Design of IH-DTL with PMQ focusing for medical RI production

Yasuda, Hiromasa*; Omika, Shuichiro*; Sako, Takayuki*; Sato, Kiyokazu*; Kondo, Yasuhiro   ; Otani, Masashi*

We have conducted the conceptual design of the IH-DTL with the permanent-magnet quadrupole (PMQ) focusing for the medical radioisotope (RI) production. For At-211 production, a helium beam should be accelerated over 7.25 MeV/u. The lattice of the PMQs inside IH-DTL was designed as FFOODDOO so that the gradient of PMQ was lower. The cell parameters were also designed from the periodical structure of the PMQ lattice and the commercial semiconductor RF power supply specifications. After designing the cell parameters, we evaluated the beam dynamics with the space-charge effect by 2D/3D design of cavity and beam tracking. With 2D design of three DTL tanks, the helium beam is accelerated over 7.25 MeV/u with over 90% transmission. 3D design of the first tank cavity was also conducted. After the geometry of cavity was optimized with the ridge tuner and cavity taper, the transmission was over 95% with 3D cavity model of the first tank.