Abstract
Beam-driven acceleration of electrons and positrons by the electric field of the plasma wakefield is considered in detail using a self-consistent relativistic cylindrical particle-in-cell code with implicit electromagnetic solver. The plasma characteristics, such as the particle motion, the density, the temperatures, the wake fields, and the energies and their transfer, are investigated. Strong local energization and heating of the plasma electrons are observed. Small groups of ions in the wake can also attain temperatures higher than the secondary ionization potential of lithium vapor. It is verified that an electron bunch indeed excites a wakefield of higher energy than a positron bunch, which, in fact, behaves like a negative charge plasma bunch because of the suck-in of background plasma electrons.
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