Abstract
The Texas A&M 6.4 GHz electron cyclotron resonance (ECR) ion source uses conventional water-cooled copper coils and a moderate strength neodymium-iron-boron permanent magnet hexapole to obtain magnetic fields close to those used by the Michigan State superconducting SCECR ion source operating in its 6.4 GHz, high B mode. Despite its simple construction, the intensities of high-charge state, medium to heavy ion beams produced by the Texas A&M ECRIS are comparable to those produced by SCECR and to those produced by some other ECR ion sources that operate at much higher microwave frequencies. In this article the Texas A&M ECRIS run parameters, including the shape of the magnetic confinement field, are described and compared with those of SCECR. The possibility of two-frequency microwave heating is also explored.
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