Space Charge Effect at Transition Energy and the Transfer of RF System at Top Energy

摘要

Using 100 kV R.F. system, the beam loss due to transition crossing can be reduced to 1% for the phase space area of 0.3ev /center dot/ sec/amu. However the space charge effect would increase the phase space area to 1ev /center dot/ sec/amu after the transition energy. By using gamma /sub t/ jump or gamma increase, the phase space area can be preserved to 0.3ev /center dot/ sec/amu. To obtain small bunch length at the collision energy, we study the bunch rotation scheme. We find that the R.F. harmonic number should be less than 6 x 342 to obtain good efficiency and larger than 4 x 342 to reach experimental requirement. 5 refs., 13 figs., 2 tabs. (ERA citation 13:054600)