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

Direct Measurement of Focusing Fields in Active Plasma Lenses