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  • Title: Generation of high charge state metal ion beams by electron cyclotron resonance heating of vacuum arc plasma in cusp trap.
    Author: Nikolaev AG, Savkin KP, Oks EM, Vizir AV, Yushkov GY, Vodopyanov AV, Izotov IV, Mansfeld DA.
    Journal: Rev Sci Instrum; 2012 Feb; 83(2):02A309. PubMed ID: 22380156.
    Abstract:
    A method for generating high charge state heavy metal ion beams based on high power microwave heating of vacuum arc plasma confined in a magnetic trap under electron cyclotron resonance conditions has been developed. A feature of the work described here is the use of a cusp magnetic field with inherent "minimum-B" structure as the confinement geometry, as opposed to a simple mirror device as we have reported on previously. The cusp configuration has been successfully used for microwave heating of gas discharge plasma and extraction from the plasma of highly charged, high current, gaseous ion beams. Now we use the trap for heavy metal ion beam generation. Two different approaches were used for injecting the vacuum arc metal plasma into the trap--axial injection from a miniature arc source located on-axis near the microwave window, and radial injection from sources mounted radially at the midplane of the trap. Here, we describe preliminary results of heating vacuum arc plasma in a cusp magnetic trap by pulsed (400 μs) high power (up to 100 kW) microwave radiation at 37.5 GHz for the generation of highly charged heavy metal ion beams.
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