Helical core tokamak MHD equilibrium states

W A Cooper, J P Graves, O Sauter, J Rossel, M Albergante, S Coda, B P Duval, B Labit, A Pochelon, H Reimerdes
<span title="2011-11-14">2011</span> <i title="IOP Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/ynj4gobbebc4hgaszc5dq6bpce" style="color: black;">Plasma Physics and Controlled Fusion</a> </i> &nbsp;
Bifurcated magnetohydrodynamic (MHD) tokamak equilibrium states with axisymmetric or helical core structure are computed. When a peaked pressure profile is chosen, the helical core structures appear like the snakes that are observed in the JET tokamak. They also have the allure of saturated ideal internal kinks. The existence of a magnetic island is not a requisite condition. Novel equilibrium states that can model the snake are obtained for a JET configuration when the q-profile has weak
more &raquo; ... ed magnetic shear with minimum q values in the range 0.94 to 1.03. At the lower end of this q min range, the equilibrium snake structure lies radially well inside the domain for which q min 1. Free boundary equilibria computed for the TCV tokamak develop helical cores when β N exceeds 0.3 and have a significant axis excursion for β N 0.4. At fixed β = 1.6%, the distortion of the magnetic axis is large in the range 0.95 q min 1.01. The plasma-vacuum interface is not significantly altered by the internal helical deformations.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1088/0741-3335/53/12/124005">doi:10.1088/0741-3335/53/12/124005</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/bfj47ndokzd7dnu4reqc2caari">fatcat:bfj47ndokzd7dnu4reqc2caari</a> </span>
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