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Leitner, D.

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TUPAS044 Design of a High Temperature Oven for an ECR Source for the Production of Uranium Ion Beams 1742
  • T. J. Loew, S. R. Abbott, M. L. Galloway, D. Leitner, C. M. Lyneis
    LBNL, Berkeley, California
  VENUS is the superconducting electron cyclotron resonance (ECR) ion source at the Lawrence Berkeley National Lab's 88-Inch Cyclotron. To generate neutral atoms for ionization, the source utilizes a resistively-heated high temperature oven that is located in a magnetic field of up to 4 Tesla and operates at temperatures up to about 2000°C. However, temperatures between 2100-2300°C are required to produce the desired 280eμA of high charge state uranium ion beams, and increased thermal and structural effects, combined with elevated chemical reactivity significantly reduce the oven's ability to operate in this envelope. The oven has been redesigned with higher thermal efficiency, improved structural strength and chemically compatible species in order to produce the desired high intensity, high charge state uranium beams. Aspects of the engineering development are presented.  
FROBAB01 Simulation-driven Optimization of Heavy-ion Production in ECR Sources 3786
  • P. Messmer, D. L. Bruhwiler, D. W. Fillmore, P. J. Mullowney, K. Paul, A. V. Sobol
    Tech-X, Boulder, Colorado
  • D. Leitner, D. S. Todd
    LBNL, Berkeley, California
  Funding: Work supported by the U. S. DOE Office of Science, Office of Nuclear Physics, under grant DE-FG02-05ER84173.

Next-generation heavy-ion beam accelerators require a great variety of high charge state ion beams (from protons to uranium) with up to an order of magnitude higher intensity than demonstrated with conventional Electron Cyclotron Resonance (ECR) ion sources. Optimization of the ion beam production for each element is therefore required. Efficient loading of the material into the ECR plasma is one of the key elements for optimizing the ion beam production. High-fidelity simulations provide a means to understanding where along the interior walls the uncaptured metal atoms are deposited and, hence, how to optimize loading of the metal into the ECR plasma. We are currently extending the plasma simulation framework VORPAL with models to investigate effective loading of heavy metals into ECR ion sources via alternate mechanisms, including vapor loading, ion sputtering and laser ablation. Here we will present the models, simulation results of vapor loading and initial comparisons with experiments at the VENUS source at LBNL.

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