Temporal magnification for streaked ultrafast electron diffraction and microscopy

Cesar, D.; Musumeci, P.

doi:10.1016/j.ultramic.2019.01.003

Cited by 4 publications

(1 citation statement)

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“…Resonant radiofrequency (rf) cavities in particular have found significant use over the past two decades in time-resolved electron diffraction and microscopy. Highlights of a versatile range of applications include: compressing electron pulses in time to the femtosecond scale and below [7][8][9][10][11][12][13][14], temporal magnification of ultrafast events [15,16], impulsive acceleration and deceleration of beams over short distances [13,[17][18][19][20], chopping continuous beams into short-pulses [20][21][22][23], and the controlled introduction of time-of-arrival correlations for performing energy measurements [13,24]. Radiofrequency cavities are the workhorses of particle acceleration at primary energies above 1 MeV.…”

Section: Introductionmentioning

confidence: 99%

Lossless monochromation for electron microscopy with pulsed photoemission sources and rf cavities

Duncan,

Muller,

Maxson

2020

Preprint

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Resonant radiofrequency cavities enable exquisite time-energy control of electron beams when synchronized with laser driven photoemission. We present a lossless monochromator design that exploits this fine control in the one-electron-per-pulse regime. The theoretically achievable maximum beam current on target is orders of magnitude greater than state-of-the-art monochromators for the same spatial and energy resolution. This improvement is the result of monochromating in the time domain, unconstrained by the transverse brightness of the electron source. We show analytically and confirm numerically that cavity parameters chosen to minimize energy spread perform the additional function of undoing the appreciable effect of chromatic aberration in the upstream optics. We argue that our design has significant applications in both ultra-fast and non-time-resolved microscopy, provided photoelectron sources of sufficiently small size and laser sources of sufficiently high repetition rate. Our design achieves in simulations more than two orders of magnitude reduction in beam energy spread, down to single digit meV. Overcoming the minimum probe-size limit that chromatic aberration imposes, our design clears a path for high-current, high-resolution electron beam applications at primary energies from single to hundreds of keV.

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