[en] A project for the construction of heavy particle beam cancer treatment facilities, called the Heavy Ion Medical Accelerator in Chiba (HIMAC) Project, has been under way since 1987. The report describes major characteristics of heavy ions in relation to their medical application, and outlines features of the HIMAC Project. The planned equipment will produce a maximum energy of 800 MeV/nucleon. It is impossible for a single accelerator to accelerate ions up to this energy and therefore, a composite acceleration system is used which contains a synchrotron at the final stage. An electron cyclotron resonance (ECR) type ion source design, which has been greatly improved in recent years, is adopted in developing the planned large-current ion source. A RFQ-type linac with a voltage of 60 kV or less is used at the first stage to facilitate the development of the ion source, while an Alvarez-type linac is adopted at the second stage. The main accelerator synchrotron consists of two 0.5 Hz rings to allow vertical and horizontal beams with different energies to be combined in the irradiation field. The beam transport system has to be large in size because high-energy vertical beams are required. The irradiation system, which is 10 m in total length, consists of wobbler scanning equipment for uniform irradiation of the maximum 22 cm diameter field, a range shifter to increase the Bragg peak, and a multileaf collimater for achieving a desired shape of the irradiation field. (N.K.)

[en] The heavy ion science research committee had worked on the promotion of heavy ion science, which consist of various fields on nuclear physics, solid state physics, nuclear chemistry, radiation chemistry and biology, during 1971 ∼ 1976. This is a report of its activity and present status of the researches of the various fields. (author)

[en] The National Institute of Radiological Sciences, Japan, has started in 1987 a project for constructing 'the Heavy Ion Medical Accelerator in Chiba' (HIMAC). The HIMAC was designed to apply high-energy heavy ions in both the clinical and fundamental research settings, with the aim of effective diagnosis and treatment for a great diversity of cancer patients. Stability and reliability, which are different from those in the accelerator used for the purpose of fundamental research alone, are therefore required. Simplicity in operation, maintenance, automation, and the potential improvement in performance are also considered as important issues. An outline of HIMAC, together with characteristics of heavy ions, is given in figurative and tabular forms. (Namekawa, K.)

[en] The construction of a Test Accumulation Ring for NUMATRON Project, TARN, was finished and the first injection test was performed successfully in August, 1979. For testing the beam accumulation technology by a combination of multiturn injection and RF stacking, He₂⁺, H²⁺ and H⁺ beams of 7 MeV/u were used so far. Through this work, various technical problems for the NUMATRON have been investigated

[en] The Institute of Nuclear Study of University of Tokyo is promoting the Numatron project, in which main event is the construction of a high-energy heavy-ion accelerator with the ability of accelerating very heavy ions (up to uranium) to very high energy (1 GeV per nucleon). This report reviews the design of the accelerator and the possible applications in various fields including engineering and medical science. The performance characteristics of the Numatron are compared with those of other existing or projected accelerators in the world. The design of the Numatron is primarily based on the proven technologies. Gradual incorporation of newly developed technologies is also considered. At the start point, however, the PIG type heavy ion source will be used. The heavy ions from the source are accelerated by combination of accelerators, the final stage of which is a synchrotron. Intensity of the ion beam at each stage, various modes of operation, and main parameters of the Numatron are shown together with the plan of the equipment arrangement. (Aoki, K.)

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[en] In the last few years, heavier ions and higher energy are called for in several fields of researches and applications, especially among nuclear physicists in Japan. Responding to such demands a study group has been organized at the Institute for Nuclear Study, University of Tokyo, in order to promote basic studies for the construction of a high-energy heavy-ion facility named NUMATRON, which should provide heavy ions up to uranium in an energy range of 100 -- 1000 MeV per nucleon. In this talking, the outline for the design study of the accelerator is described. (author)

[en] Research results in heavy ion sciences centered on those in fiscal 1977, with research subsidies from the Ministry of Education, are presented in individual reports. It is the third, essentially final, year of research efforts. Ideas behind are establishment of the field, enhancement of inter-disciplinary efforts and formation of an 'intangible' institute. Covered are broadly heavy ion sources development, acceleration technology development, nuclear physics research, material science and material engineering, and chemistry and biology. (Mori, K.)

[en] The NUMATRON project is in progress in Japan. The project includes the construction of a new heavy ion accelerator which can accelerate any kind of heavy ions. The maximum energy of the accelerated ions will be 2 GeV/nucleon. The accelerator consists of an ion source, a pre-accelerator, an injector linac, and a dual synchrotron. The first stage linac will be operated with 25 MHz period, and the pulse frequency will be 1 pulse for 40 ns. The output energy of the beam from the synchrotron will be varied by a control system. The width of the momentum of beam will be deteriorated by about 2 percent, and the emittance by 200 mm.mrad. A new design to increase the beam intensity is investigated. The machine will be used for the research on heavy ion solid state physics at low energy, on heavy ion physics and nuclear physics at medium energy, and on nuclear physics, medical science and nuclear fusion technology at high energy. (Kato, T.)