Development of energetic alpha particle induced gamma ray spectrometer

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This study is designated for 3.5MeV alpha particle physics produced by DT reaction in fusion plasmas, and is proposed that we can detect alpha particle induced gamma ray. The escaping energetic alpha particles collide with beryllium first wall followed by the B^9e(^4α, nγ)^<12> reaction. The principle is the detection of the induced 4.44MeV gamma ray, which is observed at far from the first wall. We can understand escaping alpha particles from the observed gamma ray. This method is expected to solve the problems of conventional lost alpha probe(detector location, and radiation hardness of components). We focused on the study on(a) gamma ray detection system based on the novel principle, and(b) heat endurance and radiation hardness optical components.