An Acceptance Optimizer for High-Current Beamlines

A novel approach to the problem of beamlines development for high-current electron beam is put forward. An electron bunch is considered as a set of independently moving uniformly charged emittanceless slices with different currents, energies, and initial conditions. This locally cold beam model is accurate enough for space charge dominated beams if the bunch length in the center-of-mass system is much bigger than its transverse size. The model permits effective numerical maximization of the acceptance of a beamline to a beam, which parameters are known only approximately, and reliable prediction of beam loss. A simulation code implemented this approach is described. Some examples of existing and designed beamlines are presented.

Keywords:
space charge effect; locally cold beam model; beamline acceptance.
УДК 537.533.31; 537.533.79

An Acceptance Optimizer for High-Current Beamlines