  Generally, a standard bunching system is composed by a SW pre-buncher, a TW
buncher and a standard accelerating section. However, there is one way to
simplify the whole system to some extent by using the hybrid buncher, which is
a combined structure of the SW pre-buncher and the TW buncher. Here the beam
dynamics studies on an S-band bunching system with the hybrid buncher is
presented, simulation results shows that similar beam performance can be
obtained at the linac exit by using this kind of bunching system rather than
the standard one. In the meantime, the structure design of the hybrid buncher
is also described. Furthermore, the standard accelerating section can also be
integrated with the hybrid buncher, which can further simplify the usual
bunching system and lower the construction cost.
