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3D simulations of gas puff effects on edge density and ICRF coupling in ASDEX Upgrade

(2016) NUCLEAR FUSION. 56(3).
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Abstract
In recent experiments, a local gas puff was found to be an effective way to tailor the scrape-off layer (SOL) density and improve the ion cyclotron range of frequency (ICRF) power coupling in tokamaks. In order to quantitatively reproduce these experiments, to understand the corresponding physics and to optimize the gas valve positions and rates, simulations were carried out with the 3D edge plasma transport code EMC3-EIRENE in ASDEX Upgrade. An inter-ELM phase of an H-mode discharge with a moderate gas puff rate (1.2 x 10(22) electrons s(-1)) is used in our simulations. We simulated cases with gas puff in the lower divertor, the outer mid-plane and the top of the machine while keeping other conditions the same. Compared with the lower divertor gas puff, the outer mid-plane gas puff can increase the local density in front of the antennas most effectively, while a toroidally uniform but significantly smaller enhancement is found for the top gas puff. Good agreement between our simulations and experiments is obtained. With further simulations, the mechanisms of SOL density tailoring via local gas puffing and the strategies of gas puff optimization are discussed in the paper.
Keywords
PLASMAS, WAVES, gas puff, ICRF coupling, 3D simulations, plasma edge density

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Citation

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Chicago
Zhang, Wei, V. Bobkov, T. Lunt, Jean-Marie Noterdaeme, D. Coster, R. Bilato, P. Jacquet, et al. 2016. “3D Simulations of Gas Puff Effects on Edge Density and ICRF Coupling in ASDEX Upgrade.” Nuclear Fusion 56 (3).
APA
Zhang, Wei, Bobkov, V., Lunt, T., Noterdaeme, J.-M., Coster, D., Bilato, R., Jacquet, P., et al. (2016). 3D simulations of gas puff effects on edge density and ICRF coupling in ASDEX Upgrade. NUCLEAR FUSION, 56(3).
Vancouver
1.
Zhang W, Bobkov V, Lunt T, Noterdaeme J-M, Coster D, Bilato R, et al. 3D simulations of gas puff effects on edge density and ICRF coupling in ASDEX Upgrade. NUCLEAR FUSION. Bristol: Iop Publishing Ltd; 2016;56(3).
MLA
Zhang, Wei, V. Bobkov, T. Lunt, et al. “3D Simulations of Gas Puff Effects on Edge Density and ICRF Coupling in ASDEX Upgrade.” NUCLEAR FUSION 56.3 (2016): n. pag. Print.
@article{8519881,
  abstract     = {In recent experiments, a local gas puff was found to be an effective way to tailor the scrape-off layer (SOL) density and improve the ion cyclotron range of frequency (ICRF) power coupling in tokamaks. In order to quantitatively reproduce these experiments, to understand the corresponding physics and to optimize the gas valve positions and rates, simulations were carried out with the 3D edge plasma transport code EMC3-EIRENE in ASDEX Upgrade. An inter-ELM phase of an H-mode discharge with a moderate gas puff rate (1.2 x 10(22) electrons s(-1)) is used in our simulations. We simulated cases with gas puff in the lower divertor, the outer mid-plane and the top of the machine while keeping other conditions the same. Compared with the lower divertor gas puff, the outer mid-plane gas puff can increase the local density in front of the antennas most effectively, while a toroidally uniform but significantly smaller enhancement is found for the top gas puff. Good agreement between our simulations and experiments is obtained. With further simulations, the mechanisms of SOL density tailoring via local gas puffing and the strategies of gas puff optimization are discussed in the paper.},
  articleno    = {036007},
  author       = {Zhang, Wei and Bobkov, V. and Lunt, T. and Noterdaeme, Jean-Marie and Coster, D. and Bilato, R. and Jacquet, P. and Brida, D. and Feng, Y. and Wolfrum, E. and Guimarais, L.},
  issn         = {0029-5515},
  journal      = {NUCLEAR FUSION},
  keyword      = {PLASMAS,WAVES,gas puff,ICRF coupling,3D simulations,plasma edge density},
  language     = {eng},
  number       = {3},
  pages        = {11},
  publisher    = {Iop Publishing Ltd},
  title        = {3D simulations of gas puff effects on edge density and ICRF coupling in ASDEX Upgrade},
  url          = {http://dx.doi.org/10.1088/0029-5515/56/3/036007},
  volume       = {56},
  year         = {2016},
}

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