Landau Damping with Electron Lenses in Space-Charge Dominated Beams

Further progress of fundamental physics requires accelerated beams of high intensity. The intensities, however, are limited by many factors, including coherent beam instabilities. Usual methods to control the instabilities, such as octupole magnets, beam feedback dampers and employment of chromatic effects, may be ineffective or insufficient. Electron lenses were proposed as a means to provide stabilizing spread in the beam betatron frequencies. It was shown that electron lenses are uniquely effective for Landau damping of transverse beam instabilities in high energy particle accelerators, and that their employment does not compromise incoherent (single particle) stability, dynamic aperture and the beam lifetime. Here we consider effectiveness of the Landau damping with electron lenses when the space charge tune shift cannot be neglected. We demonstrate that the desired stability can be assured with proper choice of the electron beam parameters and current distributions.

Automated summary

Accelerated beams of high intensity in fundamental physics are limited by coherent beam instabilities, for which usual methods may be insufficient. Electron lenses have been proven to effectively provide Landau damping of transverse beam instabilities, ensuring stability without compromising incoherent stability, dynamic aperture, and beam lifetime. Proper choice of electron beam parameters and current distributions can ensure desired stability even when space charge tune shift cannot be neglected.