| 摘要 |
An undulator comprises a first magnetic circuit ( 11 ) for forming a periodic magnetic field, a first support body ( 21 ) for supporting the first magnetic circuit ( 11 ), a second magnetic circuit ( 12 ) arranged opposite to the first magnetic circuit ( 11 ), for forming a periodic magnetic field, a second support body ( 22 ) for supporting the second magnetic circuit ( 12 ), a space ( 13 ) formed between the oppositely arranged first magnetic circuit ( 11 ) and the second magnetic circuit ( 12 ), for passing an electron beam, a vacuum chamber ( 1 ) for vacuum-sealing the first magnetic circuit ( 11 ) and the second magnetic circuit ( 12 ), and a refrigerant passing tube ( 30 ) for cooling a permanent magnet (m) constituting the first magnetic circuit ( 11 ) and the second magnetic circuit ( 12 ) below the room temperature.
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