Dissipation of electron-beam-driven plasma wakes
| Autor: | Spencer Gessner, Vitaly Yakimenko, Jorge Vieira, V. K. Khudyakov, Rafal Zgadzaj, Michael C. Downer, Michael Litos, A. P. Sosedkin, T. Silva, Konstantin Lotov, Mark Hogan, Zhengyan Li, James Allen |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Science
General Physics and Astronomy FOS: Physical sciences Electron 7. Clean energy 01 natural sciences General Biochemistry Genetics and Molecular Biology Linear particle accelerator Article 010305 fluids & plasmas law.invention law Physics::Plasma Physics 0103 physical sciences 010306 general physics lcsh:Science Physics Multidisciplinary Particle accelerator General Chemistry Plasma Laser-produced plasmas Dissipation Physics - Plasma Physics Computational physics Plasma Physics (physics.plasm-ph) Cathode ray Lithium Tokamak Experiment Physics::Accelerator Physics lcsh:Q Beam (structure) Plasma-based accelerators |
| Zdroj: | Nature Communications, Vol 11, Iss 1, Pp 1-11 (2020) Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-020-18490-w |
| Popis: | Metre-scale plasma wakefield accelerators have imparted energy gain approaching 10 gigaelectronvolts to single nano-Coulomb electron bunches. To reach useful average currents, however, the enormous energy density that the driver deposits into the wake must be removed efficiently between shots. Yet mechanisms by which wakes dissipate their energy into surrounding plasma remain poorly understood. Here, we report picosecond-time-resolved, grazing-angle optical shadowgraphic measurements and large-scale particle-in-cell simulations of ion channels emerging from broken wakes that electron bunches from the SLAC linac generate in tenuous lithium plasma. Measurements show the channel boundary expands radially at 1 million metres-per-second for over a nanosecond. Simulations show that ions and electrons that the original wake propels outward, carrying 90 percent of its energy, drive this expansion by impact-ionizing surrounding neutral lithium. The results provide a basis for understanding global thermodynamics of multi-GeV plasma accelerators, which underlie their viability for applications demanding high average beam current. Plasma wakefield accelerators promise compact, affordable future particle accelerators, but require deposition of enormous energy into a small volume. Here, the authors measure and simulate how this energy transfers from the wake into surrounding plasma, a process that ultimately governs the accelerator’s repetition rate. |
| Databáze: | OpenAIRE |
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