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HD3 is the latest magnet of a series of block-type Nb$_3$Sn dipole model magnets developed by the Superconducting Magnet Program at Lawrence Berkeley National Laboratory. The magnet is 1 m long with a clear aperture of 43 mm. As a model magnet designed with accelerator-quality features, each coil has flared ends to provide a clear bore for a beam tube. The magnet design was also optimized to minimize the geometric and saturation field errors. In 2013, HD3b reached a peak dipole field of 13.4 T at 4.4 K. As part of the magnet test, we measured field quality using rotating coils with lengths of 26 and 130 mm developed by Fermi National Accelerator Laboratory. Here, we report and analyze the measured static and dynamic field errors. We discuss the insight provided by the field quality study of HD3, which can be useful for the development of high-field block-type dipole magnets for next-generation circular colliders.

ieee transactions on applied superconductivity

Field Quality of HD3—A Nb&lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;$_3$&lt;/tex-math&gt; &lt;/inline-formula&gt;Sn Dipole Magnet Based on Block Design