scholarly journals Onset of internal transport barriers in tokamaks

2021 ◽  
Vol 28 (8) ◽  
pp. 082305
Author(s):  
L. A. Osorio ◽  
M. Roberto ◽  
I. L. Caldas ◽  
R. L. Viana ◽  
Y. Elskens
Keyword(s):  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Internal Transport

Bursty transport in tokamak turbulence: Role of zonal flows and internal transport barriers

2001 ◽  
Vol 41 (8) ◽  
pp. 995-1001 ◽  
Author(s):  
S. Benkadda ◽  
P. Beyer ◽  
N. Bian ◽  
C. Figarella ◽  
O. Garcia ◽  
...  
Keyword(s):  
Zonal Flows ◽  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Internal Transport

The ITB dynamics controlled by internal kink modes on HL-2A tokamak

2021 ◽  
Author(s):  
Xiaoxue He ◽  
Longwen Yan ◽  
Deliang Yu ◽  
Wei Chen ◽  
Liming Yu ◽  
...  
Keyword(s):  
High Performance ◽  
Fusion Reactor ◽  
Rotation Velocity ◽  
Plasma Current ◽  
Ion Temperature ◽  
Lower Plasma ◽  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Foot Position ◽  
Internal Transport

Abstract The active control of internal transport barriers (ITBs) is an important issue to achieve high performance plasma in a fusion reactor. A critical challenge of ITB control is to increase the ITB position. The ITBs with internal kink modes (IKMs), such as fishbone instability and long-live mode (LLM) with mode number of m/n = 1/1 are frequently observed on HL-2A tokamak in neutral beam heated discharges. The correlation of fishbone instability/LLM with ITBs is analyzed in order to extend the ITB radius. It has been revealed that fishbone instability and LLM are often excited after the ITB formation. Therefore, fishbone instability and LLM play no role in triggering ITBs on HL-2A tokamak. On the other hand, they may slow down the outward radial expansion and then shrink the foot position of ITB, and damp the gradient growth of ion temperature and rotation velocity. Since the perturbation of LLM is weaker than that of fishbone instability, the shrinking effect of ITB foot and braking effect on gradient growth are slighter than those of fishbone instability. Compared with the LLM, fishbone instability routinely appears in plasmas with lower density, higher heating power and lower plasma current. In addition, large ITBs without IKMs are also discussed on HL-2A tokamak. The large ITB is the largest one, the fishbone ITB is the strongest one and the LLM ITB is the widest one in three ITBs, where the ‘large’, ‘strong’ and ‘wide’ qualifications correspond to ITB position ρITB, the normalized temperature gradient R/LT, and its width W/a. Therefore, the large ITB position may be obtained if the IKMs are effectively controlled in a tokamak.

Dynamics and control of internal transport barriers in reversed shear discharges

1998 ◽  
Vol 5 (4) ◽  
pp. 938-952 ◽  
Author(s):  
D. E. Newman ◽  
B. A. Carreras ◽  
D. Lopez-Bruna ◽  
P. H. Diamond ◽  
V. B. Lebedev
Keyword(s):  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Dynamics And Control ◽  
And Control ◽  
Reversed Shear ◽  
Internal Transport
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