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10-15 May 2021
Virtual Event
Europe/Vienna timezone
The Conference will be held virtually from 10-15 May 2021

Plasma Rotation Studies Carried out in the TCABR Tokamak and its Comparison with Neoclassic Theory

12 May 2021, 08:30
4h
Virtual Event

Virtual Event

Regular Poster Magnetic Fusion Experiments P3 Posters 3

Speaker

Jose Helder Severo (University of Sao Paulo)

Description

Plasma rotation in thermonuclear fusion plasma plays an important role for particle and energy confinement and it can stabilize magnetohydrodynamic instabilities if some rotation level is achieved. In early studies, the relation between plasma confinement and radial electric field E_r was studied via measurements of the electric potential distribution and also via spectroscopic measurements of plasma rotation. Since no significant effect of E_r on plasma confinement was observed, little attention was given to it. However, after the discovery of H-mode, the need for accurate measurements of E_r, and consequently, plasma rotation, became necessary. Nowadays, interest in the electric field, whether by its origin or by influence in plasma confinement, is one of the most current topics in nuclear fusion research.
In TCABR, plasma rotation has been measured using Doppler shift of both the C^{+5} spectral line emission (529.05 nm) [1-2]. In Figure 1, (b) poloidal and (c) toroidal rotation measurements of C^{+5}. In panels (a-b), C^{+5} poloidal rotation measurements are compared with the rotation profile expected from neoclassical theory. As can be seen, the observed C^{+5} poloidal rotation in TCABR is well described by neoclassical theory.
Plasma rotation in the presence of anomalous processes and toroidal momentum damping are introduced phenomenologically into neoclassic equations in [3]. So, the next phase of this work will focus on the estimation of radial electric field and the comparison of the toroidal velocity with the model proposed in [3-4].
(a) TCABR cross section showing the calculated poloidal rotation of C+5 impurity ions across the plasma. (b) Measured and calculated radial profile of poloidal rotation of C+5 impurity ions. (c) Measured radial profile of toroidal rotation of C5+ impurity ions. (d) Radial profiles of electron and C+5 ion temperatures. (e) Radial profiles of electron density and estimated ion density ni, C+5 and C+6 densities. (f) Line-integrated C+5 radiance, emissivity (from Abel inversion) and C+5 ion density.

ACKNOWLEDGMENTS
This work was supported by the São Paulo Research Foundation FAPESP
(proc: 2018/09734-0).

[1] J. H. F. Severo, et al Nuclear Fusion, vol. 43, no. 10, p. 1047, 2003.
[2] J. H. F. Severo, et al Nuclear Fusion, vol. 49, no. 11, p. 115026, 2009.
[3] V. I. Bugarya, et al Nuclear Fusion, vol. 25, no. 12, p. 1707, 1985.
[4] Rozhansky V and Tendler M 1996 " Plasma Rotation in Tokamak" in Rev. Plasma Physics v.19, ed. B.B.Kadomtsev (N.Y.:Consultans Bureau).

Affiliation Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil
Country or International Organization Brazil

Primary authors

Ms Tiago Fernandes (Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil) Jose Helder Severo (University of Sao Paulo) Dr Gustavo Canal (Institute of Physics of the University of São Paulo) Dr Alexei Yu Dnestrovskij (National Research Center “Kurchatov Institute”Moscow, 123182 Russia)

Co-authors

Gilson Ronchi (Institute of Physics, University of Sao Paulo) Dr Mikhail Yu. Kantor (Ioffe Institute, Saint-Petersburg 194021 Russia) Mrs Mayara Yumi Ikeda (Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil) Dr Fellype do Nascimento (Gleb Wataghin Physics Institute, State University of Campinas, Campinas SP CEP 13083-870, Brazil) Ricardo Galvao (University of Sao Paulo) Dr Cesar S Martins (Faculdade de Tecnologia de São Paulo FATEC-SP) Dr Valdemar Bellintani Jr. (Faculdade de Tecnologia de São Paulo FATEC-SP) Ms Alexandre M Oliveira (Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil) Dr Juan I. Elizondo (Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil) Dr Wanderley P. de Sá (Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil) Mr Fernando A. F. Albuquerque (Faculdade de Tecnologia de São Paulo FATEC-SP) Prof. Ivan C. Nascimento (Plasma Physics Laboratory, Institute of Physics, University of São Paulo, Brazil) Prof. Michael Tendler (Royal Institute Technol. Alfvén Lab., Stockholm, Sweden)

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