Tracking study of the new injection bump system of the HLS ring

In this paper, a summary of the existing three-kicker injection bump system of the HLS ring is presented and a new lattice-independent, four-kicker bump system which has been proposed for the second phase project of NSRL is described. Conditions for generating a bump orbit by four kickers are discussed. A theory of multiturn injection based on single-particle dynamics is introduced to analyse the conditions to achieve multiturn injection. Tracking study of the new system are carried out to verify the correctness of the scheme. Parameters such as dimension of the injected beam phase space ellipse, tolerance of the injected beam energy dispersion, timing jitter allowance of the kickers, etc., are calculated.