Effect of quadrupole fields on local three-dimensional (3-D) ideal magnetohydrodynamic (MHD) stability in torsatrons
The local three-dimensional (3-D) ideal magnetohydrodynamic (MHD) stability properties of a 12-field period torsatron device of moderate aspect ratio are investigated as a function of an externally applied quadrupole magnetic field. It is demonstrated that with a parabolic pressure profile the volume-averaged beta limit due to the ballooning instabilities decreased from approximately 2 % to approximately 1.5 % as the current I(mid) in the quadrupole field coils, normalised to that in the main helical coils, increases from 0 to 0.19.
Bibliographic Reference: Article: Phys. Plasmas, Vol. 1 (1994) No. 3, pp. 793-795
Record Number: 199410518 / Last updated on: 1994-11-28
Original language: en
Available languages: en