Plasma characterization in a diode with a carbon-fiber cathode

Vekselman, V.; Gleizer, J.; Yarmolich, D.; Felsteiner, J.; Krasik, Ya.; Liu, L.; Bernshtam, V.
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p081503
Academic Journal
Results of optical and spectroscopic studies of the plasma formation at the surface of two types of carbon-fiber cathodes in a diode powered by an ∼200 kV accelerating pulse are presented. It was found that during the pulse, generation of the plasma occurs in a form of several millimeter size plasma spots. In the vicinity of the cathode surface the average plasma density and temperature were found to be ∼3×1014 cm-3 and ∼5 eV, respectively, for an electron current density of ∼22 A/cm2. The plasma expansion velocity toward the anode was found to be ∼1.5×106 cm/s during the first 150 ns of the accelerating pulse duration.


Related Articles

  • Electron beam generation in a diode with a gaseous plasma electron source I: Plasma source based on a hollow anode ignited by a multi-arc system. Krokhmal, A.; Gleizer, J. Z.; Krasik, Ya. E.; Felsteiner, J.; Gushenets, V. I. // Journal of Applied Physics;7/1/2003, Vol. 94 Issue 1, p44 

    We report on the operation of an electron diode with a cathode based on a hollow plasma anode (HPA) design. Six arc sources placed inside the anode cavity were used to produce a preliminary plasma. The latter was used to produce a high-current (up to 4 kA) gaseous discharge without formation of...

  • Production and acceleration of pulsed kiloampere currents of H- and subkiloampere currents of C-, F-, I-, and Pb- ions. Mozgovoy, A. G.; Papadichev, V. A. // Review of Scientific Instruments;Apr94, Vol. 65 Issue 4, p1234 

    Experiments on acceleration of various negative ions in a high-power coaxial diode with magnetic insulation are described. Various methods of initiating cathode plasma for H[sup -] production were tried: surface discharge of a dielectric by the prepulse in two cathode configurations and laser...

  • Electron beam generation in a diode with different ferroelectric cathodes. Krasik, Ya. E.; Chirko, K.; Sayapin, A.; Gleizer, J.; Krokhmal, A.; Felsteiner, J. // Journal of Applied Physics;10/15/2003, Vol. 94 Issue 8, p5158 

    We present experimental results of electron beam generation in a diode with cathodes made of BaTi solid solution and prepoled and unpoled PZT ferroelectrics without a screening grid in front of them. The diode operates with an accelerating pulse of ∼200 kV and ∼300 ns duration. It was...

  • A source of gas, vapor, metal, and carbon ions based on a low-pressure hollow-cathode discharge. Semenov, A. P.; Semenova, I. A. // Instruments & Experimental Techniques;May2010, Vol. 53 Issue 3, p449 

    A compact source of gas, vapor, metal, and carbon ions based on a cold-hollow-cathode reflective discharge has been developed, in which a 6-mm-diameter flat target (Cu, Mo, W, C) is installed on the bottom of the cold cathode insulated from it. The density of the ion flow from cathode plasma...

  • Electronmagnetohydrodynamic response of a plasma to an external current pulse. Zhou, H. B.; Papadopoulos, K.; Sharma, A. S.; Chang, C. L. // Physics of Plasmas;May96, Vol. 3 Issue 5, p1484 

    Examines the dynamic response of a magnetoplasma to an external time-dependent current pulse source in the context of electronmagnetohydrodynamics. Analytic solution to the set of cold electron plasma and Maxwell's equations; Transformation of the radiation fields and plasma currents; Response...

  • Hydrodynamic characteristics of pulsed processes in a compressible medium with a multiple (pulsating) energy deposition law. Krutikov, V. S.; Lopatnev, A. G. // Technical Physics Letters;Jul99, Vol. 25 Issue 7, p564 

    The inverse problem of reconstructing the pressure at the moving boundary of a cylindrical plasma piston from the pulsating pressure at a point in the wave zone is solved for the first time. The law of motion of the plasma piston was unknown and needed to be determined. Kinematic and dynamic...

  • Electric-field enhancement and ion-flow focusing at the multiwire cathode of a high-current plasma-filled diode. Nefyodtsev, E.; Ozur, G. // Plasma Physics Reports;Aug2008, Vol. 34 Issue 8, p650 

    The time evolution of an unsteady ion sheath in the presence of cylindrical protrusions at the cathode is studied numerically in a two-dimensional model. The calculations demonstrate the enhancement of the electric field and the focusing of the ion flow at the protrusion vertices. It is shown...

  • Modeling the Formation of a Deep Potential Well in a Vacuum Diode. Barengol'ts, S. A.; Kazarinov, N. Yu.; Mesyats, G. A.; Perel'shte&icaron;n, �.A.; Shevtsov, V. F. // Technical Physics Letters;Feb2005, Vol. 31 Issue 2, p164 

    The formation of a deep nonstationary potential well in the gap between the cathode flare front and the anode has been modeled with allowance for a floating potential at the boundary of an expanding plasma. It is shown that a long-lived potential well with a lifetime on the order of nanoseconds...

  • Shot to shot variation in perveance of the explosive emission electron beam diode. Roy, Amitava; Menon, R.; Singh, S. K.; Kulkarni, M. R.; Saroj, P. C.; Nagesh, K. V.; Mittal, K. C.; Chakravarthy, D. P. // Physics of Plasmas;Mar2009, Vol. 16 Issue 3, p033113 

    The shot to shot variation in perveance of a planar diode with explosive emission graphite cathode in a range of accelerating gaps 3–12 mm is investigated experimentally. The typical electron beam parameters were 200 kV, 12 kA, 100 ns, with a few hundreds of A/cm2 current density. The...


Read the Article


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

Try another library?
Sign out of this library

Other Topics