**Office Location:** 210 FEL Bldg, FEL Laboratory, LaSalle Street Extension, Durham, NC 27708-0319**Office Phone:** +1 919 660 2654**Email Address:** ying.wu@duke.edu

**Specialties:**

Beam physics

Nonlinear dynamics and complex systems

**Education:**

Ph.D., Duke University, 1995

M.A., Duke University, 1991

B.S., Beijing University (China), 1988

**Research Categories:** *Accelerator Physics and Novel Light Source Development*

**Research Description:** 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.

**Recent Publications**
(More Publications)

- Liu, P; Yan, J; Afanasev, A; Benson, SV; Hao, H; Mikhailov, SF; Popov, VG; Wu, YK,
*Generation of superposed orbital angular momentum beams using a free-electron laser oscillator.*, Optics express, vol. 32 no. 2 (January, 2024), pp. 2235-2244, Optica Publishing Group [doi] [abs]. - Peifan Liu, Jun Yan, Andrei A. Fanasev, Stephen V. Benson, Hao Hao, Stepha F. Mikhailov, Victor G. Popov, Ying K. Wu,
*Generation of superposed orbital angular momentum beams using a free-electron laser oscillator*, Optics Express (Accepted, December, 2023) [author's comments]. - Kochanneck, L; Ehlers, H; Mikhailov, S; Yan, J; Popov, V; Wallace, P; Swift, G; Ahmed, M; Wu, YK; Jensen, LO; Ristau, D,
*Enabling Storage Ring FEL for lasing below 170 nm and production of 120 MeV circularly polarized γ-ray by VUV mirrors*, 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023 (January, 2023) [doi] [abs]. - Li, W; Yan, J; Liu, P; Wu, YK,
*Synchrotron radiation interferometry for beam size measurement at low current and in large dynamic range*, Physical Review Accelerators and Beams, vol. 25 no. 8 (August, 2022), American Physical Society (APS) [doi] [abs]. - Li, X; Ahmed, MW; Banu, A; Bartram, C; Crowe, B; Downie, EJ; Emamian, M; Feldman, G; Gao, H; Godagama, D; Grießhammer, HW; Howell, CR; Karwowski, HJ; Kendellen, DP; Kovash, MA; Leung, KKH; Markoff, DM; McGovern, JA; Mikhailov, S; Pywell, RE; Sikora, MH; Silano, JA; Sosa, RS; Spraker, MC; Swift, G; Wallace, P; Weller, HR; Whisnant, CS; Wu, YK; Zhao, ZW,
*Proton Compton Scattering from Linearly Polarized Gamma Rays.*, Physical review letters, vol. 128 no. 13 (April, 2022), pp. 132502 [doi] [abs].

**Highlight:**

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.

**Current Ph.D. Students**(Former Students)- Peifan Liu

**Postdocs Mentored**- Wei Li (August, 2020 - present)
- Jun Yan (September, 2016 - August, 2019)
- Wenzhong Wu (October, 2012 - April, 2014)
- Hao Hao (October, 2011 - October, 2014)
- Jingyi Li (2002/07-2005/07)