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A high resolution X-ray crystal spectrometer built by JET and ENEA Frascati Laboratory allows the observation in high resolution and identification of lines from the highest ionization stages (B-like and H-like) of nickel in JET plasmas. These are in the vicinity of the resonance transitions of the one- and two-electron systems of this element. These spectra and their relevance to the study of JET physics are briefly presented. The comparison with atomic physics theoretical computations of He-like and H-like ions spectra observed at JET is also presented. The most intense of these lines could regularly be monitored with adequate time resolution so as to allow the production of an extensive data base. The experimental spectra are simulated by integrating the theoretical ones along the spectrograph line of sight across the plasma. Ion temperature and rotation velocity measurements in ohmic and additionally heated plasmas are discussed and their relationship with other physical quantities and operational parameters reviewed. Details of the spectrometer design, its layout at the JET site and its operational capabilities are given.

Additional information

Authors: GIANNELLA R, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: RT/FUS/87/20 EN (1987)
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
Record Number: 198910107 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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