Dynamics of Core Electron Temperature Fluctuations during Sawtooth Oscillations on TEXT-U

1995 ◽  
Vol 75 (9) ◽  
pp. 1759-1762 ◽  
Author(s):  
Christopher Watts ◽  
R. F. Gandy
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Core Electron ◽  
Sawtooth Oscillations

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

Changes in core electron temperature fluctuations across the ohmic energy confinement transition in Alcator C-Mod plasmas

2013 ◽  
Vol 53 (8) ◽  
pp. 083010 ◽  
Author(s):  
C. Sung ◽  
A.E. White ◽  
N.T. Howard ◽  
C.Y. Oi ◽  
J.E. Rice ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Core Electron ◽  
Energy Confinement

Observation of reduced core electron temperature fluctuations and intermediate wavenumber density fluctuations in H-mode plasmas

2009 ◽  
Vol 49 (9) ◽  
pp. 095004 ◽  
Author(s):  
L. Schmitz ◽  
A.E. White ◽  
G. Wang ◽  
J.C. DeBoo ◽  
J.S. deGrassie ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuations ◽  
Density Fluctuations ◽  
Core Electron

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

scholarly journals Tests for coronal electron temperature signatures in suprathermal electron populations at 1 AU

2017 ◽  
Vol 35 (6) ◽  
pp. 1275-1291 ◽  
Author(s):  
Allan R. Macneil ◽  
Christopher J. Owen ◽  
Robert T. Wicks
Keyword(s):  
Solar Wind ◽  
Electron Temperature ◽  
Energy Content ◽  
The Sun ◽  
Particle Interactions ◽  
Core Electron ◽  
Suprathermal Electron ◽  
Electron Distributions ◽  
The Relationship ◽  
Coronal Electron

Abstract. The development of knowledge of how the coronal origin of the solar wind affects its in situ properties is one of the keys to understanding the relationship between the Sun and the heliosphere. In this paper, we analyse ACE/SWICS and WIND/3DP data spanning  > 12 years, and test properties of solar wind suprathermal electron distributions for the presence of signatures of the coronal temperature at their origin which may remain at 1 AU. In particular we re-examine a previous suggestion that these properties correlate with the oxygen charge state ratio O7+ ∕ O6+, an established proxy for coronal electron temperature. We find only a very weak but variable correlation between measures of suprathermal electron energy content and O7+ ∕ O6+. The weak nature of the correlation leads us to conclude, in contrast to earlier results, that an initial relationship with core electron temperature has the possibility to exist in the corona, but that in most cases no strong signatures remain in the suprathermal electron distributions at 1 AU. It cannot yet be confirmed whether this is due to the effects of coronal conditions on the establishment of this relationship or due to the altering of the electron distributions by processing during transport in the solar wind en route to 1 AU. Contrasting results for the halo and strahl population favours the latter interpretation. Confirmation of this will be possible using Solar Orbiter data (cruise and nominal mission phase) to test whether the weakness of the relationship persists over a range of heliocentric distances. If the correlation is found to strengthen when closer to the Sun, then this would indicate an initial relationship which is being degraded, perhaps by wave–particle interactions, en route to the observer.

scholarly journals Observation of core electron temperature rise in response to an edge cooling in toroidal helical plasmas

2005 ◽  
Vol 12 (11) ◽  
pp. 110705 ◽  
Author(s):  
N. Tamura ◽  
S. Inagaki ◽  
K. Ida ◽  
T. Shimozuma ◽  
S. Kubo ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Rise ◽  
Core Electron

scholarly journals Kinetic infernal modes for Wendelstein 7-X-like -profiles

2019 ◽  
Vol 85 (6) ◽  
Author(s):  
Alessandro Zocco ◽  
Alexey Mishchenko ◽  
Axel Könies
Keyword(s):  
Electron Temperature ◽  
High Performance ◽  
Ion Temperature ◽  
Electron Temperature Gradient ◽  
Average Value ◽  
Toroidal Plasma ◽  
Rotational Transform ◽  
Ideal Magnetohydrodynamic ◽  
The One ◽  
Sawtooth Oscillations

We show analytically that for $\unicode[STIX]{x1D704}$ -profiles similar to the one of the Wendelstein 7-X stellarator, where $\unicode[STIX]{x1D704}$ is the rotational transform of the equilibrium magnetic field, a highly conducting toroidal plasma is unstable to kinetically mediated pressure-driven long-wavelength reconnecting modes, of the infernal type. The modes are destabilized either by the electron temperature gradient or by a small amount of current, depending on how far from unity the average value of $\unicode[STIX]{x1D704}$ is, which is assumed to be slowly varying. We argue that, for W7-X, a broad mode with toroidal and poloidal mode numbers $(n,m)=(1,1)$ can be destabilized due to the strong geometric side-band coupling of the resonant kinetic electron response at locations where $\unicode[STIX]{x1D704}$ is rational for harmonics that belong to the mode family of the $(n,m)=(1,1)$ mode itself. In many regimes, the growth rate is insensitive to the plasma density, thus it is likely to persist in high performance W7-X discharges. For a peaked electron temperature, with a maximum of $T_{e}=5~\text{keV}$ , larger than the ion temperature, $T_{i}=2.5~\text{keV}$ , and a density $n_{0}=10^{19}~\text{m}^{-3}$ , instability is found in regimes which show plasma sawtooth activity, with growth rates of the order of tens of kiloHertz. Frequencies are either electron diamagnetic or of the ideal magnetohydrodynamic type, but sub-Alfvénic. The kinetic infernal mode is thus a good candidate for the explanation of sawtooth oscillations in present-day stellarators and poses a new challenge to the problem of stellarator reactor optimization.

Poloidal asymmetry and gradient drive in core electron density and temperature fluctuations on the Texas Experimental Tokamak‐Upgrade

1996 ◽  
Vol 3 (5) ◽  
pp. 2013-2021 ◽  
Author(s):  
Christopher Watts ◽  
R. F. Gandy ◽  
G. Cima ◽  
R. V. Bravenec ◽  
D. W. Ross ◽  
...  
Keyword(s):  
Electron Density ◽  
Temperature Fluctuations ◽  
Core Electron ◽  
Electron Density And Temperature
Sign in / Sign up

Export Citation Format

Share Document