BrowseConferences >Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum
Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum
Volume 2 -1996
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Show MoreVacuum arc ion sources with gaseous plasma trigger systems
A.G. Nikolaev;G.Y. Yushkov;E.M. Oks;I.G. Brown;R.A. MacGill;M.R. Dickinson
Publication Year: 1996,Page(s):562 - 565 vol.2
Cited by: Papers (2)
Triggering systems for vacuum arc plasma sources and ion sources have been developed that make use of a gaseous trigger discharge in a strong magnetic field. Two kinds of trigger discharge configurations have been explored, a Penning discharge and a magnetron discharge. The approach works reliably for low gas pressure in the vacuum arc environment and for long periods of operation between required...Show More
Intense ion beam on the quasibrillouin orbit in the magnetic field
Publication Year: 1996,Page(s):566 - 569 vol.2
The possibility of introduction of the ampere-scale intense ion beam onto the longitudinal magnetic field quasibrillouin orbit is investigated both experimentally and theoretically. It is shown that under space charge control compensation of a repetitively pulsed ion beam by secondary ion-electron emission electrons, the optimum conditions for effective transporting of a beam on the equilibrium or...Show More
High-current plasma lens: role of aberrations
A. Goncharov;A. Dobrovolsky;I. Litovko;I. Protsenko;V. Zadorodzny
Publication Year: 1996,Page(s):570 - 573 vol.2
Cited by: Papers (2)
Influence of spherical and momentum aberrations of the electrostatic plasma lens (PL) on the focusing character of the intense ion beam on the target is analyzed. The beam form of a focused beam depending on the noncompensated space charge and finite azimuthal velocity at the PL exit is found. The minimum focused beam radii are calculated for different system parameters. These radii are shown to d...Show More
New approach to the theoretical modeling of applied-B ion diodes
Publication Year: 1996,Page(s):574 - 578 vol.2
The one-dimensional hydrodynamic electron fluid model in applied-B ion diodes is investigated. For the relativistic potential the electron inertia effect is considered, when the magnetic Debye length is of the order of the collisionless electron skin depth. By the account of the electron inertia an analytical relation between the magnetic field and the electric potential is discovered that essenti...Show More
Sources of pulsed low-energy electron beams and soft X-rays based on liquid-metal explosive-emission cathodes
Publication Year: 1996,Page(s):579 - 583 vol.2
Cited by: Papers (3)
The paper describes a pulsed electron beam source with a liquid-metal cathode operating in the explosive electron emission mode. The operating voltage range of the source is 10-40 kV. The operating frequency of the cathode is up to 1500 Hz. The device can be used as a point electron source in various electronic tubes and as an element of a multiemitter electron source producing a large-cross-secti...Show More
Some features of vacuum arc plasmas with increasing gas pressure in the discharge gap
Publication Year: 1996,Page(s):584 - 588 vol.2
Cited by: Papers (10)
The application of a magnetic field to the discharge gap of a vacuum arc increases the average charge of the ion flow and, with an elevated gas pressure (10/sup -5/-10/sup -4/ Torr), to the appearance of gas ions in the discharge plasma. The paper presents the results of an experimental investigation into the charge composition of the vacuum arc plasma. A probable physical mechanism for the above ...Show More
Broad beam ion implanter with the use of radio frequency ion source
Publication Year: 1996,Page(s):589 - 593 vol.2
Cited by: Papers (1)
The project starts with the design of the broad beam RF ion source and the single gap accelerating column. The preliminary results of the source show that the ion current extracted from the source could reach /spl sime/30 mA with extraction voltage /spl sime/2 kV. The beam uniformity is achieved by the use of a multiaperture graphite cathode designed to make perveance matching to the normal Gaussi...Show More
A pulsed large area intense ion beam source is described, in which the ion emitting plasma is built up by an array of individual discharge units, homogeneously distributed over the surface of a common discharge electrode. A particularly advantageous feature of the source is that for plasma generation and subsequent acceleration of the ions only one common energy supply is necessary. This allows to...Show More
