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Making ICRF power compatible with a high-Z wall in the ASDEX Upgrade

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Abstract
A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electromagnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.
Keywords
RETARDING-FIELD ANALYZER, ANTENNAS, TOKAMAK, SHEATHS, DESIGN, ICRF, RF sheath, antenna, W sputtering, TOPICA, SSWICH, ASDEX Upgrade

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Chicago
Bobkov, V, Diogo Elói Trindade de Aguiam, R Bilato, S Brezinsek, L Colas, H Faugel, H Fuenfgelder, et al. 2017. “Making ICRF Power Compatible with a high-Z Wall in the ASDEX Upgrade.” Plasma Physics and Controlled Fusion 59 (1).
APA
Bobkov, V., Trindade de Aguiam, D. E., Bilato, R., Brezinsek, S., Colas, L., Faugel, H., Fuenfgelder, H., et al. (2017). Making ICRF power compatible with a high-Z wall in the ASDEX Upgrade. PLASMA PHYSICS AND CONTROLLED FUSION, 59(1).
Vancouver
1.
Bobkov V, Trindade de Aguiam DE, Bilato R, Brezinsek S, Colas L, Faugel H, et al. Making ICRF power compatible with a high-Z wall in the ASDEX Upgrade. PLASMA PHYSICS AND CONTROLLED FUSION. Bristol: Iop Publishing Ltd; 2017;59(1).
MLA
Bobkov, V et al. “Making ICRF Power Compatible with a high-Z Wall in the ASDEX Upgrade.” PLASMA PHYSICS AND CONTROLLED FUSION 59.1 (2017): n. pag. Print.
@article{8519535,
  abstract     = {A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electromagnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing elements of the antenna as a relevant approach for minimizing tungsten (W) sputtering in conditions when the slow wave is strongly evanescent. The measured reaction of the time-averaged RF current at the antenna limiters to the antenna feeding variations is less sensitive than predicted by the calculations. This is likely to have been caused by temporal and spatial fluctuations in the 3D plasma density distribution affected by local non-linear interactions. The 3-strap antenna with the W-coated limiters produces drastically less W sputtering compared to the W-coated 2-strap antennas. This is consistent with the non-linear asymptotic SSWICH-SW calculations for RF sheaths.},
  articleno    = {014022},
  author       = {Bobkov, V and Trindade de Aguiam, Diogo Elói and Bilato, R and Brezinsek, S and Colas, L and Faugel, H and Fuenfgelder, H and Herrmann, A and Jacquot, J and Kallenbach, A and Milanesio, D and Maggiora, R and Neu, R and Noterdaeme, Jean-Marie and Ochoukov, R and Potzel, S and Puetterich, T and Silva, A and Tierens, W and Tuccilo, A and Tudisco, O and Wang, Y and Yang, Q and Zhang, Wei},
  issn         = {0741-3335},
  journal      = {PLASMA PHYSICS AND CONTROLLED FUSION},
  keywords     = {RETARDING-FIELD ANALYZER,ANTENNAS,TOKAMAK,SHEATHS,DESIGN,ICRF,RF sheath,antenna,W sputtering,TOPICA,SSWICH,ASDEX Upgrade},
  language     = {eng},
  number       = {1},
  pages        = {11},
  publisher    = {Iop Publishing Ltd},
  title        = {Making ICRF power compatible with a high-Z wall in the ASDEX Upgrade},
  url          = {http://dx.doi.org/10.1088/0741-3335/59/1/014022},
  volume       = {59},
  year         = {2017},
}

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