Abstract
The latest developments in superconducting electron cyclotron resonance ion sources (ECRIS), and in particular their capability to vary the hexapole field, have highlighted the importance of optimizing the magnetic field configuration for maximum beam production. With the presently accepted set of magnetic scaling rules serving as a guide, several aspects of the magnetic structure of the Argonne National Laboratory 14 GHz ECRIS (ECR2) have been upgraded. The injection region iron has been modified raising the peak injection side field from 1.7 to 2.0 T. In conjunction with the iron upgrade, the previously damaged hexapole has been replaced with a new permanent magnet hexapole constructed of higher-grade material. This has raised the wall field from 0.80 to 0.95 T. Thus, 250 e μA of Kr14+ and 7.0 e μA of Kr25+ have been measured. Results with lead include 102 e μA of Pb24+ and 6.4 e μA of Pb37+. Uranium has been produced using the sputter method resulting in 39 e μA of U26+, 30 e μA of U29+, and 1.1 e μA of U43+. These results in general represent a factor of 2 improvement over the preupgrade beam intensities.
Published Version
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