Heat and Particle Transport in the Initial Phase of Ohmic Discharges in the Globus-M Spherical Tokamak

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Abstract

The results of experiments and simulations of the transport of heat and particles in the Globus-M spherical tokamak are presented. Investigations were carried out in the ohmic mode in hydrogen and deuterium plasma. It is shown that in the phase of current growth under the same initial conditions, as long as the condition is met at which the minimum of the safety factor exceeds unity, two scenarios of discharge development are possible: with an electron temperature dive or with an electron density peak. After the safety factor reaches the value of 1, the differences are no longer observed. Modeling of transport processes using the ASTRA code showed that the dive of the electron temperature and density is a consequence of the decrease in the transport of heat and particles in the plasma core (i.e., the presence of internal transport barriers).

About the authors

A. Yu. Tel’nova

Ioffe Physical Technical Institute

Author for correspondence.
Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

G. S. Kurskiev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

N. N. Bakharev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

V. K. Gusev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

E. O. Kiselev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

V. B. Minaev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

I. V. Miroshnikov

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

M. I. Patrov

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

Yu. V. Petrov

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

N. V. Sakharov

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

V. A. Tokarev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

S. Yu. Tolstyakov

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

E. A. Tukhmeneva

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

N. A. Khromov

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

P. B. Shchegolev

Ioffe Physical Technical Institute

Email: anna.telnova@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021

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