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Abstract

During the D-T phase in JET, fusion reactions are expected to produce many 3.5MeV alpha particles. Some will escape immediately from the plasma, but most will be contained and will slow down from their initial velocity v-alpha-o approximately equal 1.3 x 10**7m.s.**-1 to thermal velocities, transferring their energy to plasma particles. With anticipated alpha densities of order 10**17m**- 3-, substantial free energy will be present which may also cause strong non-thermal effects, depending on the form of the velocity distribution function f-alpha ($8Zv,t). It is desirable, therefore, to determine the time dependent alpha particle distribution function in the plasma. The report begins with a brief survey of published work on the behaviour of alpha particles in plasmas, leading to some predictions of the expected form of f-alpha ($8Zv,t). Several proposed methods for the experimental determination of f-alpha are then discussed, some of which are sufficiently promising to merit more detailed consideration. A new technique is proposed for determining the spectrum of small-angle, Thomson-scattered 10.6mum radiation. Finally, Thomson scattering of gyrotron radiation is considered.

Additional information

Authors: HUGHES T P UNIVERSITY OF ESSEX, COLCHESTER (UK), UNIVERSITY OF ESSEX, COLCHESTER (UK)
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-R(86)10, 1986
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