On the evolution of profiles and fluctuations towards the L-mode density limit in ASDEX Upgrade
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00645980" target="_blank" >RIV/61389021:_____/25:00645980 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1741-4326/adeda1" target="_blank" >https://iopscience.iop.org/article/10.1088/1741-4326/adeda1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1741-4326/adeda1" target="_blank" >10.1088/1741-4326/adeda1</a>
Alternative languages
Result language
angličtina
Original language name
On the evolution of profiles and fluctuations towards the L-mode density limit in ASDEX Upgrade
Original language description
The maximum achievable density in a tokamak is restricted by the so-called density limit. In this contribution, we observe that a MARFE precedes the final chain of events leading to disruption in ramp up L-mode discharges, resulting in strong power dissipation and plasma cooling, which likely makes the plasma unstable to MHD modes. However, this phase is preceded by an initial cooling governed by enhanced radial transport due to higher fluctuations and a more favorable cross-phase for transport, which likely impacts the MARFE formation. The increase in radial turbulent transport near the separatrix is primarily observed following the detachment of the outer divertor. This occurs when an X-point radiator forms and the edge collisionality rises, indicating that the increased collisionality influences the turbulence characteristics in the plasma boundary. The causal connection between the events that precede the disruption is discussed.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nuclear Fusion
ISSN
0029-5515
e-ISSN
1741-4326
Volume of the periodical
65
Issue of the periodical within the volume
8
Country of publishing house
US - UNITED STATES
Number of pages
21
Pages from-to
086023
UT code for WoS article
001531168300001
EID of the result in the Scopus database
2-s2.0-105011209262