In relating the density scrape-off layer thickness lambda n to D perpendicular to , account is taken of two aspects of the JET configuration: (a) the poloidally-varying cross-section of plasma flux tubes in the scrape-off layer, and (b) the different limiter configurations-discrete/continuous. Edge measurements of lambda n (0) in JET made by Langmuir probes and limiter-viewing cameras are used to deduce edge values of D perpendicular to for ohmic discharges, over a range of conditions, I p =1-5 MA, n e =0.7-6*10 19 m -3 . Generally the values are found to be close to D perpendicular to =10 19 /n e m 2 s -1 , that is, Intor-Alcator scaling.
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Stangeby et al. (1988) studied this question.
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