Beams Document 3524-v1

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Next-Generation H- Ion Sources for SNS

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Camille M. Ginsburg
Updated by:
Camille M. Ginsburg
Document Created:
14 Dec 2009, 11:46
Contents Revised:
14 Dec 2009, 11:46
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14 Dec 2009, 11:46
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The Spallation Neutron Source (SNS) is an accelerator-based, pulsed neutron-scattering facility which has recently achieved the milestone of delivering 1 MW of beam power to the neutron production target using the modified LBNL H- source. Measured between the RFQ and the LINAC, this baseline source has demonstrated 56 mA, which is only 5% short of the beam required for future 3 MW operations. The same source delivered 42 mA for one 24-day production period, which is 10% more beam than required for the optimistic baseline of 1.4 MW beam power. Occasional antenna failures limit the source availability to ~99.5%. In order to improve availability, we are developing an RF-driven, H- ion source based on a water-cooled, ceramic aluminum nitride (AlN) plasma chamber and external antenna. To date, early versions of this source have demonstrated up to 42 mA between the RFQ and the Linac and unanalyzed beam currents up to ~100mA (60Hz, 1ms) have been measured at the output of the LEBT on the ion source test stand. This source was implemented on the SNS accelerator in March 2009 and produced roughly the required 35 mA. Due to its availability of 96.6% during the 8 weeks of service, it was replaced with the baseline source. This presentation will first provide a brief status of the SNS facility, provide details of reliability issues associated with the external antenna source which emerged during operation and discuss proposed engineering solutions. In addition, future directions in source development will be discussed such as helicon plasma formation and next-generation extraction systems.
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