Coherent Terahertz synchrotron radiation mastered by controlling the irregular dynamics of relativistic electron bunches

Abstract

Spontaneous formation of spatial structures (patterns) occurs in various contexts, ranging from sand dunes and rogue wave formation, to traffic jams. These last decades, very practical reasons also led to studies of pattern formation in relativistic electron bunches used in synchrotron radiation light sources. As the main motivation, the patterns which spontaneously appear during an instability increase the terahertz radiation power by factors exceeding 10000. However the irregularity of these patterns largely prevented applications of this powerful source. Here we show how to make the spatio-temporal patterns regular (and thus the emitted THz power) using a point of view borrowed from chaos control theory. Mathematically, regular unstable solutions are expected to coexist with the undesired irregular solutions, and may thus be controllable using feedback control. We demonstrate the stabilization of such regular solutions in the Synchrotron SOLEIL storage ring. Operation of these "controlled unstable solutions" enables new designs of high charge and stable synchrotron radiation sources.

7 pages, 4 figures

References in corpus (6)

• Observing microscopic structures of a relativistic object using a time -stretch strategy
• Direct observation of spatio-temporal dynamics of short electron bunches in storage rings
• High density THz frequency comb produced by coherent synchrotron radiation
• High sensitivity photonic time-stretch electro-optic sampling of terahertz pulses
• A Parallelized Vlasov-Fokker-Planck-Solver for Desktop PCs
• Fast Mapping of Terahertz Bursting Thresholds and Characteristics at Synchrotron Light Sources

Cited by in corpus (4)

• Coherent radiation from a chain of charged particles on a circular orbit around a dielectric ball
• Simulation of the impact of an additional corrugated structure impedance on the bursting dynamics in an electron storage ring
• Coupled bunch stability with variable filling patterns in PETRA IV
• Cost-effective time-stretch terahertz recorders using 1550 nm probes