| 摘要 |
PURPOSE:To make possible a desired magnetic field distribution by a method wherein correcting coils are inserted in the gap between the poles of a polarization electromagnet and the magnetic field distribution in the direction of an electron beam orbit and the magnetic field distribution in the direction vertical to this direction are so contrived as to be able to be corrected at the same time. CONSTITUTION:Correcting coils 2 are each formed by a method wherein a plurality of (x) direction correcting coils 2x and a plurality of (s) direction correcting coils 2s are each arranged at a right angle to each other and are resin-sealed. The numerous correcting coils are inserted between the poles of a polarization electromagnet 1 in such a way that a uniform magnetic field distribution can be obtained within an electron beam orbital plane. The optimum combination of coil is so contrived as to be selected while both ends of the correcting coils are held in an open state to measure the magnetic field between the poles and the magnetic field distribution in the direction of the electron beam orbit and the magnetic field distribution in the direction vertical to this direction are both so contrived as to be able to be corrected at the same time. The correcting coils are inserted between the magnetic poles of the polarization electromagnet of an electron storage ring or an accelerating ring one piece by one piece in close proximity to the upper and lower magnetic poles and a current is flowed from a driving circuit synchronizing with the excitation state of the polarization electromagnet. Thereby, a prescribed magnetic field distribution can be obtained, the polarization electromagnet can be used up to a high magnetic field and the external shape of the ring can be lessened. |
