Speaker
Description
Plasma-based accelerators offer a promising route to compact high-energy particle sources. However, recent theoretical work* has suggested that accelerating a low-energy-spread electron beam may not be feasible at high efficiency because of the excitation of transverse beam break up (BBU) instability. This instability, which leads to a growing spatio-temporal oscillations of the beam centroid, is a consequence of a significant misalignment or loss of symmetry between the beam and the accelerating structure (ion cavity) and arises because of the coupling between the accelerating beam electrons and the plasma sheath electrons surrounding the ion cavity. The instability deteriorates the electron beam parameters (notably, the beam emittance) and hinders the usefulness of the plasma-based accelerators for some potential applications like, particle colliders. Here, using particle-in-cell simulations and analytical modelling, we evaluate the centroid evolution of a partially misaligned trailing electron bunch coupled with a plasma accelerator and provide novel solutions for its suppression. We also present preparation status of an experiment designed to characterize the transverse instability on a well-defined externally injected electron beam from a conventional linac in a CO2 pulse driven LWFA at Accelerator Test Facility (ATF) at Brookhaven National Laboratory (BNL).
Footnotes
- V. Lebdev, A. Burov, S. Nagaitsev, PRAB 20, 121301 (2017).
Funding Agency
We acknowledge the support by the U.S. Department of Energy, Office of Science under Award No. DE-SC0024277, NSF CAREER Award PHY-2238840, resources of NERSC facility, operated under contract No. DE-A
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