The role of divertor collisionality on SOL transport: A study on the ITER stepladder

D. Carralero, H.W. Müller, M. Groth, M. Komm, J. Adamek, Leena Aho-Mantila, G. Birkenmeier, M. Brix, F. Jankyc, P. Hacek, S. Marsen, F. Reymold, C. Silva, U. Stroth, M. Wischmeier, E. Wolfrum, ASDEX Update Group, JET Contributors

    Research output: Contribution to journalOther journal contributionScientific

    Abstract

    The L-mode SOL density transition is experimentally investigated in three tokamaks of the ITER stepladder (COMPASS, AUG and JET). The results confirm the relevance of divertor detachment in the SOL profile transition: Both AUG and JET show significant changes in the outer midplane density profiles and increase in the size and velocity of filaments at the same densities in which the LFS divertor surpasses its ion saturation roll-over. Meanwhile, the COMPASS divertor remains attached and no clear signs of transition are observed in the midplane. Furthermore, according to a filament model by Myra et al., only the changes of collisionality in the divertor are sufficient to trigger the transition in both cases. An extrapolation from these results indicates that this broadening is to be expected in ITER despite having a collisionless SOL in the main chamber, since the disconnection of filaments will take place in the partially detached divertor.
    Original languageEnglish
    Article numberTO3.00005
    Number of pages1
    JournalBulletin of the American Physical Society
    Volume59
    Issue number15
    Publication statusPublished - 2014
    MoE publication typeB1 Article in a scientific magazine
    Event56th Annual Meeting of the APS Division of Plasma Physics, DDP14 - New Orleans, United States
    Duration: 27 Oct 201431 Oct 2014
    Conference number: 56

    Fingerprint

    COMPASS (programming language)
    filaments
    profiles
    detachment
    extrapolation
    actuators
    chambers
    saturation
    ions

    Cite this

    Carralero, D., Müller, H. W., Groth, M., Komm, M., Adamek, J., Aho-Mantila, L., ... JET Contributors (2014). The role of divertor collisionality on SOL transport: A study on the ITER stepladder. Bulletin of the American Physical Society, 59(15), [TO3.00005].
    Carralero, D. ; Müller, H.W. ; Groth, M. ; Komm, M. ; Adamek, J. ; Aho-Mantila, Leena ; Birkenmeier, G. ; Brix, M. ; Jankyc, F. ; Hacek, P. ; Marsen, S. ; Reymold, F. ; Silva, C. ; Stroth, U. ; Wischmeier, M. ; Wolfrum, E. ; ASDEX Update Group ; JET Contributors. / The role of divertor collisionality on SOL transport : A study on the ITER stepladder. In: Bulletin of the American Physical Society. 2014 ; Vol. 59, No. 15.
    @article{1c01de45a89548acbbd13f37a86bf109,
    title = "The role of divertor collisionality on SOL transport: A study on the ITER stepladder",
    abstract = "The L-mode SOL density transition is experimentally investigated in three tokamaks of the ITER stepladder (COMPASS, AUG and JET). The results confirm the relevance of divertor detachment in the SOL profile transition: Both AUG and JET show significant changes in the outer midplane density profiles and increase in the size and velocity of filaments at the same densities in which the LFS divertor surpasses its ion saturation roll-over. Meanwhile, the COMPASS divertor remains attached and no clear signs of transition are observed in the midplane. Furthermore, according to a filament model by Myra et al., only the changes of collisionality in the divertor are sufficient to trigger the transition in both cases. An extrapolation from these results indicates that this broadening is to be expected in ITER despite having a collisionless SOL in the main chamber, since the disconnection of filaments will take place in the partially detached divertor.",
    author = "D. Carralero and H.W. M{\"u}ller and M. Groth and M. Komm and J. Adamek and Leena Aho-Mantila and G. Birkenmeier and M. Brix and F. Jankyc and P. Hacek and S. Marsen and F. Reymold and C. Silva and U. Stroth and M. Wischmeier and E. Wolfrum and {ASDEX Update Group} and {JET Contributors}",
    note = "CA2: BA2121",
    year = "2014",
    language = "English",
    volume = "59",
    journal = "Bulletin of the American Physical Society",
    issn = "0003-0503",
    publisher = "American Physical Society",
    number = "15",

