Cleaning of inner vacuum surfaces in the Uragan-3M facility by radio-frequency discharges

Two-Strap Rf Antenna in Uragan-2m Stellarator

“…Such a Used wall conditioning method allows one to employ the same antennas and RF generators both for working regime plasma creation and heating without frequency change for the antenna and generator circuits during conditioning regime. The wave propagation and damping in weak magnetic fields are discussed in the paper [9].…”

“…The current scenario with two antennas is similar to the U-3M [9] and U-2M regime. The scenario includesthat the frame antenna produces plasma, and the fast wave antenna (e.g.…”

“…This regime is described in Refs. [6,[9][10][11]. The frame [7] and two-strap unshielded antennas were used for wall conditioning.…”

“…The Uragan-3M (U-3M) and U-2M vacuum chambers are RF conditioned in weak magnetic fields at frequencies up to 10 MHz [6,9,10]. The conditioning method was proposed in Ref.…”

Modelling of Radio-Frequency Wall Conditioning in Short Pulses in a Stellarator

“…The hydrogen wall conditioning aiming for producing hydrogen atoms was practiced at many fusion devices with truly positive results [1]. The mechanism of wall conditioning consists of the interaction of the plasma ions and neutral hydrogen atoms with the wall surfaces in which volatile substances are formed with a certain probability.…”