The intensity and brightness of a circulating proton (ion) beam can be increased up to the Laslett space charge tune shift limit (ΔQ~0.3) by means of charge exchange injection or by electron cooling. Significantly higher brightness can be produced by means of charge exchange injection with space charge compensation. However, the brightness of the space charge compensated beam is limited at low level by the electron-proton (e-p) instability, sometimes known as the electron cloud instability.
Fortunately, the e-p instability can be self-stabilized at high beam density. A Beam Brightness Booster (BBB) for production of a “superintense” circulating beam with intensity and brightness far above the space charge limit (calculated ΔQ>>1) is proposed. Energy loss in the high-current H- injection gas jet stripping target also provides ionization cooling to compensate multiple scattering to prevent emittance growth, energy straggling, and particle loss. This BBB requires a broadband feedback system for e-p instability suppression and can be simplified by development of a nonlinear nearly integrable focusing system with a broad spread of betatron tunes to provide Landau damping. Electrons are prevented from overloading the induction acceleration system in the BBB by a novel ExB field trap.