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Detection of signals in the ion cyclotron frequency range at the edge during ICRF heating on ASDEX Upgrade

Author
Organization
Abstract
The ICRF system on ASDEX Upgrade is equipped with an arc detector based on the observation of frequencies between 5 and 25 MHz in the RF feeding line [RI). On some shots, the detector was triggered in an anomalous way: tenths of detections over several hundreds of milliseconds on detectors of all antennas at the same time [R2]. It was suggested that these frequencies were not excited by arcs but came from the plasma. We installed a RF probe inside the vacuum vessel and connected it to a fast acquisition system. We indeed observed frequencies during ICRF heating of several shots. We present here the features of these frequencies, their possible conditions of existence in terms of plasma and RF parameters (magnetic field, density, temperature, RF frequency, power injected) and we compare the source of these frequencies with known phenomena like ICE, CAE and surface waves.
Keywords
ICE, ICRF, PLASMA

Citation

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Chicago
D’Inca, R, S Assas, V Bobkov, and Jean-Marie Noterdaeme. 2009. “Detection of Signals in the Ion Cyclotron Frequency Range at the Edge During ICRF Heating on ASDEX Upgrade.” In AIP Conference Proceedings, ed. V Bobkov and JM Noterdaeme, 1187:249–252. Melville, NY, USA: AIP (American Institute of Physics).
APA
D’Inca, R., Assas, S., Bobkov, V., & Noterdaeme, J.-M. (2009). Detection of signals in the ion cyclotron frequency range at the edge during ICRF heating on ASDEX Upgrade. In V. Bobkov & J. Noterdaeme (Eds.), AIP Conference Proceedings (Vol. 1187, pp. 249–252). Presented at the 18th Topical Conference on Radio Frequence Power in Plasmas, Melville, NY, USA: AIP (American Institute of Physics).
Vancouver
1.
D’Inca R, Assas S, Bobkov V, Noterdaeme J-M. Detection of signals in the ion cyclotron frequency range at the edge during ICRF heating on ASDEX Upgrade. In: Bobkov V, Noterdaeme J, editors. AIP Conference Proceedings. Melville, NY, USA: AIP (American Institute of Physics); 2009. p. 249–52.
MLA
D’Inca, R, S Assas, V Bobkov, et al. “Detection of Signals in the Ion Cyclotron Frequency Range at the Edge During ICRF Heating on ASDEX Upgrade.” AIP Conference Proceedings. Ed. V Bobkov & JM Noterdaeme. Vol. 1187. Melville, NY, USA: AIP (American Institute of Physics), 2009. 249–252. Print.
@inproceedings{2948434,
  abstract     = {The ICRF system on ASDEX Upgrade is equipped with an arc detector based on the observation of frequencies between 5 and 25 MHz in the RF feeding line [RI). On some shots, the detector was triggered in an anomalous way: tenths of detections over several hundreds of milliseconds on detectors of all antennas at the same time [R2]. It was suggested that these frequencies were not excited by arcs but came from the plasma. We installed a RF probe inside the vacuum vessel and connected it to a fast acquisition system. We indeed observed frequencies during ICRF heating of several shots. We present here the features of these frequencies, their possible conditions of existence in terms of plasma and RF parameters (magnetic field, density, temperature, RF frequency, power injected) and we compare the source of these frequencies with known phenomena like ICE, CAE and surface waves.},
  author       = {D'Inca, R and Assas, S and Bobkov, V and Noterdaeme, Jean-Marie},
  booktitle    = {AIP Conference Proceedings},
  editor       = { Bobkov, V and Noterdaeme, JM },
  isbn         = {9780735407534},
  issn         = {0094-243X},
  keyword      = {ICE,ICRF,PLASMA},
  language     = {eng},
  location     = {Ghent, Belgium},
  pages        = {249--252},
  publisher    = {AIP (American Institute of Physics)},
  title        = {Detection of signals in the ion cyclotron frequency range at the edge during ICRF heating on ASDEX Upgrade},
  volume       = {1187},
  year         = {2009},
}

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