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TY - CONF AU - Wong, C.Y. AU - Cogan, S. AU - Hao, Y. AU - Lidia, S.M. AU - Lund, S.M. AU - Maruta, T. AU - Omitto, D.O. AU - Ostroumov, P.N. AU - Pozdeyev, G. AU - Ren, H.T. AU - Shane, R. AU - Yoshimoto, T. AU - Zhao, Q. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Physics Model of an Allison Phase-Space Scanner, with Application to the FRIB Front End J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - 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. PB - JACoW CP - Geneva, Switzerland SP - 72 EP - 76 KW - ion KW - dipole KW - emittance KW - simulation KW - cyclotron DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-MOPCC14 UR - http://jacow.org/ibic2017/papers/mopcc14.pdf ER -