Ａnalysis on quadrupole system condition analysis of 9MeV traveling wave ＬＩＮＡＣ

Aiming at the triplet quadrupole system of 9 MeV traveling wave ＬＩＮＡＣ used for customs container inspection system, this paper analyses that the influences of beam focusing characteristics between quadrupole and skew quadrupole system. Along with analysis of focusing parameters, the errors of manufacture and installation are made for triplet quadrupoles. Finally, the method of choosing parameters and the reasonable tolerance requirement are described theoretically. Calculations mentioned above are accomplished by using the beamdynamics program TRANSPORT.