Measurement of longitudinal acceptance and emittance of the Oak Ridge Spallation Neutron Source Superconducting Linac

The longitudinal acceptance of the Spallation Neutron Source superconducting linac is computed with a longitudinal model. A beam current monitor and beam loss monitors are utilized in a new beam acceptance measurement technique, and the measured results show close agreement with the model. Based on...

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Bibliographic Details
Published inPhysical review special topics. PRST-AB. Accelerators and beams Vol. 11; no. 10; p. 104001
Main Authors Zhang, Y., Galambos, J., Shishlo, A.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.10.2008
Subjects
Emittance
Measurement methods
Measurement techniques
Neutrons
Spallation
Superconductivity
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Summary:The longitudinal acceptance of the Spallation Neutron Source superconducting linac is computed with a longitudinal model. A beam current monitor and beam loss monitors are utilized in a new beam acceptance measurement technique, and the measured results show close agreement with the model. Based on the simulations and on the measurements of the superconducting linac acceptance, we developed a novel method to measure beam bunch shape, beam energy profile, and the longitudinal emittance at the entrance of the linac. The experimental measurements reveal that a large longitudinal beam halo exists in the injected beam to the superconducting linac, and the longitudinal rms emittance is approximately twice that of the nominal design. The simple measurement method is applicable to other superconducting linacs.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.11.104001