Direct measurement of sub-10 fs relativistic electron beams with ultralow emittance

Abstract

Ultralow emittance ($\le 20$ nm, normalized) electron beams with $10^5$ electrons per bunch are obtained by tightly focusing an ultrafast ($\sim$ 100 fs) laser pulse on the cathode of a 1.6 cell radiofrequency photoinjector. Taking advantage of the small initial longitudinal emittance, a downstream velocity bunching cavity is used to compress the beam to $<10$ fs rms bunch length. The measurement is performed using a thick high voltage deflecting cavity which is shown to be well-suited to measure ultrashort durations of bunching beams, provided that the beam reaches a ballistic longitudinal focus at the cavity center.

References in corpus (5)

• New electron source concept for single-shot sub-100 fs electron diffraction in the 100 keV range
• Coherent and incoherent electron-phonon coupling in graphite observed with radio-frequency compressed ultrafast electron diffraction
• Ultrafast Electron-Phonon Decoupling in Graphite
• Demonstration of single-shot picosecond time-resolved MeV electron imaging using a compact permanent magnet quadrupole based lens
• Plasma-driven ultrashort bunch diagnostic

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