Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition

R. Pugno (Corresponding Author), K. Krieger, A. Kirschner, A. Kallenbach, D.P. Coster, R. Dux, U. Fantz, Jari Likonen, H.W. Müller, J. Neuhauser, V. Rohde, Elizaveta Vainonen-Ahlgren, ASDEX Upgrade Team

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)

    Abstract

    Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.
    Original languageEnglish
    Pages (from-to)985 - 989
    Number of pages5
    JournalJournal of Nuclear Materials
    Volume337-339
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    erosion
    Erosion
    Carbon
    Fluxes
    carbon
    Nuclear reactions
    Deuterium
    Methane
    Emission spectroscopy
    nuclear reactions
    deuterium
    methane
    exponents
    Ions
    Magnetic fields
    Hydrogen
    magnetic fields
    spectroscopy
    ions
    Temperature

    Keywords

    • ASDEX upgrade
    • chemical erosion
    • erosion
    • deposition
    • spectroscopy
    • surface analysis
    • ITER
    • JET
    • fusion energy

    Cite this

    Pugno, R., Krieger, K., Kirschner, A., Kallenbach, A., Coster, D. P., Dux, R., ... ASDEX Upgrade Team (2005). Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition. Journal of Nuclear Materials, 337-339, 985 - 989. https://doi.org/10.1016/j.jnucmat.2004.09.053
    Pugno, R. ; Krieger, K. ; Kirschner, A. ; Kallenbach, A. ; Coster, D.P. ; Dux, R. ; Fantz, U. ; Likonen, Jari ; Müller, H.W. ; Neuhauser, J. ; Rohde, V. ; Vainonen-Ahlgren, Elizaveta ; ASDEX Upgrade Team. / Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb : Flux dependence and local redeposition. In: Journal of Nuclear Materials. 2005 ; Vol. 337-339. pp. 985 - 989.
    @article{33547e690a3f41589bd7905fc97344d5,
    title = "Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition",
    abstract = "Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.",
    keywords = "ASDEX upgrade, chemical erosion, erosion, deposition, spectroscopy, surface analysis, ITER, JET, fusion energy",
    author = "R. Pugno and K. Krieger and A. Kirschner and A. Kallenbach and D.P. Coster and R. Dux and U. Fantz and Jari Likonen and H.W. M{\"u}ller and J. Neuhauser and V. Rohde and Elizaveta Vainonen-Ahlgren and {ASDEX Upgrade Team}",
    year = "2005",
    doi = "10.1016/j.jnucmat.2004.09.053",
    language = "English",
    volume = "337-339",
    pages = "985 -- 989",
    journal = "Journal of Nuclear Materials",
    issn = "0022-3115",
    publisher = "Elsevier",

    }

    Pugno, R, Krieger, K, Kirschner, A, Kallenbach, A, Coster, DP, Dux, R, Fantz, U, Likonen, J, Müller, HW, Neuhauser, J, Rohde, V, Vainonen-Ahlgren, E & ASDEX Upgrade Team 2005, 'Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition', Journal of Nuclear Materials, vol. 337-339, pp. 985 - 989. https://doi.org/10.1016/j.jnucmat.2004.09.053

    Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb : Flux dependence and local redeposition. / Pugno, R. (Corresponding Author); Krieger, K.; Kirschner, A.; Kallenbach, A.; Coster, D.P.; Dux, R.; Fantz, U.; Likonen, Jari; Müller, H.W.; Neuhauser, J.; Rohde, V.; Vainonen-Ahlgren, Elizaveta; ASDEX Upgrade Team.

    In: Journal of Nuclear Materials, Vol. 337-339, 2005, p. 985 - 989.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb

    T2 - Flux dependence and local redeposition

    AU - Pugno, R.

    AU - Krieger, K.

    AU - Kirschner, A.

    AU - Kallenbach, A.

    AU - Coster, D.P.

    AU - Dux, R.

    AU - Fantz, U.

    AU - Likonen, Jari

    AU - Müller, H.W.

    AU - Neuhauser, J.

    AU - Rohde, V.

    AU - Vainonen-Ahlgren, Elizaveta

    AU - ASDEX Upgrade Team, null

    PY - 2005

    Y1 - 2005

    N2 - Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.

    AB - Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.

    KW - ASDEX upgrade

    KW - chemical erosion

    KW - erosion

    KW - deposition

    KW - spectroscopy

    KW - surface analysis

    KW - ITER

    KW - JET

    KW - fusion energy

    U2 - 10.1016/j.jnucmat.2004.09.053

    DO - 10.1016/j.jnucmat.2004.09.053

    M3 - Article

    VL - 337-339

    SP - 985

    EP - 989

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    ER -