Table 1. Parameter list of basic buncher cavities.

Parameter	4-gap cavity	5-gap cavity
Inner diameter [mm]	46.21	62.00
Drift tube diameter [mm]	17	12
Bore diameter [mm]	6	4
Overall length L [mm]	72.87	91.09
Gap length [mm]	3.74	5.55
Unloaded quality factor Q0	8813	12984
Transit-time factor	0.71	0.81
Eff. shunt impedance ZTT [$\frac{\mathrm{M}\Omega }{\mathrm{m}}$]	35	77