Disruptive locked mode instability after the l-h transition in the compass tokamak

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F24%3A00616844" target="_blank" >RIV/61389021:_____/24:00616844 - isvavai.cz</a>
Result on the web
<a href="https://ojs.cvut.cz/ojs/index.php/PPT/article/view/9980/7184" target="_blank" >https://ojs.cvut.cz/ojs/index.php/PPT/article/view/9980/7184</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Disruptive locked mode instability after the l-h transition in the compass tokamak
Original language description
Much effort has already been devoted to predicting the sensitivity of tokamaks to small asymmetric error fields (EFs), which are unavoidable in tokamak design and can drive dangerous locked-mode (LM) instabilities even at 0.1% amplitude. However, our experiments on COMPASS were the first to show that the threshold for triggering a LM during a transient phase of a tokamak discharge is much lower than in a steady state. This was observed for n=1 EF activated before the L-H transition at the ITER baseline plasma edge helicity. A threshold for EF penetration subsequent to the L-H transition is robustly obtained, showing no significant trend with density or applied external torque, and is explained by the reduced intrinsic rotation of the 2/1 mode during the transient. This finding cautions against using any parametric EF penetration scaling derived from steady-state experiments to define the error field correction strategy for the entire discharge.
Czech name
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Czech description
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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