13 citations · 50 across the 10 of their papers we have counts for
11 papers
Nonlinear optics from hybrid dispersive orbits
Yongjun Li, Derong Xu, Victor Smaluk +1
In this paper we present an expansion of the technique of characterizing nonlinear optics from off-energy orbits (NOECO) to cover harmonic sextupoles in storage rings. The existing…
Designing linear lattices for round beam in electron storage rings using the solution by linear matrices analysis
Yongjun Li, Robert Rainer
For some synchrotron light source beamline applications, a round beam is preferable to a flat one. A conventional method of obtaining round beam in an electron storage ring is to s…
Data-driven Chaos Indicator for Nonlinear Dynamics and Applications on Storage Ring Lattice Design
Yongjun Li, Jinyu Wan, Allen Liu +2
A data-driven chaos indicator concept is introduced to characterize the degree of chaos for nonlinear dynamical systems. The indicator is represented by the prediction accuracy of…
Design of double- and multi-bend achromat lattices with large dynamic aperture and approximate invariants
Yongjun Li, Kilean Hwang, Chad Mitchell +3
A numerical method to design nonlinear double- and multi-bend achromat (DBA and MBA) lattices with approximate invariants of motion is investigated. The search for such nonlinear l…
Fast dynamic aperture optimization with reversal integration
Yongjun Li, Yue Hao, Kilean Hwang +3
A fast method for dynamic aperture (DA) optimization of storage rings has been developed through the use of reversal integration. While chaotic dynamical systems have exact time-re…
Bayesian Approach for Linear Optics Correction
Yongjun Li, Robert Rainer, Weixing Cheng
With a Bayesian approach, the linear optics correction algorithm for storage rings is revisited. Starting from the Bayes' theorem, a complete linear optics model is simplified as "…
Analysis of beam position monitor requirements with Bayesian Gaussian regression
Yongjun Li, Yue Hao, Weixing Cheng +1
With a Bayesian Gaussian regression approach, a systematic method for analyzing a storage ring's beam position monitor (BPM) system requirements has been developed. The ultimate pe…
Reconstruction of Storage Ring 's Linear Optics with Bayesian Inference
Yue Hao, Yongjun Li, Michael Balcewicz +2
A novel approach of accurately reconstructing storage ring's linear optics from turn-by-turn (TbT) data containing measurement error is introduced. This approach adopts a Bayesian…
Characterization and control of linear coupling using turn-by-turn beam position monitor data in storage rings
Yongjun Li, Lingyun Yang, Weixing Cheng
We introduce a new application of measuring symplectic generators to characterize and control the linear betatron coupling in storage rings. From synchronized and consecutive BPM (…
Optimize Nonlinear Beam Dynamical System with Square Matrix Method
Yongjun Li, Li Hua Yu, Lingyun Yang
Nonlinear dynamics has an important role when designing modern synchrotron lattices. In this letter, we introduce a new method of using a square matrix to analyze periodic nonlinea…
A practical approach to extract symplectic transfer maps numerically for arbitrary magnetic elements
Yongjun Li, Xiaobiao Huang
We introduce a practical approach to extract the symplectic transfer maps for arbitrary magnetic beam-line elements. Beam motion in particle accelerators depends on linear and nonl…