Figure 4
From: Positron acceleration in a hollow plasma channel up to TeV regime
(a) The mean energy (red) and energy spread (blue) of the witness positrons as a function of propagation distance. (b) Radiation loss rate (radiation loss/energy gain) for the positron beam as a function of witness energy (dots) and the γ2 scaling (red line). (c) Time dependence of the radial position (blue) and radiation power (red) for a test positron initially at rin = 0.3 mm, the green dashed line shows the critical radius rc. (d) Normalized emittance of the full witness bunch (red) and core particles (blue) in first 100 meters of the acceleration.
