電子ビームイオン源用水平設置超伝導コイルおよびクライオスタットの製作

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An electron beam ion source nicknamed NICE-I (Naked Ion Collision Experiments) has been constructed at IPP for studies of atomic processes in fusion plasmas. A super conducting magnet is adopted to generate a strong, stable and homogenious magnetic field to compress a high density electron beam. The solenoid is 1m long, the inner diameter is 100mm and the maximum magnetic field is 2T. It is placed horizontally and coaxially with a liquid nitrogen (L-N_2) reservoir and a vacuum vessel. In order to fix their axes inmovable even when the reservoirs are cooled by L-N_2 and He, a structure having spokes strained uniformly like a wheel is used between the vacuum vessel and the L-N_2 reservoir and also between the L-N_2 reservoir and the solenoid bore. The electrodes, such as the electron gun, the drift tubes and so on, are mounted on the radiation shields fixed on the L-N_2 reservoir, and they are centered to the solenoid bore within the precision of 0.1mm. The evapolation rate of L-He is about 1.4ι/h, which is not so much larger than the estimated value. This provides a continuous operation for 16 hours with a charge of 50ι L-He including the precooling of the reservoir. The ultimate pressure 4×10^<-10> Torr is achived in the vacuum vessel, and the residual gas pressure in the ionization region is expected to be much lower than 1×10^<-10> Torr. The consideration for mechanical strength and the heat conduction of the materials related to the design are described as well as the details of the structure.
核融合科学研究所の論文

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