Modulational instability in large-amplitude linear laser wakefields
We investigate the growth of ion density perturbations in large-amplitude linear laser wakefields via two-dimensional particle-in-cell simulations. Growth rates and wave numbers are found to be consistent with a longitudinal strong-field modulational instability (SFMI). We examine the transverse dep...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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American Physical Society
2023
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| _version_ | 1797109029026136064 |
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| author | von Boetticher, A Walczak, R Hooker, SM |
| author_facet | von Boetticher, A Walczak, R Hooker, SM |
| author_sort | von Boetticher, A |
| collection | OXFORD |
| description | We investigate the growth of ion density perturbations in large-amplitude linear laser wakefields
via two-dimensional particle-in-cell simulations. Growth rates and wave numbers are found to
be consistent with a longitudinal strong-field modulational instability (SFMI). We examine the
transverse dependence of the instability for a Gaussian wakefield envelope and show that growth
rates and wavenumbers can be maximised off-axis. On-axis growth rates are found to decrease with
increasing ion mass or electron temperature. These results are in close agreement with the dispersion
relation of a Langmuir wave with energy density that is large compared to the plasma thermal energy
density. The implications for wakefield accelerators, in particular multi-pulse schemes, are discussed. |
| first_indexed | 2024-03-07T07:34:48Z |
| format | Journal article |
| id | oxford-uuid:5be7fe87-a4e3-41fd-b8e9-f6eefad4abc3 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:34:48Z |
| publishDate | 2023 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:5be7fe87-a4e3-41fd-b8e9-f6eefad4abc32023-03-07T11:33:05ZModulational instability in large-amplitude linear laser wakefieldsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5be7fe87-a4e3-41fd-b8e9-f6eefad4abc3EnglishSymplectic ElementsAmerican Physical Society2023von Boetticher, AWalczak, RHooker, SMWe investigate the growth of ion density perturbations in large-amplitude linear laser wakefields via two-dimensional particle-in-cell simulations. Growth rates and wave numbers are found to be consistent with a longitudinal strong-field modulational instability (SFMI). We examine the transverse dependence of the instability for a Gaussian wakefield envelope and show that growth rates and wavenumbers can be maximised off-axis. On-axis growth rates are found to decrease with increasing ion mass or electron temperature. These results are in close agreement with the dispersion relation of a Langmuir wave with energy density that is large compared to the plasma thermal energy density. The implications for wakefield accelerators, in particular multi-pulse schemes, are discussed. |
| spellingShingle | von Boetticher, A Walczak, R Hooker, SM Modulational instability in large-amplitude linear laser wakefields |
| title | Modulational instability in large-amplitude linear laser wakefields |
| title_full | Modulational instability in large-amplitude linear laser wakefields |
| title_fullStr | Modulational instability in large-amplitude linear laser wakefields |
| title_full_unstemmed | Modulational instability in large-amplitude linear laser wakefields |
| title_short | Modulational instability in large-amplitude linear laser wakefields |
| title_sort | modulational instability in large amplitude linear laser wakefields |
| work_keys_str_mv | AT vonboettichera modulationalinstabilityinlargeamplitudelinearlaserwakefields AT walczakr modulationalinstabilityinlargeamplitudelinearlaserwakefields AT hookersm modulationalinstabilityinlargeamplitudelinearlaserwakefields |