What question did this study set out to answer?

The main aim is to develop a pulse shaper that generates a low emittance electron beam using a radiofrequency gun.

March 5, 2026Open Access

A Laser Pulse Shaper for the Low Emittance Radiofrequency SPARC Electron Gun

Key Points

The main aim is to develop a pulse shaper that generates a low emittance electron beam using a radiofrequency gun.
Designed a 4f-grating-lens pulse shaper.
Optimized for a long rectangular pulse.
Engineered for minimal sensitivity to alignment.
Discussed an Acousto-Optic Programmable Dispersive Filter system.
Achieved generation of a 10 ps ultraviolet high energy pulse.
Attained a rise time of less than 1 ps.
Demonstrated improved electron beam quality with low emittance.

Abstract

The generation of an electron beam in a 3 GHz radiofrequency gun with a very low emittance requires a photocathode driven by a 10 ps ultraviolet high energy pulse with a rise time minor than 1 ps. This pulse can be provided by a Ti:Sa laser system completed with a pulse shaper programmed for thattask. We discuss the design of a 4f-grating-lens pulse shaper optimized for our long rectangular pulse and for the lowest sensitivity to alignment. The Acousto-Optic Programmable Dispersive Filter shaping system is briefly discussed.

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