Study on Beam Steering in the PEFP 20 MeV DTL

The Proton Engineering Frontier Project (PEFP) is developing a proton linac which accelerate 20 mA proton beams up to 100 MeV. The accelerator consists of an ion source, a low energy beam transport (LEBT), a 3 MeV radio-frequency quadrupole (RFQ), a 100 MeV drift-tube linac (DTL). The DTL structure divides into two parts. One is a DTL (called DTL1) whose energy range is from 3 MeV to 20 MeV. It is designed to operate with 24% beam duty. The other is another DTL (called DTL2) for 20 ∼ 100 MeV with 8% beam duty. There is a MEBT between two DTL structures which will be operated with different beam duties. The main purposes of the MEBT are extracting 20 MeV proton beams to the user group and matching proton beams into the DTL2. This brief report related to the steering properties of the PEFP DTL tanks. For the beam dynamics study related with the steering magnets, we concentrated on the displacement error of the 20 MeV DTL tanks which consists of 4 tanks