    }

    Carralero, D, Müller, HW, Groth, M, Komm, M, Adamek, J, Aho-Mantila, L, Birkenmeier, G, Brix, M, Jankyc, F, Hacek, P, Marsen, S, Reymold, F, Silva, C, Stroth, U, Wischmeier, M, Wolfrum, E, ASDEX Update Group & JET Contributors 2014, 'The role of divertor collisionality on SOL transport: A study on the ITER stepladder', Bulletin of the American Physical Society, vol. 59, no. 15, TO3.00005.

    The role of divertor collisionality on SOL transport : A study on the ITER stepladder. / Carralero, D.; Müller, H.W.; Groth, M.; Komm, M.; Adamek, J.; Aho-Mantila, Leena; Birkenmeier, G.; Brix, M.; Jankyc, F.; Hacek, P.; Marsen, S.; Reymold, F.; Silva, C.; Stroth, U.; Wischmeier, M.; Wolfrum, E.; ASDEX Update Group; JET Contributors.

    In: Bulletin of the American Physical Society, Vol. 59, No. 15, TO3.00005, 2014.

    Research output: Contribution to journalOther journal contributionScientific

    TY - JOUR

    T1 - The role of divertor collisionality on SOL transport

    T2 - A study on the ITER stepladder

    AU - Carralero, D.

    AU - Müller, H.W.

    AU - Groth, M.

    AU - Komm, M.

    AU - Adamek, J.

    AU - Aho-Mantila, Leena

    AU - Birkenmeier, G.

    AU - Brix, M.

    AU - Jankyc, F.

    AU - Hacek, P.

    AU - Marsen, S.

    AU - Reymold, F.

    AU - Silva, C.

    AU - Stroth, U.

    AU - Wischmeier, M.

    AU - Wolfrum, E.

    AU - ASDEX Update Group

    AU - JET Contributors

    N1 - CA2: BA2121

    PY - 2014

    Y1 - 2014

    N2 - The L-mode SOL density transition is experimentally investigated in three tokamaks of the ITER stepladder (COMPASS, AUG and JET). The results confirm the relevance of divertor detachment in the SOL profile transition: Both AUG and JET show significant changes in the outer midplane density profiles and increase in the size and velocity of filaments at the same densities in which the LFS divertor surpasses its ion saturation roll-over. Meanwhile, the COMPASS divertor remains attached and no clear signs of transition are observed in the midplane. Furthermore, according to a filament model by Myra et al., only the changes of collisionality in the divertor are sufficient to trigger the transition in both cases. An extrapolation from these results indicates that this broadening is to be expected in ITER despite having a collisionless SOL in the main chamber, since the disconnection of filaments will take place in the partially detached divertor.

    AB - The L-mode SOL density transition is experimentally investigated in three tokamaks of the ITER stepladder (COMPASS, AUG and JET). The results confirm the relevance of divertor detachment in the SOL profile transition: Both AUG and JET show significant changes in the outer midplane density profiles and increase in the size and velocity of filaments at the same densities in which the LFS divertor surpasses its ion saturation roll-over. Meanwhile, the COMPASS divertor remains attached and no clear signs of transition are observed in the midplane. Furthermore, according to a filament model by Myra et al., only the changes of collisionality in the divertor are sufficient to trigger the transition in both cases. An extrapolation from these results indicates that this broadening is to be expected in ITER despite having a collisionless SOL in the main chamber, since the disconnection of filaments will take place in the partially detached divertor.

    M3 - Other journal contribution

    VL - 59

    JO - Bulletin of the American Physical Society

    JF - Bulletin of the American Physical Society

    SN - 0003-0503

    IS - 15

    M1 - TO3.00005

    ER -