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

Power exhaust is one of the major challenges for a future fusion device.Applying a non-axisymmetric external magnetic perturbation is one techniquethat is studied in order to mitigate or suppress large edge localized modeswhich accompany the high confinement regime in tokamaks. The external magneticperturbation brakes the axisymmetry of a tokamak and leads to a 2D heat fluxpattern on the divertor target. The 2D heat flux pattern at the outer divertortarget is studied on ASDEX Upgrade in stationary L-Mode discharges. Theamplitude of the 2D characteristic of the heat flux depends on the alignmentbetween the field lines at the edge and the vacuum response of the appliedmagnetic perturbation spectrum. The 2D characteristic reduces with increasingdensity. The increasing divertor broadening $S$ with increasing density isproposed as the main actuator. This is supported by a generic model using fieldline tracing and the vacuum field approach that is in quantitative agreementwith the measured heat flux. The perturbed heat flux, averaged over a fulltoroidal rotation of the magnetic perturbation, is identical to thenon-perturbed heat flux without magnetic perturbation. The transportqualifiers, power fall-off length $\lambda_q$ and divertor broadening $S$, arethe same within the uncertainty compared to the unperturbed reference. Noadditional cross field transport is observed.

Divertor Heat Load in ASDEX Upgrade L-Mode in Presence of External Magnetic Perturbation