The SNS has been delivering production neutrons for five years with first beam delivered to the neutron target at the end of April 2006. On September 18, 2009 SNS officially reached 1 megawatt of beam on target marking the achievement of a decades-old dream of providing a U.S. megawatt-class pulsed spallation source. The SNS is now routinely delivering 1 megawatt of beam power to the neutron target at over 85 percent of the scheduled beam time. The present effort is aimed at eventually increasing availability to 95 percent and gradually increasing the intensity to the 1.4 megawatt design level. While the RF systems have performed well since initial installation some improvements have been implemented. This paper provides a review of the SNS RF Systems, an overview of the performance of the various components and a detailed review of RF-related issues addressed over the past several years.

Status of the oak ridge spallation neutron source (sns) rf systems

HEBT BNL NC Linac LANL Front End LBNL The SNS linac will deliver a 1 GeV proton beam for injection into its accumulator ring. The normal conducting section of the linac has the RFQ and drift tube linac (DTL) powered by seven 2.5 MW, 402.5 MHz klystrons and the coupled cavity linac (CCL) powered by four 5.0 MW, 805 MHz klystrons. The superconducting section of the linac employs eighty one 6-cell cavities power by eighty one 550 kW, 805 MHz klystrons. In the tunnel after the successful commissioning of the front end, three DTL tanks, two CCL modules, and eight medium-beta cryomodules have been installed. Corresponding high voltage converter modulators (HVCM) and low level rf (LLRF) control systems have been installed and tested. Linac Controls MEBT & 2 chopper Medium beta High beta DTL CCL RFQ SC Linac JLAB H Injector 86.8 MeV 2 HEBT Cavities 2.5 MeV 185 MeV 1000 MeV 805 MHz, 0.55 MW 805 MHz, 5.0 MW 402.5 MHz, 2.5 MW

Status of the sns linac rf systems

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Status of the sns linac rf systems