A microwave-driven negative ion source

Abstract
A 2.45 GHz microwave‐driven ion source, originally developed to generate a high‐current 1H+ beam, has been adapted to serve as a universal negative‐ion injector for the Tandem Accelerator Superconducting Cyclotron (TASCC) facility. Positive heavy ion currents from the source are converted into negative currents by means of a charge‐exchange canal. So far, beams of 4He, 16O, and 18O have been accelerated through the TASCC Tandem and 3He and 209Bi beams were accelerated through both the TASCC Tandem and cyclotron. A production version of the source has been designed, with emphasis on enhanced compactness and serviceability.

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