TITLE

Simulation of cesium injection and distribution in rf-driven ion sources for negative hydrogen ion generation

AUTHOR(S)
Gutser, R.; Fantz, U.; W├╝nderlich, D.
PUB. DATE
February 2010
SOURCE
Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02A706
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Cesium seeded sources for surface generated negative hydrogen ions are major components of neutral beam injection systems in future large-scale fusion experiments such as ITER. Stability and delivered current density depend highly on the cesium conditions during plasma-on and plasma-off phases of the ion source. The Monte Carlo code CSFLOW3D was used to study the transport of neutral and ionic cesium in both phases. Homogeneous and intense flows were obtained from two cesium sources in the expansion region of the ion source and from a dispenser array, which is located 10 cm in front of the converter surface.
ACCESSION #
48352618

 

Related Articles

  • Long pulse H- beam extraction with a rf driven ion source on a high power level. Kraus, W.; Fantz, U.; Franzen, P. // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02B110 

    IPP Garching is investigating the applicability of rf driven negative ion sources for the neutral beam injection of International Thermonuclear Experimental Reactor. The setup of the tested source was improved to enable long pulses up to 100 kW rf power. The efficiency of negative ion production...

  • Development of a surface ionization type dual-ion source applicable to ionic crystalline samples. Kawano, Hiroyuki; Kamidoi, Susumu; Shimizu, Hironari // Review of Scientific Instruments;Mar96, Vol. 67 Issue 3, p1387 

    Reports on the development of a surface ionization type dual-ion source (DIS) applicable to ionic crystalline samples of alkali halides. Ionic and neutral emission rates; Primary ion collection efficiency; Temperature dependence of primary and secondary ion currents; Detection of a neutral beam...

  • Status of Negative-Ion-Based Neutral Beam Injectors in LHD. Kaneko, Osamu; Takeiri, Yasuhiko; Oka, Yoshihide; Tsumori, Katsuyoshi; Osakabe, Masaki; Ikeda, Katsunori; Nagaoka, Kenichi; Kawamoto, Toshikazu; Kondo, Tomoki; Sato, Mamoru // AIP Conference Proceedings;2005, Vol. 763 Issue 1, p17 

    Recent progress in LHD N-NBI system is described. The system was designed to provide 15 MW of port-through beam power by three Beam Lines (BL-1 to BL-3) with 180 keV hydrogen for 10 sec. However, starting from 3.2 MW injection by two beam lines in 1998, their performance has not yet satisfied...

  • Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited). Kojima, A.; Hanada, M.; Tanaka, Y.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H.; Grisham, L. R.; JT-60 NBI Group // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02B112 

    Developments of the large negative ion source have been progressed in the high-energy, high-power, and long-pulse neutral beam injector for JT-60 Super Advanced. Countermeasures have been studied and tested for critical issues of grid heat load and voltage holding capability. As for the heat...

  • Characterization of 1 MW, 40 keV, 1 s neutral beam for plasma heating. Sorokin, A.; Belov, V.; Davydenko, V.; Deichuli, P.; Ivanov, A.; Podyminogin, A.; Shikhovtsev, I.; Shulzhenko, G.; Stupishin, N.; Tiunov, M. // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02B108 

    Neutral beam with geometrical focusing for plasma heating in moderate-size plasma devices has been developed in Budker Institute of Nuclear Physics, Novosibirsk. When operated with hydrogen, the neutral beam power is 1 MW, pulse duration is 1 s, beam energy is 40 keV, and angular divergence is...

  • Numerical simulation for the accelerator of the KSTAR neutral beam ion source. Tae-Seong Kim; Seung Ho Jeong; Sang Ryul In // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02B106 

    Recent experiments with a prototype long-pulse, high-current ion source being developed for the neutral beam injection system of the Korea Superconducting Tokamak Advanced Research have shown that the accelerator grid assembly needs a further upgrade to achieve the final goal of 120keV/65A for...

  • Development of a negative ion-based neutral beam injector in Novosibirsk. Ivanov, A. A.; Abdrashitov, G. F.; Anashin, V. V.; Belchenko, Yu. I.; Burdakov, A. V.; Davydenko, V. I.; Deichuli, P. P.; Dimov, G. I.; Dranichnikov, A. N.; Kapitonov, V. A.; Kolmogorov, V. V.; Kondakov, A. A.; Sanin, A. L.; Shikhovtsev, I. V.; Stupishin, N. V.; Sorokin, A. V.; Popov, S. S.; Tiunov, M. A.; Belov, V. P.; Gorbovsky, A. I. // Review of Scientific Instruments;2014, Vol. 85 Issue 2, p1 

    A 1000 keV, 5 MW, 1000 s neutral beam injector based on negative ions is being developed in the Budker Institute of Nuclear Physics, Novosibirsk in collaboration with Tri Alpha Energy, Inc. The innovative design of the injector features the spatially separated ion source and an electrostatic...

  • Physics design of the injector source for ITER neutral beam injector (invited). Antoni, V.; Agostinetti, P.; Aprile, D.; Cavenago, M.; Chitarin, G.; Fonnesu, N.; Marconato, N.; Pilan, N.; Sartori, E.; Serianni, G.; Veltri, P. // Review of Scientific Instruments;2014, Vol. 85 Issue 2, p1 

    Two Neutral Beam Injectors (NBI) are foreseen to provide a substantial fraction of the heating power necessary to ignite thermonuclear fusion reactions in ITER. The development of the NBI system at unprecedented parameters (40 A of negative ion current accelerated up to 1 MV) requires the...

  • Assessment and modification of an ion source grid design in KSTAR neutral beam system. Dong Won Lee; Kyu In Shin; Hyung Gon Jin; Bo Guen Choi; Tae-Seong Kim; Seung Ho Jeong // Review of Scientific Instruments;2014, Vol. 85 Issue 2, p1 

    A new 2 MW NB (Neutral Beam) ion source for supplying 3.5 MW NB heating for the KSTAR campaign was developed in 2012 and its grid was made from OFHC (Oxygen Free High Conductivity) copper with rectangular cooling channels. However, the plastic deformation such as a bulging in the plasma grid of...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics