35 citations · 129 across the 18 of their papers we have counts for
7 papers · 1 filter
Online regularization of Poincaré map of storage rings with Shannon entropy
Yongjun Li, Kelly Anderson, Derong Xu +7
Shannon entropy, as a chaos indicator, is used for online Poincaré map regularization and dynamic aperture optimization in the National Synchrotron Light Source-II (NSLS-II) ring.…
Dedicated beam position monitor pair for model-independent lattice characterization at NSLS-II
Yongjun Li, Kiman Ha, Danny Padrazo +10
This paper reports recent lattice characterization results obtained at the National Synchrotron Light Source II (NSLS-II) storage ring, conducted without reliance on a lattice mode…
Electron beam emittance at operational intensity in fourth-generation synchrotron light sources
Victor Smaluk, Timur Shaftan
For synchrotron light sources, the brightness of user X-ray beams is primarily determined by the electron beam emittance and energy spread at operational intensity. A common featur…
Feasibility study of a hard x-ray FEL oscillator at 3 to 4 GeV based on harmonic lasing and transverse gradient undulator
Li Hua Yu, Victor Smaluk, Timur Shaftan +2
We studied the feasibility of a hard x-ray FEL oscillator (XFELO) based on a 3 to 4 GeV storage ring considered for the low-emittance upgrade of NSLS-II. We present a more detailed…
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…
Convergence map with action-angle variables based on square matrix for nonlinear lattice optimization
Li Hua Yu, Yoshiteru Hidaka, Victor Smaluk
To analyze nonlinear dynamic systems, we developed a new technique based on the square matrix method. We propose this technique called the \convergence map" for generating particle…
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…