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WEO3LR01 |
Beam Setup Conditions and Comparison of Deal and Actual Production Conditions |
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- M.A. Plum, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA
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Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.
This presentation will review methods for experimental determination of optimal operational set points in a multi-cavity superconducting high power hadron linac. A typical tuning process, including establishing correct acceleration profile and rms bunch size matching, is based on comparisons between measured data and results of simulations from envelope, single and multi-particle models. Presence of significant space charge effects requires simulation and measurement of bunch dynamics in three dimensions to ensure low loss beam transport. This is especially difficult in a superconducting linac where the use of interceptive beam diagnostics is usually restricted because of the risk of SRF cavity surface contamination. The procedures discussed here are based on non-interceptive diagnostics such as beam position monitors and laser wires, and conventional diagnostics devices such as wire scanners and bunch shape monitors installed outside the superconducting linac. The longitudinal Twiss analysis based on the BPM signals will be described. The superconducting SNS linac tuning experience will be used to demonstrate problems and their solution for real world linac tune-up procedures.
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Slides WEO3LR01 [7.162 MB]
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| WEO3AB02 |
Status of Preparations for a 10 us H− Laser-Assisted Stripping Experiment |
299 |
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- S.M. Cousineau, A.V. Aleksandrov, V.V. Danilov, T.V. Gorlov, Y. Liu, A.A. Menshov, M.A. Plum, A. Rakhman, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA
- F.G. Garcia, N.F. Luttrell
UTK, Knoxville, Tennessee, USA
- Y. Takeda
KEK, Ibaraki, Japan
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At the Spallation Neutron Source accelerator preparations are underway for a 10 us laser-assisted H− stripping experiment. This is a three orders of magnitude increase in pulse duration compared the to initial 2006 proof of principle experiment. The focus of the experiment is the validation of methods that reduce the average laser power requirement, including laser-ion beam temporal matching, ion beam dispersion tailoring, and specialized longitudinal and transverse optics. In this presentation we report on the status of preparations and the anticipated schedule for the experiment.
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Slides WEO3AB02 [7.250 MB]
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| THO2LR01 |
H− Beam Optics for the Laser Stripping Project |
350 |
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- T.V. Gorlov, A.V. Aleksandrov, S.M. Cousineau, V.V. Danilov, M.A. Plum
ORNL, Oak Ridge, Tennessee, USA
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Successful realization of the laser stripping experiment depends mainly on correct tailoring of H− bunch and laser beam. H− beam preparation is a challenging task that requires to tune up about 10 parameters simultaneously in situ and taking into account life state of accelerator. This makes a huge technological difference compared to the foil stripping method. In this paper we present experience and methods of tuning the H− bunch.
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FRO1AU04 |
Working Group D Summary |
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- S.S. Gilardoni
CERN, Geneva, Switzerland
- M.A. Plum
ORNL, Oak Ridge, Tennessee, USA
- S. Wang
IHEP, Beijing, People's Republic of China
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Summary of Working Group D
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Slides FRO1AU04 [1.486 MB]
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