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1 2003

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Development of a magnetic field monitoring system for the JAERI AVF cyclotron

Okumura S., Arakawa K., Fukuda M., Nakamura Y., Yokota W., Ishimoto T., Kurashima S., Ishibori I., Nara T., Agematsu T., Nakajima T.

Nukleonika

2003

Vol. 48,suppl.2

35-37

We have developed a probe of a nuclear magnetic resonance (NMR) magnetometer for measurement of a fluctuation of an AVF cyclotron field. The stability of the magnetic field of the JAERI AVF cyclotron, measured with the NMR probe, was within 1 × 10-5. A field-measurement accuracy of the order of 1 × 10-6 was achieved using a set of field-compensation coils and optimizing the probe position to obtain enough homogeneity of the magnetic field around the probe for measuring the cyclotron field with a high gradient. To eliminate a major bottleneck in the field measurement inside the cyclotron, the probe was specially produced with the cable shielding against RF noises and proper materials applied.