Estimation of Ion Beam Trajectories for a Slot Aperture Accelerator of Long-Pulse Ion Source in Neutral Beam Injector


A neutral beam injection (NBI) system has been developed and is being tested for an Experimental Advanced Superconducting Tokamak (EAST) device. The NBI system needs to be employed for an auxiliary heating and current drive of EAST plasmas. The first long pulse ion source (LPIS-1) has been installed in the neutral beam test bed (NBTB) system, and the performance is being tested in the NBTB. The LPIS-1 consists of a magnetic bucket plasma generator with multipole cusp-fields and a set of tetrode accelerators with slit-type apertures (a transparency of 60%). The ion beam trajectories of the accelerator column are estimated for the LPIS-1, including an original structure, with the change of slit aperture distance, plasma grid shape, grid gap distance, and voltage ratio between a plasma grid and a gradient grid using the IGUN code. This kind of calculation for the ion beam trajectory may be useful for the estimation of beam extraction characteristics and the direction of accelerator upgrade or modification, prior to the experiments of ion beam extraction.

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D. Chang, "Estimation of Ion Beam Trajectories for a Slot Aperture Accelerator of Long-Pulse Ion Source in Neutral Beam Injector," Open Journal of Applied Sciences, Vol. 3 No. 2, 2013, pp. 163-168. doi: 10.4236/ojapps.2013.32022.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] 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, “Status of the ITER Heating Neutral Beam System,” Nuclear Fusion, Vol. 49, No. 4, 2009, Article ID: 045006.
[2] L. R. Grisham, P. Agostinetti, G. Barrera, P. Blatchford, D. Boilson, J. Chareyre, G. Chitarin, H. P. L. de Esch, A. De Lorenzi, P. Franzen, U. Fantz, M. Gagliardi, R. S. Hemsworth, M. Kashiwagi, D. King, A. Krylov, M. Kuriyama, N. Marconato, D. Marcuzzi, M. Roccella, L. Rios, A. Panasenkov, N. Pilan, M. Pavei, A. Rizzolo, E. Sartori, G. Serianni, P. Sonato, V. Pilard, M. Tanaka, H. Tobari, P. Veltri and P. Zaccari, “Recent Improvements to the ITER Neutral Beam System Design,” Fusion Engineering and Design, Vol. 87, No. 11, 2012, pp. 1805-1815.
[3] D. Ciric, D. P. D. Brown, C. D. Challis, B. Chuilon, S. J. Cox, B. Crowley, I. E. Day, D. C. Edwards, G. Evison, L. J. Hackett, S. Hotchin, Z. Hudson, I. Jenkins, T. T. C. Jones, R. King, M. Kovari, D. Martin, J. Milnes, A. Parkin, A. Li Puma, M. Shannon, A. Stevens, D. Stork, E. Surrey, C. Waldon, R. Warren, D. Wilson, D. Young and I. D. Young, “Overview of the JET Neutral Beam Enhancement Project,” Fusion Engineering and Design, Vol. 82, No. 5-14, 2007, pp. 610-618. doi:10.1016/j.fusengdes.2007.07.046
[4] H. W. Kugel, G. M. Gammel, L. R. Grisham, R. Kaita, J. H. Camperschroer, R. A. Langley, C. W. Magee, S. S. Medley, T. J. Murphy, A. L. Roquemore and M. D. Williams, “Measurements of Neutral Beam Species, Impurities, Spatial Divergence, Energy Dispersion, Pressure, and Reionization Using the TFTR U.S. Common Long Pulse Ion Source,” Review of Scientific Instruments, Vol. 60, No. 1, 1989, pp. 37-52. doi:10.1063/1.1140578
[5] K. H. Burrel, “Inject 2 MW of Neutral Beam Power in the Counter Direction on DIII-D and Begin Physics Experiments,” GA-C25590, General Atomics, San Diego, 2006.
[6] Y. Ikeda, the NBI Heating Group and NCT Design Team, “Progress of Neutral Beam Injection System on JT-60U for Long Pulse Operation,” Journal of the Korean Physical Society, Vol. 49, No. 96, 2006, pp. S43-S47.
