  The injection system of the China Spallation Neutron Source uses H- stripping
and phase space painting method to fill large ring acceptance with the linac
beam of small emittance. The emittance evolution, beam losses, and collimation
efficiency during the injection procedures for different injection parameters,
such as the injection emittances, starting injection time, twiss parameters and
momentum spread, were studied, and then the optimized injection parameters was
obtained. In addition, the phase space painting scheme which also affect the
emittance evolution and beam losses were simulated and the optimization range
of phase space painting were obtained. There will be wobble in the power supply
of the injection bumps, and the wobble effects were presented. In order to
study the transverse coupling, the injection procedures for different betatron
tunes and momentum spreads were studied.
