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Title: Current understanding of divertor detachment: experiments and modelling

Abstract

A qualitative as well as quantitative evaluation of experimentally observed plasma parameters in the detached regime proves to be difficult for several tokamaks. A series of ohmic discharges have been performed in ASDEX Upgrade and DIII-D at similar as possible plasma parameters and at different line averaged densities, {bar n}{sub e}. The experimental data represent a set of well diagnosed discharges against which numerical simulations are compared. For the numerical modeling the fluid-code B2.5 coupled to the Monte Carlo neutrals transport code EIRENE is used. Only the combined enhancement of effects, such as geometry, drift terms, neutral conductance, increased radial transport and divertor target composition, explains a significant fraction of the experimentally observed asymmetries of the ion fluxes as a function of {bar n}{sub e} to the inner and outer target plates in ASDEX Upgrade. The relative importance of the mechanisms leading to detachment are different in DIII-D and ASDEX Upgrade.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
945714
Report Number(s):
LLNL-CONF-404179
TRN: US0901076
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 18th Conference on Plasma Surface Interactions, Toledo, Spain, May 26 - May 30, 2008
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; DIVERTORS; DOUBLET-3 DEVICE; EVALUATION; GEOMETRY; PLASMA; PLATES; SIMULATION; TARGETS; TRANSPORT

Citation Formats

Wischmeier, W, Groth, M, Kallenbach, A, Chankin, A, Coster, D, Dux, R, Herrmann, A, Muller, H, Pugno, R, Reiter, D, Scarabosio, A, Watkins, J, Team, T D, and Team, A U. Current understanding of divertor detachment: experiments and modelling. United States: N. p., 2008. Web.
Wischmeier, W, Groth, M, Kallenbach, A, Chankin, A, Coster, D, Dux, R, Herrmann, A, Muller, H, Pugno, R, Reiter, D, Scarabosio, A, Watkins, J, Team, T D, & Team, A U. Current understanding of divertor detachment: experiments and modelling. United States.
Wischmeier, W, Groth, M, Kallenbach, A, Chankin, A, Coster, D, Dux, R, Herrmann, A, Muller, H, Pugno, R, Reiter, D, Scarabosio, A, Watkins, J, Team, T D, and Team, A U. Fri . "Current understanding of divertor detachment: experiments and modelling". United States. https://www.osti.gov/servlets/purl/945714.
@article{osti_945714,
title = {Current understanding of divertor detachment: experiments and modelling},
author = {Wischmeier, W and Groth, M and Kallenbach, A and Chankin, A and Coster, D and Dux, R and Herrmann, A and Muller, H and Pugno, R and Reiter, D and Scarabosio, A and Watkins, J and Team, T D and Team, A U},
abstractNote = {A qualitative as well as quantitative evaluation of experimentally observed plasma parameters in the detached regime proves to be difficult for several tokamaks. A series of ohmic discharges have been performed in ASDEX Upgrade and DIII-D at similar as possible plasma parameters and at different line averaged densities, {bar n}{sub e}. The experimental data represent a set of well diagnosed discharges against which numerical simulations are compared. For the numerical modeling the fluid-code B2.5 coupled to the Monte Carlo neutrals transport code EIRENE is used. Only the combined enhancement of effects, such as geometry, drift terms, neutral conductance, increased radial transport and divertor target composition, explains a significant fraction of the experimentally observed asymmetries of the ion fluxes as a function of {bar n}{sub e} to the inner and outer target plates in ASDEX Upgrade. The relative importance of the mechanisms leading to detachment are different in DIII-D and ASDEX Upgrade.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {5}
}

Conference:
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