Growth rate and frequency dispersion characteristics of drift waves in an r.f. collisional plasma

1972 ◽  
Vol 5 (7) ◽  
pp. 1095-1107 ◽  
Author(s):  
B E Keen ◽  
M W Alcock
Keyword(s):  
Growth Rate ◽  
Frequency Dispersion ◽  
Collisional Plasma ◽  
Drift Waves ◽  
Dispersion Characteristics

Low-frequency dispersion characteristics of GaN HFETs

1995 ◽  
Vol 31 (22) ◽  
pp. 1951-1952 ◽  
Author(s):  
W. Kruppa ◽  
K. Doverspike ◽  
S.C. Binari
Keyword(s):  
Low Frequency ◽  
Frequency Dispersion ◽  
Dispersion Characteristics

scholarly journals Brillouin backscattering instability in inhomogeneous collisional plasma

2001 ◽  
Vol 19 (2) ◽  
pp. 223-229 ◽  
Author(s):  
BASSAM SHALABI ◽  
AHMED AL-KHATEEB
Keyword(s):  
Growth Rate ◽  
Convective Instability ◽  
Linear Density ◽  
Amplification Factor ◽  
Collisional Plasma ◽  
Square Root ◽  
Threshold Intensity ◽  
Times Square ◽  
Coupling Equations ◽  
Scale Length

Brillouin backscattering instability is investigated in inhomogeneous collisional plasma. The slow-coupling equations for the instability in a medium with linear density ramp are obtained. For large inhomogeneity scale length, the homogeneous growth rate is found to be modified by a factor of[1/square root(2) times square root(ω02/ (ω02 + νe2) + ω0/square root(ω02 + νe2))]For the convective instability, the amplification factor is found to be[Λ = (|γB0|2/2β)(ω02/ω02 + νe2)]The presence of collisions leads to a reduction in both the growth rate and the amplification factor, where the threshold intensity for the instability to occur increases.

scholarly journals Effect of Radial Wavevector on Collisional Drift Waves in a Toroidal Heliac

1999 ◽  
Vol 52 (1) ◽  
pp. 71 ◽  
Author(s):  
J. L. V. Lewandowski ◽  
R. M. Ellem
Keyword(s):  
Growth Rate ◽  
Electrostatic Potential ◽  
Growth Rates ◽  
Initial Value Problem ◽  
Linear Growth ◽  
Field Model ◽  
Linear Growth Rate ◽  
Drift Waves ◽  
Initial Value ◽  
Magnetic Shear

A 3-field model for collisional drift waves, in the ballooning representation, for a low-pressure stellarator plasma is presented. In particular, the effect of a finite radial mode number (≡ θk) is studied, and the linear growth rates for the fluctuating plasma density, electrostatic potential and electron temperature are computed numerically by solving the 3-field model as an initial-value problem. Numerical results for a 3-field period stellarator with low global magnetic shear are then presented. It is found that, in a system with small global magnetic shear, the case θk = 0 yields the fastest linear growth rate.

scholarly journals Analysis of High-Frequency Dispersion Characteristics of Capacitance and Loss Factor of Aramid Paper Impregnated with Various Dielectric Liquids

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1063 ◽  
Author(s):  
Stefan Wolny
Keyword(s):  
High Frequency ◽  
Loss Factor ◽  
Frequency Dispersion ◽  
Power Transformers ◽  
Multiple Time ◽  
Dispersion Characteristics ◽  
Time Intervals ◽  
Dielectric Liquids ◽  
High Voltage Insulation ◽  
Natural Ester

This paper presents research results of the loss factor of high voltage insulation samples made of aramid paper impregnated with various types of insulating oil. The analysis was carried out in the high frequency domain in the range of 50 Hz to 1 MHz. The experiments were carried out for three impregnation types: mineral oil, synthetic ester and natural ester. The influence of temperature in the range of 20 °C to 100 °C, which is typical when using this type of insulation in power transformers, was taken into account. In addition, the process of influence of initial aging of aramid paper was simulated by heat soaking the samples before their impregnation at a temperature of 250 °C in multiple time intervals. Based on the analyses of dispersion characteristics of insulation sample loss factors, conclusions and recommendations for further diagnostics of aramid-oil insulations using the method described were delineated.

Surface effects on frequency dispersion characteristics of Lamb waves in a nanoplate

2020 ◽  
Vol 697 ◽  
pp. 137831 ◽  
Author(s):  
Wenbo Wu ◽  
Hongbin Zhang ◽  
Fei Jia ◽  
Xin Yang ◽  
Haidong Liu ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Frequency Dispersion ◽  
Surface Effects ◽  
Dispersion Characteristics

Finite amplitude drift waves in a collisional plasma

1977 ◽  
Vol 19 (1) ◽  
pp. 53-61 ◽  
Author(s):  
B N Goswami ◽  
B Buti
Keyword(s):  
Finite Amplitude ◽  
Collisional Plasma ◽  
Drift Waves
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