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Recently, heavy-iron therapy has proved effective in cancer treatment and become an important means of treating the disease. To expand the spread of this excellent treatment technique, it is necessary to reduce the size of the system. We have developed and produced a new injector for this system in cooperation with the National Institute of Radiological Sciences in order to improve the injector for the system. The injector consists of an ECR ion source and two linacs: RFQ and DTL. For DTL, we adopted the IH acceleration structure and the APF focusing structure, and created designs for their optimization. We conducted an acceleration test with ion beams and accelerated carbon ions to 4.0 MeV/nucleon to identify the required performance. This is the world's first practical DTL adopting the two methods at the same time. Its development enabled us to drastically downsize the system.
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