Speaker
Description
FRIB utilizes a 28-GHz HPECR ion source as the front end device for generating high-intensity, high-charge-state ion beams. In the middle of the device is a plasma chamber, located within the ion source vacuum vessel and positioned inside the strong axial and radial magnetic fields required for ECR plasma confinement. The plasma chamber serves several essential functions: 1 geometric vacuum boundary of the ECR plasma volume, 2 thermal management for regions that are struck by energetic electrons lost from the ECR plasma, and 3 inter-connection of Injection and Extraction.
This paper presents the mechanical design, fabrication process, and performance of the current chamber. During initial fabrication, four sets of components were machined. Only one assembly achieved full functional success. Lessons learned —including issues related to material deformation, cooling-channel integrity, and interference fitting —were incorporated into a refined fabrication process.
Fabrication results for the improved design will be presented at the conference, including dimensional metrology, cooling and flow performance. Based on the demonstrated validity and robustness of the improved process, the design methodology is extrapolated to future plasma chambers capable of handling up to 10 kW of 28-GHz RF power. Such an upgrade will be required to enable FRIB’s planned operational power ramp-up, ultimately contributing to the delivery of up to 400 kW primary beam power onto the Production Target.
Funding Agency
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics and used resources of the Facility for Rare Isotope Beams (FRIB) Operations, w
| In which format do you inted to submit your paper? | Word |
|---|