scholarly journals Reduction of Ion Thermal Diffusivity Inside a Magnetic Island in JT-60U Tokamak Plasma

2012 ◽  
Vol 109 (6) ◽  
Author(s):  
K. Ida ◽  
K. Kamiya ◽  
A. Isayama ◽  
Y. Sakamoto
Keyword(s):  
Thermal Diffusivity ◽  
Tokamak Plasma ◽  
Magnetic Island

The influence of the ion polarization current on magnetic island stability in a tokamak plasma

2006 ◽  
Vol 13 (12) ◽  
pp. 122507 ◽  
Author(s):  
R. Fitzpatrick ◽  
F. L. Waelbroeck ◽  
F. Militello
Keyword(s):  
Tokamak Plasma ◽  
Polarization Current ◽  
Magnetic Island

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.

scholarly journals Drift kinetic theory of neoclassical tearing modes in a low collisionality tokamak plasma: magnetic island threshold physics

2021 ◽  
Author(s):  
Alexandra V Dudkovskaia ◽  
Jack W Connor ◽  
David Dickinson ◽  
Peter Alec Hill ◽  
Koki Imada ◽  
...  
Keyword(s):  
Kinetic Theory ◽  
Tokamak Plasma ◽  
Magnetic Island ◽  
Tearing Modes

Photopyroelectric Measurement of the Thermal Diffusivity of Recrystallized High Purity Aluminum

1991 ◽  
Vol 3 (1) ◽  
pp. 69-80
Author(s):  
S. B. Peralta ◽  
S. C. Ellis ◽  
C. Christofides ◽  
A. Mandeiis ◽  
H. Sang ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
High Purity ◽  
High Purity Aluminum

THERMAL DIFFUSIVITY OF POLYMER FOILS - SEMICRYSTALLINE PETP AND PE - AS A FUNCTION OF DRAWING

1983 ◽  
Vol 44 (C6) ◽  
pp. C6-463-C6-467 ◽  
Author(s):  
B. Merté ◽  
P. Korpiun ◽  
E. Lüscher ◽  
R. Tilgner
Keyword(s):  
Thermal Diffusivity ◽  
Polymer Foils

About definition of the local entropy rate of production in experiment of pulse electric heating

2020 ◽  
pp. 29-34
Author(s):  
Alexandr V. Kostanovskiy ◽  
Margarita E. Kostanovskaya
Keyword(s):  
Thermal Diffusivity ◽  
Electric Heating ◽  
Thermal Capacity ◽  
Entropy Rate ◽  
Initial Time ◽  
Local Entropy ◽  
Linear Mode ◽  
Electric Capacity ◽  
Definition Of ◽  
Pulse Electric

Work is devoted to studying of a linear mode thermodynamic – a mode which is actively investigated now. One of the main concepts of a linear mode – local entropy rate of production. The purpose of given article consists in expansion of a circle of problems for which it is possible to calculate a local entropy rate of production, namely its definition, using the experimental “time-temperature” curves of heating/cooling. “Time-temperature” curves heating or cooling are widely used in non-stationary thermophysical experiments at studying properties of substances and materials: phase transitions of the first and second sort, a thermal capacity, thermal diffusivity. The quantitative substantiation of the formula for calculation of the local entropy rate of production in which it is used thermogram (change of temperature from time) which is received by a method of pulse electric heating is resulted. Initial time dependences of electric capacity and temperature are measured on the sample of niobium in a microsecond range simultaneously. Conformity of two dependences of the local entropy rate of production from time is shown: one is calculated under the known formula in which the brought electric capacity is used; another is calculated, using the thermogram.

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