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AbstractAbstract
[en] The discharge mechanism of this source is based on the use of mixed discharge formed by the use of both RF-driven (15 MHz-300W) and vacuum arc to create discharge plasma of higher intensity. The basic construction of the source is in the form of a cylindrical anode which is immersed in non homogeneous axial magnetic field of 500Gauss measured at the source center. The anode is terminated from its both ends with two cathodes, thus allowing the electrons to be oscillate between the two cathodes. An internal antenna is used to couple the RF power to the plasma through a matching circuit formed from an inductor connected in parallel with capacitor, in order to insure maximum power transfer to the plasma. The oscillating electrons thus absorb energy from both RF and DC fields in the gaps between the cathodes and the anode due to the arc discharge. In order to investigate and optimize the source characteristics, the influence of the discharge pressure, magnetic field, discharge voltage and RF power on the source characteristics have been studied. The source is considered self extracted ion current and could deliver ion currents of ∼10A for thin beam (diameter ∼4mm.) and ∼20 mA for broad beam (diameter ∼6cm.) at ∼200V extraction voltage. The plasma is diagnosed using double Langumier probes. The plasma intensity could reach ∼8x1011 elec./cm3 and the plasma temperature ∼14 eV. Lower ignition voltage (50 up to 200V) and higher plasma intensity feature the characteristics of this source. The beam diagnostics (for thin beam) of this source are measured, which include: the beam profiles, beam emittance, energy spread and distribution of the ion species in the ion beam. The increase of the anode voltage affects decrease of the beam emittance, while the energy spread increases with the decrease of the discharge pressure. The beam emittance is found to be around 200 up to 400 mm.m.rad. and the energy spread of the ions in the ion beam is around 40 up to 80 eV. The source could deliver Argon ion species up to Ar+5. The beam profiles show that the beam is more convergent with the increase of the accelerating voltage and with the use of proper capacitors between the extraction electrodes
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo (Brazil); 185 p; 2001; p. 30-31; International symposium on utilization of accelerators; Sao Paulo (Brazil); 26-30 Nov 2001; IAEA-SM--366/107; 2 refs, 2 figs
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AbstractAbstract
[en] Plasma supply to the extraction region, which is of essential importance in high-current ion sources, is investigated experimentally and theoretically. The theory uses the model that the mechanism of plasma supply is a one-dimensional plasma diffusion, and indicates that the mean free path of ions lambda sub(i) and the electron temperature T sub(e) should be large for the effective supply; as an example, lambda sub(i)√T sub(e) >= 7 cm.eV sup(1/2). The experiments show qualitiative agreement with the theory with regard to the effect of the mean free path of ions on the plasma supply, and indicate that a decrease in plasma density is brought about by beam extraction when the supply is insufficient. The diffusion model used is a simple one, but is thought to be useful for the understanding of ion source performance. (author)
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Journal Article
Journal
Jpn. J. Appl. Phys; ISSN 0021-4922;
; v. 18(11); p. 2127-2132

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Fessenden, T.J.
Lawrence Livermore National Lab., CA (USA)1983
Lawrence Livermore National Lab., CA (USA)1983
AbstractAbstract
[en] Measurements of the normalized emittance of the beam produced by the Advanced Test Accelerator (ATA) injector yielded values near 0.4 Radian-Centimeters at currents up to 10 kAmps. The instrument was also used to obtain beam-current-density profiles in two dimensions at the entrance mask of the instrument
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Source
27 Jun 1983; 18 p; Available from NTIS, PC A02/MF A01 as DE83016522
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AbstractAbstract
No abstract available
Original Title
Trekhehlektrodnaya vysokoperveansnaya ehlektronnaya pushka dlya formirovaniya trubchatogo puchka
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Source
For English translation see the journal Instrum. Exp. Tech.
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Journal Article
Journal
Pribory i Tekhnika Ehksperimenta; (no.5); p. 23-25
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Shamovskij, V.G.
