000120142 001__ 120142
000120142 005__ 20180913054315.0
000120142 020__ $$a1536-1055
000120142 022__ $$a1536-1055
000120142 02470 $$2ISI$$a000224256300020
000120142 037__ $$aARTICLE
000120142 245__ $$aMagnetohydrodynamic stability of free-boundary quasi-axisymmetric stellarator equilibria with finite bootstrap current
000120142 260__ $$c2004
000120142 269__ $$a2004
000120142 336__ $$aJournal Articles
000120142 520__ $$aThe impact of the bootstrap current is investigated on the equilibrium properties of a two-period quasi-axisymmetric stellarator reactor with free boundary and on the corresponding ideal magnetohydrodynamic stability properties. Although the magnetic field strength B spectrum is dominated by a m/n = 1/0 component, the discrete filamentary coils trigger some small-amplitude symmetry-breaking components that can disturb,the quasi-symmetry of B. Finite beta causes the plasma column to shift outward in the absence of bootstrap current. With a self-consistent bootstrap current in the 1/v regime, the plasma becomes more elongated and more distorted in the horizontally elongated up-down symmetric cross section. At beta similar or equal to 3.25%, the plasma can be restored to its near-vacuum shape with the application of a vertical field with coil currents 20% of those of the modular coils, but at the expense of a significant mirror component in the B-field spectrum. The bootstrap current causes the rotational transform iota profile to increase above the critical resonant value (iota(c) = 1/2 for beta greater than or equal to 1.1%) and combines with the Pfirsch-Schluter current to destabilize a m/n = 2/1 external kink mode for beta greater than or equal to 1.8%.
000120142 700__ $$0240516$$aCooper, W. A.$$g104815
000120142 700__ $$aMargalet, S. F. I.
000120142 700__ $$0241653$$aAllfrey, S. J.$$g135299
000120142 700__ $$aKisslinger, J.
000120142 700__ $$aWobig, H. F. G.
000120142 700__ $$aNarushima, Y.
000120142 700__ $$aOkamura, S.
000120142 700__ $$aSuzuki, C.
000120142 700__ $$aWatanabe, K. Y.
000120142 700__ $$aYamazaki, K.
000120142 700__ $$aIsaev, M. Y.
000120142 773__ $$j46$$k2$$q365-377$$tFusion Science and Technology
000120142 909C0 $$pCRPP
000120142 909C0 $$0252028$$pSPC
000120142 909CO $$ooai:infoscience.tind.io:120142$$pSB$$particle
000120142 937__ $$aCRPP-ARTICLE-2004-087
000120142 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000120142 980__ $$aARTICLE