Plasma and Fusion Research

Volume 8, 2405060 (2013)

Regular Articles

Behavior of Negative Ion and Secondary Particles in Multi-Aperture Accelerator

Masashi KISAKI, Pierluigi VELTRI¹⁾, Piero AGOSTINETTI¹⁾, Katsuyoshi TSUMORI, Katsunori IKEDA, Haruhisa NAKANO, Gianluigi SERIANNI¹⁾, Masaki OSAKABE, Kenichi NAGAOKA, Yasuhiko TAKEIRI and Osamu KANEKO

: National Institute for Fusion Science, Toki 509-5292, Japan
1): Consorzio RFX, Padova, 35126, Italy

(Received 7 December 2012 / Accepted 6 March 2013 / Published 22 May 2013)

Abstract

The trajectories of the H⁻ and the secondary particle in a multi-aperture accelerator for negative ion sources were calculated with a 3D numerical code, taking into account non-uniformity in magnetic field and negative ion density, and the heat loading on acceleration grids was estimated. The heat loading on a grounded grid mainly originates from the secondary electron impact and the non-uniform transverse magnetic field enhances the possibility of the secondary electron impacts on the grounded grid. Perveance condition of beamlets strongly depends on the plasma density profile and the direct interception of the H⁻ by an extraction grid is enhanced in the non-uniform plasma case.

Keywords

negative ion source, NBI, accelerator, charged particle beam, numerical calculation

DOI: 10.1585/pfr.8.2405060

Full Text

PDF format (1.3Mbytes) PDF Download

References

[1] Y. Takeiri, K. Ikeda, Y. Oka, K. Tsumori, M. Osakabe, K. Nagaoka, O. Kaneko, E. Asano, T. Kondo, M. Sato, M. Shibuya and S. Komada, Rev. Sci. Instrum. 77, 03A523 (2006).
[2] A. Kojima, M. Hanada, A. Hilmi, T. Inoue, K. Watanabe, M. Taniguchi, M. Kashiwagi, N. Umeda, H. Tobari, S. Kobayashi, Y. Yamamo and L.R. Grisham, Rev. Sci. Instrum. 83, 02B117 (2012).
[3] R. Hemsworth, H. Decamps, J. Graceffa, B. Schunke, M. Tanaka, M. Dremel, A. Tanga, H.P.L de Esch, F. Geli, J. Milnes, T. Inoue, D. Marcuzzi, P. Sonato and P. Zaccaria, Nucl. Fusion 49, 045006 (2009).
[4] T. Morishita, K. Miyamoto, Y. Fujiwara, M. Handa, T. Kitagawa, M. Kashiwagi, Y. Okumura and K. Watanabe, Rev. Sci. Instrum. 73, 1064 (2002).
[5] M. Kisaki, M. Hanada, M. Kamada, Y. Tanaka, K. Kobayashi and M. Sasao, AIP Conf. Proc. 1097, 344 (2009).
[6] P. Agostinetti, V. Antoni, M. Cavenago, G. Chitarin, H. Nakano, N. Pilan, G. Serianni, P. Veltri, Y. Takeiri and K. Tsumori, AIP Conf. Proc. 1390, 526 (2011).
[7] M. Hanada, Y. Fujiwara, K. Miyamoto, N. Miyamoto, Y. Okumura and K. Watanabe, Rev. Sci. Instrum. 69, 947 (1998).
[8] M. Hamabe, Y. Takeiri, K. Ikeda, Y. Oka, M. Osakabe, K. Tsumori, E. Asano, T. kawamoto and O. Kaneko, Rev. Sci. Instrum. 72, 3237 (2001).
[9] G. Fubiani, H.P.L. de Esch, A. Simonin and R.S. Hemsworth, Phys. Rev. ST Accel. Beams 11, 014202 (2008).
[10] OPERA-3d, Vector Field Co. Ltd.
[11] J. Pamela, Rev. Sci. Instrum. 62, 1163 (1991).

This paper may be cited as follows:

Masashi KISAKI, Pierluigi VELTRI, Piero AGOSTINETTI, Katsuyoshi TSUMORI, Katsunori IKEDA, Haruhisa NAKANO, Gianluigi SERIANNI, Masaki OSAKABE, Kenichi NAGAOKA, Yasuhiko TAKEIRI and Osamu KANEKO, Plasma Fusion Res. 8, 2405060 (2013).