An investigation of the properties of the plasma and the electron beam produced by velvet cathodes in a diode powered by a , pulse is presented. Spectroscopic measurements demonstrated that the source of the electrons is surface plasma with electron density and temperature of and , respectively, for an electron current density of . At the beginning of the accelerating pulse, the plasma expands at a velocity of towards the anode for a few millimeters, where its stoppage occurs. It was shown by optical and x-ray diagnostics that in spite of the individual character and nonuniform cross-sectional distribution of the cathode plasma sources, the uniformity of the extracted electron beam is satisfactory. A mechanism controlling the electron current-density cross-sectional uniformity is suggested. This mechanism is based on a fast radial plasma expansion towards the center due to a magnetic-field radial gradient. Finally, it was shown that the interaction of the electron beam with the stainless-steel anode does not lead to the formation of an anode plasma.
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1 November 2005
Research Article|
November 15 2005
Characterization of the plasma on dielectric fiber (velvet) cathodes Available to Purchase
Ya. E. Krasik;
Ya. E. Krasik
a)
Physics Department,
Technion
, 32000 Haifa, Israel
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J. Z. Gleizer;
J. Z. Gleizer
Physics Department,
Technion
, 32000 Haifa, Israel
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D. Yarmolich;
D. Yarmolich
Physics Department,
Technion
, 32000 Haifa, Israel
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A. Krokhmal;
A. Krokhmal
Physics Department,
Technion
, 32000 Haifa, Israel
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V. Ts. Gurovich;
V. Ts. Gurovich
Physics Department,
Technion
, 32000 Haifa, Israel
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S. Efimov;
S. Efimov
Physics Department,
Technion
, 32000 Haifa, Israel
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J. Felsteiner;
J. Felsteiner
Physics Department,
Technion
, 32000 Haifa, Israel
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V. Bernshtam;
V. Bernshtam
Physics Department,
Weizmann Institute of Science
, 76100 Rehovot, Israel
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Yu. M. Saveliev
Yu. M. Saveliev
Physics Department,
University of Strathclyde
, Glasgow G4 0NG, United Kingdom
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Ya. E. Krasik
a)
Physics Department,
Technion
, 32000 Haifa, Israel
J. Z. Gleizer
Physics Department,
Technion
, 32000 Haifa, Israel
D. Yarmolich
Physics Department,
Technion
, 32000 Haifa, Israel
A. Krokhmal
Physics Department,
Technion
, 32000 Haifa, Israel
V. Ts. Gurovich
Physics Department,
Technion
, 32000 Haifa, Israel
S. Efimov
Physics Department,
Technion
, 32000 Haifa, Israel
J. Felsteiner
Physics Department,
Technion
, 32000 Haifa, Israel
V. Bernshtam
Physics Department,
Weizmann Institute of Science
, 76100 Rehovot, Israel
Yu. M. Saveliev
Physics Department,
University of Strathclyde
, Glasgow G4 0NG, United Kingdoma)
Electronic mail: [email protected]
J. Appl. Phys. 98, 093308 (2005)
Article history
Received:
March 30 2005
Accepted:
September 26 2005
Citation
Ya. E. Krasik, J. Z. Gleizer, D. Yarmolich, A. Krokhmal, V. Ts. Gurovich, S. Efimov, J. Felsteiner, V. Bernshtam, Yu. M. Saveliev; Characterization of the plasma on dielectric fiber (velvet) cathodes. J. Appl. Phys. 1 November 2005; 98 (9): 093308. https://doi.org/10.1063/1.2126788
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