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Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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A device for a high current pulsed electron beam is described. It is useful for exciting atoms or ions for the generation of pulsed lasers.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
68% of the total text.
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Plasma Focus Generated, Foilless E-Beam Diode
A device for a high current pulsed electron beam is described. It is useful
for exciting atoms or ions for the generation of pulsed lasers.
Fig. 1 shows the present device employed to produce a pulsed laser. A
cylindrical tube 10 serves as the positive electrode. The second electrode or
cathode 12 has a pointed top 14 which passes into the tube 10 at the first end 15. The cathode 12 is positioned along the axis of the cylinder 10 and is
separated from the tube by an insulator 16.
A potential difference, typically 5 to 100 kV, between the cathode 12 and
cylindrical tube 10 is maintained by a cylindrical capacitor 18 which is charged by
a DC source 20. The capacitor 18 is directly connected to the tube 10 and
connected to the cathode 14 through a switch 22.
The second end 24 of the tube 10 is closed with a cover 26 transparent to
electromagnetic radiation. A gas inlet 28 is provided to supply gas to the tube,
and a pumping outlet 30 is provided for evacuation.
When the switch 22 is closed, a radial current sheath 32 will be established
(Fig. 2A). Electrical breakdown normally occurs first over the inner surface of
insulator 16. After striking, the radial current sheath sweeps away from the
insulator 16 and produces a low pressure region 34. The sheath finally "pinches-
off", forming a plasma anode 36 (Fig. 2B). An electron beam 40 is launched from
the cathode tip 14 into the anode plasma 36. A major source of driving en...