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

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 journal › Other journal contribution › Scientific

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 language	English
Article number	TO3.00005
Number of pages	1
Journal	Bulletin of the American Physical Society: Series II
Volume	59
Issue number	15
Publication status	Published - 2014
MoE publication type	Not Eligible
Event	56th Annual Meeting of the APS Division of Plasma Physics, DDP14 - New Orleans, United States Duration: 27 Oct 2014 → 31 Oct 2014 Conference number: 56

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Carralero, D., Müller, H. W., 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: Series II, 59(15), Article TO3.00005. http://meeting.aps.org/Meeting/DPP14/Session/TO3.5

@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}",

year = "2014",

language = "English",

volume = "59",

journal = "Bulletin of the American Physical Society: Series II",

issn = "0003-0503",

publisher = "American Physical Society (APS)",

number = "15",

note = "56th Annual Meeting of the APS Division of Plasma Physics, DDP14, DDP14 ; Conference date: 27-10-2014 Through 31-10-2014",

}

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: Series II, vol. 59, no. 15, TO3.00005. <http://meeting.aps.org/Meeting/DPP14/Session/TO3.5>

TY - JOUR

T1 - The role of divertor collisionality on SOL transport

T2 - 56th Annual Meeting of the APS Division of Plasma Physics, DDP14

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 - Conference code: 56

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

SN - 0003-0503

VL - 59

JO - Bulletin of the American Physical Society: Series II

JF - Bulletin of the American Physical Society: Series II

IS - 15

M1 - TO3.00005

Y2 - 27 October 2014 through 31 October 2014

ER -

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

Abstract

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