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Production of large resonant plasma volumes in microwave electron cyclotron resonance ion sources

United States Patent

*** EXPIRED ***
November 24, 1998
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Microwave injection methods for enhancing the performance of existing electron cyclotron resonance (ECR) ion sources. The methods are based on the use of high-power diverse frequency microwaves, including variable-frequency, multiple-discrete-frequency, and broadband microwaves. The methods effect large resonant "volume" ECR regions in the ion sources. The creation of these large ECR plasma volumes permits coupling of more microwave power into the plasma, resulting in the heating of a much larger electron population to higher energies, the effect of which is to produce higher charge state distributions and much higher intensities within a particular charge state than possible in present ECR ion sources.
Alton; Gerald D. (Kingston, TN)
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
08/ 892,492
July 14, 1997
The United States Government has rights in this invention pursuant to contract no. DE-AC05-960R22464 between the United States Department of Energy and Lockheed Martin Energy Research Corporation.