Abstract
Perhaps the most dangerous instability for electron linear induction accelerators (LIA) is the beam breakup (BBU) instability [1, 2, 3]. For flash-radiography LIAs like DARHT or Scorpius it is particularly troublesome, because low-level high-frequency BBU motion can blur the source spot. Theoretically, the number of e-foldings Γ of exponential BBU growth in an LIA is linearly proportional to beam current I, number of accelerating cells N, and transverse coupling impedance Z⊥, and inversely proportional to the strength of magnetic focusing B.
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