期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 80, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3072883
关键词
aluminium; electron diffraction; high-speed techniques; relativistic electron beams; streak cameras
We theoretically and experimentally investigate the possibility of using a rf streak camera to time resolve in a single shot structural changes at the sub-100 fs time scale via relativistic electron diffraction. We experimentally tested this novel concept at the UCLA Pegasus rf photoinjector. Time-resolved diffraction patterns from thin Al foil are recorded. Averaging over 50 shots is required in order to get statistics sufficient to uncover a variation in time of the diffraction patterns. In the absence of an external pump laser, this is explained as due to the energy chirp on the beam out of the electron gun. With further improvements to the electron source, rf streak camera based ultrafast electron diffraction has the potential to yield truly single shot measurements of ultrafast processes.
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