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The soft X-ray spectral region between 0.1 nm and 10 nm includes the peak of the radiated power and contains a wide range of diagnostic information about the temperature and density of electrons and impurity ions. Spectroscopy of this band will be essential for ITER, and the application are discussed in this paper. Two main applications will be important. Firstly, impurity species monitoring for impurity control, wall protection and the derivation of P(rad) and Z(eff) components. This requires broad-band coverage between 0.1 nm and 10 nm. Secondly, derivation of ion temperature and plasma rotation, which requires high-resolution Doppler broadening and shift measurements of one or more narrow spectral regions. At JET, these two functions are performed by independent instruments which together form the basis of an X-ray spectroscopy installation for ITER. The main requirement is for a vacuum beamline, leading to a shielded bunker outside the cryostat. In such a location the problems of crystal life and detector shielding will be manageable. Spatial resolution will be particularly difficult to achieve on ITER, and a system cannot be specified until port access is more closely defined. Several options will be discussed, with multiple direct lines of sight being preferred.

Additional information

Authors: BARNSLEY R, University of Leicester, Department of Physics and Astronomy (GB);GIANNELLA R M, JET Joint Undertaking, Abingdon, Oxon. (GB);LAWSON K D, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);PEACOCK N J, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(96)01 EN (1996) 14pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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