Modification of tokamak edge plasma turbulence and transport by biasing and resonant helical magnetic field

2013 ◽  
Vol 84 (5) ◽  
pp. 053504 ◽  
Author(s):  
Mansoureh Lafouti ◽  
Mahmood Ghoranneviss ◽  
Sakineh Meshkani ◽  
Ahmad Salar Elahi
Keyword(s):  
Magnetic Field ◽  
Plasma Turbulence ◽  
Edge Plasma ◽  
Tokamak Edge ◽  
Helical Magnetic Field

Approaching to the ideal condition of plasma confinement by applying external resonant fields in IR-T1 tokamak

2015 ◽  
Vol 81 (3) ◽  
Author(s):  
Sakineh Meshkani ◽  
Mahmood Ghoranneviss ◽  
Mansoureh Lafouti
Keyword(s):  
Magnetic Field ◽  
Turbulent Transport ◽  
Edge Plasma ◽  
Ideal Condition ◽  
Plasma Confinement ◽  
Applied Bias ◽  
Inverse Results ◽  
Electric And Magnetic Field ◽  
Helical Magnetic Field ◽  
The Ideal

For understanding the effect of resonant helical magnetic field (RHF) and bias on the edge plasma turbulent transport, the radial and poloidal electric field (Er, EP), poloidal and toroidal magnetic field (BP, Br) were detected by the Langmuir probe, magnetic probe and diamagnetic loop. The poloidal, toroidal and radial velocity (VP, Vr, Vt) can be determined from the electric and magnetic field. In the present work, we have investigated the effect of the magnitude of bias (Vbias = 200v, Vbias = 320v) on Er, EP, BP, Bt, VP, Vr, Vt. Moreover, we applied RHF with L = 2, L = 3 and L = 2 and 3 and investigate the effect of the helical windings radius on above parameters. Also, the experiment was repeated by applying the positive biasing potentials and RHF's simultaneously. The results show that by applying bias to the plasma at t = 15 msec at r/a = 0.9, Er, BP and Bt increase while EP decreases. The best modification occurs at Vbias = 200v. By applying RHF to the plasma, both the electric and magnetic field vary. Er reaches the highest in the presence of RHF with L = 3. The same results are obtained for BP, Bt, VP and Vt. While the inverse results are obtained for EP and Vr. Finally, RHF and bias are applied simultaneously to the plasma. With applied bias with Vbias = 200v and RHF with L = 2 and 3, we reach to the ideal circumstance. The same results obtain in the situation with Vbias = 320v and RHF with L = 2 and 3.

Analysis of the radial and poloidal turbulent transport in the edge tokamak plasma

2013 ◽  
Vol 79 (5) ◽  
pp. 647-655 ◽  
Author(s):  
S. MESHKANI ◽  
M. GHORANNEVISS ◽  
M. LAFOUTI ◽  
A. SALAR ELAHI
Keyword(s):  
Magnetic Field ◽  
Turbulent Transport ◽  
Edge Plasma ◽  
Tokamak Plasma ◽  
Spectral Features ◽  
Negative Bias ◽  
Langmuir Probes ◽  
Negative Bias Voltage ◽  
Helical Magnetic Field ◽  
Transport Method

AbstractIn this paper, turbulent transport in the edge plasma of the IR-T1 tokamak (r/a = 0.9) in the presence of a resonant helical magnetic field (RHF) and a biased limiter has been investigated and analyzed. The time evolution of potential fluctuation, and electric field and turbulent transport have been measured by using two arrays of the Langmuir probes in both the radial and poloidal directions. The experiments have been done in different regimes such as limiter biasing and RHF, and both of them. The analyses have been done by the fast Fourier transport method and their spectral features are obtained with the help of the standard autocorrelation technique. The results show that radial turbulent transport decreases about 60% after positive biasing application, while it increases about 40% after negative biasing. The effect of positive biasing on poloidal turbulent transport displays an increase of about 55%, while the negative bias voltage decreases the poloidal turbulent transport about 30%. Consequently, confinement is improved and plasma density rises significantly due to the applied positive biasing in IR-T1. However, the results are reversed when negative biasing is applied. Also, in this work, the results of the applied RHF (L = 3) are compared with biasing results and analyzed.

