Zobrazeno 1 - 10
of 563
pro vyhledávání: '"R. K. Li"'
Autor:
Y. N. Yang, A. Fisher, P. Musumeci, R. K. Li, M. Kravchenko, R. Agustsson, Y. Chen, A. Murokh
Publikováno v:
Physical Review Accelerators and Beams, Vol 27, Iss 10, p 100701 (2024)
Using a waveguide in a THz FEL has been shown to maximize the coupling and enable efficient extraction of relativistic electron beam energy from a single passage through a tapered helical undulator. An oscillator configuration can further boost energ
Externí odkaz:
https://doaj.org/article/30fa9725c6644d9faa8d0554fcce4e3a
Publikováno v:
Structural Dynamics, Vol 11, Iss 2, Pp 024302-024302-11 (2024)
Ultrafast electron diffraction (UED) stands as a powerful technique for real-time observation of structural dynamics at the atomic level. In recent years, the use of MeV electrons from radio frequency guns has been widely adopted to take advantage of
Externí odkaz:
https://doaj.org/article/d1fa517167ac424cb60bf98291cf58c6
Autor:
X. J. Deng, Y. Zhang, Z. L. Pan, Z. Z. Li, J. H. Bian, C.-Y. Tsai, R. K. Li, A. W. Chao, W. H. Huang, C. X. Tang
Publikováno v:
Journal of Synchrotron Radiation, Vol 30, Iss 1, Pp 35-50 (2023)
A promising accelerator light source mechanism called steady-state microbunching (SSMB) is being actively studied. With the combination of strong coherent radiation from microbunching and high repetition rate of a storage ring, high-average-power nar
Externí odkaz:
https://doaj.org/article/50cff0423ac64bb1bb6ee3ea77bcd027
Autor:
A. H. Reid, X. Shen, P. Maldonado, T. Chase, E. Jal, P. W. Granitzka, K. Carva, R. K. Li, J. Li, L. Wu, T. Vecchione, T. Liu, Z. Chen, D. J. Higley, N. Hartmann, R. Coffee, J. Wu, G. L. Dakovski, W. F. Schlotter, H. Ohldag, Y. K. Takahashi, V. Mehta, O. Hellwig, A. Fry, Y. Zhu, J. Cao, E. E. Fullerton, J. Stöhr, P. M. Oppeneer, X. J. Wang, H. A. Dürr
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-9 (2018)
Although magnetostriction is universal in magnetic materials, understanding its microscopic origin remains challenging. Here the authors use X-ray and ultrafast electron diffraction to separate the material’s sub-picosecond spin and lattice respons
Externí odkaz:
https://doaj.org/article/9c806111a79449ffb41666dc3136ec7e
Autor:
Y. Zhang, X. J. Deng, Z. L. Pan, Z. Z. Li, K. S. Zhou, W. H. Huang, R. K. Li, C. X. Tang, A. W. Chao
Publikováno v:
Physical Review Accelerators and Beams, Vol 24, Iss 9, p 090701 (2021)
Low longitudinal emittance means small energy spread and short bunch length, which makes high-power short-wavelength coherent radiation possible. In a storage ring, due to quantum excitation, the equilibrium longitudinal emittance is mainly the overa
Externí odkaz:
https://doaj.org/article/af44bfc948f14004b68fa3991d5c2ef8
Autor:
X. Shen, J. P. F. Nunes, J. Yang, R. K. Jobe, R. K. Li, Ming-Fu Lin, B. Moore, M. Niebuhr, S. P. Weathersby, T. J. A. Wolf, C. Yoneda, Markus Guehr, Martin Centurion, X. J. Wang
Publikováno v:
Structural Dynamics, Vol 6, Iss 5, Pp 054305-054305-9 (2019)
The development of ultrafast gas electron diffraction with nonrelativistic electrons has enabled the determination of molecular structures with atomic spatial resolution. It has, however, been challenging to break the picosecond temporal resolution b
Externí odkaz:
https://doaj.org/article/e721e152a48b4e19a3075107ca6bcd06
Autor:
K. Sokolowski-Tinten, X. Shen, Q. Zheng, T. Chase, R. Coffee, M. Jerman, R. K. Li, M. Ligges, I. Makasyuk, M. Mo, A. H. Reid, B. Rethfeld, T. Vecchione, S. P. Weathersby, H. A. Dürr, X. J. Wang
Publikováno v:
Structural Dynamics, Vol 4, Iss 5, Pp 054501-054501-8 (2017)
We apply time-resolved MeV electron diffraction to study the electron-lattice energy relaxation in thin film Au-insulator heterostructures. Through precise measurements of the transient Debye-Waller-factor, the mean-square atomic displacement is dire
Externí odkaz:
https://doaj.org/article/3c832d2e2b7f4b689b53b62132575bdc
Autor:
L. Le Guyader, T. Chase, A. H. Reid, R. K. Li, D. Svetin, X. Shen, T. Vecchione, X. J. Wang, D. Mihailovic, H. A. Dürr
Publikováno v:
Structural Dynamics, Vol 4, Iss 4, Pp 044020-044020-7 (2017)
Transitions between different charge density wave (CDW) states in quasi-two-dimensional materials may be accompanied also by changes in the inter-layer stacking of the CDW. Using MeV ultrafast electron diffraction, the out-of-plane stacking order
Externí odkaz:
https://doaj.org/article/1c44a629ec2543ff8692969f06971476
Autor:
A. H. Reid, X. Shen, P. Maldonado, T. Chase, E. Jal, P. W. Granitzka, K. Carva, R. K. Li, J. Li, L. Wu, T. Vecchione, T. Liu, Z. Chen, D. J. Higley, N. Hartmann, R. Coffee, J. Wu, G. L. Dakowski, W. F. Schlotter, H. Ohldag, Y. K. Takahashi, V. Mehta, O. Hellwig, A. Fry, Y. Zhu, J. Cao, E. E. Fullerton, J. Stöhr, P. M. Oppeneer, X. J. Wang, H. A. Dürr
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-2 (2018)
“The technical support from SLAC Accelerator Directorate, Technology Innovation Directorate, LCLS laser division and Test Facility Division is gratefully acknowledged. We thank S.P. Weathersby, R.K. Jobe, D. McCormick, A. Mitra, S. Carron and J. Co
Externí odkaz:
https://doaj.org/article/18f432930aa64d5dae6e829d4aae1276
Autor:
R. K. Li, M. C. Hoffmann, E. A. Nanni, S. H. Glenzer, M. E. Kozina, A. M. Lindenberg, B. K. Ofori-Okai, A. H. Reid, X. Shen, S. P. Weathersby, J. Yang, M. Zajac, X. J. Wang
Publikováno v:
Physical Review Accelerators and Beams, Vol 22, Iss 1, p 012803 (2019)
We demonstrate single-shot temporal characterization of relativistic electron bunches using single-cycle terahertz (THz) field streaking. A transverse deflecting structure consisting of a metal slit enables efficient coupling of the THz field and ele
Externí odkaz:
https://doaj.org/article/5042d17613a44a14b3474fbbdcf70199