PURPOSE: A magnetic field center measure system and method of the solenoid magnet can improve the quality of the beam transportation. CONSTITUTION: It is included inside the solenoid magnet of the hollow forming the bobbin(200) of cylindrical is the magnetic field. The first coil(310) is perpendicularly wound in the longitudinal direction central part of bobbin about the longitudinal direction of bobbin. The second coil(320) is wound according to the longitudinal direction of bobbin to the longitudinal direction of bobbin. The motor(400) is connected to one side of bobbin.
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