Effect of rotating helical magnetic field on the turbulence fractal structure and transport in the tokamak edge

2003 ◽  
Vol 313-316 ◽  
pp. 1309-1313 ◽  
Author(s):  
V.P. Budaev ◽  
Y. Kikuchi ◽  
M. Toyoda ◽  
Y. Uesugi ◽  
S. Takamura
Keyword(s):  
Magnetic Field ◽  
Fractal Structure ◽  
Tokamak Edge ◽  
Helical Magnetic Field

Anomalous impurity diffusion in models of tokamak edge plasma turbulence

2004 ◽  
Vol 54 (S3) ◽  
pp. C157-C163 ◽  
Author(s):  
L. Krlín ◽  
R. Pánek ◽  
P. Pavlo ◽  
V. Petrzílka ◽  
J. Stöckel ◽  
...  
Keyword(s):  
Plasma Turbulence ◽  
Impurity Diffusion ◽  
Edge Plasma ◽  
Tokamak Edge

scholarly journals A new high-order fluid solver for tokamak edge plasma transport simulations based on a magnetic-field independent discretization

2018 ◽  
Vol 58 (6-8) ◽  
pp. 688-695 ◽  
Author(s):  
G. Giorgiani ◽  
T. Camminady ◽  
H. Bufferand ◽  
G. Ciraolo ◽  
P. Ghendrih ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Order ◽  
Edge Plasma ◽  
Plasma Transport ◽  
Field Independent ◽  
Tokamak Edge

Issues of TOKAMAK Edge Plasma Transport and Plasma-material Interactions

2015 ◽  
Vol 6 (1-2) ◽  
pp. 86-91
Author(s):  
S. I. Krasheninnikov ◽  
J. Guterl ◽  
W. Lee ◽  
R. D. Smirnov ◽  
E. D. Marenkov ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Plasma Transport ◽  
Tokamak Edge ◽  
Plasma Material Interactions

scholarly journals Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minjun J. Choi ◽  
Lāszlo Bardōczi ◽  
Jae-Min Kwon ◽  
T. S. Hahm ◽  
Hyeon K. Park ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Nonlinear Evolution ◽  
Plasma Turbulence ◽  
Magnetized Plasmas ◽  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Reconnection Site ◽  
Ambient Turbulence

AbstractMagnetic islands (MIs), resulting from a magnetic field reconnection, are ubiquitous structures in magnetized plasmas. In tokamak plasmas, recent researches suggested that the interaction between an MI and ambient turbulence can be important for the nonlinear MI evolution, but a lack of detailed experimental observations and analyses has prevented further understanding. Here, we provide comprehensive observations such as turbulence spreading into an MI and turbulence enhancement at the reconnection site, elucidating intricate effects of plasma turbulence on the nonlinear MI evolution.

Reduction of edge plasma turbulence via cross-phase decrease by zonal fields

2019 ◽  
Vol 61 (8) ◽  
pp. 085024 ◽  
Author(s):  
Chang-Bae Kim ◽  
Chan-Yong An ◽  
Byunghoon Min
Keyword(s):  
Plasma Turbulence ◽  
Edge Plasma

Alfvén wave forces, affecting the tokamak edge plasma in the presence of impurities or dust

1997 ◽  
Vol 4 (9) ◽  
pp. 3436-3438 ◽  
Author(s):  
V. S. Tsypin ◽  
S. V. Vladimirov ◽  
A. G. Elfimov ◽  
M. Tendler ◽  
A. S. de Assis ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Alfven Wave ◽  
Wave Forces ◽  
Tokamak Edge
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