Study of improved confinement by a stepwise increase of the input heating power for tokamak plasmas

Muhammad Asif, Mabruka Mohamed, Eun-jin Kim

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This paper is an extension of the brief study by Sarah Douglas et al. [Phys. Plasmas20 (2013) 114504] where in the study a sinusoidal perturbation of the heating power has been studied. In this paper a stepwise increase of the heating power and its influence on the L–H transition are studied. Using a function, Atanh(t/T) for the transition of input heating power for tokamak plasmas, i.e. the addition of the perturbation, Atanh(t/T), to constant power q0 is shown to promote the confinement, leading to the L–H transition at a lower value of q0, as compared to the case of constant q0 without the Atanh(t/T) perturbation. It is seen that the input heating power Q that consists of constant part q0 in addition to a function Atanh(t/T) provides the L–H transition for relatively small A and much wider range values of 1/T as compared to Sarah Douglas et al. [Phys. Plasmas20 (2013) 114504].
Original languageEnglish
Article number1650316
JournalModern Physics Letters B
Issue number24
Early online date6 Sep 2016
Publication statusPublished - 10 Sep 2016
Externally publishedYes


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