There are neutron generators or 'howitzers' which use an electrostatic field to accelerate deutrons into tritated targets to create 14.1 MeV neutrons. However, the deuteron current is so low and the scattering so great that more energy is put in than developed by fusion. The objective however in this system is neutron generation.
A relatively compact system using electostatic fields is the fusor -
http://en.wikipedia.org/wiki/Fusor
http://en.wikipedia.org/wiki/Inertial_electrostatic_confinement (article may contain unverified claims - reader beware)
I don't believe that a practical fusor for energy production has been developed.In Tokamak, neutral particle beams are injected into the plasma. The NPBs use electrostatic fields to accelerate deuterons into the plasma chamber.
The problem is the scattering and the acceleration of nuclei/ions and electrons causes energy loss due to cyclotron and brehmsstrahlung radiation. Because of high temperatures in the plasma, magnetic confinement is essential for most fusion reactor concepts, with the exception of inertial confinement systems.