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The Joint European Torus (JET) divertor light detection and ranging (LIDAR) system, KE9D, is being modified to perform measurements of plasma edge electron temperature and density in the new gas-box divertor configuration. The change involves raising the line of sight from the divertor region so that the laser beam passes through the plasma edge reaching a depth of approximately 5 cm inside the boundary. Changes are also being made to the detection system. This currently employs a grating spectrometer and a streak camera. The new system will contain a 4-channel filter spectrometer with microchannel plate (MCP) photomultipliers. An important parameter determining the quality of the signal from a photomultiplier is its effective quantum efficiency, calculated from the observed signal and noise characteristics. This parameter has been measured at JET for three commercial photomultipliers with a view to selecting a detector for the new KE9D system. The measurement is described in this paper and results for the three detectors are given.

Additional information

Authors: ARSHAD S A, JET Joint Undertaking, Abingdon Oxon (GB);GOWERS C W, JET Joint Undertaking, Abingdon Oxon (GB);NIELSEN P, JET Joint Undertaking, Abingdon Oxon (GB)
Bibliographic Reference: Report: JET-R(98)06 EN (1998) 5pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199811100 / Last updated on: 1998-09-28
Original language: en
Available languages: en
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