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Studies of RF sheaths and diagnostics on IShTAR

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Abstract
IShTAR (Ion cyclotron Sheath Test ARrangement) is a linear magnetised plasma test facility for RF sheaths studies at the Max-Planck-Institut four Plasmaphysik in Garching. In contrast to a tokamak, a test stand provides more liberty to impose the parameters and gives better access for the instrumentation and antennas. The project will support the development of diagnostic methods for characterising RF sheaths and validate and improve theoretical predictions. The cylindrical vacuum vessel has a diameter of 1 m and is 1.1 m long. The plasma is created by an external cylindrical plasma source equipped with a helical antenna that has been designed to excite the m =1 helicon mode. In inductive mode, plasma densities and electron temperatures have been characterised with a planar Langmuir probe as a function of gas pressure and input RF power. A 2D array of RF compensated Langmuir probes and a spectrometer are planned. A single strap RF antenna has been designed; the plasma-facing surface is aligned to the cylindrical plasma to ease the modelling. The probes will allow direct measurements of plasma density profiles in front of the RF antenna, and thus a detailed study of the density modifications induced by RF sheaths, which influences the coupling. The RF antenna frequency has been chosen to study different plasma wave interactions: the accessible plasma density range includes an evanescent and propagative behaviour of slow or fast waves, and allows the study of the effect of the lower hybrid resonance layer.

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Citation

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MLA
Crombé, Kristel et al. “Studies of RF Sheaths and Diagnostics on IShTAR.” AIP Conference Proceedings. Vol. 1689. MELVILLE: AMER INST PHYSICS, 2015. Print.
APA
Crombé, K., Devaux, S., D’Inca, R., Faudot, E., Faugel, H., Funfgelder, H., Heuraux, S., et al. (2015). Studies of RF sheaths and diagnostics on IShTAR. AIP Conference Proceedings (Vol. 1689). Presented at the 21st Topical Conference on Radiofrequency Power in Plasmas, MELVILLE: AMER INST PHYSICS.
Chicago author-date
Crombé, Kristel, S Devaux, R D’Inca, E Faudot, H Faugel, H Funfgelder, S Heuraux, et al. 2015. “Studies of RF Sheaths and Diagnostics on IShTAR.” In AIP Conference Proceedings. Vol. 1689. MELVILLE: AMER INST PHYSICS.
Chicago author-date (all authors)
Crombé, Kristel, S Devaux, R D’Inca, E Faudot, H Faugel, H Funfgelder, S Heuraux, J Jacquot, F Louche, J Moritz, R Ochoukov, M Tripsky, D Van Eester, T Wauters, and Jean-Marie Noterdaeme. 2015. “Studies of RF Sheaths and Diagnostics on IShTAR.” In AIP Conference Proceedings. Vol. 1689. MELVILLE: AMER INST PHYSICS.
Vancouver
1.
Crombé K, Devaux S, D’Inca R, Faudot E, Faugel H, Funfgelder H, et al. Studies of RF sheaths and diagnostics on IShTAR. AIP Conference Proceedings. MELVILLE: AMER INST PHYSICS; 2015.
IEEE
[1]
K. Crombé et al., “Studies of RF sheaths and diagnostics on IShTAR,” in AIP Conference Proceedings, CA, 2015, vol. 1689.
@inproceedings{7107573,
  abstract     = {IShTAR (Ion cyclotron Sheath Test ARrangement) is a linear magnetised plasma test facility for RF sheaths studies at the Max-Planck-Institut four Plasmaphysik in Garching. In contrast to a tokamak, a test stand provides more liberty to impose the parameters and gives better access for the instrumentation and antennas. The project will support the development of diagnostic methods for characterising RF sheaths and validate and improve theoretical predictions. The cylindrical vacuum vessel has a diameter of 1 m and is 1.1 m long. The plasma is created by an external cylindrical plasma source equipped with a helical antenna that has been designed to excite the m =1 helicon mode. In inductive mode, plasma densities and electron temperatures have been characterised with a planar Langmuir probe as a function of gas pressure and input RF power. A 2D array of RF compensated Langmuir probes and a spectrometer are planned. A single strap RF antenna has been designed; the plasma-facing surface is aligned to the cylindrical plasma to ease the modelling. The probes will allow direct measurements of plasma density profiles in front of the RF antenna, and thus a detailed study of the density modifications induced by RF sheaths, which influences the coupling. The RF antenna frequency has been chosen to study different plasma wave interactions: the accessible plasma density range includes an evanescent and propagative behaviour of slow or fast waves, and allows the study of the effect of the lower hybrid resonance layer.},
  articleno    = {030006},
  author       = {Crombé, Kristel and Devaux, S and D'Inca, R and Faudot, E and Faugel, H and Funfgelder, H and Heuraux, S and Jacquot, J and Louche, F and Moritz, J and Ochoukov, R and Tripsky, M and Van Eester, D and Wauters, T and Noterdaeme, Jean-Marie},
  booktitle    = {AIP Conference Proceedings},
  isbn         = {978-0-7354-1336-8},
  issn         = {0094-243X},
  language     = {eng},
  location     = {CA},
  pages        = {8},
  publisher    = {AMER INST PHYSICS},
  title        = {Studies of RF sheaths and diagnostics on IShTAR},
  url          = {http://dx.doi.org/10.1063/1.4936471},
  volume       = {1689},
  year         = {2015},
}

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