLS calibration implicitly accounts for any vignetting losses in the JET vessel viewports in addition to the vacuum window transmission. At least ten diagnostic systems have benefited from the ICLS during the extended ITER-like wall shutdown of 2009-2011. Examples of the use of the ICLS in JET are given.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4729502