Direct Measurement of Focusing Fields in Active Plasma Lenses

Abstract

Active plasma lenses have the potential to enable broad-ranging applications of plasma-based accelerators owing to their compact design and radially symmetric kT/m-level focusing fields, facilitating beam-quality preservation and compact beam transport. We report on the direct measurement of magnetic field gradients in active plasma lenses and demonstrate their impact on the emittance of a charged particle beam. This is made possible by the use of a well-characterized electron beam with 1.4 mm mrad normalized emittance from a conventional accelerator. Field gradients of up to 823 T/m are investigated. The observed emittance evolution is supported by numerical simulations, which suggest the potential for conservation of the core beam emittance in such a plasma lens setup.

arXiv comment17 pages, 7 Figures

References in corpus (4)

• Enhancement of electron energy to multi-GeV regime by a dual-stage laser-wakefield accelerator pumped by petawatt laser pulses
• Observation of Plasma Focusing of a 28.5 GeV Positron Beam
• Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications
• Analytic plasma wakefield limits for active plasma lenses

Cited by in corpus (5)

• Emittance Preservation in an Aberration-Free Active Plasma Lens
• Staging of High-Gradient Wakefield Accelerators
• FLASHForward: Plasma-wakefield accelerator science for high-average-power applications
• Multi-kT/m Focusing Gradient in a Linear Active Plasma Lens
• Uniform focusing of sequence of relativistic positron bunches in plasma