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| Title | Theoretical and Computational Modeling of a Plasma Wakefield BBU Instability | |
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| Abstract | Plasma wakefield accelerators achieve accelerating gradients on the order of the wave-breaking limit, m c² k_{p}/e, so that higher accelerating gradients correspond to shorter plasma wavelengths. Small-scale accelerating structures, such as plasma and dielectric wakefields, are susceptible to the beam break-up instability (BBU), which can be understood from the Panofsky-Wenzel theorem: if the fundamental accelerating mode scales as b⁻¹ for a structure radius b, then the dipole mode must scale as b⁻³, meaning that high accelerating gradients necessarily come with strong dipole wake fields. Because of this relationship, any plasma-accelerator-based future collider will require detailed study of the trade-offs between extracting the maximum energy from the driver and mitigating the beam break-up instability. Recent theoretical work* predicts the tradeoff between the witness bunch stability and the amount of energy that can be extracted from the drive bunch, a so-called efficiency-instability relation . We will discuss the beam break-up instability and the efficiency-instability relation and the theoretical assumptions made in reaching this conclusion. We will also present preliminary particle-in-cell simulations of a beam-driven plasma wakefield accelerator used to test the domain of validity for the assumptions made in this model. | |
| Footnotes & References | * V. Lebedev, A. Burov, and S. Nagaitsev, "Efficiency versus instability in plasma accelerators", Phys. Rev. Acc. Beams 20, 121301 (2017). |
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| Funding | This work was supported in part by the Department of Energy, Office of Science, Office of High Energy Physics, under contract number DE-SC0018718. | |
| Paper | download WEPLG03.PDF [0.451 MB / 4 pages] | |
| Slides | download WEPLG03_TALK.PDF [2.234 MB] | |
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |
| Conference | ICAP2018 | |
| Series | International Computational Accelerator Physics Conference (13th) | |
| Location | Key West, FL, USA | |
| Date | 20-24 October 2018 | |
| Publisher | JACoW Publishing, Geneva, Switzerland | |
| Editorial Board | Volker RW Schaa (GSI, Darmstadt, Germany); Kyoko Makino (MSU, East Lansing, MI, USA); Pavel Snopok (IIT, Chicago, IL, USA); Martin Berz (MSU, East Lansing, MI, USA) | |
| Online ISBN | 978-3-95450-200-4 | |
| Received | 01 November 2018 | |
| Accepted | 28 January 2019 | |
| Issue Date | 04 May 2019 | |
| DOI | doi:10.18429/JACoW-ICAP2018-WEPLG03 | |
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