Abstract
Generation of a well-aligned bunch train is of vital importance for preserving the beam quality in a plasma wake-field accelerator. The simultaneous measurements of the relative misalignments in both planes, of the individual femtosecond electron bunches with THz repetition rate in a train, are reported and analyzed with simulations. The new method proposed in this paper demonstrates that the measurements can be done quickly by applying a single quadrupole scan together with a radio-frequency deflector (RFD), while the RFD strength and the RFD phase for each bunch do not need to be known
Highlights
The new method proposed in this paper demonstrates that the measurements can be done quickly by applying a single quadrupole scan together with a radio-frequency deflector (RFD), while the RFD strength and the RFD phase for each bunch do not need to be known
An electron beam consisting of a train of short (∼100 fs scale) bunches, generated by combining laser pulse shaping and electron beam phase-space manipulation [1,2,3,4], has many attracting applications, e.g. two color free-electron laser (FEL) [5,6,7], THz radiation [8,9], superradiant radiation [10], and plasma wake-field acceleration (PWFA) [11,12,13]
The absolute misalignment of each bunch can be calculated straightforwardly by adding the misalignment of the whole bunch train measured by the BPM
Summary
An electron beam consisting of a train of short (∼100 fs scale) bunches, generated by combining laser pulse shaping and electron beam phase-space manipulation [1,2,3,4], has many attracting applications, e.g. two color free-electron laser (FEL) [5,6,7], THz radiation [8,9], superradiant radiation [10], and plasma wake-field acceleration (PWFA) [11,12,13]. In PWFA, a leading high-charge drive bunch (train) is used to excite fields in a plasma that in turn accelerate a trailing low-charge witness bunch. This technique offers the possibility for an affordable and compact high-energy collider as the plasma wave can sustain accelerating gradients several orders of magnitude higher than conventional accelerators. A new method is proposed to simultaneously measure the relative misalignments of the individual femtosecond electron bunches with THz repetition rate in a train in both planes. The simulations and measurements agree very well, confirming the validity of this method
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