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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-9405
DTSTART:20251111T150000Z
DTEND:20251111T170000Z
DTSTAMP:20260413T084029Z
LAST-MODIFIED:20251106T144820Z
LOCATION:B343 Sterling Hall
SUMMARY:Instability Saturation and Turbulent Dynamos in Shear Flows\, 
 Thesis Defense\, Bindesh Tripathi
DESCRIPTION:Instabilities in nature drive turbulence\, which impedes f
 usion-energy gain in reactors and impacts cosmic observables such as m
 agnetic fields and multi-messenger-astronomy signals.   To understand 
 the underlying turbulent processes\, this thesis investigates two cent
 ral questions:   How instabilities may saturate\, and how turbulence m
 ay generate astrophysical magnetic fields at large scales—a process 
 called the dynamo.   Previous efforts to address the former have relie
 d exclusively on an energy cascade to microphysical scales and thus mi
 ssed critical elements of instability-scale mode-couplings.   Dynamo e
 fforts have been frustrated because large-scale magnetic-field generat
 ion is suppressed via Alfvénization—a robust magnetohydrodynamic pr
 ocess that aligns fluctuations in the fluid velocity u with those in t
 he magnetic field b\, i.e.\, u||b.   Addressing these challenges\, thi
 s thesis develops fundamental principles of instability saturation and
  applies them to demonstrate a novel mechanism where Alfvénization ge
 nerates magnetic fields\, instead of suppressing the fields.   These f
 indings\, organized in three parts\, apply to shear flows driven unsta
 ble by their velocity gradients.
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URL:https://www.physics.wisc.edu/events/?id=9405
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