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Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER
Authors
EA Belli
JA Boedo
+62 more
DP Boyle
BD Bray
JD Callen
J Candy
JM Canik
CS Chang
RM Churchill
I Cziegler
EM Davis
TM Deterly
A Diallo
PH Diamond
EJ Doyle
JD Elder
DP Eldon
DR Ernst
ME Fenstermacher
NM Ferraro
DP Fulton
RJ Groebner
AE Hubbard
JW Hughes
I Joseph
JE Kinsey
B Labombard
M Landreman
CJ Lasnier
AW Leonard
Z Lin
BL Lipschultz
C Liu
JD Lore
Y Ma
R Maingi
GR McKee
TH Osborne
AY Pankin
SE Parker
DM Ponce
TL Rhodes
JC Rost
L Schmitz
SP Smith
PB Snyder
AC Sontag
WM Stacey
GM Staebler
LE Sugiyama
JL Terry
MV Umansky
J Walk
RE Waltz
W Wan
EHJ Wang
JG Watkins
AE White
DG Whyte
SM Wolfe
XQ Xu
Z Yan
L Zeng
SJ Zweben
Publication date
1 September 2013
Publisher
eScholarship, University of California
Abstract
Joint experiment/theory/modelling research has led to increased confidence in predictions of the pedestal height in ITER. This work was performed as part of a US Department of Energy Joint Research Target in FY11 to identify physics processes that control the H-mode pedestal structure. The study included experiments on C-Mod, DIII-D and NSTX as well as interpretation of experimental data with theory-based modelling codes. This work provides increased confidence in the ability of models for peeling-ballooning stability, bootstrap current, pedestal width and pedestal height scaling to make correct predictions, with some areas needing further work also being identified. A model for pedestal pressure height has made good predictions in existing machines for a range in pressure of a factor of 20. This provides a solid basis for predicting the maximum pedestal pressure height in ITER, which is found to be an extrapolation of a factor of 3 beyond the existing data set. Models were studied for a number of processes that are proposed to play a role in the pedestal ne and Te profiles. These processes include neoclassical transport, paleoclassical transport, electron temperature gradient turbulence and neutral fuelling. All of these processes may be important, with the importance being dependent on the plasma regime. Studies with several electromagnetic gyrokinetic codes show that the gradients in and on top of the pedestal can drive a number of instabilities. © 2013 IAEA, Vienna
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Last time updated on 25/12/2021