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Abstract

A beam of injected fast atomic hydrogen is a useful probe for hot fusion plasmas. The neutral particles experience excitation and ionisation by collisions with electrons and ions as they penetrate into a plasma. The emitted characteristic line radiation is Doppler shifted and the spectral lines are split due to motional Stark fields. Measurements of wavelength, intensity and polarisation of the Balmer-alpha emission reveal information on the neutral beam, such as beam attenuation, beam geometry, beam divergence and species mix. Local pitch angles and toroidal fields can be derived from the simultaneous measurement of the polarisation pattern and the wavelength separation of the Stark multiplet. The implementation and application of beam emission spectroscopy as a quantitative diagnostic tool on the JET tokamak experiment is reviewed.

Additional information

Authors: MANDL W, JET Joint Undertaking, Abingdon, Oxon. (GB);WOLF R C, JET Joint Undertaking, Abingdon, Oxon. (GB);VON HELLERMANN M G, JET Joint Undertaking, Abingdon, Oxon. (GB);SUMMERS H P, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)93 EN (1992) 36 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199310282 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en
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