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CATEGORIES:Conferences/Seminars/Lectures
DESCRIPTION:The Del Favero Thesis Prize\, established in 2014 with a genero
 us gift from alum James Del Favero (SM ’84)\, is awarded to a PhD graduate 
 in NSE whose thesis is judged to have made the most innovative advance in o
 ur field. \n\nPlease join us as 2019 award winner Pablo Rodriguez Fernadez'
 s presents his lecture\, "Heating by cooling: Perturbing fusion plasmas to 
 predict SPARC performance."\n\nHeating by cooling: Perturbing fusion plasma
 s to predict SPARC performance\n\nABSTRACT: Perturbative transport experime
 nts in magnetically confined plasmas have shown\, for more than 20 years\, 
 that the injection of cold pulses at the plasma edge can trigger the fast i
 ncrease of core temperature. Because no single standard local transport mod
 el tried to date has been able to reproduce satisfactorily all the observed
  temporal behavior in the experiments\, these transient transport phenomena
  feature prominently as an open question in the community and as a challeng
 e for predictive capabilities in tokamak burning plasmas\, such as ITER and
  SPARC.\n\nFor the first time after more than two decades of experimental e
 vidence\, this Thesis resolves this long-standing enigma in plasma transpor
 t\, by modeling of experiments conducted on the Alcator C-Mod and DIII-D to
 kamaks. Predictive integrated simulations with the Trapped Gyro Landau Flui
 d (TGLF) quasilinear transport model demonstrate that the increase of core 
 temperature in some regimes\, and lack thereof in other regimes\, can be ex
 plained by a change in dominant linear micro-instability in the plasma core
 . The effect of major radius\, electron density and plasma current on the c
 old pulse are well captured by TGLF\, including the relative change in posi
 tion of the temperature flex point as current density changes. Linear stabi
 lity analysis of simulated density and current scans in Alcator C-Mod revea
 ls a competition between trapped electron and ion temperature gradient mode
 s as the main driver of the core transient response. Measurements of electr
 on density evolution during the cold-pulse propagation in DIII-D are enable
 d by a high time resolution density profile reflectometer. The density evol
 ution reveals the quick propagation of a pulse from edge to core\, which is
  the mechanism to transiently increase core temperature in low-collisionali
 ty plasmas. The work presented in this Thesis demonstrates that the existen
 ce of nonlocal heat transport phenomena is not necessary for explaining the
  behavior and time scales of cold-pulse experiments in tokamak plasmas.
DTEND:20191205T220000Z
DTSTAMP:20260417T120420Z
DTSTART:20191205T200000Z
LOCATION:3-270
SEQUENCE:0
SUMMARY:2019 Del Favero Award Lecture - Pablo Rodriguez Fernadez
UID:tag:localist.com\,2008:EventInstance_31554754546694
URL:https://calendar.mit.edu/event/2019_del_favero_award_lecture_-_pablo_ro
 driguez_fernadez
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