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Title: Plasma generating device with hairpin-shaped cathode filaments

Abstract

A device for generating a homogeneous ion-electron plasma from which a large ion beam can be extracted. The device utilizes hairpin-shaped filaments lining at least portions of the wall of the chamber which have been rotated 90 degrees from prior known approaches. This provides a very significant result in that the DC current flowing through the filaments produces a small solenoidal magnetic field that impedes the emitted electrons from striking the walls of the chamber, which may be of a cylindrical or rectangular configuration. This improves the efficiency of the ion source and provides additional space for more filaments, while providing a very uniform plasma density profile which is noise-free.

Inventors:
 [1]
  1. (Alamo, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
863292
Patent Number(s):
4140943
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
plasma; generating; device; hairpin-shaped; cathode; filaments; homogeneous; ion-electron; beam; extracted; utilizes; lining; portions; wall; chamber; rotated; 90; degrees; prior; approaches; provides; significant; result; dc; current; flowing; produces; solenoidal; magnetic; field; impedes; emitted; electrons; striking; walls; cylindrical; rectangular; configuration; improves; efficiency; source; additional; space; providing; uniform; density; profile; noise-free; provides additional; density profile; plasma density; uniform plasma; device utilizes; magnetic field; current flow; current flowing; dc current; rectangular configuration; plasma generating; shaped cathode; generating device; emitted electrons; /376/313/315/

Citation Formats

Ehlers, Kenneth W. Plasma generating device with hairpin-shaped cathode filaments. United States: N. p., 1979. Web.
Ehlers, Kenneth W. Plasma generating device with hairpin-shaped cathode filaments. United States.
Ehlers, Kenneth W. Mon . "Plasma generating device with hairpin-shaped cathode filaments". United States. https://www.osti.gov/servlets/purl/863292.
@article{osti_863292,
title = {Plasma generating device with hairpin-shaped cathode filaments},
author = {Ehlers, Kenneth W.},
abstractNote = {A device for generating a homogeneous ion-electron plasma from which a large ion beam can be extracted. The device utilizes hairpin-shaped filaments lining at least portions of the wall of the chamber which have been rotated 90 degrees from prior known approaches. This provides a very significant result in that the DC current flowing through the filaments produces a small solenoidal magnetic field that impedes the emitted electrons from striking the walls of the chamber, which may be of a cylindrical or rectangular configuration. This improves the efficiency of the ion source and provides additional space for more filaments, while providing a very uniform plasma density profile which is noise-free.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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