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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
Journal ID: ISSN 0022-3115; TRN: US0901076
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 390-391; 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. doi:10.1016/j.jnucmat.2009.01.081.
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. https://doi.org/10.1016/j.jnucmat.2009.01.081
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. 2008. "Current understanding of divertor detachment: experiments and modelling". United States. https://doi.org/10.1016/j.jnucmat.2009.01.081. 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 = {10.1016/j.jnucmat.2009.01.081},
url = {https://www.osti.gov/biblio/945714}, journal = {},
issn = {0022-3115},
number = ,
volume = 390-391,
place = {United States},
year = {Fri May 23 00:00:00 EDT 2008},
month = {Fri May 23 00:00:00 EDT 2008}
}

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Works referenced in this record:

Progress in the ITER Physics Basis
journal, June 2007


Radiation Absorption Effects in B2-EIRENE Divertor Modelling
journal, September 2006


Simulating the Role of Intrinsic Carbon Impurities in the Divertor Detachment of ASDEX Upgrade
journal, March 2008


Measurements of neutral gas fluxes under different plasma and divertor regimes in ASDEX Upgrade
journal, June 2009


Main chamber high recycling on ASDEX upgrade
journal, June 2009


Plasma recombination and divertor detachment
journal, May 1996


Plasma recombination and molecular effects in tokamak divertors and divertor simulators
journal, May 1997


The influence of molecular dynamics on divertor detachment in TCV
journal, April 2004


Hydrogen molecules in the divertor of ASDEX Upgrade
journal, March 2001


Divertor modelling of septum assessment experiments in JET MkIIGB
journal, April 2004


The effect of detachment on carbon divertor erosion/redeposition in the DIII-D tokamak
journal, September 2001


Edge and divertor physics with reversed toroidal field in JET
journal, March 2005