Results 271 to 280 of about 333,485 (307)

Reversal ion source: A new source of negative ion beams

Review of Scientific Instruments, 1985
We demonstrate a new type of ion source for producing either pulsed or continuous negative ion beams. The source, dubbed the ‘‘reversal ion source,’’ utilizes an electrostatic ‘‘mirror’’ which reverses trajectories in an electron beam, producing electrons at their turning point having a distribution of velocities centered at zero velocity.
O. J. Orient, A. Chutjian, S. H. Alajajian   +2 more
openaire   +1 more source

Extraction of negative ions with DuoPIGatron ion source

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2007
Abstract A DuoPIGatron ion source, originally designed for positive ion generation, has been modified for H − extraction. To use as high current H − ion source, the extracted high-current electron beams together with the H − ions should be dumped and the H − ion density should be enriched.
Bum-Sik Park, Jae-Sang Lee, Kye-Ryung Kim, Byung-Ho Choi   +3 more
openaire   +1 more source

Negative ion production with the electrospray ion source

The Journal of Physical Chemistry, 1984
Solution passed through a small capillary tube at several kilovolts relative to its surroundings is electrosprayed into a bath gas at slightly above atmospheric pressure to form a dispersion of ions that expands into vacuum through a small sonic orifice.
Masamichi Yamashita, John B. Fenn
openaire   +1 more source

Ion Source for Low-Energy Negative Ions

Review of Scientific Instruments, 1962
A negative ion source is described which is capable of producing negative ion beams of moderate intensity, but with relatively narrow spread in ion energy. The source consists essentially of a jet of gas intersected by an electron beam. The pressure in the vicinity of the thermionic electron source is kept low by differential pumping.
E. E. Muschlitz, H. D. Randolph, J. N. Ratti   +2 more
openaire   +1 more source

A simple ion source for production of negative ions

Measurement Science and Technology, 1999
We describe modification of the DANFYSIK 911A positive ion source for production of negative ions. The modification is simple and the new source is easy to maintain. For H- a beam current of 10 nA was achieved; this is sufficiently large for application of the ion source in atomic collision experiments.
P Nábrádi, L Sarkadi, F Penent, L Víkor   +3 more
openaire   +1 more source

Negative Ion Confinement in the Multicusp Ion Source

Journal of Fusion Energy, 2009
To optimize the negative ion source and generate intense beams of negative ions, understanding of transport properties of both electrons and negative ions is indispensable. Transport process of negative hydrogen ions (H−) in a multicusp H− source, has been simulated by three-dimensional Femlab simulation software. Multipolar plasma confinement is known
Fatemeh Khodadadi Azadboni, Mahmood Sedaghatizade   +1 more
openaire   +1 more source

Particle modelling of the hybrid negative ion source

Plasma Sources Science and Technology, 2011
In this paper we present results of different particle-based models of expansion and extraction regions for the ITER negative ion source. Results show the important role of electron-induced processes (eV excitation and dissociation) and gas-surface and plasma-surface interactions (atom recombinative desorption and ion neutralization) for the production
F Taccogna, P Minelli, P Diomede, S Longo, M Capitelli, R Schneider   +5 more
openaire   +2 more sources

Installation of a versatile multiaperture negative ion source

Review of Scientific Instruments, 2013
Neutral Beam Injectors (NBI), which need to be strongly optimized in the perspective of DEMO reactor, request a thorough understanding of the negative ion source used and of the multi-beamlet optics. A relatively compact RF ion source, named NIO1 (Negative Ion Optimization 1), with 9 beam apertures for a total H− current of 130 mA, 60 kV acceleration ...
Cavenago M., Serianni G., Antoni V., Barbisan M., Bigi M., De Muri M., Fagotti E., Fellin F., Kulevoy T., Minarello A., Pasqualotto R., Petrenko S., Poggi M., Recchia M., Rossetto F., Sattin M., Valente M., Veltri P.   +17 more
openaire   +3 more sources

Cross Section Data for Negative Ion Sources

AIP Conference Proceedings, 2007
We present here some recent advances in the field of atom‐molecule and electron‐molecule collisions involving hydrogen and its isotopes. For the first topic the possibility of exploiting our large and complete hydrogen database by a suited scaling law is explored with the purpose of obtaining databases of hydrogen isotopes.
Capitelli M, Celiberto R, Esposito F, Laricchiuta A   +3 more
openaire   +3 more sources

Design of a versatile multiaperture negative ion source

Review of Scientific Instruments, 2010
Negative ion sources are a key component of the neutral beam injector to be installed in the International Thermonuclear Experimental Reactor. At present research and development activities address several important issues related to beam extraction, optics, and optimization.
Cavenago M, Kulevoy T, Petrenko S, Antoni V, Bigi M, Gazza E, Recchia M, Serianni G, Veltri P   +8 more
openaire   +3 more sources