Stability analysis of H-mode pedestal and edge localized modes in a Joint European Torus power scan

2004 ◽  
Vol 11 (4) ◽  
pp. 1469-1475 ◽  
Author(s):  
Thawatchai Onjun ◽  
Arnold H. Kritz ◽  
Glenn Bateman ◽  
Vassili Parail ◽  
Howard Wilson ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Localized Modes ◽  
Edge Localized Modes

The model of synchronization between internal reconnections and edge-localized modes

2021 ◽  
Author(s):  
Viktor Bulanin ◽  
Gleb Kurskiev ◽  
Vladimir Solokha ◽  
Alexander Yashin ◽  
Nikita Sergeevich Zhiltsov
Keyword(s):  
Stability Analysis ◽  
Numerical Analysis ◽  
Experimental Evidence ◽  
Penetration Depth ◽  
Current Density ◽  
Induced Current ◽  
Localized Modes ◽  
Excess Current ◽  
Edge Localized Modes ◽  
Magnetic Equilibrium

Abstract A new model for interaction between the internal reconnections caused by sawtooth and the edge-localized modes (ELM) was presented. The experimental evidence of the coupling between sawtooth crash and ELM events were observed in the Globus-M and Globus-M2 tokamaks. The numerical analysis of magnetic equilibrium showed that internal reconnections can induce the excess current density near the separatrix during the several hundreds of μs. The excess current destabilizes the peeling-ballooning instability. The peeling-ballooning stability analysis showed that the penetration depth of the induced current should be in the range of ψnorm = 0.8 - 0.95 to trigger the instability.

Mechanical Performances of ITER In-Vessel Coil’s Conductor

2013 ◽  
Author(s):  
Huan Jin ◽  
Wu Yu ◽  
Feng Long ◽  
Min Yu ◽  
Qiyang Han ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Strong Coupling ◽  
Thermal Fatigue ◽  
Work Conditions ◽  
Nuclear Radiation ◽  
Localized Modes ◽  
Edge Localized Modes ◽  
Point Bend ◽  
Mechanical Performances

The design and R&D for ITER In-Vessel Coils (IVCs) is being deployed. The concerned issue of “Edge Localized Modes” (ELMs) and “Vertical Stabilization” (VS) of the ITER plasma can be addressed by the implemented IVCs. The ELM and VS coils will be installed in the vessel just behind the blanket shield modules to reach the requirement of keeping strong coupling with the plasma. The 59mm Stainless Steel Jacketed Mineral Insulated Conductor (SSMIC) using MgO as the insulation is being designed for the IVCs to resist the special challenges, including the nuclear radiation, high temperature, electromagnetic and thermal fatigue. It is necessary to take the mechanical performances of the SSMIC and the feasibility of fabrication techniques into consideration of the R&D program. The mechanical performances of the SSMIC close to the actual work conditions, including the three point bend modulus, three point bend cyclical performance and the cyclical performance with a U-bend sample of the SSMIC prototypes have been investigated and the results are presented in this paper.

scholarly journals On the onset of type I edge localized modes

2009 ◽  
Vol 49 (4) ◽  
pp. 049801
Author(s):  
G.Y Antar ◽  
S.I Krasheninnikov ◽  
P.B Snyder ◽  
R.A Moyer ◽  
R Pugno ◽  
...  
Keyword(s):  
Type I ◽  
Localized Modes ◽  
Edge Localized Modes

scholarly journals TRACKING DOWN LOCALIZED MODES IN PT-SYMMETRIC HAMILTONIANS UNDER THE INFLUENCE OF A COMPETING NONLINEARITY

2014 ◽  
Vol 54 (2) ◽  
pp. 79-84 ◽  
Author(s):  
Bijan Bagchi ◽  
Subhrajit Modak ◽  
Prasanta K. Panigrahi
Keyword(s):  
Growth Rate ◽  
Refractive Index ◽  
Stability Analysis ◽  
Linear Stability Analysis ◽  
Time Reversal ◽  
Time Parameter ◽  
Optical Systems ◽  
Localized Modes ◽  
Symmetric Structures ◽  
Schrödinger System

The relevance of parity and time reversal (PT)-symmetric structures in optical systems has been known for some time with the correspondence existing between the Schrödinger equation and the paraxial equation of diffraction, where the time parameter represents the propagating distance and the refractive index acts as the complex potential. In this paper, we systematically analyze a normalized form of the nonlinear Schrödinger system with two new families of PT-symmetric potentials in the presence of competing nonlinearities. We generate a class of localized eigenmodes and carry out a linear stability analysis on the solutions. In particular, we find an interesting feature of bifurcation characterized by the parameter of perturbative growth rate passing through zero, where a transition to imaginary eigenvalues occurs.

scholarly journals Comparison of small edge-localized modes on MAST and ASDEX Upgrade

2011 ◽  
Vol 53 (9) ◽  
pp. 095008 ◽  
Author(s):  
A Kirk ◽  
H W Muller ◽  
E Wolfrum ◽  
H Meyer ◽  
A Herrmann ◽  
...  
Keyword(s):  
Localized Modes ◽  
Edge Localized Modes

scholarly journals Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations

2012 ◽  
Vol 109 (3) ◽  
Author(s):  
Y. M. Jeon ◽  
J.-K. Park ◽  
S. W. Yoon ◽  
W. H. Ko ◽  
S. G. Lee ◽  
...  
Keyword(s):  
Localized Modes ◽  
Magnetic Perturbations ◽  
Edge Localized Modes

scholarly journals On L to H-mode transitions of the tokamak and entropy reduction

2006 ◽  
Vol 21 (2) ◽  
pp. 14-20 ◽  
Author(s):  
Danilo Rastovic
Keyword(s):  
Present State ◽  
Invariant Manifolds ◽  
Localized Modes ◽  
Ideal Case ◽  
Edge Localized Modes ◽  
Entropy Reduction ◽  
Mode Transitions

In an ideal case, it is assumed that the models for tokamak and stellarator plasma behaviour lead to the theory of invariant manifolds by Rastovic [Chaos, Solitons & Fractals, 2007]. But, at the present state of knowledge a more realistic concept for describing L to H transitions and edge localized modes is the reduction of entropy and appropriate methods.

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