IBIC2017 - List of Authors (Wong, C.Y.)

Paper	Title	Page
MOPCC14	Physics Model of an Allison Phase-Space Scanner, with Application to the FRIB Front End	72
	C.Y. Wong NSCL, East Lansing, Michigan, USA S. Cogan, Y. Hao, S.M. Lidia, S.M. Lund, T. Maruta, D.O. Omitto, P.N. Ostroumov, G. Pozdeyev, H.T. Ren, R. Shane, T. Yoshimoto, Q. Zhao FRIB, East Lansing, USA
	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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCC14
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Paper

Title

Page

Physics Model of an Allison Phase-Space Scanner, with Application to the FRIB Front End

72

C.Y. Wong
NSCL, East Lansing, Michigan, USA
S. Cogan, Y. Hao, S.M. Lidia, S.M. Lund, T. Maruta, D.O. Omitto, P.N. Ostroumov, G. Pozdeyev, H.T. Ren, R. Shane, T. Yoshimoto, Q. Zhao
FRIB, East Lansing, USA

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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCC14

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)