Study of the design of CSNS MEBT

The design of CSNS MEBT has two objectives:(1) to match the beam both in the transversal direction and the longitudinal direction from RFQ into DTL;(2) to further chop the beam into the required time structure asked by RCS. It is very diffcult and critical to control well the emittance growth and in the meantime to match and chop the beam. Firstly,the optical design is done and optimized,and the multi-particle simulations show that the maximum emittance growth is successfully controlled within 14%. Secondly...