Abstract
Magnet design codes, plasma dispersion solvers, and particle-in-cell (PIC) simulation codes have been used to arrive at the first step in the design of an advanced ion source based on ECR technology. The advanced concept design uses a minimum-B magnetic mirror geometry, which consists of a multicusp magnetic field, to assist in confining the plasma radially, a flat central field for tuning to the ECR resonant condition, and specially tailored mirror fields in the end zones to confine the plasma in the axial direction. The magnetic field is designed to achieve an axially symmetric plasma volume with constant mode-B, which extends over the length of the central field region. The design permits separation of the ‘‘tune’’ and confinement magnetic fields, thus enabling the use of low-frequency, low-cost microwave power sources; the location and increased physical size of the ECR zone over those in conventional sources is commensurate with the generation of higher beam intensities, higher charge states and a higher degree of ionization. A summary of the results of these studies is presented in this report.
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