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    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.

    Citation

    T M Biewer, C Belcher, I Hassall, D L Hillis, G Kaveney, D Scharpf, M F Stamp, C Stunell, K-D Zastrow, JET-EFDA Contributors. Implementation of an in-vessel calibration light source for JET. The Review of scientific instruments. 2012 Oct;83(10):10D505

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    PMID: 23130789

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