Abstract
Measurements using a toroidal and poloidal array of 20 Langmuir probes in the JET belt limiter show a toroidal symmetry in edge flux within typically ± 15%. A reciprocating probe array has been used to record radial profiles of edge temperature T e (r) , density n e (r) and floating potential V f (r) up to 30 mm inside the last closed flux surface (LCFS). A change in sign of dV f (r)/ dr is recorded at the LCFS, together with a clear break in profiles which can be fitted by a single exponential in the limiter shadow. A comparison has been made of the edge data with the belt limiter configuration to that with the discrete limiters. Absolute values of edge parameters are found to be lower, and e-folding lengths steeper, for the belt limiter case. However, the general trends in scaling are very similar to those reported previously.
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