scholarly journals Mode conversion efficiency to Laguerre-Gaussian OAM modes using spiral phase optics

2017 ◽  
Vol 25 (15) ◽  
pp. 17382 ◽  
Author(s):  
Andrew Longman ◽  
Robert Fedosejevs
Keyword(s):  
Conversion Efficiency ◽  
Mode Conversion ◽  
Spiral Phase

Periodic printed semi-annular substrate loaded TM01–TE11 mode converter

2020 ◽  
pp. 1-7
Author(s):  
Ashish Chittora ◽  
Swati Varun Yadav
Keyword(s):  
Conversion Efficiency ◽  
Mode Conversion ◽  
Circular Waveguide ◽  
Mode Converter ◽  
Space Applications ◽  
High Power Microwave ◽  
Relative Bandwidth ◽  
Measurement Results ◽  
Power Handling Capability ◽  
Lightweight Structure

Abstract A mode converter design using the concept of periodic substrates loading in a circular waveguide, to convert TM01 mode to TE11 mode is presented in this paper. The detailed design principle, simulation, and measurement results are included in this study. Simulation results show that the purity of output fundamental TE11 mode of the converter approaches 99.2% for an operating frequency of 3.2 GHz. The mode conversion efficiency is more than 90% over 3.07–3.25 GHz band and the relative bandwidth is 5.6% (180 MHz). The proposed TM01–TE11 mode converter has advantages, such as the compact, lightweight structure, high conversion efficiency, and proper bandwidth. The fabrication cost is relatively low and the structure is easy to fabricate. The power-handling capability is limited to 10 MW due to dielectric-based design. The compactness and portability of the system (e.g. Space applications, Accelerators, High Power Microwave) can be improved significantly using the proposed mode converter.

Enhancing The Mode Conversion Efficiency In JET Plasmas With Multiple Mode Conversion Layers

2011 ◽  
Author(s):  
D. Van Eester ◽  
E. Lerche ◽  
T. Johnson ◽  
T. Hellsten ◽  
J. Ongena ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Mode Conversion ◽  
Multiple Mode

scholarly journals Theoretical analysis and numerical calculation of mode conversion efficiency of fast wave

2013 ◽  
Vol 62 (7) ◽  
pp. 075204
Author(s):  
Lu Ling ◽  
Zhang Xin-Jun ◽  
Zhao Yan-Ping ◽  
Qin Cheng-Ming
Keyword(s):  
Numerical Calculation ◽  
Theoretical Analysis ◽  
Conversion Efficiency ◽  
Mode Conversion ◽  
Fast Wave

Enhanced ICRF (ion cyclotron range of frequencies) mode conversion efficiency in plasmas with two mode conversion layers

2010 ◽  
Vol 52 (11) ◽  
pp. 115006 ◽  
Author(s):  
Ye O Kazakov ◽  
I V Pavlenko ◽  
D Van Eester ◽  
B Weyssow ◽  
I O Girka
Keyword(s):  
Conversion Efficiency ◽  
Mode Conversion ◽  
Ion Cyclotron

scholarly journals 3D Full-Wave modelling and EC mode conversion in realistic plasmas

2019 ◽  
Vol 203 ◽  
pp. 01003
Author(s):  
Pavel Aleynikov ◽  
Nikolai B. Marushchenko
Keyword(s):  
Conversion Efficiency ◽  
Graphics Processing Units ◽  
Cold Plasma ◽  
Mode Conversion ◽  
Parallel Computations ◽  
Wave Modelling ◽  
Full Wave ◽  
Graphics Processing ◽  
Antenna Location

The wave physics of O-X conversion in overdense W7-X plasma is discussed. For this study, a new 3D, cold plasma full-wave code has been developed. The code takes advantage of massive parallel computations with Graphics Processing Units (GPU), which allows for up to 100 times faster calculations than on a single-CPU. A 3D calculation of the O-X conversion is demonstrated. We discuss limitations of the mode conversion scenario within the capabilities of the existing ECRH system in W7-X, and demonstrate an optimised conversion scenario in which the launching antenna location is altered. The conversion efficiency of the optimised scenario is predicted to be >85%.

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