AN ANALYSIS OF ORBIT PUMPING PHENOMENA IN QUADRUPOLES.
STANFORD UNIV CALIF MICROWAVE LAB
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The conditions for orbit pumping quadrupoles are evaluated by a rigorous perturbation analysis. Orbit pumping thresholds are presented for a variety of conditions. Comparison of orbit pumping for the cyclotron wave parametric amplifier the Adler tube and the synchronous wave dc pumped amplifier shows larger susceptibility to orbit pumping for the latter. Depending on the dc space charge in the beam, the threshold for the dc pumped amplifier is lower by a factor of two to four, measured in decibels. Author