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Miyawaki, Nobumasa; Okumura, Susumu; Kurashima, Satoshi; Kashiwagi, Hirotsugu; Yoshida, Kenichi; Yuri, Yosuke; Yuyama, Takahiro; Ishibori, Ikuo; Agematsu, Takashi; Ishizaka, Tomohisa; et al.
Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.604 - 606, 2007/00
The main probe of the JAEA AVF cyclotron has been modified to measure a beam phase width in the accelerating region without extracting the beam from the cyclotron, which could cause the beam loss at the extraction device. The main probe consists of a carbon block for a beam current measurement and a plastic scintillator for a beam phase measurement. A correlation between the beam phase width and the position of phase slits was confirmed.
Okumura, Susumu; Arakawa, Kazuo; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Yokota, Wataru; Ishimoto, Takayuki*; Kurashima, Satoshi; Ishibori, Ikuo; Nara, Takayuki; Agematsu, Takashi; et al.
Review of Scientific Instruments, 76(3), p.033301_1 - 033301_6, 2005/03
Times Cited Count：9 Percentile：43.09(Instruments & Instrumentation)A magnetic field drift, gradual decrease of the order of 10
in several tens of hours, was observed with the beam intensity decrease in an operation of an azimuthally-varying-field (AVF) cyclotron. From our experimental results, we show that the temperature increase of the magnet iron by the heat transfer from the excitation coils can induce such change of the magnetic field as to deteriorate the beam quality. The temperature control of the magnet iron was realized by thermal isolation between the main coil and the yoke and by precise control of the cooling water temperature of the trim coils attached to the pole surfaces in order to prevent temperature change of the magnet iron. The magnetic field stability of 
5
10
and the beam intensity stability of 2% have been achieved by this temperature control.
Fukuda, Mitsuhiro; Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Ishii, Yasuyuki; Saito, Yuichi; Mizuhashi, Kiyoshi; Agematsu, Takashi; Chiba, Atsuya; Sakai, Takuro; et al.
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.643 - 645, 2004/08
A superconducting AVF cyclotron with a bending limit of 900 MeV and a focusing limit of 300 MeV is being designed to meet the requirements for the research in materials science and biotechnology at TIARA facility of JAERI. The spiral-sector shape of the cyclotron magnet has been optimized for acceleration of a 300 MeV proton to produce sufficient focusing forces in an extraction region. An energy range of the superconducting AVF cyclotron overlaps with that of the present K110 JAERI AVF cyclotron. Characteristics of a resonator for the superconducting AVF cyclotron have been investigated using the MAFIA code. An acceleration voltage in a frequency range of 24 to 64 MHz can be produced by the resonator with a 
/2 excitation mode.
Fukuda, Mitsuhiro; Okumura, Susumu; Ishii, Yasuyuki; Saito, Yuichi; Miyawaki, Nobumasa; Mizuhashi, Kiyoshi; Agematsu, Takashi; Kurashima, Satoshi; Chiba, Atsuya; Sakai, Takuro; et al.
Dai-14-Kai Kasokuki Kagaku Kenkyu Happyokai Hokokushu, p.302 - 304, 2003/00
no abstracts in English
Okumura, Susumu; Arakawa, Kazuo; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Yokota, Wataru; Ishimoto, Takayuki*; Kurashima, Satoshi; Ishibori, Ikuo; Nara, Takayuki; Agematsu, Takashi; et al.
AIP Conference Proceedings 600, p.330 - 332, 2001/00
Frequent corrections of the magnetic field of the JAERI AVF cyclotron were required for keeping a beam current constant during long time operation. We observed correlation between the magnetic field and the temperature of the cyclotron magnet yoke by measuring the magnetic field with an NMR probe and the temperature with platinum resistance thermometers. The unstable phenomenon of a cyclotron beam was induced by temperature change in the magnet yoke caused mainly by thermal conduction from the main coil. To restrain the thermal conduction to the yoke, we have inserted temperature controlled copper plates between the yoke and the main coil. In addition, a temperature control system of the cooling water of the trim coils has been installed independent of the total cooling system for controlling the pole tip temperature. An optimum condition of the temperature control systems for stabilizing the magnetic field has been investigated.
