Abstract
Existing methods of matching the low-energy Hbeam from the ion source into the Radio. Frequency- Quadrupole (RFQ) accelerator using gas focusing and magnetic lenses suffer from beam loss emittance growth and inadequate control capability. It is shown that an electrostatic quadrupole (ESQ) system is an attractive alternative providing strong focusing and good control as well as preventing plasma build*up and associated problems. A new conceptual design of an ESQ system for matching a 120 keV 120 mA beam with a normalized 4xrms emittance of 3 x i0 m-rad into a 425-MHz RFQ is developed using laminarflow and linear-optics codes and a modified PARMILA particle-in-cell simulation code which includes the nonlinear effects of the external fields and space charge. Simulation results show a 100 transmission and low emittance growth. 1.© (1990) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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