Plasma biasing by non-resonant ponderomotive forces of radio-frequency waves

A numerical code that computes stationary radial electric fields E_0r induced by ponderomotive forces of radio-frequency waves is developed. The computed value of E_0r is typically several hundred volts per centimetre when the wave frequency is 1 % lower or higher than the ion-cyclotron frequency. This value of E_0r suggests that the ponderomotively induced electric field would be an effective bias in tokamaks. Numerical data are presented to illustrate the properties of this bias field.