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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using the recently-installed Fast-Ion Deuterium Alpha (FIDA) spectrometer,the effects of low-frequency (20-50 kHz) chirping energetic particle modes withtoroidal mode number n \geq 1 on the fast-ion population in MAST plasmas areconsidered. Results from the FIDA diagnostic are presented and discussed in thelight of the present theoretical understanding of these modes, known asfishbones, in plasmas with reversed shear. Measurements of the fast-ionpopulation reveal strong redistribution of fast ions in both real and velocityspace as a result of the fishbones. Time-resolved measurements throughout theevolution of a fishbone show radial redistribution of fast ions with energiesup to 95% of the primary beam injection energy. Correlations between changes inthe FIDA signal and the peak time derivative of the magnetic field perturbationare observed in a limited range of operating scenarios. The transient reductionin signal caused by a fishbone may in some cases reach 50% of the signalintensity before mode onset.

Fast-Ion Deuterium Alpha spectroscopic observations of the effects of fishbones in the Mega-Ampere Spherical Tokamak