A tailored high-gradient alpha-magnet plus a low-jitter photoinjector simultaneously compress relativistic electron bunches to sub-5-fs rms duration and synchronize them to a laser at the few-fs level, per the authors' experimental claim.
Magnetic Compressors for MeV-UED
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abstract
Magnetic compressors offer an attractive path toward jitter-free bunch compression in MeV-UED. Compared with RF bunchers, magnetic compressors do not introduce additional timing jitter and can be configured to minimize timing jitter due to upstream energy fluctuation. In this work we discuss the principles of designing magnetic compressors for MeV-UED. Start-to-end simulation of a dogleg compressor is presented. Results show a bunch length of 11 fs and arrival time jitter of 8 fs can be achieved at 100 fC charge with small emittance growth.
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Sub-5-fs compression and synchronization of relativistic electron bunches enabled by a high-gradient $\alpha$-magnet and low-jitter photoinjector
A tailored high-gradient alpha-magnet plus a low-jitter photoinjector simultaneously compress relativistic electron bunches to sub-5-fs rms duration and synchronize them to a laser at the few-fs level, per the authors' experimental claim.