TITLE

Negative ion formation at a barium surface in contact with a hydrogen plasma

AUTHOR(S)
van Os, C. F. A.; Heeren, R. M. A.; van Amersfoort, P. W.
PUB. DATE
November 1987
SOURCE
Applied Physics Letters;11/9/1987, Vol. 51 Issue 19, p1495
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Measurements on the production of negative hydrogen ions at a barium surface, in contact with a hydrogen plasma, are presented and discussed. In spite of the high work function of barium compared to more conventional cesiated converter surfaces, considerable yields of negative ions were produced. Conversion efficiencies up to 4% were achieved. No negative barium ions were observed.
ACCESSION #
9824861

 

Related Articles

  • H[sup -] enhancement process in a multicusp ion source operated with a barium insert structure. Leung, K.N.; van Os, C.F.; Kunkel, W.B. // Applied Physics Letters;4/8/1991, Vol. 58 Issue 14, p1467 

    Describes the H[sup -] enhancement process in a multicusp ion source operated with a barium insert structure. Operation with a barium washer insert at the extraction aperture.

  • The role of cesium-ion bombardment in the formation of negative hydrogen ions on a converter surface. van Os, C. F. A.; Granneman, E. H. A.; van Amersfoort, P. W. // Journal of Applied Physics;6/1/1987, Vol. 61 Issue 11, p5000 

    Presents information on a study which examined the formation of negative hydrogen ions via surface conversion. Methodology of the study; Results and discussion.

  • Hydrogen negative ion source with LaB[sub 6] inserts. Belchenko, Yu. I.; Kuznetsov, G. I.; Grigoryev, E. A. // Review of Scientific Instruments;Feb2000, Vol. 71 Issue 2, p1079 

    Examines hydrogen negative ion production in the gas-discharge with the semiplanotron electrode configuration having cathode inserts. Negative ion production in a pure hydrogen discharge; Negative ion production in a cesiated discharge; Measurement of negative ion yield at the different parts...

  • Enhanced volume production of negative ions in the post discharge of a multicusp hydrogen discharge. Hopkins, M. B.; Bacal, M.; Graham, W. G. // Journal of Applied Physics;8/15/1991, Vol. 70 Issue 4, p2009 

    Presents a study which demonstrated a concept in the production of negative hydrogen ions in a low-pressure multicusp discharge. Experimental setup; Results and discussion; Conclusions.

  • Negative hydrogen ion source development for large helical device neutral beam injector (invited). Takeiri, Y.; Kaneko, O.; Tsumori, K.; Oka, Y.; Osakabe, M.; Ikeda, K.; Asano, E.; Kawamoto, T.; Akiyama, R. // Review of Scientific Instruments;Feb2000, Vol. 71 Issue 2, p1225 

    Examines development of large-scaled hydrogen negative ion source. Negative ion based neutral beam injector in the large helical device fusion machine; Negative ion acceleration; Electron suppression; Beam steering; Measurement of neutralization efficiency.

  • Measurement of grid heat loading in a negative ion source for producing intense H[sup -] ion beams by aperture displacement focusing technique. Takayanagi, T.; Ikehata, T.; Okumura, Y.; Watanabe, K.; Hanada, M.; Amemiya, T. // Review of Scientific Instruments;Oct2001, Vol. 72 Issue 10, p3829 

    Heat loading of acceleration grids has been investigated using a JAERI 400 keV negative hydrogen ion source, which has a three-stage multiaperture accelerator. To investigate the effect of beamlet steering on the heat loading, the apertures in the grounded grid were displaced up to 5 mm. The...

  • Design of accelerator for negative ion beams by computer simulation. Park, T. S.; Lee, W. S.; Be, S. H. // Journal of Applied Physics;8/15/1985, Vol. 58 Issue 4, p1701 

    Describes the computer simulation concerning the acceleration of negative hydrogen ion beams. Method used to compute spatial distribution and ion trajectory in the multiple stage ionizer; Condition used in the computation.

  • Development of an intense negative hydrogen ion source with an external magnetic filter. Takeiri, Y.; Ando, A.; Kaneko, O.; Oka, Y.; Tsumori, K.; Akiyama, R.; Asano, E.; Kawamoto, T.; Kuroda, T.; Tanaka, M.; Kawakami, H. // Review of Scientific Instruments;Mar95, Vol. 66 Issue 3, p2541 

    Describes the development of an intense negative hydrogen ion source with an external magnetic filter produced by a pair of permanent magnet rows located at 35.4 centimeter separation. Generation of a strong cusp magnetic field for improvement of the plasma confinement; Focus on the structure...

  • Negative ion enhancement in caesium-selected hydrogen discharges--a volume or surface effect? Steen, P.G.; Graham, W.G. // Applied Physics Letters;11/1/1999, Vol. 75 Issue 18, p2737 

    Explores whether negative ion enhancement in cesium (Cs)-seeded hydrogen (H) discharges is a volume or surface effect. Surface enhancement mechanisms responsible for the increase of negative ion fraction in the discharge; Reduction of H atom density by Cs seeding.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics