Field-reversed configuration maintained by rotating magnetic field with high spatial harmonics.

Area of Science:

• Plasma Physics
• Fusion Energy Research

Background:

• Field-reversed configurations (FRCs) are a promising approach for magnetic confinement fusion.
• Understanding the dynamics of rotating magnetic fields (RMFs) is crucial for FRC stability and sustainment.

Purpose of the Study:

• To investigate the penetration and effects of RMFs with spatial high harmonics in an FRC.
• To analyze the impact of RMF harmonic components on plasma force balance and stability.

Main Methods:

• Experiments were conducted using FRCs within a metal flux conserver.
• The study focused on RMFs with spatial high harmonics, analyzing their interaction with the plasma column.

Main Results:

• The fundamental RMF component successfully penetrated the plasma column.
• High-harmonic RMF components were screened at the plasma edge due to differential rotation.
• Selective RMF penetration allowed for radial inward force generation () and azimuthal torque provision.

Conclusions:

• The selective penetration of RMF components is key to achieving compatible radial and azimuthal force balances in FRCs.
• High-harmonic screening and fundamental component penetration contribute to plasma stability and sustainment in FRC devices.