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Preparing ITER ICRF: development and analysis of the load-resilient matching systems based on antenna mock-up measurements

A Messiaen, M Vervier, P Dumortier, Djamel Grine, P Lamalle, F Durodié, R Koch, F Louche and R Weynants (2009) NUCLEAR FUSION. 49(5).
abstract
The reference design for the ICRF antenna of ITER is constituted by a tight array of 24 straps grouped in eight triplets. The matching network must be load resilient for operation in ELMy discharges and must have antenna spectrum control for heating or current drive operation. The load resilience is based on the use of either hybrid couplers or conjugate-T circuits. However, the mutual coupling between the triplets at the low expected loading strongly counteracts the load resilience and the spectrum control. Using a mock-up of the ITER antenna array with adjustable water load matching solutions are designed. These solutions are derived from transmission line modelling based on the measured scattering matrix and are finally tested. We show that the array current spectrum can be controlled by the anti-node voltage distribution and that suitable decoupler circuits can not only neutralize the adverse mutual coupling effects but also monitor this anti-node voltage distribution. A matching solution using four 3 dB hybrids and the antenna current spectrum feedback control by the decouplers provides outstanding performance if each pair of poloidal triplets undergoes a same load variation. Finally, it is verified by modelling that this matching scenario has the same antenna spectrum and load resilience performances as the antenna array loaded by plasma as described by the TOPICA simulation. This is true for any phasing and frequency in the ITER frequency band. The conjugate-T solution is presently considered as a back-up option.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
PLUG-IN, WATER LOAD, DESIGN
journal title
NUCLEAR FUSION
Nucl. Fusion
volume
49
issue
5
article number
055004
Web of Science type
Article
Web of Science id
000266508200005
JCR category
PHYSICS, FLUIDS & PLASMAS
JCR impact factor
4.27 (2009)
JCR rank
2/28 (2009)
JCR quartile
1 (2009)
ISSN
0029-5515
DOI
10.1088/0029-5515/49/5/055004
language
English
UGent publication?
no
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2061626
handle
http://hdl.handle.net/1854/LU-2061626
date created
2012-03-07 12:34:19
date last changed
2016-12-21 15:41:58
@article{2061626,
  abstract     = {The reference design for the ICRF antenna of ITER is constituted by a tight array of 24 straps grouped in eight triplets. The matching network must be load resilient for operation in ELMy discharges and must have antenna spectrum control for heating or current drive operation. The load resilience is based on the use of either hybrid couplers or conjugate-T circuits. However, the mutual coupling between the triplets at the low expected loading strongly counteracts the load resilience and the spectrum control. Using a mock-up of the ITER antenna array with adjustable water load matching solutions are designed. These solutions are derived from transmission line modelling based on the measured scattering matrix and are finally tested. We show that the array current spectrum can be controlled by the anti-node voltage distribution and that suitable decoupler circuits can not only neutralize the adverse mutual coupling effects but also monitor this anti-node voltage distribution. A matching solution using four 3 dB hybrids and the antenna current spectrum feedback control by the decouplers provides outstanding performance if each pair of poloidal triplets undergoes a same load variation. Finally, it is verified by modelling that this matching scenario has the same antenna spectrum and load resilience performances as the antenna array loaded by plasma as described by the TOPICA simulation. This is true for any phasing and frequency in the ITER frequency band. The conjugate-T solution is presently considered as a back-up option.},
  articleno    = {055004},
  author       = {Messiaen, A and Vervier, M and Dumortier, P and Grine, Djamel and Lamalle, P and Durodi{\'e}, F and Koch, R and Louche, F and Weynants, R},
  issn         = {0029-5515},
  journal      = {NUCLEAR FUSION},
  keyword      = {PLUG-IN,WATER LOAD,DESIGN},
  language     = {eng},
  number       = {5},
  title        = {Preparing ITER ICRF: development and analysis of the load-resilient matching systems based on antenna mock-up measurements},
  url          = {http://dx.doi.org/10.1088/0029-5515/49/5/055004},
  volume       = {49},
  year         = {2009},
}

Chicago
Messiaen, A, M Vervier, P Dumortier, Djamel Grine, P Lamalle, F Durodié, R Koch, F Louche, and R Weynants. 2009. “Preparing ITER ICRF: Development and Analysis of the Load-resilient Matching Systems Based on Antenna Mock-up Measurements.” Nuclear Fusion 49 (5).
APA
Messiaen, A., Vervier, M., Dumortier, P., Grine, D., Lamalle, P., Durodié, F., Koch, R., et al. (2009). Preparing ITER ICRF: development and analysis of the load-resilient matching systems based on antenna mock-up measurements. NUCLEAR FUSION, 49(5).
Vancouver
1.
Messiaen A, Vervier M, Dumortier P, Grine D, Lamalle P, Durodié F, et al. Preparing ITER ICRF: development and analysis of the load-resilient matching systems based on antenna mock-up measurements. NUCLEAR FUSION. 2009;49(5).
MLA
Messiaen, A, M Vervier, P Dumortier, et al. “Preparing ITER ICRF: Development and Analysis of the Load-resilient Matching Systems Based on Antenna Mock-up Measurements.” NUCLEAR FUSION 49.5 (2009): n. pag. Print.