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Abstract

Recent developments and results of the JET Charge Exchange Recombination Spectroscopy (CXRS) diagnostic are reported. The measurement of radial profiles of ion temperatures and densities was based on CXR spectra of fully-stripped ions of either carbon or beryllium. Considerable effort was expended to ensure consistency between radial profiles of low-Z impurity densities and those from other diagnostics. The contributions of the main light impurities were used to reconstruct radial profiles of Z(eff) which can be compared with Abel-inverted signals from visible bremsstrahlung or soft X-ray emission. Active Balmer-Alpha Spectroscopy (ABAS) is being introduced as a diagnostic tool, providing data on local magnetic fields, neutral beam densities and dilution factors. The effects of collision-energy-dependent CXR cross-sections on observed CXR spectra are calculated. Corrections for the values of deduced ion temperatures, toroidal velocities and impurity densities are discussed for the case of plasmas with high ion temperatures and high toroidal rotation velocities. Some recent results of the JET 1989 operation illustrating the CXRS diagnostic potential are given.

Additional information

Authors: VON HELLERMANN M G, JET Joint Undertaking, Abingdon, Oxon. (GB);MANDL W, JET Joint Undertaking, Abingdon, Oxon. (GB);SUMMERS H P ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(90)31 EN (1990) 30 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199110101 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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