Abstract
Beam-driven collinear wakefield accelerators (CWAs) that operate by using slow-wave structures or plasmas hold great promise toward reducing the size of contemporary accelerators. Sustainable acceleration of charged particles to high energies in the CWA relies on using field-generating relativistic electron bunches with a highly asymmetric peak current profile and a large energy chirp. A new approach to obtaining such bunches has been proposed and illustrated with the accelerator design supported by particle tracking simulations. It has been shown that the required particle distribution in the longitudinal phase space can be obtained without collimators, giving CWAs an opportunity for employment in applications requiring a high repetition rate of operation.
Highlights
In a beam-based collinear wakefield accelerator (CWA), a high-charge drive bunch generates an electromagnetic field passing through a slow-wave structure or plasma
The correspondingly revised diagram of the accelerator beam line shown in Fig. 8 was used as a new starting point to investigate the performance of the proposed bunchshaping process with ELEGANT tracking simulations taking into account the transverse beam dynamics
We have presented the design of an accelerator capable of generating 1 GeV electron bunches with a highly asymmetric current profile and a large energy chirp required for a collinear wakefield accelerator
Summary
In a beam-based collinear wakefield accelerator (CWA), a high-charge drive bunch generates an electromagnetic field passing through a slow-wave structure (a dielectriclined or corrugated waveguide) or plasma. The employed technique is rather generic and can be adapted to other accelerator beam lines for preparing electron-bunch current distributions with profiles different than those considered in this paper. The advantage of the backtracking technique over usual (forward) tracking methods is that it simplifies the optimization process by first exploring beam line configurations that provide the final longitudinal phase-space (LPS) distribution while providing plausible input distribution. Such an approach is less constraining than a forward-tracking optimization where an initial distribution would have to be selected and parametrized. The main focus of the work was to obtain a drive bunch with the required distribution in the longitudinal phase space (LPS), an important additional objective was to ensure the associated transverse emittances commensurate with the small-aperture CWA
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