| 摘要 |
In an undulator magnet array (1B), an upper magnet array (10B) is formed by coupling an upper shift magnet array (10SB) and an upper reference magnet array (10RB), and a lower magnet array (20B) is formed by coupling a lower reference magnet array (20RB) and lower shift magnet array (20SB) arranged so as to face the magnet arrays (10SB, 10RB). With reference to a state where the amplitudes of periodic magnetic fields that can be formed by the upper magnet array and the lower magnet array are maximized, the upper shift magnet series (10SB) is shifted 1/4 of a period to the left as seen from the lower reference magnet array (20RB) and the lower shift magnet array (20SB) is shifted 1/4 of a period to the left as seen from the upper reference magnet array (10RB). |
