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A monopole HOM impedance can contribute the maximum growth rate to a
symmetric longitudinal mode when the HOM frequency happen to fall on a
revolution harmonic upper synchrotron sideband. Similarly, a dipole
HOM impedance can contribute the maximum growth rate to a symmetric
transverse mode when the HOM frequency happen to fall on a revolution
harmonic lower betatron sideband. An optional data column may be
included in the HOM definition file (see section 4) to force selected HOM frequencies onto dangerous
resonances. Because of the relatively low probability for HOM
frequencies to hold exactly these resonant values, this option is
mostly useful in checking the calculated growth rates against those
obtained in hand calulations.

Randy Flood
2006-11-06