Spin-resonance strength produced by a localized rf field has been a focus of recent publications [V. S. Morozov et al., Phys. Rev. ST Accel. Beams 7, 024002 (2004).; M. A. Leonova et al. (to be published).; T. Roser, in Handbook of Accelerator Physics and Engineering, edited by A. W. Chao and M. Tigner (World Scientific, Singapore, 1999), p. 151.; M. Bai, W. W. MacKay, and T. Roser, Phys. Rev. ST Accel. Beams 8, 099001 (2005).; V. S. Morozov et al., Phys. Rev. ST Accel. Beams 8, 099002 (2005).]. This paper discusses the debated factor of 2, and provides a formula to calculate the component enhanced by the induced betatron motion.

• Received 16 April 2006

DOI:https://doi.org/10.1103/PhysRevSTAB.9.074001

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