Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO

F. Subba, L. Aho-Mantila, R. Ambrosino, D.P. Coster, V. Pericoli-Ridolfini, A. Uccello, R. Zanino

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

The standard Single Null (SN) divertor is currently expected to be installed in DEMO. However, a number of alternative configurations are being evaluated in parallel as backup solutions, in case the standard divertor does not extrapolate successfully from ITER to a fusion power plant. We used the SOLPS code to produce a preliminary analysis of two such configurations, the X-Divertor (XD) and the Super X-Divertor (SX), and compare them to the SN solution. Considering the nominal power flowing into the SOL (PSOL = 150 MW), we estimated the amplitude of the acceptable DEMO operational space. The acceptability criterion was chosen as plasma temperature at the target lower than 5eV, providing low sputtering and at least partial detachment, while the operational space was defined in terms of the electron density at the outboard mid-plane separatrix and of the seeded impurity (Ar only in the present study) concentration. It was found that both the XD and the SXD extend the DEMO operational space, although the advantages detected so far are not dramatic. The most promising configuration seems to be the XD, which can produce acceptable target temperatures at moderate outboard mid-plane electron density (nomp=4.5*1019 m-3) and Zeff = 1.3.
Original languageEnglish
Pages (from-to)967-972
Number of pages6
JournalNuclear Materials and Energy
Volume12
DOIs
Publication statusPublished - 1 Aug 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Carrier concentration
configurations
Sputtering
Power plants
Fusion reactions
Impurities
Plasmas
Temperature
backups
plasma temperature
power plants
detachment
acceptability
fusion
sputtering
impurities
temperature

Keywords

  • advanced divertor
  • DEMO
  • detachment
  • numerical modeling

Cite this

Subba, F., Aho-Mantila, L., Ambrosino, R., Coster, D. P., Pericoli-Ridolfini, V., Uccello, A., & Zanino, R. (2017). Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO. Nuclear Materials and Energy, 12, 967-972. https://doi.org/10.1016/j.nme.2017.04.003
Subba, F. ; Aho-Mantila, L. ; Ambrosino, R. ; Coster, D.P. ; Pericoli-Ridolfini, V. ; Uccello, A. ; Zanino, R. / Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 967-972.
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Subba, F, Aho-Mantila, L, Ambrosino, R, Coster, DP, Pericoli-Ridolfini, V, Uccello, A & Zanino, R 2017, 'Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO', Nuclear Materials and Energy, vol. 12, pp. 967-972. https://doi.org/10.1016/j.nme.2017.04.003

Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO. / Subba, F.; Aho-Mantila, L.; Ambrosino, R.; Coster, D.P.; Pericoli-Ridolfini, V.; Uccello, A.; Zanino, R.

In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 967-972.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO

AU - Subba, F.

AU - Aho-Mantila, L.

AU - Ambrosino, R.

AU - Coster, D.P.

AU - Pericoli-Ridolfini, V.

AU - Uccello, A.

AU - Zanino, R.

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AB - The standard Single Null (SN) divertor is currently expected to be installed in DEMO. However, a number of alternative configurations are being evaluated in parallel as backup solutions, in case the standard divertor does not extrapolate successfully from ITER to a fusion power plant. We used the SOLPS code to produce a preliminary analysis of two such configurations, the X-Divertor (XD) and the Super X-Divertor (SX), and compare them to the SN solution. Considering the nominal power flowing into the SOL (PSOL = 150 MW), we estimated the amplitude of the acceptable DEMO operational space. The acceptability criterion was chosen as plasma temperature at the target lower than 5eV, providing low sputtering and at least partial detachment, while the operational space was defined in terms of the electron density at the outboard mid-plane separatrix and of the seeded impurity (Ar only in the present study) concentration. It was found that both the XD and the SXD extend the DEMO operational space, although the advantages detected so far are not dramatic. The most promising configuration seems to be the XD, which can produce acceptable target temperatures at moderate outboard mid-plane electron density (nomp=4.5*1019 m-3) and Zeff = 1.3.

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