  Plasma wakefields offer high acceleration gradients, orders of magnitude
larger than conventional RF accelerators. However, the achievable luminosity
remains relatively low, typically limited by the plasma recovery time and the
charge which can be accelerated per shot. In this work, we show that a train of
drive bunches can be harnessed to accelerate multiple witness bunches in a
single shot. We demonstrate that periodically loading the wakefields removes
the limit on the energy transfer from the drive beam to the plasma, which
allows the luminosity to be increased. Proof-of-concept simulations for the
AWAKE scheme are carried out to demonstrate the technique, achieving a doubling
of the accelerated charge while exploiting only a fraction of the drive train.
