Waveguide mode amplitude estimation using warping and phase compensation

2017 ◽  
Vol 141 (3) ◽  
pp. 2243-2255 ◽  
Author(s):  
Julien Bonnel ◽  
Salvatore Caporale ◽  
Aaron Thode
Keyword(s):  
Waveguide Mode ◽  
Phase Compensation ◽  
Mode Amplitude ◽  
Amplitude Estimation

Vortex Fiber Mode Amplitude Estimation

2012 ◽  
Author(s):  
Steven E. Golowich ◽  
Nenad Bozinovic ◽  
Poul Kristensen ◽  
Siddharth Ramachandran
Keyword(s):  
Mode Amplitude ◽  
Amplitude Estimation ◽  
Fiber Mode

scholarly journals Stable Radio Frequency Transmission of Single Optical Source Over Fiber Based on Passive Phase Compensation

2021 ◽  
Vol 13 (1) ◽  
pp. 1-7
Author(s):  
Chen Hu ◽  
Bin Luo ◽  
Wenlin Bai ◽  
Wei Pan ◽  
Lianshan Yan ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Phase Compensation ◽  
Optical Source ◽  
Passive Phase

scholarly journals Monolayer molecular sensing using infrared leaky waveguide mode

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035305
Author(s):  
Tieyan Zhang ◽  
De He ◽  
Lu Liu ◽  
Qiqige Wulan ◽  
Jiachen Yu ◽  
...  
Keyword(s):  
Waveguide Mode ◽  
Molecular Sensing ◽  
Leaky Waveguide

Current harmonic suppression for permanent magnet synchronous motor based on phase compensation resonant controller

2020 ◽  
pp. 107754632098246
Author(s):  
Peiling Cui ◽  
Fanjun Zheng ◽  
Xinxiu Zhou ◽  
Wensi Li
Keyword(s):  
Permanent Magnet ◽  
Control Method ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Current Loop ◽  
Phase Lag ◽  
Phase Compensation ◽  
Current Harmonic ◽  
Resonant Controller ◽  
Harmonic Components

Permanent magnet synchronous motor always suffers from air gap field distortion and inverter nonlinearity, which lead to the harmonic components in motor currents. A resonant controller is a remarkable control method to eliminate periodic disturbance, whereas the conventional resonant controller is limited by narrow bandwidth and phase lag. This article presents a novel resonant controller with a precise phase compensation method for a permanent magnet synchronous motor to suppress the current harmonics. Based on the analysis of the current harmonic characteristics, the proposed resonant controller for rejecting a set of selected current harmonic components is plugged in the current loop, and it is parallel to the traditional proportional–integral controller. Furthermore, the stability analysis of the proposed resonant controller is investigated, and the parameters are tuned to get a satisfactory performance. Compared with the conventional resonant controller, the proposed resonant controller can achieve good steady-state performance, dynamic performance, and frequency adaptivity performance, simultaneously. Finally, the experimental results demonstrate the effectiveness of the proposed suppression scheme.

scholarly journals Drift kinetic theory of alpha transport by tokamak perturbations

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Elizabeth A. Tolman ◽  
Peter J. Catto
Keyword(s):  
Heat Flux ◽  
Kinetic Theory ◽  
Alpha Particle ◽  
Heat Fluxes ◽  
Alpha Particles ◽  
Alpha Power ◽  
Mode Amplitude ◽  
Effective Collision Frequency ◽  
Perturbation Frequency ◽  
Particle Confinement

Upcoming tokamak experiments fuelled with deuterium and tritium are expected to have large alpha particle populations. Such experiments motivate new attention to the theory of alpha particle confinement and transport. A key topic is the interaction of alpha particles with perturbations to the tokamak fields, including those from ripple and magnetohydrodynamic modes like Alfvén eigenmodes. These perturbations can transport alphas, leading to changed localization of alpha heating, loss of alpha power and damage to device walls. Alpha interaction with these perturbations is often studied with single-particle theory. In contrast, we derive a drift kinetic theory to calculate the alpha heat flux resulting from arbitrary perturbation frequency and periodicity (provided these can be studied drift kinetically). Novel features of the theory include the retention of a large effective collision frequency resulting from the resonant alpha collisional boundary layer, correlated interactions over many poloidal transits and finite orbit effects. Heat fluxes are considered for the example cases of ripple and the toroidal Alfvén eigenmode (TAE). The ripple heat flux is small. The TAE heat flux is significant and scales with the square of the perturbation amplitude, allowing the derivation of constraints on mode amplitude for avoidance of significant alpha depletion. A simple saturation condition suggests that TAEs in one upcoming experiment will not cause significant alpha transport via the mechanisms in this theory. However, saturation above the level suggested by the simple condition, but within numerical and experimental experience, which could be accompanied by the onset of stochasticity, could cause significant transport.

Broadband Doherty Power Amplifier Based on Coupled Phase Compensation Network

2021 ◽  
pp. 1-1
Author(s):  
Xin Yu Zhou ◽  
Wing Shing Chan ◽  
Wenjie Feng ◽  
Xiaohu Fang ◽  
Tushar Sharma ◽  
...  
Keyword(s):  
Power Amplifier ◽  
Phase Compensation ◽  
Doherty Power Amplifier
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