Speaker
Description
An upgrade of the magnetic field profile of the Texas A&M 14.5 GHz electron cyclotron resonance ion source, ECR2, is underway, guided by well-established magnetic-field scaling rules. The axial magnetic field at the injection end has been increased by installation of a modified lower-carbon steel plug and replacement of the aluminum biased disk with a steel one. The radial field is being enhanced at the poles through replacement of the existing hexapole assembly with new NdFeB permanent-magnet bars, with the field direction rotated relative to the original design. These bars will be installed in a new, better-cooled aluminum plasma chamber, whose construction was prompted by a recent vacuum break in the inner wall of the existing chamber, which was subsequently repaired. Central to these coupled efforts, optimization studies of the radial magnetic field profile through detailed modeling of the magnet assembly are being performed in COMSOL Multiphysics, with results to be benchmarked against PANDIRA calculations from the original ECR2 design. Once validated, the COMSOL framework will be further used to conduct thermal and demagnetization analyses to guide the cooling-system design of the new chamber and assess long-term magnet integrity. Collectively, these modifications are expected to significantly improve plasma confinement and stability, leading to an increase in high-charge-state ion production.
| Classification | MC1: New developments and status reports |
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