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

The characteristic profile and magnitude are predicted in theory for theneoclassical toroidal viscosity (NTV) torque induced by plasma response to theresonant magnetic perturbation (RMP) in a tokamak with an edge pedestal. For alow-$\beta$ equilibrium, the NTV torque is dominated by the toroidal componentwith the same dominant toroidal mode number of RMP. The NTV torque profile isfound to be localized, whose peak location is determined by profiles of boththe equilibrium temperature (pressure) and the plasma response. In general, thepeak of NTV torque profile is found to track the pedestal position. Themagnitude of NTV torque strongly depends on the $\beta$ value of pedestal,which suggests a more significant role of NTV torque in higher plasma $\beta$regimes. For a fixed plasma $\beta$, decreasing density hence increasingtemperature can also enhance the amplitude of NTV torque due to the reducedcollisionality in the $1/\nu$ regime. Based on those findings, we identify thetokamak operation regimes where the significance of NTV torque in edge pedestalinduced by RMP can approach those from other momentum sources such as theneutral beam injections.

Neoclassical toroidal viscosity torque in tokamak edge pedestal induced by external resonant magnetic perturbation