A5041801417- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- Advanced Optical Network Technologies
- Satellite Communication Systems
- Advanced Fiber Laser Technologies
- Efficiency Analysis Using DEA
- Distributed and Parallel Computing Systems
- Optical Systems and Laser Technology
- Advancements in Photolithography Techniques
- Advanced Data Storage Technologies
- Optical Wireless Communication Technologies
- Terahertz technology and applications
- Magnetic confinement fusion research
- Electromagnetic Simulation and Numerical Methods
- Advanced Algorithms and Applications
- Advanced Fiber Optic Sensors
- Power Systems and Technologies
- Photocathodes and Microchannel Plates
Brookhaven National Laboratory
2015-2024
European Synchrotron Radiation Facility
2024
Tsinghua University
2024
Air Force Engineering University
2007-2024
Argonne National Laboratory
2024
Guangdong Provincial People's Hospital
2021-2023
Aston University
2023
Brookhaven College
2019-2023
Xi'an University of Technology
2023
University of Science and Technology of China
2000-2022
With the aid of machine learning techniques, genetic algorithm has been enhanced and applied to multi-objective optimization problem presented by dynamic aperture National Synchrotron Light Source II (NSLS-II) Storage Ring. During evolution processes employed algorithm, population is classified into different clusters in search space. The with top average fitness are given ``elite'' status. Intervention on implemented repopulating some potentially competitive candidates based experience...
Dynamic aperture (DA) is one of the key nonlinear properties for a storage ring. Although there have been both analytical and numerical methods to find aperture, reverse problem how optimize it still challenging problem. A general flexible way optimizing DA highly demanded in accelerator design operation. In this paper, we discuss use multiobjective optimization DA. First consider using objective functions based only on tracking results. Data mining these results demonstrated correlation...
A measurable chaos indicator is used as the online optimization objective in tuning a complicated nonlinear system—the National Synchrotron Light Source-II storage ring. Through analyzing Shannon entropy measured Poincaré maps, not only can commonly characterizations be extracted, but more importantly, quantified and then for an regularization of these maps. The method itself general applicable to other tunable systems well. Published by American Physical Society 2025
Ant colony optimization (ACO) with the small window strategy is put forward to solve routing and wavelength assignment problem in satellite optical networks. The intersatellite distance, link duration, idle ratio are introduced as heuristic functions, used promote convergence speed. By calculating intersection of wavelengths on adjacent links, algorithm can accomplish selection a single ant. results show that, compared Dijkstra+FF algorithm, blocking probability ACO decrease by 50% at most,...
Mycobacterium avium subsp hominissuis (previously avium) is an environmental organism associated with opportunistic infections in humans. infects and replicates within mononuclear phagocytes. Previous study characterized attenuated mutant which the PPE gene (MAV_2928) homologous to Rv1787 was inactivated. This mutant, contrast wild-type bacterium, shown both have impaired ability replicate macrophages prevented phagosome/lysosome fusion.MAV_2928 primarily upregulated upon phagocytosis. The...
<h3>Aims:</h3> To evaluate the relationship between angle width as determined by anterior segment optical coherence tomography (AS-OCT) and presence of peripheral synechiae (PAS). <h3>Methods:</h3> This was a prospective observational case series in which 203 subjects with primary closure or open angles were recruited. Images nasal, temporal inferior obtained AS-OCT dark conditions. Subjects then underwent gonioscopy an independent examiner who masked to findings. PAS identified defined...
In this paper, we explore a method to manipulate low energy electron bunches in space charge dominated regime, and use design linac bunch compressors compress regime. the method, effects instead of avoiding them; i.e., forces generate required chirp ordinary which uses rf accelerating system chirp. We redefine concepts dispersion function beta functions regime guide optimization. Using study (5--22 MeV) compressor produce short ($\ensuremath{\sim}150\text{ }\mathrm{fs}$) small size...
An exact analytical expression of the signal-to-noise ratio (SNR) for an intersatellite microwave photonics link with optical preamplifier is derived considering signal fade caused by pointing errors transceiver, and optimized model laser output power direct current (DC) bias phase shift Mach-Zehnder modulator established. It shown that, given desired SNR root mean square (rms) random jitter, optimal DC exists that minimizes power. The effects parameters on minimum are also examined....
With a Bayesian Gaussian regression approach, systematic method for analyzing storage ring's beam position monitor (BPM) system requirements has been developed. The ultimate performance of ring-based accelerator, based on brightness or luminosity, is determined not only by global parameters, but also local properties at some particular points interest (POI). BPMs used monitoring the properties, however, can be located these points. Therefore, underlying and fundamental purpose BPM to predict...
We report an efficient dynamic aperture (DA) optimization approach using multi-objective genetic algorithm (MOGA), which is driven by nonlinear driving terms computation. It was found that having small low order a necessary but insufficient condition of decent DA. Then direct DA tracking simulation implemented among the last generation candidates to select best solutions. The demonstrated successfully in optimizing NSLS-II storage ring
In this paper, we applied an approximate entropy (ApEn) analysis to nonlinear beam dynamics. Due the presence of strong magnets, degree chaos in motion gradually increases proportionally with its amplitude. Such can be quantitatively characterized ApEn turn-by-turn readings. is a technique used quantify amount regularity and unpredictability fluctuations respect time-series data. The ApEn, when as indicator, then for lattice optimization analysis. National Synchrotron Light Source II...
In this work, we propose a high-efficiency terahertz (THz) wave-generation approach by cascaded difference frequency generation (CDFG) with an aperiodically poled lithium niobate (APPLN) crystal at cryogenic temperature. The APPLN desirable poling periods along the length determines phase mismatches of each-order CDFG, resulting in decrement Stokes processes and increment anti-Stokes simultaneously. This is contrast previous works on where THz wave was generated irreversible processes....
With a Bayesian approach, the linear optics correction algorithm for storage rings is revisited. Starting from Bayes' theorem, complete model simplified as "likelihood functions" and "prior probability distributions". Under some assumptions, least square then Jacobian matrix approach can be re-derived. The coherence of ensured through specifying self-consistent regularization coefficient to prevent overfitting. Optimal weights different objectives are obtained based on their measurement...
A novel approach of accurately reconstructing storage ring's linear optics from turn-by-turn (TbT) data containing measurement error is introduced. This adopts a Bayesian inference based on the Markov Chain Monte-Carlo (MCMC) algorithm, which widely used in data-driven discoveries. By assuming preset accelerator model with unknown parameters, process yields their posterior distribution. demonstrated by inferring Twiss parameters and uncertainties using set measured at National Synchrotron...
An optical preamplifier is utilized to improve the signal-to-noise and distortion ratio (SNDR) of intersatellite microwave photonic links employing a Mach-Zehnder modulator under dual-tone modulation. The resulting SNDR at an appropriate direct current (DC) bias phase shift additionally investigated without small-signal approximation in order optimize performance all links. It observed that most limiting factor degrading changed, fundamental power seen increase more compared with third-order...