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Title: Optimized ECR plasma apparatus with varied microwave window thickness

The present invention describes a technique to control the radial profile of microwave power in an ECR plasma discharge. In order to provide for a uniform plasma density to a specimen, uniform energy absorption by the plasma is desired. By controlling the radial profile of the microwave power transmitted through the microwave window of a reactor, the profile of the transmitted energy to the plasma can be controlled in order to have uniform energy absorption by the plasma. An advantage of controlling the profile using the window transmission characteristics is that variations to the radial profile of microwave power can be made without changing the microwave coupler or reactor design.
Inventors:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
870156
Assignee:
Sematech, Inc. (Austin, TX) ORNL
Patent Number(s):
US 5466991
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
optimized; ecr; plasma; apparatus; varied; microwave; window; thickness; describes; technique; control; radial; profile; power; discharge; provide; uniform; density; specimen; energy; absorption; desired; controlling; transmitted; reactor; controlled; advantage; transmission; characteristics; variations; changing; coupler; design; reactor design; radial profile; plasma density; ecr plasma; microwave window; transmission characteristics; uniform energy; uniform plasma; plasma discharge; energy absorption; microwave power; wave coupler; power transmitted; microwave coupler; plasma apparatus; /315/118/