Nonlinear effects arising when high-power vlf waves act on the magnetospheric-ionospheric plasma. A survey

1977 ◽  
Vol 20 (12) ◽  
pp. 1211-1217
Author(s):  
O. A. Molchanov
Keyword(s):  
High Power ◽  
Ionospheric Plasma ◽  
Nonlinear Effects ◽  
Vlf Waves

scholarly journals Amplification characteristics in active tapered segmented cladding fiber with large mode area

2021 ◽  
Vol 9 ◽  
Author(s):  
Caijian Xie ◽  
Tigang Ning ◽  
Jingjing Zheng ◽  
Li Pei ◽  
Jianshuai Wang ◽  
...  
Keyword(s):  
High Power ◽  
Heat Load ◽  
Nonlinear Effects ◽  
Single Mode ◽  
Large Mode Area ◽  
High Loss ◽  
Effective Mode Area ◽  
Steady State Rate ◽  
State Rate ◽  
Mode Area

Abstract A kind of tapered segmented cladding fiber (T-SCF) with large mode area (LMA) is proposed, and the mode and amplification characteristics of T-SCFs with concave, linear, and convex tapered structures are investigated based on finite-element method (FEM) and few-mode steady-state rate equation. Simulation results indicate that the concave tapered structure can introduce high loss for high-order modes (HOMs) that is advantageous to achieve single-mode operation, whereas the convex tapered structure provides large effective mode area that can help to mitigate nonlinear effects. Meanwhile, the small-to-large amplification scheme shows further advantages on stripping off HOMs, and the large-to-small amplification scheme decreases the heat load density induced by the high-power pump. Moreover, single-mode propagation performance, effective mode area, and heat load density of the T-SCF are superior to those of tapered step index fiber (T-SIF). These theoretical model and numerical results can provide instructive suggestions for designing high-power fiber lasers and amplifiers.

scholarly journals Nonlinear processes in the bunched electron beams of high-power klystrons and the limits of analytical and one-dimensional numerical models applicability for their analysis.

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
V.Y. Rodyakin ◽  
◽  
V.M. Pikunov ◽  
V.N. Aksenov ◽  
◽  
...  
Keyword(s):  
Electron Beam ◽  
High Power ◽  
Numerical Models ◽  
Nonlinear Effects ◽  
Analytical Models ◽  
Modulation Amplitude ◽  
Two Dimensional ◽  
One Dimensional ◽  
Charge Parameter ◽  
Program Data

We present the results of a comparative theoretical analysis of the electron beam bunching in a single-stage klystron amplifier using analytical models, a one-dimensional disk program, and a two-dimensional program. Data on the influence of various one-dimensional and two-dimensional nonlinear effects on the efficiency of electron beam bunching at different values of the space charge parameter and the modulation amplitude are presented. The limits of applicability of analytical and one-dimensional numerical models for electron beam bunching analysis in high-power klystron amplifiers are found.

Study on high power microwave nonlinear effects and degradation characteristics of C-band low noise amplifier

2022 ◽  
Vol 128 ◽  
pp. 114427
Author(s):  
Li Fuxing ◽  
Chai Changchun ◽  
Wu Han ◽  
Wang Lei ◽  
Liang Qishuai ◽  
...  
Keyword(s):  
High Power ◽  
Nonlinear Effects ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
High Power Microwave ◽  
Noise Amplifier ◽  
Power Microwave

Power limitation induced by nonlinear effects in pulsed high-power fiber amplifiers

2006 ◽  
Vol 7 (2) ◽  
pp. 163-169 ◽  
Author(s):  
Yves Jaouën ◽  
Guillaume Canat ◽  
Sébastien Grot ◽  
Sylvain Bordais
Keyword(s):  
High Power ◽  
Nonlinear Effects ◽  
Fiber Amplifiers

Nonlinear effects in high-power applications of metamaterials

2013 ◽  
Author(s):  
Hamide S. Faraji ◽  
Georgios Atmatzakis ◽  
Mehmet F. Su ◽  
Christos G. Christodoulou
Keyword(s):  
High Power ◽  
Nonlinear Effects
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