Feasibility study for a recirculating linac-based facility for femtosecond dynamics | |
Corlett, J.N. ; Barry, W. ; Barletta, W.A. ; Byrd, J.M. ; DeSantis, S. ; Doolittle, L. ; Fawley, W. ; Green, M.A. ; Hartman, N. ; Heimann, P. ; Kairan, D. ; Kujawski, E. ; Li, D. ; Lidia, S. ; Luft, P. ; McClure, R. ; Parmigiani, F. ; Petroff, Y. ; Pirkl, W. ; Placidi, M. ; Reavill, D. ; Reichel, I. ; Rimmer, R.A. ; Ratti, A. ; Robinson, K.E. ; Sannibale, F. ; Schoenlein, R. ; Staples, J. ; Tanabe, J. ; Truchlikova, D. ; Wan, W. ; Wang, S. ; Wells, R. ; Wolski, A. ; Zholents, A. | |
Lawrence Berkeley National Laboratory | |
关键词: Harmonic Generation; Compression; Photons; Wavelengths; Excitation; | |
DOI : 10.2172/810867 RP-ID : LBNL--51766 RP-ID : AC03-76SF00098 RP-ID : 810867 |
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美国|英语 | |
来源: UNT Digital Library | |
【 摘 要 】
LBNL is pursuing design studies and the scientific program for a facility dedicated to the production of x-ray pulses with ultra-short time duration, for application in dynamical studies of processes in physics, biology, and chemistry. The proposed x-ray facility has the short x-ray pulse length ({approx}60 fs FWHM) necessary to study very fast dynamics, high flux (up to approximately 10E11 photons/sec/0.1 percentBW) to study weakly scattering systems, and tuneability over 1-12 keV photon energy. The hard x-ray photon production section of the machine accommodates seven 2-m long undulators. Design studies for longer wavelength sources, using high-gain harmonic generation, are in progress. The x-ray pulse repetition rate of 10 kHz is matched to studies of dynamical processes (initiated by ultra-short laser pulses) that typically have a long recovery time or are not generally cyclic or reversible and need time to allow relaxation, replacement, or flow of the sample. The technique for producing ultra-short x-ray pulses uses relatively long electron bunches to minimize high-peak-current collective effects, and the ultimate x-ray duration is achieved by a combination of bunch manipulation and optical compression. Synchronization of x-ray pulses to sample excitation signals is expected to be of order 50 - 100 fs. Techniques for making use of the recirculating geometry to provide beam-based signals from early passes through the machine are being studied.
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