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Lietzke, A.F.

Paper Title Page
TOAA005 Field Quality Optimization of Superconducting Quadrupoles for the HCX Experiment
 
  • G.L. Sabbi, A. Faltens, A.F. Lietzke, S. Mattafirri, P.A. Seidl
    LBNL, Berkeley, California
  • N. Martovetski
    LLNL, Livermore, California
 
  Funding: Supported by the Office of Energy Research, US DOE, at LBNL and LLNL under contract numbers DE-AC03-76SF00098, W-7405-Eng-48, and at MIT under contract number DE-FC02-93-ER54186.

The High Current Experiment (HCX) is exploring the physics of intense beams with high line-charge density. Superconducting focusing quadrupoles are being developed for future magnetic transport studies at the HCX. A baseline design was selected following the testing of several pre-series models. Optimization of the baseline design led to the development of a first prototype in 2003. This magnet achieved a conductor-limited gradient of 132 T/m in a 70 mm bore without training, with measured field errors at the 0.1% level. Based on these results, both the magnet geometry and the fabrications procedures were modified to further improve the field quality. These modifications were implemented in a second prototype. In this paper, comparisons between the design harmonics and magnetic measurements performed on the new prototype will be presented and discussed.