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4. See AIP document No. PAPS PHPAE 02-3194-17 for 17 pages of “Multipactor Discharge Across a Magnetic Field,” Varian Interoffice Memo, 1976, by H. McDowell. Order by PAPS number and journal reference from American Institute of Physics, Physics Auxiliary Publication Service, Carolyn Gehlbach, 500 Sunnyside Boulevard, Woodbury, NY 11797–2999. Fax: 516–576–2223, e-mail: janis@aip.org. The’price is $1.50 for each microfiche (98 pages) or $5.00 for photocopies of up to 30 pages, and $0.15 for each additional page over 30 pages. Airmail additional. Make checks payable to the American Institute of Physics.
5. When G is negative the sign of δn+1≃G δφn alternates from step to step. Hence, from δφn+1−δφn =(G−1)δφn, we have |(δφn+1−δφn)/δφn)| = |G|++1>1. The map (27) must be iterated twice to ensure small relative changes in δφwhen−1