@techreport{oai:nifs-repository.repo.nii.ac.jp:00010109,
 author = {"Oka,  Y. and Kaneko,  O. and Tsumori,  K. and Takeiri,  Y. and Osakabe,  M. and Kawamoto,  T. and Asano,  E. and Akiyama,  R."},
 month = {Dec},
 note = {"A new multicusp H^- ion source using a Localized Virtual magnetic filter of type I [Ref.6] in the plasma electrode is investigated.  A multipole (MP) arrangement with a spacing of 10 mm of the magnet bars holds an extraction hole, optimizing the efficient production of high H^- current, and at the same time only a small electron component was co-extracted with the H^- ions.  The local filter arrangement separates the beam electrons at a low energy.  It is shown that the co-extracted total electron current is determined principally by the integrated magnetic field flux (Gcm) of the local filter with an extraction system at a constant extraction voltage.  When the value of the Gcm is increased, the total electron component is reduced, while the H^- electrical efficiency had a braod maximum around the optimized value of the Gcm. A thicker plasma electrode should be necessary for sufficient reduction of electron current.  In pure hydrogen operation, the achieved current density of H^- is 10 mA/cm^2.  when Cs was seeded in a filter optimized for pure volume mode H^- production, the maximum H^-  current density obtained is 51 mA/cm^2 and the ratio I_ele/H^- is ~ 0.4 without applying a bias potential."},
 title = {H-  Ion Source Using a Localized Virtual Magnetic Filter in the Plasma Electrode: Type I LV Magnetic Filter},
 year = {1999}
}