Design Study of High Intensity Beam lines using Radiation Resistant Magnets

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It is very difficult to design the vacuum ducts which are used in the magnets near the production target of the high power beam accelerator such as J-PARC. In order to eliminate vacuum ducts from magnet gaps, we developed the magnet system which enabled us to operate large scale radiation resistant magnets in vacuum. The proto-type of the system was constructed and tested by use of the real size beam line magnets. After fixing several problems, we found that the system could work reasonably. This technical result was immediately employed at the real construction of the beam lines near the target station of J-PARC Hadron Facility. The result was also selected the oral presentation at 20^<th> international conference on magnet technology (MT20).