# Ying Wu

### **Professor of Physics**

### Overview

Prof. Wu is interested in nonlinear dynamics of charged particle beams, coherent radiation sources, and the development of novel accelerators and light sources. One of his research focuses is to study the charged particle nonlinear dynamics using the modern techniques such as Lie Algebra, Differential Algebra, and Frequency Analysis. This direction of research will significantly further the understanding of the nonlinear phenomena in light source storage rings and collider rings, improve their performance, and provide guidance for developing next generation storage rings. The second area of research is to study and develop coherent radiation sources such as broad-band far infrared radiation from dipole magnets and coherent mm-wave radiation from a free-electron-laser (FEL). With this direction of research, he hopes to study the beam stability issues, in particular, the single bunch instabilities in the storage ring, develop diagnostics to monitor and improve the stability of the light source beams, and eventually develop novel means to overcome instabilities. These areas of research will provide foundations for developing a femto-second hard x-ray Compton back scattering radiation source driven by a mm-wave FEL - a next generation light source.

Wu, Y., et al. “Mini-beta lattice for the femto-second X-ray source at the Advanced Light Source.” *Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment*, vol. 481, no. 1–3, Apr. 2002, pp. 675–81. *Scopus*, doi:10.1016/S0168-9002(01)01353-5.
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Feng, J., et al. “Modeling the acceleration field and objective lens for an aberration corrected photoemission electron microscope.” *Review of Scientific Instruments*, vol. 73, no. 3 II, Mar. 2002, p. 1514. *Scopus*, doi:10.1063/1.1423631.
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Steier, C., et al. “Design of a fast global orbit feedback system for the Advanced Light Source.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 2, Dec. 2001, pp. 1252–54.

Steier, C., et al. “Intra-beam scattering and minimum achievable emittance in the advanced light source.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2001, pp. 2938–40.

Wu, Y., et al. “Symplectic models for general insertion devices.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 1, Dec. 2001, pp. 459–61.

Litvinenko, V. N., et al. “Project for generation of femtosecond X-ray beams from the Duke storage ring.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2001, pp. 2614–16.

Barry, W., et al. “A dedicated infrared synchrotron radiation source at the ALS.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2001, pp. 2623–25.

Mikhailov, S. F., et al. “Low emittance lattices for the Duke FEL Storage Ring.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 5, Dec. 2001, pp. 3528–30.

Hartman, S., et al. “Control system design and upgrade considerations for the Duke Free Electron Laser Laboratory.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 2, Dec. 2001, pp. 785–87.

Wolski, A., and Y. Wu. “Effects of damping wigglers on beam dynamics in the NLC damping rings.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 5, Dec. 2001, pp. 3798–800.