Abstract
The ion source for the Spallation Neutron Source (SNS) is a radio‐frequency, multicusp source designed to deliver beams of 45 mA of H− with a normalized rms emittance of 0.2 π mm mrad to the SNS accelerator. RF power with a frequency of 2 MHz is delivered to the ion source by an 80‐kW pulsed power supply generating nominal pulses 1 ms in width with a 60‐Hz repetition rate. The ion source—designed, constructed and commissioned at Lawrence Berkeley National Laboratory (LBNL)—satisfies the basic requirements of commissioning and early operation of the SNS accelerator. To improve reliability of the ion source and consequently the availability of the SNS accelerator and to accommodate facility upgrade plans, we are developing optimal RF‐plasma‐coupling systems at Oak Ridge National Laboratory (ORNL). To date, our efforts have focused on design and development of internal and external ion source antennas having long operational lifetimes and the development and characterization of efficient RF matching networks.
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