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Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotron radiation

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Figure

FIG. 1: (Color online). (a) Snapshots of trapped electron sheet atdifferent times (given as label) colored according to transverse mo-from 2D PIC simulation insion appears as an annular beam propagating as a radially polarized,half-cycle, attosecond (RHA)
Fig. 1(a). Therefore, the radiated pulse is almost overlappedwith the sheet profile during the contraction phase and natu-rally has an attosecond duration
FIG. 3: (Color online). Snapshots of (a) electron density ne/nc and(b) transverse wake field Ey,w/E0 taken when the first wake waveperiod is approaching the density plateau region
FIG. 4: (Color online). Particle tracking of 400 uniformly distribut-ed electrons picked from the lower half of the sheet attimes indicated;electron which was initially located near the center of the lower halfand belongs to the most energetic ones after a
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