Diagnostics systems for the study of physics issues related to alpha-particles

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Self-heating of a DT plasma by fusion-produced alpha particles is the key to realise self-sustainable ignition of a thermonuclear plasma in a fusion reactor, and physics related to alpha particles will become more important in the next-stage burning plasma experiments. In this project, fusion product measurements were studied from the viewpoint of alpha particle-related physics researches. Major results of this project are:[1] The transition mechanism to an improved mode, which is necessary to realize a burning plasma was studied experimentally, and the neoclassical theory was validated. [2] Several methods to measure confined alpha particles were examined, and R & D issues were specified. [3] Several methods to measure lost alpha particles were examined, and R & D issues were specified. [4] A new type of scintillator, which can be used to measure lost alpha particles under high temperature, was developed. [5] Various neutron measurement systems were examined, and R & D issues were specified. [6] A new neutron spectrometer for the deuteron/triton density ratio measurement was developed. [7] Combined the studies mentioned above, review papers of fusion products diagnostics were written in journals.