Global to push GA events into
skip to main content

Title: Magnetron cathodes in plasma electrode pockels cells

Magnetron cathodes, which produce high current discharges, form greatly improved plasma electrodes on each side of an electro-optic crystal. The plasma electrode has a low pressure gas region on both sides of the crystal. When the gas is ionized, e.g., by a glow discharge in the low pressure gas, the plasma formed is a good conductor. The gas electrode acts as a highly uniform conducting electrode. Since the plasma is transparent to a high energy laser beam passing through the crystal, the plasma is transparent. A crystal exposed from two sides to such a plasma can be charged up uniformly to any desired voltage. A typical configuration utilizes helium at 50 millitorr operating. pressure and 2 kA discharge current. The magnetron cathode produces a more uniform plasma and allows a reduced operating pressure which leads to lower plasma resistivity and a more uniform charge on the crystal.
Inventors:
 [1]
  1. (Pleasanton, CA)
Issue Date:
OSTI Identifier:
869854
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
Patent Number(s):
US 5410425
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
magnetron; cathodes; plasma; electrode; pockels; cells; produce; current; discharges; form; greatly; improved; electrodes; electro-optic; crystal; pressure; gas; region; ionized; glow; discharge; formed; conductor; highly; uniform; conducting; transparent; energy; laser; beam; passing; exposed; charged; uniformly; desired; voltage; typical; configuration; utilizes; helium; 50; millitorr; operating; ka; cathode; produces; allows; reduced; leads; resistivity; charge; operating pressure; highly uniform; conducting electrode; gas region; discharge current; uniform plasma; beam passing; pressure gas; laser beam; glow discharge; pockels cell; energy laser; plasma formed; plasma electrodes; desired voltage; greatly improved; charge current; cathode produces; plasma electrode; electro-optic crystal; gas electrode; improved plasma; magnetron cathodes; /359/