Determination of the shear on the q = 1 surface of the JET tokamak
- 1 May 1989
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 29 (5) , 821-825
- https://doi.org/10.1088/0029-5515/29/5/011
Abstract
Large changes in visible light and X-ray emission are observed when an injected pellet of solid D2 crosses the q = 1 surface of the JET tokamak. An explanation of this observation is offered and it is shown that this resonance effect can be used to follow the position of the q = 1 surface during a sawtooth cycle. A new method of determining the magnetic shear on the q = 1 surface is presented. Very low values of shear are found and the implications for theories of the sawtooth instability are discussed.Keywords
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