If the identical cavity tanks are applied to coupled-cavity drift tube lina
c (CCDTL) structure in a proton linac, the fabrication and tuning procedure
s of the CCDTL will be simplified, and the cost of the linac construction c
an be reduced. In this paper new definition of particle dynamics coefficien
ts is introduced, a design method of identical cavity CCDTL tanks is discus
sed, some calculation results are presented.