A Vacuum Ultra-violet Spectrometer (Double SPRED) for the Observation of the JET Divertor Plasma
The SPRED spectrometer is a vacuum ultraviolet (VUV) survey instrument and its use of a holographic grating results in a flat focal field, enabling the best spectral resolution to be achieved over the whole extent of the detector. A double SPRED spectrometer having 2 fixed gratings and 2 independently controlled detectors has been installed on the JET machine for the observation of the divertor plasma. Comparison with the spectral emission from the bulk plasma, observed with a single SPRED instrument, emphasizes that the dominant emission from the divertor originates from low ionization stages of low Z-impurities such as carbon. Evidence has been found for the localization of the line emission from within the divertor chamber and some features of the divertor VUV radiation during high performance plasmas are described.
Bibliographic Reference: Report: JET-P(95)34 (1995) 33pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199610344 / Last updated on: 1996-03-29
Original language: en
Available languages: en