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The use of a CO(2) laser as the source for collective Thomson scattering measurements of alpha particles and fast ions requires that the detection system provides spectral resolution of about 1 GHz over a bandwidth of about +/- 15 GHz. It is suggested that this requirement may be met by efficient optical parametric upconversion of the scattered pulsed CO(2) laser radiation to visible wavelengths followed by spectral dispersion and detection (with high efficiency) of the visible light. A new method of determining scattering spectra is also proposed, based on the imaging capabilities of the parametric upconverter.

Additional information

Authors: HUGHES T P, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(95)73 EN (1995) 13pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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