ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
ECR-heated plasmas as produced by microwave discharges in magnetic fields are now routinely utilized for production of intense singly and multiply charged ion beams. Such ECR ion sources ("ECRIS'') can be operated during extended lifetimes even with reactive working gases. Our requirement for a simple, long-lived, high current Li+ ion source for Li-CXS tokamak plasma diagnostics led to a study on plasma production with a coaxial 2.45 GHz microwave discharge (23 mm outer diameter) embedded in a variable magnetic field configuration. The chosen geometry is compatible with Li vapor production from heat pipe ovens or externally heated LiAl alloy liners, and also permits incorporation of a permanent magnet quadrupole structure for enhancing the ion confinement in the discharge region. As a first step, with a simple magnetic mirror field generated by two axially adjustable solenoids the microwave discharge properties and extractable ion beam currents have been investigated with H2, He, and Ar as feeding gases.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1142879
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