Dynamics of the LH-transition in TUMAN-3M tokamak in the scenarios with cryogenic pellet injection

A. A. Belokurov*, L. G. Askinazi, L. Chone, E. Z. Gusakov, T. P. Kiviniemi, V. A. Kornev, T. Korpilo, S. V. Krikunov, S. V. Lebedev, S. Leerink, P. Niskala, R. Rochford, A. I. Smirnov, A. S. Tukachinsky, N. A. Zhubr

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

In the experiments on tangential fuel pellet injection in the TUMAN-3M tokamak an initiation of LH-transition or, in several scenarios-temporal (1-2 ms) confinement improvement with the following backwards transition was observed. To understand the possibility of the transitions, a model calculating the evolution of density and ion temperature profiles under the effect of source profile perturbation and plasma cooling created by pellet evaporation was developed. In the model, a diffusion coefficient depending on radial electric field shear value was used. Turbulence parameters are defined using a gyrokinetic simulation of the experiments with ELMFIRE code. Modeling results are in good agreement with experiments. Using the data obtained from the modeling, non-linear particle flux dependency on density gradient was analyzed; the existence of two stabile solutions for two confinement modes dependent on particle flux value was proved, in agreement with experiments.

AlkuperäiskieliEnglanti
Artikkeli112007
Sivumäärä9
JulkaisuNuclear Fusion
Vuosikerta58
Numero11
DOI - pysyväislinkit
TilaJulkaistu - marraskuuta 2018
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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