Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade: Towards modelling of ITER gas injection

W. Zhang; V. Bobkov; J. M. Noterdaeme; W. Tierens; R. Bilato; D. Carralero; D. Coster; J. Jacquot; P. Jacquet; T. Lunt; R. A. Pitts; V. Rohde; G. Siegl; H. Fuenfgelder; D. Aguiam; A. Silva; L. Colas; S. Ceccuzzi

doi:10.1088/1361-6587/aa6fe5

Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade: Towards modelling of ITER gas injection

W. Zhang, V. Bobkov, J. M. Noterdaeme, W. Tierens, R. Bilato, D. Carralero, D. Coster, J. Jacquot, P. Jacquet, T. Lunt, R. A. Pitts, V. Rohde, G. Siegl, H. Fuenfgelder, D. Aguiam, A. Silva, L. Colas, S. Ceccuzzi

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The influence of outer top gas injection on the scrape-off layer (SOL) density and ion cyclotron range of frequency (ICRF) coupling has been studied in ASDEX Upgrade (AUG) L-mode plasmas for the first time. The three-dimensional (3D) edge plasma fluid and neutral transport code EMC3-EIRENE is used to simulate the SOL plasma density, and the 3D wave code RAPLICASOL is used to compute the ICRF coupling resistance with the calculated density. Improvements have been made in the EMC3-EIRENE simulations by fitting transport parameters separately for each gas puffing case. It is found that the calculated local density profiles and coupling resistances are in good agreement with the experimental ones. The results indicate that the SOL density increase depends sensitively on the spreading of the injected outer top gas. If more gas enters into the main chamber through the paths near the top of vessel, the SOL density increase will be more toroidally uniform; if more gas chooses the paths closer to the mid-plane, then the SOL density increase will be more local and more significant. Among the various local gas puffing methods, the mid-plane gas valve close to the antenna is still the best option in terms of improving ICRF coupling. Differences between the outer top gas puffing in AUG and the outer top gas puffing in ITER are briefly summarized. Instructive suggestions for ITER and future plans for ITER gas injection simulations are discussed.

Original language	English
Article number	075004
Journal	Plasma Physics and Controlled Fusion
Volume	59
Issue number	7
DOIs	https://doi.org/10.1088/1361-6587/aa6fe5
State	Published - May 18 2017
Externally published	Yes

Funding

Funders	Funder number
Horizon 2020 Framework Programme	633053

Keywords

3D simulations
ICRF coupling
ITER
gas puffing/fuelling
scrape-off layer

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1361-6587/aa6fe5

Cite this

Zhang, W., Bobkov, V., Noterdaeme, J. M., Tierens, W., Bilato, R., Carralero, D., Coster, D., Jacquot, J., Jacquet, P., Lunt, T., Pitts, R. A., Rohde, V., Siegl, G., Fuenfgelder, H., Aguiam, D., Silva, A., Colas, L., & Ceccuzzi, S. (2017). Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade: Towards modelling of ITER gas injection. Plasma Physics and Controlled Fusion, 59(7), Article 075004. https://doi.org/10.1088/1361-6587/aa6fe5

@article{db42ddfb85664fa0905e20785c00ba0d,

title = "Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade: Towards modelling of ITER gas injection",

abstract = "The influence of outer top gas injection on the scrape-off layer (SOL) density and ion cyclotron range of frequency (ICRF) coupling has been studied in ASDEX Upgrade (AUG) L-mode plasmas for the first time. The three-dimensional (3D) edge plasma fluid and neutral transport code EMC3-EIRENE is used to simulate the SOL plasma density, and the 3D wave code RAPLICASOL is used to compute the ICRF coupling resistance with the calculated density. Improvements have been made in the EMC3-EIRENE simulations by fitting transport parameters separately for each gas puffing case. It is found that the calculated local density profiles and coupling resistances are in good agreement with the experimental ones. The results indicate that the SOL density increase depends sensitively on the spreading of the injected outer top gas. If more gas enters into the main chamber through the paths near the top of vessel, the SOL density increase will be more toroidally uniform; if more gas chooses the paths closer to the mid-plane, then the SOL density increase will be more local and more significant. Among the various local gas puffing methods, the mid-plane gas valve close to the antenna is still the best option in terms of improving ICRF coupling. Differences between the outer top gas puffing in AUG and the outer top gas puffing in ITER are briefly summarized. Instructive suggestions for ITER and future plans for ITER gas injection simulations are discussed.",

keywords = "3D simulations, ICRF coupling, ITER, gas puffing/fuelling, scrape-off layer",

