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For the injector Scheme-I test stand of the China-ADS, a beam with themaximum power of 100 kW will be produced and transported to the beam dump. Atthe beam dump, the beam power will be converted to thermal load and broughtaway by the cooling water. Two measures are taken to deal with the huge powerdensity at the target. One is to enlarge the contact area between the beam andthe target, and this is to be accomplished by expanding the beam profile at thetarget and using two copper plates each having a 20o inclination angle relativeto the beam direction. The other is to produce more homogenous beam profile atthe target to minimize the maximum power density. Here the beam dump line isdesigned to meet the requirement of beam expansion and homogenization, and thestep-like field magnets are employed for the beam spot homogenization. Thesimulations results including space charge effects and errors show that thebeam line can meet the requirements very well at the three different energies(3.2 MeV, 5 MeV and 10 MeV). In the meantime, the alternative beam design usingstandard multipole magnets is also presented.

Transverse profile expansion and homogenization at target for the injector Scheme-I test stand of China-ADS