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The broadband VUV impurity survey spectrometer - KT2 - has been operational on JET since 1984. This report summarises the various calibrations of the spectrometer carried out at Culham up to the end of 1990, and provides reference sensitivity curves from May 1989 onwards. The spectrometer has been calibrated at wavelengths below 584 Angstroms using a high current hollow cathode lamp, of a type which has been calibrated with reference to a synchrotron. The resulting calibration curve has a similar shape to that obtained on other instruments of this type produced by the same manufacturer. The absolute sensitivity has also been derived from a BeIII branching ratio from the quartz UV region. The absolute measurements from the lamp source are considerably different (by a factor of about 10) from those obtained by branching ratios on JET. The latter measurements are considered to be more reliable, since they involve the same plasma viewing geometry in the calibration as was used in the measurements.

Additional information

Authors: HAWKES N, JET Joint Undertaking, Abingdon, Oxon. (GB);PEACOCK N, JET Joint Undertaking, Abingdon, Oxon. (GB);LAWSON K, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(91)07 EN (1991) 24 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199111514 / Last updated on: 1994-12-02
Original language: en
Available languages: en