English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We have found, using 1D periodic Vlasov-Poisson simulations, new nonlinear,nonstationary, stable, long lived, coherent structures in phase space, calledkinetic electrostatic electron nonlinear (KEEN) waves. Ponderomotively drivenfor a short period of time, at a particular frequency and wavenumber, wellinside the band gap that was thought to exist between electron plasma andelectron acoustic wave frequencies, KEEN waves are seen to self-consistentlyform, and persist for thousands of plasma periods. KEEN waves are comprised of4 or more significant phase-locked harmonic modes which persist only whendriven sufficiently strongly. They also merge when two or more at differentfrequencies are driven sequentially. However, the final stable KEEN state thatemerges is highly sensitive to their relative order of excitation. KEEN wavesalso interact quite strongly with electron plasma waves (EPW) especially whentheir harmonics are close to being resonant with the EPW frequency at the samek. The common assumption that whenever sufficiently large amplitude coherentlaser energy is present in an unmagnetized plasma, EPWs and IAWs are the onlywaves with which the electromagnetic energy can interact coherently may requirereconsideration.

Kinetic Electrostatic Electron Nonlinear (KEEN) Waves and their Interactions Driven by the Ponderomotive Force of Crossing Laser Beams