Physical Review E, Volume 65, 046501 (2002).

Nonlinear electrostatic emittance compensation in kA, fs electron bunches

S.B. van der Geer, M.J. de Loos, Pulsar Physics
J.I.M. Botman, O.J. Luiten, M.J. van der Wiel, TU-Eindhoven

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 0.4 pi mm mrad.

URL: http://link.aps.org/abstract/PRE/v65/e046501
DOI:10.1103/PhysRevE.65.046501
PACS: 41.75.Lx, 07.05.Tp, 29.27.Bd, 41.85.Ne