Dissipation of electron-beam-driven plasma wakes.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
21 Sep 2020
21 Sep 2020
Historique:
received:
16
08
2019
accepted:
24
08
2020
entrez:
22
9
2020
pubmed:
23
9
2020
medline:
23
9
2020
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 32958741
doi: 10.1038/s41467-020-18490-w
pii: 10.1038/s41467-020-18490-w
pmc: PMC7506535
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
4753Subventions
Organisme : U.S. Department of Energy (DOE)
ID : DE-SC0011617
Organisme : U.S. Department of Energy (DOE)
ID : DE-SC0014043
Organisme : U.S. Department of Energy (DOE)
ID : DE-SC0011617
Organisme : National Science Foundation (NSF)
ID : PHY-1734319
Organisme : National Science Foundation (NSF)
ID : PHY-2010435
Organisme : National Science Foundation (NSF)
ID : PHY-1734319
Organisme : Russian Foundation for Basic Research (RFBR)
ID : 18-42-540001
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