This report is part of an ongoing study of Soviet research and development of high-current, high-energy charged particle beams and their scientific and technological applications. It examines Soviet research on (1) the radio frequency quadrupole (RFQ) and (2) the alternating phase focusing (APF) methods of accelerating and focusing proton (and heavy ion) beams in linear accelerators, as reported in Soviet open-source technical publications. The author finds that Soviet work on optimizing the operating parameters in the RFQ and APF structures of the ion linear accelerator systems has kept abreast of corresponding developments in the United States.
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