# 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. K., et al. “BPM and orbit correction systems at the Duke storage ring.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2003, pp. 2479–81.

Wan, W., et al. “ID modeling at the ALS.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2003, pp. 2249–51.

Li, J., et al. “Power supply performance monitoring and analysis using operation data.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2003, pp. 2270–72.

Wu, Y. K., et al. “A physics based control system for the Duke storage ring.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2003, pp. 2482–84.

Wu, Y. K., et al. “Nonlinear dynamics in the Duke storage ring with FEL wigglers.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 1, Dec. 2003, pp. 391–93.

Wu, Y. K., et al. “Improving power supply performance for the Duke storage ring.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 2, Dec. 2003, pp. 752–54.

Mikhailov, S., et al. “Status of the booster synchrotron for Duke FEL storage ring.” *Proceedings of the Ieee Particle Accelerator Conference*, vol. 4, Dec. 2003, pp. 2273–75.

Wu, Y. K., et al. “Explicit symplectic integrator for s-dependent static magnetic field.” *Physical Review E Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics*, vol. 68, no. 4, Jan. 2003. *Scopus*, doi:10.1103/PhysRevE.68.046502.
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Steier, C., et al. “Measuring and optimizing the momentum aperture in a particle accelerator.” *Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics*, vol. 65, no. 5 Pt 2, May 2002, p. 056506. *Epmc*, doi:10.1103/physreve.65.056506.
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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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