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Bulk ion heating with ICRF waves in Tokamaks

MJ Mantsinen, R Bilato, VV Bobkov, A Kappatou, RM McDermott, M Nocente, T Odstrcil, G Tardini, M Bernert, R Dux, et al. (2015) AIP Conference Proceedings. In AIP Conference Proceedings 1689.
abstract
Heating with ICRF waves is a well-established method on present-day tokamaks and one of the heating systems foreseen for ITER. However, further work is still needed to test and optimize its performance in fusion devices with metallic high-Z plasma facing components (PFCs) in preparation of ITER and DEMO operation. This is of particular importance for the bulk ion heating capabilities of ICRF waves. Efficient bulk ion heating with the standard ITER ICRF scheme, i.e. the second harmonic heating of tritium with or without He-3 minority, was demonstrated in experiments carried out in deuterium-tritium plasmas on JET and TFTR and is confirmed by ICRF modelling. This paper focuses on recent experiments with He-3 minority heating for bulk ion heating on the ASDEX Upgrade (AUG) tokamak with ITER-relevant all-tungsten PFCs. An increase of 80% in the central ion temperature T-i from 3 to 5.5 keV was achieved when 3 MW of ICRF power tuned to the central He-3 ion cyclotron resonance was added to 4.5 MW of deuterium NBI. The radial gradient of the Ti profile reached locally values up to about 50 keV/m and the normalized logarithmic ion temperature gradients R/L-Ti of about 20, which are unusually large for AUG plasmas. The large changes in the Ti profiles were accompanied by significant changes in measured plasma toroidal rotation, plasma impurity profiles and MHD activity, which indicate concomitant changes in plasma properties with the application of ICRF waves. When the He-3 concentration was increased above the optimum range for bulk ion heating, a weaker peaking of the ion temperature profile was observed, in line with theoretical expectations.
Please use this url to cite or link to this publication:
author
organization
year
type
conference (proceedingsPaper)
publication status
published
subject
keyword
FREQUENCIES, CYCLOTRON-RESONANCE, FUSION, RANGE, JET DT PLASMAS, DEUTERIUM-TRITIUM PLASMAS
in
AIP Conference Proceedings
series title
AIP Conference Proceedings
volume
1689
issue title
RADIOFREQUENCY POWER IN PLASMAS
article number
030005
pages
8 pages
publisher
AMER INST PHYSICS
place of publication
MELVILLE
conference name
21st Topical Conference on Radiofrequency Power in Plasmas
conference location
CA
conference start
2015-04-27
conference end
2015-04-29
Web of Science type
Proceedings Paper
Web of Science id
000366583100008
ISSN
0094-243X
ISBN
978-0-7354-1336-8
DOI
10.1063/1.4936470
language
English
UGent publication?
no
classification
P1
id
7122018
handle
http://hdl.handle.net/1854/LU-7122018
date created
2016-03-01 10:43:13
date last changed
2017-01-02 09:53:22
@inproceedings{7122018,
  abstract     = {Heating with ICRF waves is a well-established method on present-day tokamaks and one of the heating systems foreseen for ITER. However, further work is still needed to test and optimize its performance in fusion devices with metallic high-Z plasma facing components (PFCs) in preparation of ITER and DEMO operation. This is of particular importance for the bulk ion heating capabilities of ICRF waves. Efficient bulk ion heating with the standard ITER ICRF scheme, i.e. the second harmonic heating of tritium with or without He-3 minority, was demonstrated in experiments carried out in deuterium-tritium plasmas on JET and TFTR and is confirmed by ICRF modelling. This paper focuses on recent experiments with He-3 minority heating for bulk ion heating on the ASDEX Upgrade (AUG) tokamak with ITER-relevant all-tungsten PFCs. An increase of 80\% in the central ion temperature T-i from 3 to 5.5 keV was achieved when 3 MW of ICRF power tuned to the central He-3 ion cyclotron resonance was added to 4.5 MW of deuterium NBI. The radial gradient of the Ti profile reached locally values up to about 50 keV/m and the normalized logarithmic ion temperature gradients R/L-Ti of about 20, which are unusually large for AUG plasmas. The large changes in the Ti profiles were accompanied by significant changes in measured plasma toroidal rotation, plasma impurity profiles and MHD activity, which indicate concomitant changes in plasma properties with the application of ICRF waves. When the He-3 concentration was increased above the optimum range for bulk ion heating, a weaker peaking of the ion temperature profile was observed, in line with theoretical expectations.},
  articleno    = {030005},
  author       = {Mantsinen, MJ and Bilato, R and Bobkov, VV and Kappatou, A and McDermott, RM and Nocente, M and Odstrcil, T and Tardini, G and Bernert, M and Dux, R and Hellsten, T and Mantica, P and Maraschek, M and Nielsen, SK and Noterdaeme, JM and Rasmussen, J and Ryter, F and Stejner, M and Stober, J and Tardocchi, M},
  booktitle    = {AIP Conference Proceedings},
  isbn         = {978-0-7354-1336-8},
  issn         = {0094-243X},
  keyword      = {FREQUENCIES,CYCLOTRON-RESONANCE,FUSION,RANGE,JET DT PLASMAS,DEUTERIUM-TRITIUM PLASMAS},
  language     = {eng},
  location     = {CA},
  pages        = {8},
  publisher    = {AMER INST PHYSICS},
  title        = {Bulk ion heating with ICRF waves in Tokamaks},
  url          = {http://dx.doi.org/10.1063/1.4936470},
  volume       = {1689},
  year         = {2015},
}

Chicago
Mantsinen, MJ, R Bilato, VV Bobkov, A Kappatou, RM McDermott, M Nocente, T Odstrcil, et al. 2015. “Bulk Ion Heating with ICRF Waves in Tokamaks.” In AIP Conference Proceedings. Vol. 1689. MELVILLE: AMER INST PHYSICS.
APA
Mantsinen, M., Bilato, R., Bobkov, V., Kappatou, A., McDermott, R., Nocente, M., Odstrcil, T., et al. (2015). Bulk ion heating with ICRF waves in Tokamaks. AIP Conference Proceedings (Vol. 1689). Presented at the 21st Topical Conference on Radiofrequency Power in Plasmas, MELVILLE: AMER INST PHYSICS.
Vancouver
1.
Mantsinen M, Bilato R, Bobkov V, Kappatou A, McDermott R, Nocente M, et al. Bulk ion heating with ICRF waves in Tokamaks. AIP Conference Proceedings. MELVILLE: AMER INST PHYSICS; 2015.
MLA
Mantsinen, MJ, R Bilato, VV Bobkov, et al. “Bulk Ion Heating with ICRF Waves in Tokamaks.” AIP Conference Proceedings. Vol. 1689. MELVILLE: AMER INST PHYSICS, 2015. Print.