Demonstration of cascaded modulator-chicane micro-bunching of a relativistic electron beam

Abstract

We present results of an experiment showing the first successful demonstration of a cascaded micro-bunching scheme. Two modulator-chicane pre-bunchers arranged in series and a high power mid-IR laser seed are used to modulate a 52 MeV electron beam into a train of sharp microbunches phase-locked to the external drive laser. This configuration allows to increase the fraction of electrons trapped in a strongly tapered inverse free electron laser (IFEL) undulator to 96\%, with up to 78\% of the particles accelerated to the final design energy yielding a significant improvement compared to the classical single buncher scheme. These results represent a critical advance in laser-based longitudinal phase space manipulations and find application both in high gradient advanced acceleration as well as in high peak and average power coherent radiation sources.

References in corpus (3)

• Dielectric Laser Acceleration
• Beam by design: laser manipulation of electrons in modern accelerators
• High efficiency energy extraction from a relativistic electron beam in a strongly tapered undulator

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• Theoretical and Experimental Studies on Steady-state Microbunching
• Beam Dynamics in Dielectric Laser Acceleration
• Machine learning-based direct solver for one-to-many problems on temporal shaping of relativistic electron beams