Temperature control of a cyclotron magnet for stabilization of the JAERI AVF cyclotron beam

Okumura, Susumu; Arakawa, Kazuo; Fukuda, Mitsuhiro; Nakamura, Y.; Yokota, W.; Ishimoto, T.; Kurashima, Satoshi; Ishibori, I.; Nara, T.; Agematsu, Takashi; Tamura, H.; Matsumura, Akitaka; Sano, M.; Tachikawa, Tatsuya

doi:10.1063/1.1435267

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“…Since the start of the cyclotron routine operation at TIARA in 1991, we have experienced a rapid decrease of beam intensity during several tens of hours after the cyclotron was excited. The reason has been identified to be the fact that the magnetic field strength of the cyclotron drifts by the order of 10 -4 due to a small change in temperature of the magnet yoke by several degrees [2]. We analyzed the data of the magnet temperature and the magnetic field of the cyclotron, and made heat conduction simulation with a computer code.…”

Section: Stabilization Of the Cyclotron Beam Currentmentioning

confidence: 99%

Development of Cyclotron Beam Technology for Applications in Materials Science and Biotechnology at JAERI-TIARA

Ohara¹,

Arakawa²,

Fukuda³

et al. 2003

AIP Conference Proceedings

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Recent progress of cyclotron ion beam development for applications in materials science and biotechnology at the ion-irradiation research facility TIARA of the Japan Atomic Energy Research Institute(JAERI) is overviewed. The AVF cyclotron in TIARA can accelerate protons and heavy ions up to 90 MeV and 27.5 MeV/n, respectively. In order to conform to the requirement of a reliable tuning of microbeam formation, the cyclotron beam current has been stabilized by controlling the temperature of the magnet yoke and pole within +/-0.5 o and hence by decreasing the variation of the magnetic field ∆B/B below 10-5. A heavy ion microbeam with energy of hundreds MeV is a significantly useful probe for researches on biofunctional elucidation in biotechnology. Production of the microbeam with spot size as small as 1µm by quadrupole lenses requires the energy spread of the beam ∆E/E < 2 x 10-4. In order to minimize the energy spread of the cyclotron beam, the fifth-harmonic voltage waveform has been successfully superposed on the fundamental one to make energy gain uniform.

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Section: Stabilization Of the Cyclotron Beam Currentmentioning

confidence: 99%