Physics model of an Allison phase-space scanner, with application to the frib front end

Chun Yan Jonathan Wong, Scott Cogan, Yue Hao, Steven Lidia, Steven M. Lund, Tomofumi Maruta, Diego Omitto, Peter Ostroumov, Eduard Pozdeyev, Haitao Ren, Rebecca Shane, Takashi Yoshimoto, Qiang Zhao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

We study Allison-type phase-space scanners by extending analytic models to include two important geometric features that are conventionally omitted, namely asymmetric slit-plate to dipole-plate gaps at the two ends and finite slit-plate thickness. Their effects can be significant for high-resolution Allison scanners and lead to two corrections in the measurement data relative to more idealized descriptions: 1) a change in the voltage-to-angle conversion relation, and 2) a data point weight compensation factor. These findings are corroborated by numerically integrated single-particle trajectories in a realistic 2D field map of the device. The improved model was applied to the Allison scanner used to measure a 12 keV/u heavy-ion beam in the front-end of the Facility for Rare Isotope Beams (FRIB) at Michigan State University. Preliminary measurements show that the improved model results in significant (&10%) modifications to beam moments, thus rendering the corrections important for accurate phase-space characterizations.

Original languageEnglish
Title of host publicationProceedings of the 6th International Beam Instrumentation Conference, IBIC 2017
PublisherJoint Accelerator Conferences Website (JACoW)
Pages72-76
Number of pages5
ISBN (Electronic)9783954501922
DOIs
StatePublished - 2017
Externally publishedYes
Event6th International Beam Instrumentation Conference, IBIC 2017 - Grand Rapids, United States
Duration: Aug 20 2017Aug 24 2017

Publication series

NameProceedings of the 6th International Beam Instrumentation Conference, IBIC 2017

Conference

Conference6th International Beam Instrumentation Conference, IBIC 2017
Country/TerritoryUnited States
CityGrand Rapids
Period08/20/1708/24/17

Funding

∗ Work supported by the U.S. DOE Office of Science under Cooperative Agreement DE-SC0000661 and the NSF under Grant No. PHY-1102511. † [email protected] ‡ On leave from KEK/J-PARC

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