Introduction to Neoclassical Tearing Modes and the Role of Rotation

2011 ◽  
Vol 59 (3) ◽  
pp. 526-538
Author(s):  
Abhijit Sen
Keyword(s):  
Tearing Modes

scholarly journals A one-dimensional tearing mode equation for pedestal stability studies in tokamaks

2018 ◽  
Vol 84 (3) ◽  
Author(s):  
J. W. Connor ◽  
R. J. Hastie ◽  
C. Marchetto ◽  
C. M. Roach
Keyword(s):  
Cross Section ◽  
Approximate Equation ◽  
Stability Studies ◽  
Dimensional Model ◽  
Tearing Mode ◽  
One Dimensional ◽  
Tearing Modes ◽  
The Stability ◽  
Poloidal Flux

Starting from expressions in Connor et al. (Phys. Fluids, vol. 31, 1988, p. 577), we derive a one-dimensional tearing equation similar to the approximate equation obtained by Hegna & Callen (Phys. Plasmas, vol. 1, 1994, p. 2308) and Nishimura et al. (Phys. Plasmas, vol. 5, 1998, p. 4292), but for more realistic toroidal equilibria. The intention is to use this approximation to explore the role of steep profiles, bootstrap currents and strong shaping in the vicinity of a separatrix, on the stability of tearing modes which are resonant in the H-mode pedestal region of finite aspect ratio, shaped cross-section tokamaks, e.g. the Joint European Torus (JET). We discuss how this one-dimensional model for tearing modes, which assumes a single poloidal harmonic for the perturbed poloidal flux, compares with a model that includes poloidal coupling Fitzpatrick et al. (Nucl. Fusion, vol. 33, 1993, p. 1533).

On Prediction for Structural Performance of Ship Side Structures in Head-On Collision Scenario

2015 ◽  
Author(s):  
Bin Sun ◽  
Zhiqiang Hu ◽  
Jin Wang
Keyword(s):  
Deformation Mechanism ◽  
Analytical Method ◽  
Structural Design ◽  
Deformation Process ◽  
Predictive Accuracy ◽  
Structural Performance ◽  
Resistance Force ◽  
Tearing Modes ◽  
Deformation Modes

The crashworthiness of ship side structures should be taken into consideration during the structural design phase. When a ship is struck by a head-on collision, the main participants of the side structures include outer plating, longitudinal girders, transverse frames and the stiffeners attached on them. This paper is centered on establishing an integrated deformation mechanism program by identifying the theoretical deformation modes of the side structures, including the plating and stiffeners. The primary failure models of plating structures are the crushing, stretching and tearing modes, and a new crushing model of side plating structures subject to an ellipsoid-shaped indenter is proposed. As for the stiffeners on outer plating, the smeared thickness method is often used, but the role of the stiffeners cannot be traced clearly during the deformation process and the structural performance predictive accuracy may not be guaranteed. Therefore, a theoretical model of stiffeners is established in this paper, on purpose of providing deep insight of the deformation mechanism with reasonable accuracy. The expressions of resistance force of the side structures are also derived based on a study of the progressive deformation process of numerical simulation results and the plastic analytical methods. The accuracy of the analytical method is verified by numerical simulations using code LS_DYNA. The proposed analytical method can be used for quick assessment of the performances of ship side structures during ship collision.

Role of the pressure force in the explosive dynamics of magnetic islands in double tearing modes

2011 ◽  
Vol 18 (10) ◽  
pp. 102112 ◽  
Author(s):  
M. Janvier ◽  
A. Ishizawa ◽  
J. Li ◽  
Y. Kishimoto
Keyword(s):  
Magnetic Islands ◽  
Pressure Force ◽  
Tearing Modes

Role of anomalous transport in onset and evolution of neoclassical tearing modes

2005 ◽  
Vol 47 (12B) ◽  
pp. B223-B236 ◽  
Author(s):  
S V Konovalov ◽  
A B Mikhailovskii ◽  
T Ozeki ◽  
T Takizuka ◽  
M S Shirokov ◽  
...  
Keyword(s):  
Anomalous Transport ◽  
Tearing Modes

Resonant absorption of Alfvén waves near a neutral point

1994 ◽  
Vol 52 (2) ◽  
pp. 215-221 ◽  
Author(s):  
C. Uberoi
Keyword(s):  
Surface Waves ◽  
Resonant Absorption ◽  
Alfven Waves ◽  
Neutral Point ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Tearing Mode ◽  
Tearing Modes ◽  
Symmetric Surface

It is shown that, although the mathematical analysis of the Alfvén-wave equation does not show any variation at non-zero or zero singular points, the role of surface waves in the physical mechanism of resonant absorption of Alfvén waves is very different at these points. This difference becomes even greater when resistivity is taken into account. At the neutral point the zero-frequency surface waves that are symmetric surface modes of the structured neutral layer couple to the tearing mode instability of the layer. The importance of this study for the energy balance in tearing modes and the association of surface waves with driven magnetic reconnection is also pointed out.

Onset of tearing modes in plasma termination on JET: the role of temperature hollowing and edge cooling

2021 ◽  
Author(s):  
Gianluca Pucella ◽  
Paolo Buratti ◽  
Edmondo Giovannozzi ◽  
Edoardo Alessi ◽  
Fulvio Auriemma ◽  
...  
Keyword(s):  
Tearing Modes

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

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