Large changes in visible light and X-ray emission are observed when an injected pellet of solid D 2 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.
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Gill et al. (1989) studied this question.
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