Investigation on current loss of high-power vacuum transmission lines with coaxial-disk transitions by particle-in-cell simulations

2021 ◽  
Author(s):  
Wei Luo ◽  
Jianwei Zhang ◽  
Yongdong Li ◽  
Hongguang Wang ◽  
Chunliang Liu ◽  
...  
Keyword(s):  
Transmission Lines ◽  
High Power ◽  
Current Loss ◽  
Particle In Cell ◽  
Coaxial Disk

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

High-power InAlAs/InGaAs Schottky barrier photodiodes for analog microwave signal transmission

2022 ◽  
Vol 43 (1) ◽  
pp. 012302
Author(s):  
K. S. Zhuravlev ◽  
A. L. Chizh ◽  
K. B. Mikitchuk ◽  
A. M. Gilinsky ◽  
I. B. Chistokhin ◽  
...  
Keyword(s):  
Schottky Barrier ◽  
Transmission Lines ◽  
High Power ◽  
High Speed ◽  
Signal Transmission ◽  
Mesa Structure ◽  
Microwave Characterization ◽  
Absorbing Layer ◽  
Analog Transmission

Abstract The design, manufacturing and DC and microwave characterization of high-power Schottky barrier InAlAs/InGaAs back-illuminated mesa structure photodiodes are presented. The photodiodes with 10 and 15 μm mesa diameters operate at ≥40 and 28 GHz, respectively, have the output RF power as high as 58 mW at a frequency of 20 GHz, the DC responsivity of up to 1.08 A/W depending on the absorbing layer thickness, and a photodiode dark current as low as 0.04 nA. We show that these photodiodes provide an advantage in the amplitude-to-phase conversion factor which makes them suitable for use in high-speed analog transmission lines with stringent requirements for phase noise.

Comparison of High Power Microwave Source Performance Between Different Particle-In-Cell Codes at the Naval Research Laboratory

2018 ◽  
Author(s):  
Ian M. Rittersdorf ◽  
A. Stephen Richardson ◽  
Stephen B. Swanekamp ◽  
Joseph W. Schumer ◽  
Peter Stoltz ◽  
...  
Keyword(s):  
High Power ◽  
Research Laboratory ◽  
Naval Research Laboratory ◽  
Naval Research ◽  
Microwave Source ◽  
High Power Microwave ◽  
Particle In Cell ◽  
Power Microwave

P3-3: Measurement of loss in high power 170 GHz gyrotron transmission lines

2010 ◽  
Author(s):  
Elizabeth J. Kowalski ◽  
Emilio A. Nanni ◽  
Michael A. Shapiro ◽  
Jagadishwar R. Sirigiri ◽  
Richard J. Temkin ◽  
...  
Keyword(s):  
Transmission Lines ◽  
High Power
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