title: Nonlinear electrostatic emittance compensation in kA, fs electron bunches.
abstract: Nonlinear space-charge effects play an important role in emittance growth in the production of kA electron bunches with a bunch length much smaller than the bunch diameter. We propose a scheme employing the radial third-order component of an electrostatic acceleration field, to fully compensate the nonlinear space-charge effects. This results in minimal transverse root-mean-square emittance. The principle is demonstrated using our design simulations of a device for the production of high-quality, high-current, subpicosecond electron bunches using electrostatic acceleration in a 1 GV/m field. Simulations using the GPT code produce a bunch of 100 pC and 73 fs full width at half maximum pulse width, resulting in a peak current of about 1.2 kA at an energy of 2 MeV. The compensation scheme reduces the root-mean-square emittance by 34% to 0.4pi mm mrad.
authors: Pulsar Physics, De Bongerd 23, 3762 XA Soest, The Netherlands.
authors: S B
authors: SB
authors: van der Geer
authors: M J
authors: MJ
authors: de Loos
authors: J I M
authors: JI
authors: Botman
authors: O J
authors: OJ
authors: Luiten
authors: M J
authors: MJ
authors: van der Wiel