scholarly journals Measurements of the cross-phase angle between density and electron temperature fluctuations and comparison with gyrokinetic simulations

2010 ◽  
Vol 17 (5) ◽  
pp. 056103 ◽  
Author(s):  
A. E. White ◽  
W. A. Peebles ◽  
T. L. Rhodes ◽  
C. H. Holland ◽  
G. Wang ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Phase Angle ◽  
Temperature Fluctuations ◽  
The Cross ◽  
Gyrokinetic Simulations

scholarly journals Quantitative comparison of electron temperature fluctuations to nonlinear gyrokinetic simulations in C-Mod Ohmic L-mode discharges

2016 ◽  
Vol 23 (4) ◽  
pp. 042303 ◽  
Author(s):  
C. Sung ◽  
A. E. White ◽  
D. R. Mikkelsen ◽  
M. Greenwald ◽  
C. Holland ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Quantitative Comparison ◽  
Gyrokinetic Simulations

scholarly journals Validation of gyrokinetic simulations with measurements of electron temperature fluctuations and density-temperature phase angles on ASDEX Upgrade

2018 ◽  
Vol 25 (5) ◽  
pp. 055903 ◽  
Author(s):  
S. J. Freethy ◽  
T. Görler ◽  
A. J. Creely ◽  
G. D. Conway ◽  
S. S. Denk ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Temperature Phase ◽  
Phase Angles ◽  
Gyrokinetic Simulations

scholarly journals Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak

2013 ◽  
Vol 110 (4) ◽  
Author(s):  
J. C. Hillesheim ◽  
J. C. DeBoo ◽  
W. A. Peebles ◽  
T. A. Carter ◽  
G. Wang ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations

Passive scalar dispersion and mixing in a turbulent jet

1995 ◽  
Vol 292 ◽  
pp. 1-38 ◽  
Author(s):  
Chenning Tong ◽  
Z. Warhaft
Keyword(s):  
Reynolds Number ◽  
Cross Correlation ◽  
Thermal Field ◽  
Temperature Fluctuations ◽  
Passive Scalar ◽  
Turbulent Jet ◽  
Grid Turbulence ◽  
Far Field ◽  
The Cross ◽  
Heated Jet

The dispersion and mixing of passive scalar (temperature) fluctuations is studied in a turbulent jet. The temperature fluctuations were produced by heated fine wire rings placed axisymmetrically in the flow. Typically the ring diameters were of the same order as the jet, Dj, and they were placed in the self-similar region. However, other initial conditions were studied, including a very small diameter ring used to approximate a point source. Using a single ring to study dispersion (which is analogous to placing a line source in a planar flow such as grid turbulence), it was found that the intense local thermal field close to the ring disperses and fills the whole jet in approximately 1.5 eddy turnover times. Thereafter the thermal field evolves in the same way as for the traditional heated jet experiments. Two heated rings were used to study the mixing of two independently introduced scalar fields. Here an inference method (invoking the principle of superposition) was used to determine the evolution of the cross-correlation coefficient, ρ, and the segregation parameter, α, as well as the coherence and co-spectrum. While initially strongly dependent on ring locations and spacing, ρ and α reached asymptotic values of 1 and 0.04, respectively, also in about 1.5 eddy turnover times. These results are contrasted with mixing and dispersion in grid turbulence where the evolution is slower. Measurements in the far field of the jet (where ρ = 1) of the square of the scalar derivative conditioned on the scalar fluctuation itself, as well as other conditional statistics, showed strong dependence on the measurement location, as well as the direction in which the derivative was determined. The cross-correlation between the square of the scalar derivative and the signal showed a clear Reynolds-number trend, decreasing as the jet Reynolds number was varied from 2800 to 18 000. The far-field measurements, using the heated rings, were corroborated by new heated jet experiments.

Mode structure of turbulent electron temperature fluctuations in the Texas Experimental Tokamak Upgrade

1998 ◽  
Vol 5 (12) ◽  
pp. 4117-4120 ◽  
Author(s):  
B. H. Deng ◽  
D. L. Brower ◽  
G. Cima ◽  
C. W. Domier ◽  
N. C. Luhmann ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Mode Structure

Imaging of core electron temperature fluctuations of tokamak plasmas

2002 ◽  
Vol 30 (1) ◽  
pp. 72-73 ◽  
Author(s):  
B.H. Deng ◽  
D.L. Brower ◽  
G. Cima ◽  
C.W. Domier ◽  
A.J.H. Donne ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Tokamak Plasmas ◽  
Core Electron

scholarly journals Measuring Δ′ from electron temperature fluctuations in the Tokamak Fusion Test Reactor

1998 ◽  
Vol 5 (2) ◽  
pp. 450-454 ◽  
Author(s):  
C. Ren ◽  
J. D. Callen ◽  
T. A. Gianakon ◽  
C. C. Hegna ◽  
Z. Chang ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Test Reactor
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