Abstract
We propose a new method to generate ultrashort x-ray pulses using focused short low energy ($\ensuremath{\sim}20\text{ }\mathrm{MeV}$) electron bunches to create short slices of electrons from the circulating electron bunches in a synchrotron radiation storage ring. When a low energy electron bunch crosses from the top of a high energy storage ring electron bunch, its Coulomb force will kick a short slice from the core of the storage ring electron bunch. The separated slices, when passing through an undulator, will radiate ultrashort x-ray pulses at about 160 fs. We discuss the advantages, challenges, and provide data which confirm the feasibility of this new method.
Highlights
The community interested in science using sub-picsecond x-ray pulses is growing rapidly
Even though the single pulse energy is much lower than the SASE FEL pulse, the high repetition rate and high pulse to pulse stability of storage ring sources continue to attract a wide range of user interests
We find the following advantages of this method when it is compared with other schemes respectively: (i) when compared with crab cavity method, it needs much smaller space in storage ring for interaction, and its radiation pulse length (∼160 fs) is much shorter. (ii) When compared with laser slicing method, its flux per pulse may be increased significantly, by a factor of from 6 to 10
Summary
The community interested in science using sub-picsecond x-ray pulses is growing rapidly. To generate ultrashort x-ray pulses with many orders of magnitude higher repetition rate, another method is proposed by Zholents [7,8] using a crab cavity which provides pulse length of order of a pic-second. A new source of ultrashort x-ray pulses is x-ray free electron laser, with the pulse energy many orders of magnitude higher than storage ring and pulse width of 100 fs or less [10]. (iii) When compared with LCLS SASE x-ray free electron laser, its repetition rate can be 103–104 orders of magnitude higher, and it is much more stable, even though the single shot pulse energy is many orders of magnitude lower. We expect the new method may provide a complimentary approach to other ultrashort x-ray pulse sources
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