Plasma and Fusion Research

Volume 11, 2406063 (2016)

Regular Articles

Study of H− Production in DC H− Source of Medical Cyclotron
Haruhiko ETOH, Moriaki ONAI1), Yasushi AOKI, Hitoshi MITSUBORI, Yoshihiko ARAKAWA, Junji SAKURABA, Takanori KATO, Toshinori MITSUMOTO, Satoru YAJIMA, Takanori SHIBATA2), Akiyoshi HATAYAMA1) and Yoshikazu OKUMURA3)
Sumitomo Heavy Industries, Ltd., Tokyo 141-6025, Japan
1)
Graduate School of Science and Technology, Keio University, Yokohama 223-8522, Japan
2)
High Energy Accelerator Research Organization (KEK), Tsukaba 305-0801, Japan
3)
Fusion Research and Development Directorate, Japan Atomic Energy Agency, Aomori 039-3212, Japan
(Received 30 November 2015 / Accepted 20 February 2016 / Published 10 June 2016)

Abstract

A filament driven multi-cusp negative hydrogen ion source has been developed for proton cyclotrons. In order to increase the H− beam current, the dependences of H− beam current on various design/operating parameters has been studied experimentally and numerically. In this paper, the effects of arc-discharge voltage and current on H− production via the volume production process are investigated by three-dimensional kinetic modeling of electrons in the source plasma and zero-dimensional rate equations. This numerical analysis reproduces the experimental results of H− beam current dependence on the arc-discharge condition, and also gives reasonable explanations for their characteristics.

Keywords

negative hydrogen ion source, medical cyclotron, EEDF, KEIO-MARC code

DOI: 10.1585/pfr.11.2406063

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References

  • [1] S.R. Walther, K.N. Leung and W.B. Kunkel, J. Appl. Phys. 64, 3424 (1988).
  • [2] H. Etoh et al., Rev. Sci. Instrum. 85, 02B107 (2014).
  • [3] H. Etoh et al., Rev. Sci. Instrum. 87, 02B135 (2016).
  • [4] M. Bacal et al., J. Appl. Phys. 52, 1247 (1981).
  • [5] J.M. Wadehra and J. N. Bardsley, Phys. Rev. Lett. 41, 1795 (1978).
  • [6] T. Shibata, M. Kashiwagi, T. Inoue, A. Hatayama and M. Hanada, J. Appl. Phys. 114, 143301 (2013).
  • [7] I. Fujino, A. Hatayama, N. Takado and T. Inoue, Rev. Sci. Instrum. 79, 02A510 (2008).
  • [8] R. Terasaki, I. Fujino, A. Hatayama, T. Mizuno and T. Inoue, Rev. Sci. Instrum. 81, 02A703 (2010).
  • [9] J.R. Hiskes, A.M. Karo, M. Bacal, A.M. Bruneteau and W.G. Graham, J. Appl. Phys. 53, 3469 (1982).
  • [10] J.R. Hiskes and A.M. Karo, J. Appl. Phys. 56, 7, 1927 (1984).
  • [11] J.R. Hiskes, A.M. Karo and P.A. Willmann, J. Appl. Phys. 58, 5, 1759 (1985).
  • [12] J. Bretagne, G. Delouya, C. Gorse, M. Capitelli and M. Bacal, J. Appl. Phys. D: Appl. Phys. 18, 811 (1985).
  • [13] O. Fukumasa and S. Saeki, J. Phys. D: Appl. Phys. 18, L21 (1985).
  • [14] J. Bretagne, G. Delouya, M. Capitelli, C. Gorse and M. Bacal, J. Phys. D: Appl. Phys. 19, 1197 (1986).
  • [15] C. Gorse, M. Capitelli, M. Bacal, J. Bretagne and A. Lagana, Chem. Phys. 117, 177 (1987).
  • [16] M. Ohmatsu, K. Shimura and M. Ogasawara, "Role of magnetic filter in the tandem type negative ion source," in Proc. 11th Symp. Ion Sources Ion-Assisted Technol., Tokyo, Japan, Jun. 1-3, 1987, pp.183-186.
  • [17] O. Fukumasa, J. Phys. D: Appl. Phys. 22, 1668 (1989).
  • [18] O. Fukumasa and S. Ohashi, J. Phys. D: Appl. Phys. 22, 1931 (1989).
  • [19] M. Ogasawara, M. Ohmatsu, T. Kawamura, K. Shimura and T. Yamakawa, "Modeling of magnetic filter in zerodimensional code for tandem negative ion source," in Proc. 13th Symp. Ion Sources Ion-Assisted Technol., Tokyo, Japan, Jun. 1-3, 1990, pp.83-88.
  • [20] M. Bacal, A. Hatayama and J. Peters, IEEE Trans. Plasma Sci. 33, 6, 1845 (2005).
  • [21] K.N. Leung, K.W. Ehlers and M. Bacal, Rev. Sci. Instrum. 54, 56 (1983).
  • [22] Ansys homepage (2015) (http://www.ansys.com/)
  • [23] C.K. Birdsal et al., in Plasma Physics via Computer Simulation, (IOP Publishing, Bristol, 1991), Chap. 2, pp.12-15.
  • [24] T. Takizuka et al., J. Comput. Phys. 25, 205 (1977).
  • [25] K. Nanbu et al., in Proc. Soviet Union-Japan Symp. Comput. Fuluid Dynamics, (Computing Center of the USSR Academy of Sciences, 1989), Vol.2, pp.126-132.
  • [26] R. Celiberto et al., At. Data Nucl. Data Tables 77, 161 (2001).
  • [27] R.K. Janev et al., Julich Report No. JUEL-4105, 2003.
  • [28] P.T. Grennland et al., Julich Report No. JUEL-3528, 1996.
  • [29] C. Courteile et al., Rev. Sci. Instrum. 64, 3265 (1993).