Prospects for ion temperature measurements in JET by Thomson scattering of submillimetre waves

Technical Report · Sat Mar 01 04:00:00 EDT 1975

OSTI ID:4139308

Whitbourn, L B

The Thomson scattering of submillimeter waves is envisaged as a possible means for measuring the ion temperature of the JET plasma. The present discussion is principally concerned with the practical limitations imposed to the method by the availability of high power pulsed sources and sensitive detectors and noise due to plasma emission at submillimeter wavelengths (bremsstrahlung and electron cyclotron emission). Coherent scattering from plasma wave (e.g. ion acoustic waves and electron drift waves) with millimeter and submillimeter waves are considered briefly. Further suitable development of lasers and heterodyne detectors would make such measurements possible. A pulsed HCN laser associated with a detectors with a lower heterodyne noise equivalent power could then be used to advantage. For scattering with CH$sub 3$F laser the NEP of a Josephson junction would be adequate because a relatively high level of plasma emission is expected at 496 $mu$m.

• Research Organization: Association Euratom-CEA, Centre d'Etudes Nucleaires de Fontenay- aux-Roses, 92 (France). Groupe de Recherches sur la Fusion Controlee; CEA Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Dept. de Physique du Plasma et de la Fusion Controlee
• NSA Number: NSA-33-009022
• OSTI ID: 4139308
• Report Number(s): EUR-CEA-FC--766
• Country of Publication: France
• Language: English

Related Subjects

*TOKAMAK DEVICES-- PLASMA DIAGNOSTICS
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EUROPE
ION TEMPERATURE
LASER RADIATION
MICROWAVE RADIATION
N70200* --Physics--Controlled Thermonuclear Research-- Diagnostics