Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations

2008 ◽  
Vol 15 (5) ◽  
pp. 056116 ◽  
Author(s):  
A. E. White ◽  
L. Schmitz ◽  
G. R. McKee ◽  
C. Holland ◽  
W. A. Peebles ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Density Fluctuations ◽  
Core Electron ◽  
Gyrokinetic Simulations

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 Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D

2010 ◽  
Vol 17 (2) ◽  
pp. 020701 ◽  
Author(s):  
A. E. White ◽  
L. Schmitz ◽  
W. A. Peebles ◽  
T. L. Rhodes ◽  
T. A. Carter ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Simultaneous Measurement ◽  
Density Fluctuations ◽  
Electron Cyclotron ◽  
Electron Cyclotron Heating ◽  
Core Electron

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

ELF-VLF EMISSIONS, ION DENSITY FLUCTUATIONS AND ELECTRON TEMPERATURE IN THE IONOSPHERIC TROUGH

1979 ◽  
pp. 339-342 ◽  
Author(s):  
Ja.I. Likhter ◽  
V.I. Larkina ◽  
Yu.M. Mikhailov ◽  
V.V. Afonin ◽  
G.L. Gdalevich ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Density Fluctuations ◽  
Ion Density ◽  
Vlf Emissions

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 Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 191
Author(s):  
Zeyun Li ◽  
Hanxian Fang ◽  
Hongwei Gong ◽  
Zhe Guo
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Parametric Instability ◽  
Density Fluctuations ◽  
Lower Hybrid ◽  
Langmuir Waves ◽  
Ionospheric Heating ◽  
Superthermal Electron ◽  
Temperature Electron ◽  
Electron Gyrofrequency

We present the observations of the artificial ionospheric heating experiment of EISCAT (European Incoherent Scatter Scientific Association) on 22 February 2012 in Tromsø, Norway. When the pump is operating near the fourth electron gyrofrequency, the UHF radar observation shows some strong enhancements in electron temperature, electron density, ion line, and the outshifted plasma lines. Based on some existing theories, we find the following: first, Langmuir waves scattering off lower hybrid density fluctuations and strong Langmuir turbulence (SLT) in the Zakharov model cannot completely explain the outshifted plasma lines, but the data suggest that this phenomenon is related to the cascade of the pump wave and should be researched further; second, the spatiotemporal consistency between the enhancement in electron density/electron temperature reaches up to three to four times that of the undisturbed state and HF-enhanced ion lines (HFILs) suggest that SLT excited by parametric instability plays a significant role in superthermal electron formation and electron acceleration; third, some enhancements in HFILs and HF-induced plasma lines (HFPLs) are generated by parametric decay instability (PDI) during underdense heating in the third cycle, we suggest that this is due to the existence of a second cut-off in the upper hybrid dispersion relation as derived from a kinetic description.

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
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