| Paper |
Title |
Page |
| THAZ02 |
SNS Commissioning Strategies and Tuneup Algorithms
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283 |
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- J. Galambos
ORNL, Oak Ridge, Tennessee
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The Spallation Neutron Source (SNS) has been recently commissioned. The strategies for the initial beam commissioning of the superconducting linac (SCL) and storage ring will be discussed. The SCL commissioning had to accommodate an unanticipated wide range of cavity performance, compared to design expectations. Methods for setting cavity phases and determination of amplitudes will be discussed. The ring commissioning involved the usual establishment of a circulating beam, and then measurement and correction the tune and beta functions, all with a low intensity beam. Then the gradual increase of beam intensity and commissioning of RF and phase space painting were investigated. The methods to accomplish these tasks will be discussed. In general, the first order beam behavior is well understood. Key factors in the successful commissioning are: flexibility in accommodating beam conditions that are different from the design, good communication between the different groups, and attention to detail. Examples for these factors will be emphasized.
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| THAZ05 |
Beam Loss Management and Machine Protection in Beam Commissioning
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0 |
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- C. Sibley, J. Galambos
ORNL, Oak Ridge, Tennessee
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Machine Protection Systems during commissioning have to be very reliable and flexible. The consequence of not disabling the beam could be catastrophic in terms of the superconducting cavities or High Power mercury targets. On the other hand, as the machine is commissioned the beam parameters are being measured which in turn causes beam loss so losses are unavoidable. One commissioning activity involves fault studies where worst case beam loss scenarios are investigated and radiation in occupied area’s is measured and verified to be with the safety limits when extracted to full power. The beam loss monitor system also gets calibrated during these studies. These activities require flexibility in the system to be able to bypass MPS inputs while maintaining strict configuration control over the MPS hardware and software systems.
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