author = "W. Zhang and V. Bobkov and Noterdaeme, {J. M.} and W. Tierens and R. Bilato and D. Carralero and D. Coster and J. Jacquot and P. Jacquet and T. Lunt and Pitts, {R. A.} and V. Rohde and G. Siegl and H. Fuenfgelder and D. Aguiam and A. Silva and L. Colas and S. Ceccuzzi",

note = "Publisher Copyright: {\textcopyright} 2017 EUROfusion Max Planck Institute for Plasma Physics.",

year = "2017",

month = may,

day = "18",

doi = "10.1088/1361-6587/aa6fe5",

language = "English",

volume = "59",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

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Zhang, W, Bobkov, V, Noterdaeme, JM, Tierens, W, Bilato, R, Carralero, D, Coster, D, Jacquot, J, Jacquet, P, Lunt, T, Pitts, RA, Rohde, V, Siegl, G, Fuenfgelder, H, Aguiam, D, Silva, A, Colas, L & Ceccuzzi, S 2017, 'Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade: Towards modelling of ITER gas injection', Plasma Physics and Controlled Fusion, vol. 59, no. 7, 075004. https://doi.org/10.1088/1361-6587/aa6fe5

TY - JOUR

T1 - Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade

T2 - Towards modelling of ITER gas injection

AU - Zhang, W.

AU - Bobkov, V.

AU - Noterdaeme, J. M.

AU - Tierens, W.

AU - Bilato, R.

AU - Carralero, D.

AU - Coster, D.

AU - Jacquot, J.

AU - Jacquet, P.

AU - Lunt, T.

AU - Pitts, R. A.

AU - Rohde, V.

AU - Siegl, G.

AU - Fuenfgelder, H.

AU - Aguiam, D.

AU - Silva, A.

AU - Colas, L.

AU - Ceccuzzi, S.

PY - 2017/5/18

Y1 - 2017/5/18

N2 - The influence of outer top gas injection on the scrape-off layer (SOL) density and ion cyclotron range of frequency (ICRF) coupling has been studied in ASDEX Upgrade (AUG) L-mode plasmas for the first time. The three-dimensional (3D) edge plasma fluid and neutral transport code EMC3-EIRENE is used to simulate the SOL plasma density, and the 3D wave code RAPLICASOL is used to compute the ICRF coupling resistance with the calculated density. Improvements have been made in the EMC3-EIRENE simulations by fitting transport parameters separately for each gas puffing case. It is found that the calculated local density profiles and coupling resistances are in good agreement with the experimental ones. The results indicate that the SOL density increase depends sensitively on the spreading of the injected outer top gas. If more gas enters into the main chamber through the paths near the top of vessel, the SOL density increase will be more toroidally uniform; if more gas chooses the paths closer to the mid-plane, then the SOL density increase will be more local and more significant. Among the various local gas puffing methods, the mid-plane gas valve close to the antenna is still the best option in terms of improving ICRF coupling. Differences between the outer top gas puffing in AUG and the outer top gas puffing in ITER are briefly summarized. Instructive suggestions for ITER and future plans for ITER gas injection simulations are discussed.

AB - The influence of outer top gas injection on the scrape-off layer (SOL) density and ion cyclotron range of frequency (ICRF) coupling has been studied in ASDEX Upgrade (AUG) L-mode plasmas for the first time. The three-dimensional (3D) edge plasma fluid and neutral transport code EMC3-EIRENE is used to simulate the SOL plasma density, and the 3D wave code RAPLICASOL is used to compute the ICRF coupling resistance with the calculated density. Improvements have been made in the EMC3-EIRENE simulations by fitting transport parameters separately for each gas puffing case. It is found that the calculated local density profiles and coupling resistances are in good agreement with the experimental ones. The results indicate that the SOL density increase depends sensitively on the spreading of the injected outer top gas. If more gas enters into the main chamber through the paths near the top of vessel, the SOL density increase will be more toroidally uniform; if more gas chooses the paths closer to the mid-plane, then the SOL density increase will be more local and more significant. Among the various local gas puffing methods, the mid-plane gas valve close to the antenna is still the best option in terms of improving ICRF coupling. Differences between the outer top gas puffing in AUG and the outer top gas puffing in ITER are briefly summarized. Instructive suggestions for ITER and future plans for ITER gas injection simulations are discussed.

KW - 3D simulations

KW - ICRF coupling

KW - ITER

KW - gas puffing/fuelling

KW - scrape-off layer

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U2 - 10.1088/1361-6587/aa6fe5

DO - 10.1088/1361-6587/aa6fe5

M3 - Article

AN - SCOPUS:85020474485

SN - 0741-3335

VL - 59

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 7

M1 - 075004

ER -

Effects of outer top gas injection on ICRF coupling in ASDEX Upgrade: Towards modelling of ITER gas injection

Abstract

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Keywords

UN SDGs

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