Abstract
A radio-frequency photoinjector is widely used for generating picosecond-femtosecond electron bunches. During particle acceleration, the electron bunch shape varies under the influence of both the acceleration fields and space charge fields. To restore a distorted electron bunch, we propose an injection phase compensation technique for the electrons by illuminating the photocathode with a pulse-front-corrected laser pulse. Using an S-band 1.6-cell photoinjector as an example, our study shows that the proposed technique can generate nearly undistorted electron bunches up to a bunch rate of a few hundred terahertz.
Highlights
Ultrashort electron bunches are becoming available from advanced accelerator technologies and finding a variety of applications
We present a technique of partial phase compensation (PPC) for multibunch acceleration, in which only the initial phase spread of the central microbunch is modified iteratively through the routine depicted in Fig. 7 to achieve a delta-function-like electron bunch at the accelerator exit
Assuming the pulse front of individual laser pulses can be tailor designed and implemented, we study a full phase compensation (FPC) technique to generate a train of deltafunction electron bunches at the exit of the photoinjector
Summary
Ultrashort electron bunches are becoming available from advanced accelerator technologies and finding a variety of applications. In a freeelectron laser (FEL), a prebunched electron beam with periodic current modulation can generate copious harmonic power upon entering an undulator and is advantageous in rapidly building up the FEL power in a short undulator [1,2,3,4,5,6]. Another important application of a short electron bunch is ultrafast particle imaging that utilizes an ultrashort electron bunch to form a diffraction image with high temporal resolution [7,8,9,10,11,12,13]. It will be shown that the pulse-front-shaping technique is very effective in correcting the bunch distortion of both single- and multibunch electron beams during acceleration
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