High-voltage electrical discharges and insulation in vacuum at the minimising volumes
Publication Year: 1996,Page(s):599 - 602 vol.2
Cited by: Papers (4)
The essential part of this arrangement is a source of artificial gamma radiation. A principal advantage of this kind of source in applications for gamma logging is the possibility of remote handling, thus excluding the danger in case of an accident. The evaluation of the generator has been performed for the most difficult application case-a deep borehole with high temperature and pressure. Several...Show More
Nitrogen plasma immersion ion implantation of metals with a 2.45 GHz microwave source
Publication Year: 1996,Page(s):603 - 606 vol.2
Cited by: Papers (1)
Results on Plasma Immersion Ion Implantation (Pill) of nitrogen ions into a metal surface using microwave plasma source are described. Preliminary results in our benchtop PIII system with microwave source showed successful N/sup +/ implantation in an Al sample but indicated the necessity of better plasma optimization and confirmed a need for a high repetition rate, negative high voltage pulser whi...Show More
High-current ion beam acceleration and stability in two accelerating cusps of induction linac
Publication Year: 1996,Page(s):607 - 611 vol.2
Results of the 2.5-dimensional numerical simulation of the hollow high-current ion beam (HHCIB) dynamics in two magnet-isolated accelerating gaps separated by the drift gap are presented. The previous study has shown that the good charge and current compensations of the ion beam by the specially injected in accelerating gap electron beam and the thermal electron injection into drift gap of the ind...Show More
Beam-plasma discharge in RF-devices at low and high power levels
Publication Year: 1996,Page(s):612 - 616 vol.2
The development of beam-plasma discharges in HF generators, which is accompanied by efficiency enhancement due to plasma presence together with the undesirable effect of electron gun cathode destruction, is investigated. Plasma production processes during beam-plasma discharge in HF-devices at low (about 100 W of beam power) and high (above 100 kW of beam power) power levels are considered.Show More
Non-linear self-acceleration of electrons emitted by plasma cathode
Publication Year: 1996,Page(s):617 - 619 vol.2
Electron self-acceleration takes place in a cathode-anode interval during electron emission from a metal cathode. This effect provides the appearance of the corresponding additional source of current in the equivalent electrical circuit of the diode. It is interesting to ascertain as this effect is modified in case of electron emission from a plasma cathode. This problem is investigated in the pre...Show More
Hot dense matter generated by high-power light ion beams
V.E. Fortov;G.I. Kanel;A.V. Utkin;O.Y. Vorobiev;G. Kessler;H.U. Karow;K. Baumung;G. Goel;V. Light
Publication Year: 1996,Page(s):620 - 624 vol.2
Response of plane targets to the action of intense proton beam (KALIF) has been investigated using time-resolved 1D and 2D laser Doppler velocimeter ORVIS with sub-nanosecond temporal resolution. A new method for shock compressibility (Hugoniot) measurements with micron-thick impactor and transparent barriers has been used. Results of experimental measurements of velocity histories have been compa...Show More
Vacuum-spark metal ion source based on a modified Marx generator
Publication Year: 1996,Page(s):625 - 629 vol.2
The plasma generating parts of ion sources including their power supplies are usually floated to high potential (ion extraction voltage), thus requiring great insulation efforts and high costs for high-energy ion beams. A new concept for pulsed ion sources is presented in which a single power supply is used to simultaneously produce the plasma and high extractor voltage via a modified Marx generat...Show More
Investigation into the formation and transportation of a relativistic high-current electron beam in a permanent-magnet-based focusing system
Publication Year: 1996,Page(s):630 - 634 vol.2
Cited by: Papers (1)
The paper presents the results of an experimental study aimed at developing specialized focusing systems based on permanent magnets. These magnets creating a quasi-solenoidal-type field are necessary to form and transport nanosecond, high-current electron beams with energies of a few hundreds of kiloelectronvolts and currents of up to a kiloampere. Preliminary testing results for a pulsed backward...Show More
An experimental study of the formation and the dynamics of transportation of a magnetically insulated high-current subnanosecond tubular electron beam
