Abstract
When a low energy electron bunch ($\ensuremath{\sim}20\text{ }\mathrm{MeV}$) crosses from top of a high energy bunch (e.g., 3 GeV) at an angle (e.g., 45\ifmmode^\circ\else\textdegree\fi{}), the Coulomb force exerted on the high energy bunch by the low energy bunch will kick a very short ($\ensuremath{\sim}150\text{ }\text{ }\mathrm{fs}$) slice from the core of the high energy bunch. The slice of electron bunch can generate ultrashort x-ray pulse. In this paper, we will give analytical expressions about the angular kicks dependence on the crossing angle by assuming a Gaussian distribution for the low energy bunch. Applying the analytical results to the storage ring bunch in NSLS-II [1], we will discuss the optimized parameters of the electron beam slicing system in order to obtain a very short slice bunch and a sufficient separation between the slice and the core bunch.
Highlights
With the rapid increase in the requirements for subpic-second x-ray pulses in science, several approaches to generate ultrashort x-ray pulses have been proposed
Assume xr 1⁄4 yr 1⁄4 zr 1⁄4 0, i.e., when the electron in the storage ring bunch arrives at the origin of the coordinate system, the center of the low energy bunch just arrives at the position on the top of the origin by vertical distance d 1⁄4 50 μm, we have y1 1⁄4 1; u 1 1⁄4 0, and we find fy 1⁄4 0.54
We presented formulas in Eq (13), Eq (19), and Eq (23), which can be used to study the characteristics of the electron beam slicing
Summary
With the rapid increase in the requirements for subpic-second x-ray pulses in science, several approaches to generate ultrashort x-ray pulses have been proposed. Each of them has their own characteristics, for example, the pulse duration from laser slicing [2,3,4,5,6,7] can reach the order of 100 fs, the pic-second x-ray pulses generated by the crab cavity method [8,9,10] have high average flux (∼1014 photons= sec =0.1%bw) and high repetition rate (several hundreds MHz), the pulses produced from x-ray free electron laser [11] are good at higher pulse energy and shorter pulse width. We discuss the parameter requirements of the electron beam slicing system, i.e., the low energy bunch beam size and the crossing angle, in order to carry out electron beam slicing experiment in the storage ring of NSLS-II.
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