An improved version of the focusing magnet for a heavy ion fusion (HIF) accelerator was designed, built and tested in 2002-2003. This quadrupole has higher focusing power and lower error field than the previous version of the focusing quadrupoles successfully built and tested in 2001. We discuss the features of the new design, selected fabrication issues and test results.
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Martovetsky et al. (2004) studied this question.
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