TITLE

Generation of high-current electron beam in a wide-aperture open discharge

AUTHOR(S)
Bokhan, P. A.; Zakrevsky, Dm. E.; Gugin, P. P.
PUB. DATE
October 2011
SOURCE
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p103112
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In the present study, it was examined generation of nanosecond-duration electron-beam (EB) pulses by a wide-aperture open discharge burning in helium or in a mixture of helium with nitrogen and water vapor. In the experiments, a discharge cell with coaxial electrode geometry, permitting radial injection of the electron beam into operating lasing medium, was used, with the cathode having radius 2.5 cm and length 12 cm. It was shown possible to achieve an efficient generation of a high-intensity electron beam (EB pulse power ∼250 MW and EB pulse energy up to 4 J) in the kiloampere range of discharge currents (up to 26 kA at ∼12 kV discharge voltage). The current-voltage characteristics of the discharge proved to be independent of the working-gas pressure. The existence of an unstable dynamic state of EB, conditioned by the presence of an uncompensated space charge accumulated in the discharge cell due to the exponential growth of the current in time during discharge initiation and the hyperbolic growth of current density in the direction towards the tube axis, was revealed. The obtained pulsed electron beam was used to excite the self-terminated laser on He 21P10-21S0 transition. The oscillations developing in the discharge cell at high discharge currents put limit to the pumping energy and emissive power of the laser excited with the radially converging electron beam.
ACCESSION #
66903290

 

Related Articles

  • Oscillations of a ballistic hole current through uniaxially compressed semiconductor layers. Vagidov, N. Z.; Gribnikov, Z. S.; Korshak, A. N. // Semiconductors;Feb97, Vol. 31 Issue 2, p150 

    The oscillations of the ballistic hole current through a thin base of a p[sub +]pp[sub +] diode compressed uniaxially in the direction of the current are investigated theoretically. As a result of compression, the hole dispersion relation contains sections with negative effective mass along the...

  • Pulsed electron beam generation in a simple discharge device. Rhee, M. J.; Strikovski, M. // Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p1916 

    We report a phenomenon of pulsed electron beam generation in a low-pressure gas discharge device. The cathode of the device is of simple geometry without a hollow cavity that is employed in the transient hollow cathode discharge (THCD) devices. The discharge and beam characteristics are measured...

  • High current density hollow cathode electron beam source. Rocca, J. J.; Szapiro, B.; Verhey, T. // Applied Physics Letters;5/11/1987, Vol. 50 Issue 19, p1334 

    An electron beam with current density greater than 30 A/cm2 and total current of 92 A has been generated in 5 μs pulses by accelerating the electrons from a glow discharge in a narrow gap between two grids. The ratio of the extracted electron beam current to discharge current is approximately...

  • Stabilization of a cold cathode electron beam glow discharge for surface treatment. Mingolo, N.; González, C.R.; Martínez, O. E.; Rocca, J. J. // Journal of Applied Physics;10/15/1997, Vol. 82 Issue 8, p4118 

    Demonstrates the reproducibility of electron beam pulses generated by a high power, cold cathode glow discharge by adding a small continuous keep-alive discharge current. Description of the cold cathode electron gun used in the electron; Improvement in the keep-alive current; Measurement of the...

  • Effects of dust charging associated with an electron beam in the cathode sheath of glow discharges. Wang, De-Zhen; Liu, Jin-Yuan; Ma, Teng-Cai // Physics of Plasmas;Mar2000, Vol. 7 Issue 3 

    The charging of dust particles caused by the thermal electrons, the cold ions, and the electron beam released from a plane cathode, including secondary emission of dust in a collisionless cathode sheath of glow discharges, is investigated with a self-consistent theoretical model. Effects of the...

  • Negative differential conductivity of electrons in electron-beam sustained discharge... Kochetov, I.V.; Napartovich, A.P.; Ye, C.; Lo, D. // Journal of Applied Physics;8/15/1998, Vol. 84 Issue 4, p1863 

    Focuses on a study conduted using simplified kinetic models to investigate the mechanism of negative differential conductivity (NDC) in an electron-beam sustained gas discharge of pure xenon (Xe). Calculation of the drift velocity of electrons in Xe; What model calculations involves; Definition...

  • Collapse and revival of exciton--polariton oscillation in a semiconductor microcavity. Cao, H.; Jiang, S. // Applied Physics Letters;9/15/1997, Vol. 71 Issue 11, p1461 

    Examines the collapse and revival of exciton-polariton oscillation in a semiconductor microcavity. Interaction between the two exciton-polariton modes; Temporal evolution of the microcavity emission; Factors influencing the exciton-polariton oscillation.

  • Physics of self-sustained oscillations in the positive glow corona. Nae Cho, Sung // Physics of Plasmas;Jul2012, Vol. 19 Issue 7, p072113 

    The physics of self-sustained oscillations in the phenomenon of positive glow corona is presented. The dynamics of charged-particle oscillation under static electric field has been briefly outlined; and, the resulting self-sustained current oscillations in the electrodes have been compared with...

  • Emission properties of a plasma cathode based on a glow discharge for generating nanosecond electron beams. Gushenets, V. I.; Koval�, N. N.; Tolkachev, V. S.; Shchanin, P. M. // Technical Physics;Nov99, Vol. 44 Issue 11, p1318 

    The emission properties of a plasma cathode based on a nanosecond pulsed glow discharge with currents of up to 200 A at a pressure of 5 � 10[sup -2] Pa are studied experimentally. Stable ignition and burning of the discharge are ensured if the current in the auxiliary pulsed discharge is...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics