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Title: Heat Flux Calculation and Problem of Flaking of Boron Carbide Coatings on the Faraday Screen of the ICRH Antennas During Tore Supra High Power, Long Pulse Operation

Abstract

Reliable and repetitive high power and long pulse tokamak operation is strongly dependant of the ability to secure the Plasma Facing Components (PFCs). In Tore Supra, a network of 7 infrared (IR) video cameras is routinely used to prevent PFCs overheating and damage in selected regions. Real time feedback control and offline analysis are essential for basic protection and understanding of abnormal thermal events. One important limitation detected by the IR real time feed-back loop during high power RF operation (injected power of 9.5 MW over 26 s and 12 MW over 10 s have been achieved respectively in 2006 and 2008) is due to the interaction between fast ions which increase the power flux density and flaking of the boron carbide coatings on the Faraday screen box of the ICRH antennas. An IR-based experimental procedure is proposed in order to detect new flakes during plasma operation. The thermal response of the B4C coating is studied with and without flaking during plasma operation. The experimental heat flux deposited by fast ion losses on the Faraday screen is calculated for high (3.8 T) and low magnetic field (2 T) during high RF power operation (with fundamental hydrogen minority and second harmonicmore » ICRH heating schemes respectively). The paper addresses both thermal science issues applied to machine protection and limitation due to fast ions issues during high RF power, long pulse operation. Safety margin to critical heat flux and number of fatigue cycles under heat load are presented in the paper.« less

Authors:
 [1];  [2];  [3];  [2];  [4];  [5];  [1];  [6];  [7];  [8];  [6];  [5];  [5];  [7];  [5];  [5];  [5]
  1. French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance
  2. CEA IRFM, St. Paul-lez-Durance, France
  3. Fusion for Energy (F4E), Barcelona, Spain
  4. French Atomic Energy Commission (CEA)
  5. CEA, St. Paul Les Durance, France
  6. French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)
  7. University of Aix, Marseille, France
  8. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1120477
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 86; Journal Issue: 4-5; Journal ID: ISSN 0920-3796
Country of Publication:
United States
Language:
English

Citation Formats

Corre, Y., Lipa, M., Agarici, G., Basiuk, V., Colas, L., Courtois, X., Dumont, R. J., Ekedahl, A., Gardarein, J. L., Klepper, C Christopher, Martin, V., Moncada, V., Portafaix, C., Rigollet, F., Tawizgant, R., Travere, J. M., and Valliez, K. Heat Flux Calculation and Problem of Flaking of Boron Carbide Coatings on the Faraday Screen of the ICRH Antennas During Tore Supra High Power, Long Pulse Operation. United States: N. p., 2011. Web. doi:10.1016/j.fusengdes.2011.03.120.
Corre, Y., Lipa, M., Agarici, G., Basiuk, V., Colas, L., Courtois, X., Dumont, R. J., Ekedahl, A., Gardarein, J. L., Klepper, C Christopher, Martin, V., Moncada, V., Portafaix, C., Rigollet, F., Tawizgant, R., Travere, J. M., & Valliez, K. Heat Flux Calculation and Problem of Flaking of Boron Carbide Coatings on the Faraday Screen of the ICRH Antennas During Tore Supra High Power, Long Pulse Operation. United States. https://doi.org/10.1016/j.fusengdes.2011.03.120
Corre, Y., Lipa, M., Agarici, G., Basiuk, V., Colas, L., Courtois, X., Dumont, R. J., Ekedahl, A., Gardarein, J. L., Klepper, C Christopher, Martin, V., Moncada, V., Portafaix, C., Rigollet, F., Tawizgant, R., Travere, J. M., and Valliez, K. 2011. "Heat Flux Calculation and Problem of Flaking of Boron Carbide Coatings on the Faraday Screen of the ICRH Antennas During Tore Supra High Power, Long Pulse Operation". United States. https://doi.org/10.1016/j.fusengdes.2011.03.120.
@article{osti_1120477,
title = {Heat Flux Calculation and Problem of Flaking of Boron Carbide Coatings on the Faraday Screen of the ICRH Antennas During Tore Supra High Power, Long Pulse Operation},
author = {Corre, Y. and Lipa, M. and Agarici, G. and Basiuk, V. and Colas, L. and Courtois, X. and Dumont, R. J. and Ekedahl, A. and Gardarein, J. L. and Klepper, C Christopher and Martin, V. and Moncada, V. and Portafaix, C. and Rigollet, F. and Tawizgant, R. and Travere, J. M. and Valliez, K.},
abstractNote = {Reliable and repetitive high power and long pulse tokamak operation is strongly dependant of the ability to secure the Plasma Facing Components (PFCs). In Tore Supra, a network of 7 infrared (IR) video cameras is routinely used to prevent PFCs overheating and damage in selected regions. Real time feedback control and offline analysis are essential for basic protection and understanding of abnormal thermal events. One important limitation detected by the IR real time feed-back loop during high power RF operation (injected power of 9.5 MW over 26 s and 12 MW over 10 s have been achieved respectively in 2006 and 2008) is due to the interaction between fast ions which increase the power flux density and flaking of the boron carbide coatings on the Faraday screen box of the ICRH antennas. An IR-based experimental procedure is proposed in order to detect new flakes during plasma operation. The thermal response of the B4C coating is studied with and without flaking during plasma operation. The experimental heat flux deposited by fast ion losses on the Faraday screen is calculated for high (3.8 T) and low magnetic field (2 T) during high RF power operation (with fundamental hydrogen minority and second harmonic ICRH heating schemes respectively). The paper addresses both thermal science issues applied to machine protection and limitation due to fast ions issues during high RF power, long pulse operation. Safety margin to critical heat flux and number of fatigue cycles under heat load are presented in the paper.},
doi = {10.1016/j.fusengdes.2011.03.120},
url = {https://www.osti.gov/biblio/1120477}, journal = {Fusion Engineering and Design},
issn = {0920-3796},
number = 4-5,
volume = 86,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2011},
month = {Sat Jan 01 00:00:00 EST 2011}
}