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A field-reversed configuration FRC is formed by applying a rotating magnetic field RMF much\udlarger than the axial magnetic field to a cylindrical glass vacuum chamber filled with 10 Pa argon\udgas without a preionization. The FRC with the plasma density 2.21019 m−3, the temperature\ud8.0 eV, the separatrix length 0.45 m, and the separatrix radius 0.035 m is sustained for the notably\udlong period of 40 ms. It is observed that the antenna current which produces the RMF is reduced by\udabout half after the FRC is formed. The interaction between the plasma and the antenna circuit\udincreases the antenna resistance and changes the inductance of the antenna so that the circuit\udbecomes nonresonant. The RMF is sufficiently large to fully penetrate to the center during the period\udand drive the current with a rigid rotor profile. The RMF is shown to play a major role in sustaining\udthe plasma pressure. © 2008 American Institute of Physics

Penetration and radial force balance in field-reversed configuration with large rotating magnetic field