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Title: Peculiarities Of Sectioned Metal-hydride Hollow Cathode Applying In Penning Discharge

Abstract

Investigations of reflective discharge in hydrogen medium using sectioned hollow cathode are carried out. As constructive elements of the hollow cathode an alloy Zr50V50Hx able to absorb hydrogen reversibly was used. It has been shown that in case of applying of metal-hydride hollow cathode the penetration of plasma in the hollow occurs deeper. The possibility to operate the plasma penetration into the hollow cathode by means of potential variation on its sections was investigated.

Authors:
; ;  [1];  [2]
  1. Kharkov National University, Kurchatov av. 31, 61108, Kharkov (Ukraine)
  2. Institute of Mechanical Engineering Problems of NAS of Ukraine, 61046, Kharkov (Ukraine)
Publication Date:
OSTI Identifier:
20797931
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 812; Journal Issue: 1; Conference: PLASMA 2005: International conference on research and applications of plasmas; 3. German-Polish conference on plasma diagnostics for fusion and applications; 5. French-Polish seminar on thermal plasma in space and laboratory, Opole-Turawa (Poland), 6-9 Sep 2005; Other Information: DOI: 10.1063/1.2168856; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HOLLOW CATHODES; HYDRIDES; HYDROGEN; PENNING DISCHARGES; PLASMA; VANADIUM ALLOYS; ZIRCONIUM ALLOYS

Citation Formats

Borisko, V. N., Lapshin, V. I., Sereda, I. N., and Klochko, Ye. V. Peculiarities Of Sectioned Metal-hydride Hollow Cathode Applying In Penning Discharge. United States: N. p., 2006. Web. doi:10.1063/1.2168856.
Borisko, V. N., Lapshin, V. I., Sereda, I. N., & Klochko, Ye. V. Peculiarities Of Sectioned Metal-hydride Hollow Cathode Applying In Penning Discharge. United States. doi:10.1063/1.2168856.
Borisko, V. N., Lapshin, V. I., Sereda, I. N., and Klochko, Ye. V. Sun . "Peculiarities Of Sectioned Metal-hydride Hollow Cathode Applying In Penning Discharge". United States. doi:10.1063/1.2168856.
@article{osti_20797931,
title = {Peculiarities Of Sectioned Metal-hydride Hollow Cathode Applying In Penning Discharge},
author = {Borisko, V. N. and Lapshin, V. I. and Sereda, I. N. and Klochko, Ye. V.},
abstractNote = {Investigations of reflective discharge in hydrogen medium using sectioned hollow cathode are carried out. As constructive elements of the hollow cathode an alloy Zr50V50Hx able to absorb hydrogen reversibly was used. It has been shown that in case of applying of metal-hydride hollow cathode the penetration of plasma in the hollow occurs deeper. The possibility to operate the plasma penetration into the hollow cathode by means of potential variation on its sections was investigated.},
doi = {10.1063/1.2168856},
journal = {AIP Conference Proceedings},
number = 1,
volume = 812,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}
  • A theoretical model of a glow discharge with a cold hollow cathode is introduced which takes into account the contribution to ionization of the gas from fast secondary electrons formed in the cathode layer. The resulting expression for the volt-ampere characteristic agrees satisfactorily with experiment. Including the formation of fast secondary electrons in the layer makes it possible to explain a well-known specific property of the discharge - the direct proportionality, for a constant cathode potential drop, of the width of the cathode layer to the width of the cathode hollow. 15 references.
  • An ion source based on a hollow-cathode Penning discharge was switched to a high-current pulsed mode (tens of amperes and tens of microseconds) to produce an intense hydrogen ion beam. With molecular hydrogen (H{sub 2}), the ion beam contained three species: H{sup +}, H{sub 2}{sup +}, and H{sub 3}{sup +}. For all experimental conditions, the fraction of H{sub 2}{sup +} ions in the beam was about 10 √∑ 15% of the total ion beam current and varied little with ion source parameters. At the same time, the ratio of H{sup +} and H{sub 3}{sup +} depended strongly on the dischargemore » current, particularly on its distribution in the gap between the hollow and planar cathodes. Increasing the discharge current increased the H{sup +} fraction in ion beam. The maximum fraction of H{sup +} reached 80% of the total ion beam current. Forced redistribution of the discharge current in the cathode gap for increasing the hollow cathode current could greatly increase the H{sub 3}{sup +} fraction in the beam. At optimum parameters, the fraction of H{sub 3}{sup +} ions reached 60% of the total ion beam current.« less
  • Results from experimental studies of an electric discharge operating between a solid anode and an electrolytic cathode in a wide pressure range are presented. Specific features of the discharge ignition and discharge shape and peculiarities the structure of cathode spots on the electrolyte surface and anode spots on the surface of the solid electrode are revealed. The dependences of the current density on the electrolytic cathode and metal anode on the total current are measured, and the spatial distribution of the electric field is determined. A transition of a glow discharge into a multichannel discharge is investigated. The experimental datamore » on the frequency and amplitude of the current and voltage pulsations are presented. Requirements for the maintenance of an electric discharge with an electrolytic cathode are formulated using the obtained experimental results.« less
  • The authors have investigated the operation of a high-voltage segmented hollow cathode discharge which is an efficient pumping source for ultraviolet metal ion lasers. They present the photographically recorded visual appearance of the discharge and the spatial distribution of the ionization source obtained from Monte Carlo simulation of the electrons` motion. Both results show that the high voltage of the segmented hollow cathode discharge and the curved cathode surfaces result in a strong focusing of the fast electrons even at the relatively high operating pressure.
  • The possibility of the analytical use of secondary chemical reactions taking place in the special conditions of the high-temperature discharge in a hollow cathode was shown using as an example the determination of small amounts of fluorine in zirconium metal. A highly sensitive spectrographic method for the determination of fluorine in zirconium metal was developed. (auth)