| 摘要 |
PURPOSE:To compensate the influence of the hysteresis of an electromagnet and to analyze the energy of neutrons highly accurately by comparing a magnetic field to measure and the magnetic field obtained by the standard current value, and feeding the correction current responding to the resultant deviation magnetic field to an exciting coil for correction. CONSTITUTION:Not only the main exciting coil 14, but also an exciting coil 15 for correction are wound on an electromagnet 13, and the magnetic field generated when a standard current responding to the injection of the maximum neutron energy to a detector 17 positioned at the maximum Raman radius is fed to the main exciting coil 14 is measured by a magnetic field measuring device 19. At the same time, a correction current responding to the deviation between the magnetic field to measure and the magnetic field obtained by the standard current is fed to the correction exciting coil 15 from a correction exciting power source 21. As a result, even though a variation of the generated magnetic field is generated by the hysteresis property of the electromagnet 13, it can be compensated by the coil 15, and the neutral particle energy can be analyzed highly accurately.
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