Speaker
Description
Superconducting electron cyclotron resonance (ECR) ion sources are in operation around the world for heavy ion accelerators. These sources rely on magnets wound using Nb-Ti conductors. Due to its higher magnetic field limits, Nb3Sn conductors can result in a magnet providing stronger magnetic fields to enable higher intensity high charge beams. In this context, LBNL is collaborating with the FRIB to build a sextupole-in-solenoid magnet for a >28 GHz superconducting ECR ion source. A prototype Nb3Sn sextupole coil has been fabricated. It is tested using a mirror magnet structure. Earlier on we reported the tooling and process for the prototype coil fabrication. Here we report on the magnetic design and mechanical analysis of the mirror magnet assembly for prototype coil testing, and magnet assembly using a bladder and key
method assisted with strain gauges and fiber optics measurements. Additionally, we report the test results in liquid Helium. The magnet reached a conductor peak field of 9.7 T with 1640 A, achieving 75% of its short sample limit, after three spontaneous quenches. It also carried 1200 A for 10 minutes without quenching. The results qualifies the sextupole coil built for use to build a >40 GHz ECR Ion Source. We report on characteristics of the mirror magnet relevant for the ECR Ion Source, including flux jump induced voltages and quench protection. We also provide
a prospect of designing and fabricating a >40 GHz ion source magnet .
Funding Agency
This work was supported by the U.S. Department of Energy,
Office of Science, Office of Nuclear Physics under the Cooperative
Agreement DE-SC0023633.
| Classification | MC2: New concepts and next generation sources |
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