scholarly journals Interpreting the Hydrogen IR Lines – Impact of Improved Electron Collision Data

2006 ◽  
pp. 225-230
Author(s):  
Norbert Przybilla ◽  
Keith Butler
Keyword(s):  
Electron Collision

Effects of temperature and electron collision frequency on the elastic electron–ion collisions in a collisional plasma

2013 ◽  
Vol 79 (5) ◽  
pp. 553-558 ◽  
Author(s):  
YOUNG-DAE JUNG ◽  
WOO-PYO HONG
Keyword(s):  
Phase Shift ◽  
Temperature Effect ◽  
Cross Section ◽  
Collision Frequency ◽  
Electron Collision ◽  
Elastic Electron ◽  
Dynamic Temperature ◽  
Electron Collision Frequency ◽  
Dynamic Screening ◽  
Ion Collision

AbstractThe effects of dynamic temperature and electron–electron collisions on the elastic electron–ion collision are investigated in a collisional plasma. The second-order eikonal analysis and the velocity-dependent screening length are employed to derive the eikonal phase shift and eikonal cross section as functions of collision energy, electron collision frequency, Debye length, impact parameter, and thermal energy. It is interesting to find out that the electron–electron collision effect would be vanished; however, the dynamic temperature effect is included in the first-order approximation. We have found that the dynamic temperature effect strongly enhances the eikonal phase shift as well as the eikonal cross section for electron–ion collision since the dynamic screening increases the effective shielding distance. In addition, the detailed characteristic behavior of the dynamic screening function is also discussed.

Study of turbulence in the high betap discharge using only RF heating on EAST

2022 ◽  
Author(s):  
shuyu Zheng ◽  
Debing Zhang ◽  
Erbing Xue ◽  
Limin Yu ◽  
Xianmei Zhang ◽  
...  
Keyword(s):  
Electron Collision ◽  
Rf Heating ◽  
Plasma Parameters ◽  
Equilibrium Data ◽  
Electron Mode ◽  
Radio Frequency Waves ◽  
Thermal Diffusivities ◽  
Gyrokinetic Simulations ◽  
Trapped Electron ◽  
Scale Length

Abstract High poloidal beta scenarios with favorable energy confinement (β_p~1.9, H_98y2~1.4) have been achieved on Experimental Advanced Superconducting Tokamak (EAST) using only radio frequency waves heating. Gyrokinetic simulations are carried out with experimental plasma parameters and tokamak equilibrium data of a typical high β_p discharge by the GTC code. Linear simulations show that electron temperature scale length and electron density scale length destabilize the turbulence, collision effects stabilize the turbulence, and the instability propagates in the electron diamagnetic direction. These indicate that the dominant instability in the core of high β_p plasma is collisionless trapped electron mode. Ion thermal diffusivities calculated by nonlinear gyrokinetic simulations are consistent with the experimental value, in which the electron collision effects play an important role. Further analyses show that instabilities with k_θ ρ_s>0.38 are suppressed by collision effects and collision effects reduce the radial correlation length of turbulence, resulting in the suppression of the turbulence.

Quasi-monochromatic spectral emission characteristics from electron collision with tightly focused laser pulses

Laser Physics ◽  
2021 ◽  
Vol 31 (3) ◽  
pp. 035401
Author(s):  
Jiawei Zhuang ◽  
Yilv Yan ◽  
Xi Zhou ◽  
Zujie Chen ◽  
Shanling Ren ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Electron Collision ◽  
Emission Characteristics ◽  
Spectral Emission

scholarly journals Electron collision cross sections for tetraethoxysilane

2002 ◽  
Vol 92 (3) ◽  
pp. 1663-1667 ◽  
Author(s):  
W. Lowell Morgan ◽  
Carl Winstead ◽  
Vincent McKoy
Keyword(s):  
Cross Sections ◽  
Electron Collision ◽  
Collision Cross Sections

Signs of quantum statistical effects in electron collision

1998 ◽  
Vol 249-251 ◽  
pp. 152-156 ◽  
Author(s):  
R.C. Liu ◽  
Y. Yamamoto ◽  
S. Tarucha
Keyword(s):  
Electron Collision ◽  
Quantum Statistical ◽  
Statistical Effects

scholarly journals INVERSE SCATTERING THEORY FOR ELECTRON COLLISION WITH ATOMS AND MOLECULES

1994 ◽  
Vol 43 (11) ◽  
pp. 1759
Author(s):  
CHEN XUE-JUN ◽  
WANG YAN ◽  
LI BO ◽  
DENG XIN-YUAN
Keyword(s):  
Inverse Scattering ◽  
Scattering Theory ◽  
Electron Collision ◽  
Atoms And Molecules ◽  
Inverse Scattering Theory

scholarly journals AN APPLICATION OF MICROWAVES REFRACTION FOR INHOMOGENEOUS PLASMA DIAGNOSTIC

2021 ◽  
pp. 163-170
Author(s):  
Y.V. Siusko ◽  
Yu.V. Kovtun
Keyword(s):  
Inhomogeneous Plasma ◽  
Average Density ◽  
Electron Collision ◽  
Plasma Diagnostic ◽  
Plasma Parameters ◽  
Peripheral Plasma ◽  
Electron Collision Frequency ◽  
Microwave Diagnostics ◽  
The Magnetic Field

A brief review of the main microwave diagnostics methods of inhomogeneous plasma based on the refraction of microwaves is given. These methods make it possible to determine the plasma density distribution, the magnetic field distribution, the electron collision frequency, and the electron temperature profile. In addition, the determination of the average density of the peripheral plasma layers and the local inhomogeneities of the rotating plasma are also possible. The effect of refraction on the accuracy of determining the plasma parameters by using microwave methods for plasma diagnostics is considered.

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