In the l = 3/m = 9 Uragan-3M (U-3M) torsatron with an open helical divertor and RF produced and heated plasmas, effects of H-mode transition on (i) diverted plasma flow (DPF) magnitude in the spacings between the helical coils and (ii) fast ion escape into DPF are studied by using arrays of plane Langmuir probes and electrostatic ion energy analyzers. Data have been obtained on how the amount and energy of lost ions change with transition in several field periods. A strong toroidal nonuniformity in ion loss has been observed. The island structure of the real U-3M magnetic configuration and the locality of RF power injection into the plasma are considered as possible reasons for such nonuniformity.

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