Influence of the safety factor profile on the particle and heat transport in the Globus-M spherical tokamak

A YU TELNOVA; G S KURSKIEV; E O KISELEV; N N BAKHAREV; V K GUSEV; N A KHROMOV; S YU MEDVEDEV; V B MIINAEV; I V MIROSHNIKOV; M I PATROV; Yu V PETROV; N V SAKHAROV; A D SLADKOMEDOVA; P B SHCHEGOLEV; V V SOLOKHA; V A TOKAREV; S YU TOLSTYAKOV; E A TUKHMENEVA

doi:10.1088/2058-6272/ab2ff6

Plasma Science and Technology > 2019 > 21(11): 115101. > DOI: 10.1088/2058-6272/ab2ff6

A YU TELNOVA, G S KURSKIEV, E O KISELEV, N N BAKHAREV, V K GUSEV, N A KHROMOV, S YU MEDVEDEV, V B MIINAEV, I V MIROSHNIKOV, M I PATROV, Yu V PETROV, N V SAKHAROV, A D SLADKOMEDOVA, P B SHCHEGOLEV, V V SOLOKHA, V A TOKAREV, S YU TOLSTYAKOV, E A TUKHMENEVA. Influence of the safety factor profile on the particle and heat transport in the Globus-M spherical tokamak[J]. Plasma Science and Technology, 2019, 21(11): 115101. DOI: 10.1088/2058-6272/ab2ff6

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Influence of the safety factor profile on the particle and heat transport in the Globus-M spherical tokamak

¹ Ioffe Institute, Saint-Petersburg 194021, Russia
² Keldysh Institute, Russian Academy of Sciences, Moscow 125047, Russia
³ NRC 'Kurchatov Institute', Moscow 123098, Russia

Funds: The research (radiation losses and TS measurements, data processing, and transport modeling using ASTRA code, NBI absorbed power and fast particle confinement estimation) was financially supported by an RSF research project (no. 17-72- 20076).

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Received Date: April 07, 2019
Revised Date: July 05, 2019
Accepted Date: July 07, 2019

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Abstract

Abstract

The advanced tokamak scenario is a promising operation scenario for ITER and fusion neutron sources. In this scenario the minimum value of the safety factor in the center of the plasma exceeds unity. In the compact spherical tokamak Globus-M, the formation of such conditions is possible with neutral beam injection at the current ramp-up phase. Due to the slower diffusion of current inside the plasma, a zone is formed with reduced heat and particle transport across the magnetic field, which affects the temperature and density profiles of the plasma. This leads to the peaked density profile formation and improvement of the energy confinement time. To achieve a high fraction of the bootstrap current, it is necessary to increase the plasma pressure. At the same time, the maximum allowable pressure is limited to the normalized beta limit.
- advanced tokamak mode,
- transport analysis,
- internal transport barriers

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Influence of the safety factor profile on the particle and heat transport in the Globus-M spherical tokamak