In the 1 = 3, w = 9 URAGAN-3M torsatron an open helical divertor is realized.Plasmas nre RF produced and heated. The time and space &ancleristics of the plasma in the space between two coils of lhe helical winding and on the outward side of the helical winding are studied by microwave and probe techniques. The experimental measurements are preceded by numerical divertor field line tracing. AS B result of the calculations and measurements, it is shown chat the diverted plasma is formed due to (i) plasma transportation from the confinement volume; and (ii) neutral 93s ionization by the near-antenna field. The Row of diverted plasma transported from the confinemen1 volume increases with RF power. This is wnsidered as direct evidence of an increase in particle loss with an incrwe in heating power, the effect having been deduced recently for a stellarator-type device under NBI and ECR heating conditions. An intense RF discharge along open field lines crossing the operating antenna results in a greatly increased diverted plasma density. in the appeamce of a static positive plasma potential up to 150 V near the antenna. and possibly in significant additional RF power loss outside the confinement region.
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