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 language | English |
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Title of host publication | Proceedings of the 6th International Beam Instrumentation Conference, IBIC 2017 |
Publisher | Joint Accelerator Conferences Website (JACoW) |
Pages | 72-76 |
Number of pages | 5 |
ISBN (Electronic) | 9783954501922 |
DOIs | |
State | Published - 2017 |
Externally published | Yes |
Event | 6th International Beam Instrumentation Conference, IBIC 2017 - Grand Rapids, United States Duration: Aug 20 2017 → Aug 24 2017 |
Publication series
Name | Proceedings of the 6th International Beam Instrumentation Conference, IBIC 2017 |
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Conference
Conference | 6th International Beam Instrumentation Conference, IBIC 2017 |
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Country/Territory | United States |
City | Grand Rapids |
Period | 08/20/17 → 08/24/17 |
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