title: Multi-slit triode ion optical system with ballistic beam focusing.
abstract: Multi-slit triode ion-optical systems with spherical electrodes are of interest for formation of intense focused neutral beams for plasma heating. At present, two versions of focusing multi-slit triode ion optical system are developed. The first ion optical system forms the proton beam with 15 keV energy, 140 A current, and 30 ms duration. The second ion optical system is intended for heating neutral beam injector of Tokamak Configuration Variable (TCV). The injector produces focused deuterium neutral beam with 35 keV energy, 1 MW power, and 2 s duration. In the later case, the angular beam divergence of the neutral beam is 20-22 mrad in the direction across the slits of the ion optical system and 12 mrad in the direction along the slits.
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: V
authors.initials: V
authors.lastname: Davydenko
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: V
authors.initials: V
authors.lastname: Amirov
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Gorbovsky
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: P
authors.initials: P
authors.lastname: Deichuli
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Ivanov
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Kolmogorov
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: V
authors.initials: V
authors.lastname: Kapitonov
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: V
authors.initials: V
authors.lastname: Mishagin
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: I
authors.initials: I
authors.lastname: Shikhovtsev
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Sorokin
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: N
authors.initials: N
authors.lastname: Stupishin
authors.affiliation: Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CRPP), CH-1015 Lausanne, Switzerland.
authors.forename: A N
authors.initials: AN
authors.lastname: Karpushov
authors.affiliation: Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA.
authors.forename: A
authors.initials: A
authors.lastname: Smirnov
authors.affiliation: Institute of Energy and Climate Research-Plasma Physics, Research Center Juelich, 52425 Juelich, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Uhlemann