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BEGIN:VEVENT
DTSTAMP:20260428T064827Z
DTSTART;VALUE=DATE-TIME:20221124T150000
DTEND;VALUE=DATE-TIME:20221124T160000
SUMMARY:Arnas Volcokas (EPFL\, Switzerland): Self-interaction impact on t
 urbulent transport in tokamaks at very low magnetic shear
TZID:Europe/London
UID:20221124-8a1785d883cbb6ba0183d5ec108a504f@warwick.ac.uk
CREATED:20221121T104447Z
DESCRIPTION:AbstractIn our work\, we use local nonlinear gyrokinetic simu
 lations of tokamaks to demonstrate that turbulent eddies can extend alon
 g magnetic field lines for hundreds of poloidal turns when the magnetic 
 shear is very weak or zero. Their length is limited only by critical bal
 ance — the distance that electrons can travel along the field line withi
 n the lifetime of a turbulent eddy. Such "ultra long" eddies can have si
 gnificant consequences on turbulent transport due to parallel self-inter
 action. Moreover\, it makes correctly treating the field line topology\,
  in particular whether a flux surface has a safety factor that is intege
 r\, rational\, near rational\, or irrational\, all the more important. T
 o this end\, we will show that field line topology can cause transitions
  between different turbulent modes and completely stabilize Ion Temperat
 ure Gradient (ITG) turbulence\, both linearly and nonlinearly. Empirical
 ly\, very weak or zero magnetic shear has been identified as being one o
 f the key conditions for facilitating Internal Transport Barriers (ITBs)
 . We present standard local gyrokinetic simulations that exhibit weak IT
 Bs caused by the magnetic topology\, which may inform a long-standing ex
 perimental observation that it is often easier to trigger ITBs where the
  safety factor has a low-order rational value. Lastly\, we observe a nov
 el physical effect termed ``poloidal eddy squeezing’’ — when eddies beco
 me ultra long they can cover the full flux surface and\, for specific va
 lues of the safety factor\, strongly interact with themselves in the per
 pendicular direction. This can squeeze them\, reducing their perpendicul
 ar size and ability to transport energy\, thereby embodying an intriguin
 g new strategy to improve confinement in tokamaks.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20221121T104447Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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