Plasma potential formation under the influence of an external RF field and the effect of this potential on particle transport

Plasma boundary phenomena in tokamaks

“…(b) How can the impurity generation at the Faraday screen [128,382,[698][699][700] be explained? This influx does not appear to be simply the result of increasing scrape-off length since it occurs only for the antenna actually being activated [687], It has been suggested [701] that this influx is the result of sheath effects at the antenna or of reactive ERP fields near the antenna [688,700,[702][703][704].…”

Behavior Features of the Ungrounded Antenna Potential Shift in Uragan-2m Torsatron

“…The paper [7] states that plasma potential is maximal in the antenna proximity at the distance less than 1 cm. The papers [9,10] are devoted to the study of electrostatic antenna field influence on periphery plasma behavior. They mention edge layer in the antenna proximity and electrons movement from that layer to the excitation electrode or antenna in this case.…”

Low frequency fluctuations of density and potential in the peripheral plasma during ion cyclotron heating in the URAGAN-3 torsatron

“…[5] and the literature cited therein). The antennas used excited both electromagnetic (Alfve'n) and electrostatic oscillations within the plasma at a frequency of w 0 ~ '•'ci-Also observed were electrostatic oscillations at harmonics of o> 0 , which were apparently excited as a result of the non-linear rectification effect of the RF fields in the sheaths near the antenna and the surfaces intersected by the divertor magnetic field lines [23,24]. The electrostatic oscillations were recorded by both the capacitive probes [25] and the Langmuir probes during the entire RF pulse, including the initial discharge stage when the plasma density was still not sufficient to excite the electromagnetic wave.…”