Speaker
Mr
Anthony Leonard
(General Atomics)
Description
A comparison of experiment and modeling of detached divertor plasmas in DIII-D is examined in the context of parallel energy transport due to electron conduction and plasma convection in order to validate and improve models used for divertor design. Power balance analysis is carried out to determine parallel heat flux and energy dissipation as a function of distance from the divertor target. The relative fractions of conductive and convective heat flux are determined from Thomson scattering measurements of the divertor parallel Te gradient. Modeling with the fluid code SOLPS is found to underestimate divertor heat flux radiative dissipation due to two effects, 1) lower values of parallel convection than inferred from experiment and 2) lower impurity radiation than measured experimentally at similar values of Te. Resolution of these discrepancies is expected to improve accuracy and confidence for predictive modeling of divertor operation in future devices.
Work supported by the US DOE under DE-FC02-04ER54698, DE-AC52-07NA27344, DE-FG02-07ER54917, DE-AC05-00OR22725, DE-AC02-09CH11466, and DE-AC04-94AL85000.
| Country or International Organization | United States of America |
|---|---|
| Paper Number | EX/P6-12 |
Primary author
Mr
Anthony Leonard
(General Atomics)
Co-authors
Mr
Adam McLean
(Lawrence Livermore National Laboratory)
Mr
Huiqian Wang
(Oak Ridge Associated Universities)
Mr
Jeremy Lore
(Oak Ridge National Laboratory)
Mr
John Canik
(Oak Ridge National Laboratory)
Mr
Jon Watkins
(Sandia National Laboratory)
Mr
Jose Boedo
(University of California San Diego)
Mr
Mathias Groth
(Aalto University)
Mr
Steve Allen
(Lawrence Livermore National Laboratory)
