Electron cyclotron resonance ion source frequency scaling and radial confinement in a quadrupole magnetic field

Abstract

Experiments have been conducted on Constance B to study transport properties in electron cyclotron resonance (ECR) heated plasmas of high-charge-state neon ions. Measurements were made of confinement parallel and perpendicular to the magnetic field at heating frequencies of 10.5 and 14 GHz, and corresponding ECR magnetic field strengths. Although radial ion losses scaled approximately as B−2, the total particle confinement time was independent of magnetic field. Thus, higher current densities of multicharged neon ions were extracted at higher ECR heating frequency and magnetic field.