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Recently in a paper by Lebedev et al it was demonstrated that the efficiencyof the energy transfer from the drive bunch to the witness bunch in the plasmawakefield accelerator has a limit due to the BBU instability of the witnessbunch. It was stated that the efficiency-instability relation is universal andthus should be considered as a fundamental limit. In this note, we show thatrecent results on the short-range wakefields indicate that this relation shouldbe modified and conclusions of the paper by Lebedev et al should bereconsidered. In particular, we argue that the efficiency-instability relationproduces only the lower bound for efficiency and thus does not produce afundamental limit.

On "Efficiency versus Instability in plasma accelerators"