Phys. Rev. Lett. 102, 255004 (2009) [4 pages]Suppression of n=1 Tilt Instability by Magnetic Shaping Coils in Rotamak PlasmasReceived 16 February 2009; published 25 June 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.255004
DOI:
10.1103/PhysRevLett.102.255004
PACS:
52.55.Lf, 52.35.Py
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