Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade

Felix Reimold, Matthias Bernert, Arne Kallenbach, Steffen Pozel, Marco Wischmeier, A. Scarabosio, D. Coster, Leena Aho-Mantila, ASDEX Upgrade Team

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Detached divertor operation in H-Mode is essential for future fusion reactors to be able to handle the occuring power fluxes into the divertor and to avoid major material erosion of the divertor targets. Complete detachment is characterized by a substantial reduction of plasma pressure along a fieldline from midplane to target across the whole Scrape-Off Layer.

Complete detachment has only been observed at the inner target in the boronized full-tungsten wall tokamak ASDEX Upgrade so far. Recently, stable H-Mode operation with a completely detached plasma at both divertor targets has been achieved by significant nitrogen seeding. The pressure loss along the field line exceeded a factor of ten and the power flux was effectively reduced to negligible levels at both targets simultaneously. Tungsten sputtering at the targets is strongly reduced during detached plasma operation.

This contribution will highlight the experimental results and show the accessible operational space for nitrogen induced detachment in H-Mode. Accompanying SOLPS-modeling of the detachment process will be presented.
Original languageEnglish
Title of host publicationDPG-Frühjahrstagung Jena 2013
ChapterP: Fachverband Plasmaphysik
Publication statusPublished - 2013
EventDPG-Frühjahrstagung Jena 2013 - Jena, Germany
Duration: 25 Feb 20131 Mar 2013

Conference

ConferenceDPG-Frühjahrstagung Jena 2013
CountryGermany
CityJena
Period25/02/131/03/13

Fingerprint

detachment
tungsten
nitrogen
plasma pressure
fusion reactors
inoculation
erosion
sputtering

Cite this

Reimold, F., Bernert, M., Kallenbach, A., Pozel, S., Wischmeier, M., Scarabosio, A., ... ASDEX Upgrade Team (2013). Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade. In DPG-Frühjahrstagung Jena 2013 [P6.3]
Reimold, Felix ; Bernert, Matthias ; Kallenbach, Arne ; Pozel, Steffen ; Wischmeier, Marco ; Scarabosio, A. ; Coster, D. ; Aho-Mantila, Leena ; ASDEX Upgrade Team. / Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade. DPG-Frühjahrstagung Jena 2013. 2013.
@inbook{6a1ddf0c89be486aae394df6973a52a2,
title = "Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade",
abstract = "Detached divertor operation in H-Mode is essential for future fusion reactors to be able to handle the occuring power fluxes into the divertor and to avoid major material erosion of the divertor targets. Complete detachment is characterized by a substantial reduction of plasma pressure along a fieldline from midplane to target across the whole Scrape-Off Layer.Complete detachment has only been observed at the inner target in the boronized full-tungsten wall tokamak ASDEX Upgrade so far. Recently, stable H-Mode operation with a completely detached plasma at both divertor targets has been achieved by significant nitrogen seeding. The pressure loss along the field line exceeded a factor of ten and the power flux was effectively reduced to negligible levels at both targets simultaneously. Tungsten sputtering at the targets is strongly reduced during detached plasma operation.This contribution will highlight the experimental results and show the accessible operational space for nitrogen induced detachment in H-Mode. Accompanying SOLPS-modeling of the detachment process will be presented.",
author = "Felix Reimold and Matthias Bernert and Arne Kallenbach and Steffen Pozel and Marco Wischmeier and A. Scarabosio and D. Coster and Leena Aho-Mantila and {ASDEX Upgrade Team}",
note = "CA2: TK202 SDA: ENE",
year = "2013",
language = "English",
booktitle = "DPG-Fr{\"u}hjahrstagung Jena 2013",

}

Reimold, F, Bernert, M, Kallenbach, A, Pozel, S, Wischmeier, M, Scarabosio, A, Coster, D, Aho-Mantila, L & ASDEX Upgrade Team 2013, Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade. in DPG-Frühjahrstagung Jena 2013., P6.3, DPG-Frühjahrstagung Jena 2013, Jena, Germany, 25/02/13.

Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade. / Reimold, Felix; Bernert, Matthias; Kallenbach, Arne; Pozel, Steffen; Wischmeier, Marco; Scarabosio, A.; Coster, D.; Aho-Mantila, Leena; ASDEX Upgrade Team.

DPG-Frühjahrstagung Jena 2013. 2013. P6.3.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade

AU - Reimold, Felix

AU - Bernert, Matthias

AU - Kallenbach, Arne

AU - Pozel, Steffen

AU - Wischmeier, Marco

AU - Scarabosio, A.

AU - Coster, D.

AU - Aho-Mantila, Leena

AU - ASDEX Upgrade Team

N1 - CA2: TK202 SDA: ENE

PY - 2013

Y1 - 2013

N2 - Detached divertor operation in H-Mode is essential for future fusion reactors to be able to handle the occuring power fluxes into the divertor and to avoid major material erosion of the divertor targets. Complete detachment is characterized by a substantial reduction of plasma pressure along a fieldline from midplane to target across the whole Scrape-Off Layer.Complete detachment has only been observed at the inner target in the boronized full-tungsten wall tokamak ASDEX Upgrade so far. Recently, stable H-Mode operation with a completely detached plasma at both divertor targets has been achieved by significant nitrogen seeding. The pressure loss along the field line exceeded a factor of ten and the power flux was effectively reduced to negligible levels at both targets simultaneously. Tungsten sputtering at the targets is strongly reduced during detached plasma operation.This contribution will highlight the experimental results and show the accessible operational space for nitrogen induced detachment in H-Mode. Accompanying SOLPS-modeling of the detachment process will be presented.

AB - Detached divertor operation in H-Mode is essential for future fusion reactors to be able to handle the occuring power fluxes into the divertor and to avoid major material erosion of the divertor targets. Complete detachment is characterized by a substantial reduction of plasma pressure along a fieldline from midplane to target across the whole Scrape-Off Layer.Complete detachment has only been observed at the inner target in the boronized full-tungsten wall tokamak ASDEX Upgrade so far. Recently, stable H-Mode operation with a completely detached plasma at both divertor targets has been achieved by significant nitrogen seeding. The pressure loss along the field line exceeded a factor of ten and the power flux was effectively reduced to negligible levels at both targets simultaneously. Tungsten sputtering at the targets is strongly reduced during detached plasma operation.This contribution will highlight the experimental results and show the accessible operational space for nitrogen induced detachment in H-Mode. Accompanying SOLPS-modeling of the detachment process will be presented.

M3 - Conference abstract in proceedings

BT - DPG-Frühjahrstagung Jena 2013

ER -

Reimold F, Bernert M, Kallenbach A, Pozel S, Wischmeier M, Scarabosio A et al. Experimental Results and SOLPS-Modeling of H-Mode Detachment in full-tungsten ASDEX Upgrade. In DPG-Frühjahrstagung Jena 2013. 2013. P6.3