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SUMMARY:"Experimental and Gyrokinetic Studies of Multi-Channel Transport i
 n the Core of Alcator C-Mod Plasmas"
DTSTART:20130125T103000
DTEND:20130125T113000
DTSTAMP:20260502T115740Z
UID:51dcab02ba46117ead83a55b8f94e17a52d86edb2593d691a3b6657e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. N.T. Howard\, Plasma Science and Fusion Center\, Alcator C
 -Mod Team\, MIT\, Cambridge\, USA\nIn the core of fusion plasmas\, it is g
 enerally accepted that measured levels of heat and particle transport resu
 lt from the presence of low frequency plasma turbulence driven by the plas
 ma’s density and temperature gradients. Identifying what turbulent mode 
 or modes\, such as Ion Temperature Gradient (ITG) or Trapped Electron Mode
  (TEM)\, may be dominantly responsible for the observed transport across a
  wide range of operating parameters is of great interest for enhancing pre
 dictive capability for ITER and beyond. Utilizing a unique set of diagnost
 ic tools on Alcator C-Mod\, electron and ion heat and impurity particle tr
 ansport are investigated in detail. Precise characterization of the spatia
 l and temporal behavior of the full\, time-evolving\, radial profile of no
 n-intrinsic\, trace impurities is possible using a novel multi-pulse laser
  blow-off system coupled with measurements provided by a high resolution x
 -ray crystal spectrometer. These new measurements allow for determination 
 of trace impurity transport inside of r/a=0.6. Additionally\, a newly inst
 alled Correlation Electron Cyclotron Emission (CECE) system is used to cha
 racterize turbulent electron temperature fluctuations\, providing the firs
 t local and quantitative fluctuation measurements in the core of C-Mod pla
 smas. To validate the leading model of plasma microturbulence\, experiment
 al results are rigorously compared with nonlinear gyrokinetic simulations 
 performed using the GYRO code. The fidelity with which empirical trends in
  energy and particle confinement (i.e. scaling with plasma current and hea
 ting power) can be reproduced by GYRO will be discussed in detail\, and gy
 rokinetic analysis of new experiments that probe changes in turbulence and
  transport across the ITG/TEM boundary will be presented.
LOCATION:PPB 019
STATUS:CONFIRMED
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