Okumura, Susumu; Kurashima, Satoshi; Ishimoto, Takayuki*; Yokota, Wataru; Arakawa, Kazuo; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Ishibori, Ikuo; Nara, Takayuki; Agematsu, Takashi; et al.
Proceedings of 13th Symposium on Accelerator Science and Technology, p.283 - 285, 2001/00
no abstracts in English
Agematsu, Takashi; Arakawa, Kazuo; Okumura, Susumu; Nakamura, Yoshiteru; Yokota, Wataru; Nara, Takayuki; Fukuda, Mitsuhiro; Ishibori, Ikuo; *; Tachikawa, T.*
Proc. of the 9th Symp. on Accelerator Science and Technology, p.65 - 67, 1993/00
no abstracts in English
Yokota, Wataru; Nara, Takayuki; Arakawa, Kazuo; Nakamura, Yoshiteru; Fukuda, Mitsuhiro; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tachikawa, T.*; *; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.336 - 339, 1993/00
no abstracts in English
Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; *; Tanaka, Ryuichi; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.119 - 122, 1993/00
no abstracts in English
*; *; Tachikawa, T.*; Agematsu, Takashi; Okumura, Susumu; Arakawa, Kazuo
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.644 - 647, 1993/00
no abstracts in English
Yokota, Wataru; Fukuda, Mitsuhiro; Arakawa, Kazuo; Nakamura, Yoshiteru; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tachikawa, T.*; *; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.581 - 584, 1993/00
no abstracts in English
Tachikawa, T.*; *; *; *; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Agematsu, Takashi; Nara, Takayuki; et al.
Proceedings of the International Conference on Evolution in Beam Applications, p.270 - 274, 1992/00
no abstracts in English
Yokota, Wataru; Arakawa, Kazuo; Nakamura, Yoshiteru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Tanaka, Ryuichi; Tachikawa, T.*; Mita, T.*; Sato, T.*
Proceedings of 12th International Conference on Cyclotrons and Their Applications (CYCLOTRONS 89), p.388 - 391, 1991/07
no abstracts in English
Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tanaka, Ryuichi; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.34 - 36, 1991/00
no abstracts in English
Yokota, Wataru; Ishibori, Ikuo; Okumura, Susumu; Agematsu, Takashi; Fukuda, Mitsuhiro; Nara, Takayuki; Kamiya, Tomihiro; Nakamura, Yoshiteru; Arakawa, Kazuo; Tachikawa, T.*; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.70 - 72, 1991/00
no abstracts in English
C.Dupont*; Y.Jongen*; Arakawa, Kazuo; Yokota, Wataru; *; Tachikawa, T.*
Review of Scientific Instruments, 61(1), p.265 - 266, 1990/01
Times Cited Count：6 Percentile：62.09(Instruments & Instrumentation)no abstracts in English
Yokota, Wataru; Arakawa, Kazuo; Tachikawa, T.*; *; C.Dupont*; Y.Jongen*
Proc. of the 7th Symp. on Accelerator Science and Technology, p.68 - 70, 1989/00
no abstracts in English
Fukuda, Mitsuhiro; Kamiya, Tomihiro; Arakawa, Kazuo; *; Tachikawa, T.*; *
Proceedings of the 7th Symposium on Accelerator Science and Technology, p.152 - 154, 1989/00
no abstracts in English
; ; ; ; ; *; *; *
Nuclear Physics A, 456, p.298 - 316, 1986/00
Times Cited Count：14 Percentile：62.08(Physics, Nuclear)no abstracts in English
*; *;
JAERI-M 85-018, 18 Pages, 1985/03
no abstracts in English
