2004•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Open access
Low-power RF tuning of the Spallation Neutron Source warm LINAC structures
C. Deibele, J.H. Billen, L.M. Young, A. Vasyuchenko, J. Error, Paul Gibson, G. Johnson, Nathan Bultman, J. Stovall, J. Manolitsas, Daniel Trompetter
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Abstract
The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. A conventional 402.5-MHz drift-tube linac (DTL) accelerates the H{sup -} beam from 2.5 to 86 MeV, followed by a 805-MHz coupled-cavity linac (CCL) to 186 MeV. Tuning the six DTL tanks involves adjusting post-coupler lengths and slug tuners to achieve the design resonant frequency and stabilized field distribution. A 2.5-MW klystron feeds RF power into a DTL through a ridge-loaded waveguide. The CCL consists of 4 RF modules operating in the {pi}/2 mode. Each module contains 96 accelerating cavities in 12 segments of 8 cavities each, 11 active bridge coupler cavities, and 106 nominally unexcited coupling cavities. For each RF module, power from a 5-MW klystron splits and drives bridge couplers 3 and 9. We will discuss the procedures and special tools developed for the structure tuning.
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