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 present measurements of bounce harmonic Landau damping due to z-variations in the plasma potential, created by an azimuthally symmetric “squeeze” voltage Vs applied to the cylindrical wall. Traditional Landau damping on spatially uniform plasma is weak in regimes where the wave phase velocity vph≡ω/k is large compared to the thermal velocity. However, z-variations in plasma density and potential create higher spatial harmonics, which enable resonant wave damping by particles with bounce-averaged velocities vph/n, where n is an integer. In our geometry, the applied squeeze predominantly generates a resonance at vph/3. Wave-coherent laser induced fluorescence measurements of particle velocities show a distinctive Landau damping signature at vph/3, with amplitude proportional to the applied Vs. The measured (small amplitude) wave damping is then proportional to Vs2, in quantitative agreement with theory over a range of 20 in temperature. Significant questions remain regarding “background” bounce harmonic ...

Bounce harmonic Landau damping of plasma waves