I. D. Kaganovich, R. C. Davidson, M. A. Dorf, E. A. Startsev, A. B. Sefkow, E. P. Lee, and A. Friedman, “Physics of neutralization of intense high-energy ion beam pulses by electrons,” Phys. Plasmas 17, 056703 (2010). http://pop.aip.org/resource/1/phpaen/v17/i5/p056703_s1 .