A5102966541- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Multilevel Inverters and Converters
- Electric Motor Design and Analysis
- Particle Accelerators and Free-Electron Lasers
- Parallel Computing and Optimization Techniques
- Sensorless Control of Electric Motors
- Magnetic Properties and Applications
- Induction Heating and Inverter Technology
- Magnetic Bearings and Levitation Dynamics
- Electric Power Systems and Control
- Advanced Data Storage Technologies
- Gas Sensing Nanomaterials and Sensors
- Radiation Effects in Electronics
- Embedded Systems and FPGA Design
- Advanced Algorithms and Applications
- Electromagnetic Scattering and Analysis
- Advanced Numerical Analysis Techniques
- Embedded Systems Design Techniques
- Aerosol Filtration and Electrostatic Precipitation
- CCD and CMOS Imaging Sensors
- Microgrid Control and Optimization
- Advanced MEMS and NEMS Technologies
Qingdao University
2022-2024
University of Nottingham Ningbo China
2024
University of California, Los Angeles
2018-2024
Geely (China)
2024
Chengdu University of Information Technology
2024
Xinzhou Teachers University
2009-2010
Along with the establishment of general air-gap field modulation theory, a new type field-modulation machine has attracted increasing attention. However, low power factor always plagued its popularization. This article is to focus on simplest structure surface-mounted permanent-magnet (SMPMFM) machine, aiming at exploring implementation high-power-factor design. The key that calculation formula derived parametrically; hence, originally vague causal relationship between structural parameters...
According to air-gap field-modulation theory, multiple field harmonics are responsible for high torque density of modulation (FM) motors. However, abundant will undoubtedly increase motor losses, especially iron loss and PM eddy-current loss. Therefore, a harmonic-analysis-based minimization (HLM) method incorporated into model predictive control (MPTC) efficiency improvement FM motors is proposed in this article. First, by analyzing the generation mechanism, harmonic-based online...
A novel three-vector-based model predictive flux control (TV-MPFC) with low computation complexity and stator ripple for SPMSM is proposed, in which the vector tracking error evaluated cost function, so weighting factor used torque (MPTC) eliminated, thus avoiding tedious tuning work. To enhance steady-state performance, three voltage vectors including two active one zero are applied period, key improvement of proposed strategy to construct a selection table second optimal based on decreases...
In plasma wakefield acceleration, the witness beam's emittance needs to be preserved when it propagates through a stage. The includes density ramps at both entrance and exit. Using Wentzel-Kramers-Brillouin solution of single particle's motion, analytical expressions for evolution beam Twiss parameters in an arbitrary adiabatic profile are provided neglecting acceleration inside plasma. It is shown that can under matching condition even has initial energy spread. also growth unmatched...
Plasma-based acceleration has emerged as a promising candidate an accelerator technology for future linear collider or next-generation light source. For collider, the energy transfer efficiency from drive beam to wake and trailing must be large, while emittance spread of bunch preserved. One way simultaneously achieve this when accelerating electrons is use longitudinally shaped bunches nonlinear wakes. In regime, there analytical formalism obtain optimal shapes. however, shape driver...
Plasma based acceleration (PBA) is being considered for a next generation linear collider (LC). In typical PBA-LC designs, the extreme beam parameters are expected to trigger background ion motion, which can lead longitudinally varying nonlinear focusing forces and result in emittance growth of beam. While various schemes have been proposed mitigate this at low energies, solution minimize later high energy stages multistage electron arm yet be found. paper, we propose use an adiabatic plasma...
Based on the magnetic gear effect, field-modulated permanent-magnet machine (FMPMM) can realize unequal pole design of rotor PM field and stator armature field. With advantages high torque density efficiency, FMPMM has been widely studied in low-speed direct-drive applications. As a kind excited by PMs, performance was affected demagnetization state. However, method for establishing model based finite element analysis (FEA) presented some problems, including tedious repeated modeling work...
Plasma-based acceleration (PBA) has emerged as a promising candidate for the accelerator technology used to build future linear collider and/or an advanced light source. In PBA, trailing or witness particle beam is accelerated in plasma wave wakefield (WF) created by laser driver. The distance over which drive evolves several orders of magnitude larger than wake wavelength. This large disparity length scales amenable quasi-static approach. Three-dimensional (3D), (QS), particle-in-cell (PIC)...
Plasma-based acceleration (PBA) has emerged as a promising candidate for the accelerator technology used to build future linear collider and/or an advanced light source. In PBA, trailing or witness particle beam is accelerated in plasma wave wakefield (WF) created by laser driver. The WF often nonlinear and involves crossing of trajectories real space thus particle-in-cell methods are used. distance over which drive evolves several orders magnitude larger than wake wavelength. This large...
Plasma-based acceleration (PBA) is being considered for a next generation linear collider (LC). In some PBA-LC designs the electron arm, extreme beam parameters are expected to trigger background ion motion within witness beam, which can lead longitudinally varying nonlinear focusing forces and result in an unacceptable emittance growth of beam. To mitigate this, we propose use quasi-adiabatic plasma density ramps as matching sections at entrance exit each stage. We match low entrance, where...
Hollow plasma has been introduced into the proton-driven wakefield accelerators to overcome issue of beam quality degradation caused by nonlinear transverse wakefields varying in radius and time uniform plasma. It demonstrated simulations that electrons can be accelerated energy frontier with well-preserved a long hollow channel. However, this scheme imposes tight requirements on beam-channel alignment. Otherwise asymmetric along axis are induced, which could distort driving bunch...
We present three methods for mitigating the hosing of witness beam in plasma wakefield acceleration (PWFA) experiments. will look at a specific case with parameters similar to what be used FACET-II (Facility Advanced Accelerator Experimental Tests). First, we examine adding an energy chirp and how loading affects growth spread. Next, asymmetric (elliptical) drive can suppress by making focusing force vary along propagation direction. Finally, regime where ion collapse from suppresses beam.
In this paper, a six-phase field-modulated permanent magnet (S-FMPM) motor with fault tolerance is studied. When the one-phase open-circuit occurs, fault-tolerant control strategy constant magnetomotive force under both healthy and faulty conditions carried out. Taking minimum stator copper loss neutral point current being 0 as constraint condition, Lagrange multiplier method used to solve of phase. Finally, effectiveness in verified by simulation experiment.
This paper presents a novel model for capturing the dynamic behavior of flux-concentrating field-modulated permanent magnet (FCFMPM) motor under control. is developed by coupling control-circuit unit with electromagnetic-field calculation FCFMPM motor. The latter incorporates finite difference method into 2-D subdomain technique to deal saturation issue iron core. Compared conventional modeling approaches, proposed one possesses high accuracy and efficiency due combining analytical numerical...