The JET reciprocating probe systems are described. This paper will also cover determination of separatrix position using the pressure balance method. Use of floating potential to indicate separatrix location is shown to be incorrect. Other topics covered are comparison of upstream profiles with both lithium beam and ‘onion-skin’ modelling, experience with triple-probe operation for ELM studies and the development of a boron-nitride probe head.
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Davies et al. (1996) studied this question.
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