[7] Y. S. Bae, Y. M. Park, J. S. Kim, W. S. Han, S. W. Kwak, Y. B. Chang, H. T. Park, N. H. Song, H. L. Yang, S. W. Yoon, Y. M. Jeon, S. H. Hahn, S. G. Lee, W. H. Ko, A. C. England, W. C. Kim, Y. K. Oh, J. G. Kwak, M. Kwon, D. H. Chang, S. H. Jeong, T. S. Kim, B. H. Oh, J. T. Jin, S. R. In, K. W. Lee, D. S. Chang, K. Watanabe, M. Dairaku, H. Tobari, M. Kashiwagi, M. Hanada, T. Inoue, Y. Ikeda, M. Kawai, M. Komata, K. Mogaki, K. Usui, T. Yamamoto, M. Matsuoka, K. Nagaoka and L. Grisham, “Comissioning of the First KSTAR Neutral Beam Injection System and Beam Experiments,” Fusion Engineering and Design, Vol. 87, No. 9, 2012, pp. 1597-1610. doi:10.1016/j.fusengdes.2012.05.011
[8] C. D. Hu, L. Z. Liang, Y. L. Xie, J. L. Wei, Y. H. Xie, J. Li, Z. M. Liu, S. Liu, C. C. Jiang, P. Sheng and Y. J. Xu, “Design of Neutral Beam-Line of EAST,” Plasma Science and Technology, Vol. 13, No. 5, 2011, pp. 541-545. doi:10.1088/1009-0630/13/5/06
[9] C. D. Hu and NBI Team, “Conceptual Design of Neutral Beam Injection System for EAST,” Plasma Science and Technology, Vol. 14, No. 6, 2012, pp. 567-572. doi:10.1088/1009-0630/14/6/30
[10] C. D. Hu, Y. H. Xie, S. Liu, Y. L. Xie, C. C. Jiang, S. H. Song, J. Li and Z. M. Liu, “First Plasma of Megawatt High Current Ion Source for Neutral Beam Injector of the Experimental Advanced Superconducting Tokamak on the Test Bed,” The Review of Scientific Instruments, Vol. 82, No. 2, 2011, Article ID: 023303.
[11] C. D. Hu, Y. L. Xie and NBI Team, “The Development of a Megawatt-Level High Current Ion Source,” Plasma Science and Technology, Vol. 14, No. 1, 2012, pp. 75-77. doi:10.1088/1009-0630/14/1/16
[12] Y. J. Xu, C. D. Hu, S. Liu, Y. H. Xie, L. Z. Liang and C. C. Jiang, “Preliminary Experimental Study of Ion Beam Extraction of EAST Neutral Beam Injector,” Chinese Physics Letters, Vol. 29, No. 3, 2012, Article ID: 035201.
[13] W. B. Kunkel, “Giant Sources of Neutral-Beam Injectors for Fusion (Invited),” Review of Scientific Instruments, Vol. 61, No. 1, 1990, pp. 354-359. doi:10.1063/1.1141292
[14] R. Hong and H. K. Chiu, “Effects of Operating Parameters on the Beam Species of DIII-D Neutral Beam Ion Sources,” 19th Symposium on Fusion Engineering, Atlantic City, 21-25 January 2002, pp. 40-43.
[15] R. Becker and W. B. Herrannsfeldt, “IGUN-A Program for the Simulation of Positive Ion Extraction Including Magnetic Fields,” Review of Scientific Instruments, Vol. 63, No. 4, 1992, pp. 2756-2758. doi:10.1063/1.1142795
[16] J. Kim, D. H. Chang, D. S. Chang, S. R. In, S. H. Jeong, J. T. Jin, K. S. Jung, B. Y. Kim, T. S. Kim, K. W. Lee, B. H. Oh, C. S. Seo, M. S. Seo, W. S. Song and B. J. Yoon, “An Ion Optics Study for KSTAR Neutral Beam Injector Development,” The Review of Scientific Instruments, Vol. 79, No. 2, 2008, Article ID: 02C104.
[17] T.-S. Kim, S. H. Jeong, D.-H. Chang, S.-R. In, B.-H. Oh, D.-S. Chang, J.-T. Jin, C. S. Seo, K.-W. Lee, W.-S. Song and J.-C. Kim, “Beam Characteristics Study for the KSTAR Neutral Beam Long Pulse Ion Source,” Current Applied Physics, Vol. 11, No. 5, 2011, pp. S145-S148. doi:10.1016/j.cap.2011.04.022
[18] R. M. Hong, B. G. Scoville, J. L. Busath, R. W. Callis, H. K. Chiu, H. J. Grunloh, C. Hu and M. G. Madruga, “Performance of a DIII-D Neutral Beam Ion Source with a New Accelerator Grid,” 21st IEEE/NPS Symposium on Fusion Engineering, Knoxville, September 2005, pp. 1-3.

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