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A high resolution LIDAR Thomson scattering system for JET has been designed, using a streak camera detection system. The best achievable spatial resolution of the existing LIDAR system is 9-10 cm. There is a need for higher resolution in order to resolve the density and pressure gradients at the plasma edge during H-mode operation of JET. It has been reported that by using a streak camera system, resolution of better than 4 cm is in principle possible, over a limited part of the plasma radius. Some feasibility experiments were carried out during part of the last JET period of operations in 1990. A Hadland 675 Imacon streak camera and 50/40 intensifier formed the detection system, and a Tektronix DCS digitising CCD camera system recorded the data and transferred them to a PC for analysis. Results obtained on the stray light signature, plasma light levels and the initial attempts to record scattering results are reported. Some general problems encountered in the operation of the detection system and the interpretation of data are discussed. Using a Thomson CSF streak camera, intensifier and digitising CCD camera system, and a set of optimised high filters, a system to take high resolution electron temperature and density measurements has been constructed and calibrated.

Additional information

Authors: FAJEMIROKUN H, Imperial College of Science, Technology and Medicine, London (GB);GOWERS C, JET Joint Undertaking, Abingdon, Oxon. (GB);NIELSEN P, JET Joint Undertaking, Abingdon, Oxon. (GB);HIRSCH K, Universität Stuttgart, Institut für Plasmaforschung (DE);KAJIWARA T, Kyushu University, Interdisciplinary Graduate School of Engineering Sciences (JP);SALZMANN H, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: JET-P(91)52 EN (1991) 20 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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