Publication Year: 1996,Page(s):635 - 639 vol.2
Cited by: Papers (11)
A compact subnanosecond accelerator producing an annular electron beam of duration up to 300-400 ps, energy /spl sim/250 keV, and current up to 1 kA has been developed to study experimentally the transient processes in high-pulsed-power, high-current microwave devices. The dynamics of the beam current pulse and the variation of the electron energy during the transportation of the beam in a longitu...Show More
Plasma wakefield diagnostics using probe electron beam and microchannel plates
Y.B. Fainberg;V.A. Balakirev;A.K. Berezin;V.I. Karas;V.A. Kiselev;I.N. Onishchenko;A.P. Tolstoluzhsky
Publication Year: 1996,Page(s):640 - 643 vol.2
The analytical and numerical investigations of trajectories of the probe beam electrons in the two dimensional wakefield, excited in plasma by a dense bunch of relativistic electrons with Gauss longitudinal and transverse distribution of density is carried out. On the basis of calculations of probe beam deviations, the diagnostic instrument is developed for parameters of experiments conducted in N...Show More
Vacuum arc technique TAMEK: broad metal ion, plasma and electron beams generation
Publication Year: 1996,Page(s):644 - 648 vol.2
This paper presents a review of vacuum arc facilities to be as injectors for metal ion accelerators. A vacuum arc in different modes: (1) arc current I/sub arc/=2-50 A, pulse duration t/sub p/=10 /spl mu/s to 20 ms; (2) I/sub arc/=20-100 A, t/sub p/=50-1000 /spl mu/s; (3) I/sub arc/=100-2000 A, t/sub p/=100-2000 /spl mu/s; and (4) I/sub arc/=10-100 kA, t/sub p/=1-10 /spl mu/s were investigated as ...Show More
The role of anode and cathode plasmas in high power ion diode performance
T.A. Mehlhorn;J.E. Bailey;M.A. Bernard;A. Carlson;M.E. Cuneo;M.P. Desjarlais;A.B. Filuk;W.E. Fowler;D.L. Hanson;D.J. Johnson;P. Lake;T.R. Lockner;Y. Maron;P.R. Menge;T.D. Pointon;S.A. Slutz;M.A. Stark;R.A. Vesey;D.R. Welch
Publication Year: 1996,Page(s):649 - 653 vol.2
Cited by: Papers (3)
We describe measurements, modeling, and mitigation experiments on the effects of anode and cathode plasmas in applied-B ion diodes. We have performed experiments with electrode conditioning and cleaning techniques including RF discharges, anode heating, cryogenic cathode cooling and anode surface coatings that have been successful in mitigating some of the effects of electrode contamination on ion...Show More
Discharge characteristics of the spherical inertial electrostatic confinement (IEC) device
G.H. Miley;Y. Gu;J.M. DeMora;R.A. Stubbers;T.A. Hochberg;J.H. Nadler;R.A. Anderl
Publication Year: 1996,Page(s):654 - 658 vol.2
Cited by: Papers (2)
The inertial electrostatic confinement (IEC) device provides 10/sup 7/ 2.5-MeV D-D neutrons/second, when operated with a deuterium discharge at 70 kV. This potentially provides an important portable neutron source for various activation analysis applications. The discharge involved is unique, in that it uses a spherical grid in a spherical vacuum vessel. The discharge is struck between the grid an...Show More
An objective of the present paper is to perform a comparative analysis of the operation of large-scale ion optics in sources based on glow and arc discharges. It is known that the generation of uniform plasma is quite possible and easier to achieve in sources based on hollow cathode glow discharges, this promoting the attainment of broad ion beams. However, results of performed analysis show, that...Show More
Engineering high voltage in the space vacuum
Publication Year: 1996,Page(s):663 - 667 vol.2
Cited by: Papers (4)
The interest in the use of high voltage in electrical power systems has grown significantly. Applications include space exploration and utilization, defense, and communication technologies. Voltages up to 100's of kilovolts have been proposed, using the space vacuum as insulation. Numerous research efforts, both experimental and modeling have furthered our knowledge of how to engineer electrical p...Show More
Electromagnetic radiation generated by arcing in low density plasma
Publication Year: 1996,Page(s):668 - 672 vol.2
Cited by: Papers (8)
This report describes the results of an experimental study and computer simulation of the electromagnetic radiation generated by arcing in low density plasma. A large set of high quality data was obtained during the Solar Array Module Plasma Interaction Experiment (SAMPIE, flight STS-62) and ground test. These data include the amplitudes of current, pulse forms, duration of each arc, and spectra o...Show More
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