Suppression of n=1 Tilt Instability by Magnetic Shaping Coils in Rotamak Plasmas
Abstract
Measurements from the array of Mirnov magnetic coils provide the first evidence for n=1 tilt and radial shift instabilities in a 40 ms field-reversed configuration (FRC) driven by rotating magnetic field. External plasma-shaping magnetic coils are utilized to suppress the n=1 instability modes. It is demonstrated that by energizing the middle shaping coil with 250-500 A current, the tilt mode is completely suppressed when a doublet FRC with an internal figure-of-eight separatrix is formed.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2009
- DOI:
- Bibcode:
- 2009PhRvL.102y5004Y
- Keywords:
-
- 52.55.Lf;
- 52.35.Py;
- Field-reversed configurations rotamaks astrons ion rings magnetized target fusion and cusps;
- Macroinstabilities