Decreasing water concentration in the Uragan-3m device with uhf discharge

Uragan-3M device vacuum chamber is a cylinder with volume of 70 m3. Between the operation series, it is opened to the atmosphere for scientific and technical works. The problem of high water vapour concentration in the residual gas appears each time the chamber is closed and pumped. Effective water vapour removal can be achieved by baking the vacuum chamber walls at high temperatures (200...400 C) or increasing atomic hydrogen flow produced by the wall conditioning discharge in the plasma confining volume, as far as H₂O detachment speed should be higher than adhesion. It's not technically possible to heat Uragan-3M device vacuum chamber. Room temperature of the vacuum chamber walls is not an obstacle for an UHF discharge with high enough plasma density (8x10¹⁰ cm^-3).