Plasma and Fusion Research

Volume 5, S1014 (2010)

Regular Articles

Optimization of the Accelerators for the ITER Neutral Beam Injector Project

Vanni ANTONI, Piero AGOSTINETTI, Marco CAVENAGO¹⁾, Hubert P. L. DE ESCH²⁾, Gwenael FUBIANI³⁾, Nicola PILAN, Gianluigi SERIANNI, Pierluigi VELTRI, Mieko KASHIWAGI⁴⁾, Masaki TANIGUCHI⁴⁾, Naotaka UMEDA⁴⁾, Takashi INOUE⁴⁾ and NBI RFX TEAM

: Consorzio RFX Euratom-ENEA Association, Padova, 35126, Italy
1): INFN-LNL, Legnaro, 35020, Italy
2): Association EURATOM-CEA Cadarache, IRFM/SCCP, St. Paul Les Durance, 13108, France
3): LAPLACE/CNRS, University Paul Sabatier, Toulouse, 31062, France
4): Japan Atomic Energy Agency, Naka, 311-0193, Japan

(Received 2 February 2009 / Accepted 21 June 2009 / Published 26 March 2010)

Abstract

A joint Japan-EU R&D activity is in progress to optimize the accelerator for the ITER NBI. The accelerator baseline design is based on a five grids system which can be adapted to operate with three grids for initial operations at low voltage (500 kV). Moreover, in order to speed up the test of the NBI system at the Test Facility, a negative ion source with extraction voltage up to 100 kV will be operated in parallel to the full injector. In this contribution the three accelerators mentioned above are presented discussing the procedure to optimize the grid geometry in order to assure optimum optics during operation when the grids undergo deformations and thermal stresses due to the particles that hit their surface.

Keywords

ITER, heating and current drive, negative ion acceleration

DOI: 10.1585/pfr.5.S1014

Full Text

PDF format (1.0Mbytes) PDF Download

References

[1] R.S. Hemsworth et al., Rev. Sci. Instrum. 67, Issue 3, 1120 (1996).
[2] T. Inoue et al., Fusion Eng. Des. 56-57, 517 (2001).
[3] R.S. Hemsworth et al., Rev. Sci. Instrum. 79, 02C109 (2008).
[4] P. Sonato et al., 25th Symposium on Fusion Technology, 15-19 September 2008, Rostock, Germany.
[5] M. Taniguchi et al., AIP Conf. Proc. 1097, 335 (2009).
[6] H.P.L De Esch et al., Fusion Eng. Des. 84, 669 (2009); G. Fubiani et al. Phys. Rev. Special Topics, Accelerator and Beams 12, 050102 (2009).
[7] M. Kashiwagi et al., to be published in Nucl. Fusion.
[8] H.P.L. de Esch, R.S. Hemsworth and P. Massmann. Fusion Eng. Des. 73, 329 (2005).
[9] ITER Technical Basis 2002, Detailed Design Document (section 5.3 DDD5.3) (Vienna: IAEA).
[10] J. Pamela, Rev. Sci. Instrum. 62, 1163 (1991).
[11] W.B. Hermannsfeld, Electron Trajectory Program, SLAC report, Stanford Linear Accelerator Center, SLAC-226 (1979).
[12] M. Cavenago et al., IEEE Trans. Plasma Sci. 36, 1581 (2008).
[13] G. Fubiani et al., Phys. Rev. Special Topics Accelerators and Beams 11, 014202 (2008).
[14] “OPERA-3d”, Vector Fields Co.Ltd., http://www. vectorfields.com/
[15] P. Agostinetti et al., Proceedings of the 1st International Conference on Negative Ions, Beams and Sources, 2008, Aix en Provence, France.
[16] P. Agostinetti, S. Dal Bello, M. Dalla Palma, D. Marcuzzi, P. Zaccaria, R. Nocentini, M. Frschle, B. Heinemann and R. Riedl, 22nd IEEE/NPSS Symposium on Fusion Engineering, Albuquerque, New Mexico, 2007.
[17] E. Speth et al., Nucl. Fusion 46, S220 (2006).
[18] D. Marcuzzi et al., 25th Symposium on Fusion Technology, 15-19 September 2008, Rostock, Germany.
[19] Various Authors, ITER MPH. Material Properties Handbook. ITER Document No.G 74 MA 16.
[20] P. Agostinetti, S. Dal Bello, M. Dalla Palma and P. Zaccaria, Fusion Eng. Des. 82, 860 (2007).
[21] M. Kashiwagi et al., to be published in Conf. Proc. of American Inst. Phys. 2008.
[22] M. Kashiwagi et al., Proceedings of the 1st International Conference on Negative Ions, Beams and Sources, 2008, Aix en Provence, France.

This paper may be cited as follows:

Vanni ANTONI, Piero AGOSTINETTI, Marco CAVENAGO, Hubert P. L. DE ESCH, Gwenael FUBIANI, Nicola PILAN, Gianluigi SERIANNI, Pierluigi VELTRI, Mieko KASHIWAGI, Masaki TANIGUCHI, Naotaka UMEDA, Takashi INOUE and NBI RFX TEAM, Plasma Fusion Res. 5, S1014 (2010).