AN SSSR, Novosibirsk (USSR). Inst. Yadernoj Fiziki1988
AN SSSR, Novosibirsk (USSR). Inst. Yadernoj Fiziki1988
AbstractAbstract
[en] Design of a simple ion source with long service life is described. Gaseous discharge in plasma generator burns between anode with outlet and heated cathode, made of tungsten wire, 1.5 mm in diameter. Additional electrode, being at floating potential is used to reduce thermionic cathode destruction in result of cathode sputtering. This electrode, decreasing sufficiently plasma density near thermionic cathode without change of its emission current, reduces ion flux from plasma on thermionic cathode. This results to sharp decrease of its destruction rate under ion bombardment service life tests of the ion source were conducted for argon during 100 h. Any noticeable destructions of structural components, including thermionic cathode, were not revealed after tests
Original Title
Ionnyj istochnik s povyshennym resursom raboty
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1988; 12 p; 6 refs.: 8 figs.
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AbstractAbstract
[en] A description and results of tests of device for automatic extraction of ions from a high-frequency ion source are presented. The automatic regime is realized by introducing feedback with respect to the current of the source cathode and requires low sinusoidal modulation of the exctracting voltage. By varying the power of the discharge the beam current was controlled in the 90-1470μA range with automatic preservation of the optimal conditions in the extraction system. The device was used on a 210-kV neutron generator
Original Title
Avtomaticheskoe vytyagivanie ionov iz vysokochastotnogo ionnogo istochnika
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Source
For English translation see the journal Instrum. Exp. Tech.
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Journal Article
Journal
Pribory i Tekhnika Ehksperimenta; v. 18(4); p. 19-20
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AbstractAbstract
[en] Vacuum arc ion sources provide a convenient tool for the production of intense beams of metal ions. The sources are relatively easy to construct and they can produce beams from all of the solid metals as well as from compounds, alloys, and mixtures. We have made a number of different kinds of such sources over the course of our development work at LBL in the past decade, from very small open-quote open-quote thumb-size close-quote close-quote versions to a very large one with a 50 cm diameter extractor. Beam current ranges from a few milliamperes up to almost 10 A and extraction voltage from about 1 to 100 kV. Multicathode versions have been made so that one can switch between metal ion species simply and quickly. Most of the sources have been operated in a repetitively pulsed mode, and we close-quote ve also tested a dc version. Here we outline some construction features of the array of vacuum arc ion sources that we close-quote ve developed and used, and describe their performance and limitations. copyright 1996 American Institute of Physics
Original Title
AC03-76SF00098
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6. international conference on ion sources; Whistler (Canada); 10-16 Sep 1995; CONF-9509125--
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Proudfoot, Gary
UKAEA Headquarters, London1987
UKAEA Headquarters, London1987
AbstractAbstract
[en] An ion beam source is described which is adapted to provide a plurality of planar ion beams. The centres of the beams are superimposed and their planes are at an angle to the line joining their centres such that the projection of the beams in a direction orthogonal to that joining their centres is continuous. The ion beams are produced by superposed slits in extraction electrodes. The length L, pitch P and angle THETA of the slits are such as to ensure uniform coverage of a target passed through the beams. (author)
Primary Subject
Source
1 Apr 1987; 17 Sep 1985; 3 p; GB PATENT DOCUMENT 2180686/A/; GB PRIORITY 8522976; Available from The Patent Office, 25 Southampton Buildings, London, WC2A 1AY; Priority date: 17 Sep 1985
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Patent
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AbstractAbstract
No abstract available
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Gesellschaft fuer Schwerionenforschung m.b.H., Darmstadt (Germany, F.R.); 354 p; Mar 1981; p. 264; Published in summary form only.
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AbstractAbstract
[en] A sputter source is described in which the beam is extracted through the ionizer. This gives a very compact source with easily changed cones. The beam transmissions through an electrostatic accelerator are good, and life times of in excess of a month between services are normal
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Source
International conference on heavy ion sources; Gatlinburg, TN, USA; 27 Oct 1975
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Journal Article
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Conference
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IEEE Transactions on Nuclear Science; v. NS-23(2); p. 1109-1112
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