Energy spread of ultracold electron bunches extracted from a laser cooled gas

Abstract

Ultrashort and ultracold electron bunches created by near-threshold femtosecond photoionization of a laser-cooled gas hold great promise for single-shot ultrafast diffraction experiments. In previous publications the transverse beam quality and the bunch length have been determined. Here the longitudinal energy spread of the generated bunches is measured for the first time, using a specially developed Wien filter. The Wien filter has been calibrated by determining the average deflection of the electron bunch as a function of magnetic field. The measured relative energy spread $\frac{{\sigma }_U}{U}=0.64\pm 0.09\%$ agrees well with the theoretical model which states that it is governed by the width of the ionization laser and the acceleration length.

References in corpus (3)

• Compression of sub-relativistic space-charge-dominated electron bunches for single-shot femtosecond electron diffraction
• Pulse length of ultracold electron bunches extracted from a laser cooled gas
• Improving temporal resolution of ultrafast electron diffraction by eliminating arrival time jitter induced by radiofrequency bunch compression cavities

Cited by in corpus (2)

• Compact ultracold electron source based on a grating magneto optical trap
• Expansion of Ultracold Neutral Plasmas with Exponentially Decaying Density Distributions