Effect of L-H and H-L Transitions on Tokamak-reactor Operation
American Journal of Modern Physics
Volume 9, Issue 1, January 2020, Pages: 1-6
Received: Dec. 17, 2019; Accepted: Dec. 31, 2019; Published: Jan. 17, 2020
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Yury Gott, National Research Center Kurchatov Institute, Moscow, Russia
Eduard Yurchenko, National Research Center Kurchatov Institute, Moscow, Russia
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The effect of L-H and H-L transitions on the tokamak-reactor operation is considered. Both initial modes are considered as quasi-equilibrium states with the same thermal energy for constant total toroidal currents. A method has been developed for quantification the change in neutron yield in a tokamak- reactor during these transitions occurring over times much shorter than the plasma energy confinement time. The method is based on the use of duality of solutions of the Grad-Shafranov equation. The arbitrary functions included in this equation were found as a result of approximation of the normalized plasma pressure profiles, presented versus on the radial flow coordinate obtained at the DIII-D facility. To calculate changes in neutron fluxes during L-H and back H-L transitions, we used these plasma pressure distributions for the ITER device parameters presented in Cartesian coordinates. A numerical calculation showed that in the back H-L transition, a large spike on the global neutron production is possible, which was previously discovered experimentally (ALCATOR-C-Mode, 2001). Since such an increase in neutron fluxes during tokamak-reactor ITER operation poses a serious threat to both the personnel and the facility itself, it is necessary to exclude the possibility of such transitions. Thus, it is necessary to develop such a reactor design that would make it possible to obtain a self-sustaining thermonuclear reaction in the L-mode operation.
LH and HL Transitions, ITER, Thermonuclear Neutrons
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Yury Gott, Eduard Yurchenko, Effect of L-H and H-L Transitions on Tokamak-reactor Operation, American Journal of Modern Physics. Vol. 9, No. 1, 2020, pp. 1-6. doi: 10.11648/j.ajmp.20200901.11
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