Control of Heat and Mass Transfers Due to Tearing Mode-Based Magnetic Islands During Disruption Phase in IR-T1 Tokamak

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
R. Sadeghi ◽  
A. Salar Elahi ◽  
M. Ghoranneviss ◽  
M. K. Salem
Keyword(s):  
Energy Content ◽  
Singular Value ◽  
Mode Analysis ◽  
Magnetic Fluctuations ◽  
Magnetic Islands ◽  
Tearing Mode ◽  
Tearing Modes ◽  
Complete Disruption ◽  
Value Decomposition ◽  
Mass Transfers

A structural change of perturbed magnetic configurations (such as magnetic islands) during disruption phase in IR-T1 tokamak was studied. The singular value decomposition (SVD) mode analysis and the (m,n) modes identification were presented. We also presented the SVD technique to analyze the tokamak magnetic fluctuations, time evolution of magnetohydrodynamics (MHD) modes, spatial structure of each time vector, and the energy content of each modes. We also considered different scenarios for plasma from steady-state to predisruption, complete disruption, creation of tearing modes, and finally magnetic islands.

The effect of biased limiter on the magnetic island width in tokamak plasma

2013 ◽  
Vol 80 (1) ◽  
pp. 113-130 ◽  
Author(s):  
M. Ghasemloo ◽  
M. Ghoranneviss ◽  
M. K. Salem
Keyword(s):  
Negative Polarity ◽  
Singular Value ◽  
Tokamak Plasma ◽  
Plasma Stability ◽  
Minimal Effect ◽  
Positive Polarity ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Wavelet Techniques ◽  
Value Decomposition

AbstractIn this work the effects of Cold Biased Limiter (CBL) and Emissive Biased Limiter (EBL) have been individually investigated, in both positive and negative polarities, on the width and frequency of magnetic islands. The effects were examined using singular value decomposition and wavelet techniques on mirnov coil signals. The results show that the application of EBL with both positive and negative polarities has been more effective on plasma stability compared with CBL. Comparing different polarities of CBL and EBL revealed that the positive polarity was more effective on the width of magnetic islands than negative polarity. The greatest impact occurs during EBL with positive polarity, in which reduction is observed in both width of magnetic islands and emission of Hα radiation. Besides, intensity and frequency of magnetic islands are reduced from 50 to 25 kHz in around 1 ms after bias application. Meanwhile, the minimal effect on width and frequency of magnetic field occurs in CBL with negative polarity.

Improving TF-IDF with Singular Value Decomposition (SVD) for Feature Extraction on Twitter

2017 ◽  
Author(s):  
Ammar Ismael Kadhim ◽  
Yu-N Cheah ◽  
Inaam Abbas Hieder ◽  
Rawaa Ahmed Ali
Keyword(s):  
Feature Extraction ◽  
Singular Value Decomposition ◽  
Singular Value ◽  
Value Decomposition

Multi-scale singular value decomposition polarization image fusion defogging algorithm and experiment

2020 ◽  
Vol 13 (6) ◽  
pp. 1-10
Author(s):  
ZHOU Wen-zhou ◽  
◽  
FAN Chen ◽  
HU Xiao-ping ◽  
HE Xiao-feng ◽  
...  
Keyword(s):  
Singular Value Decomposition ◽  
Image Fusion ◽  
Singular Value ◽  
Multi Scale ◽  
Polarization Image ◽  
Value Decomposition
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