Commissioning and first results of the reinstated JET ICRF ILA

Journal Article · Mon May 22 00:00:00 EDT 2017 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2017.05.050· OSTI ID:1860555

Dumortier, Pierre ^[1]; Durodie, F. ^[2]; Blackman, T. ^[3]; Graham, M. ^[3]; Helou, W. ^[4]; Lerche, E. ^[1]; Monakhov, I. ^[3]; Noble, C. ^[3]; Wooldridge, E. ^[3]; Goulding, Richard H. ^[5]; Jacquet, P. ^[3]; Kaufman, Michael ^[5]

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1. Laboratory for Plasma Physics, ERM/KMS, Brussels (Belguim); Culham Science Center, Abingdon (United Kingdom)
2. Laboratory for Plasma Physics, ERM/KMS, Brussels (Belguim)
3. Culham Science Center, Abingdon (United Kingdom)
4. Institute for Magnetic Fusion Research (IRFM) (France)
5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The JET ICRF ITER-like Antenna (ILA) has been operated at 33, 42 and 47 MHz in 2008–2009 but stopped operation in 2009 due to the failure of one of the tuning capacitors inside the antenna. Tests on a spare capacitor showed that a micro-leak was caused by the cycle wear of a capacitor’s internal bellows. The ILA was reinstated with a new operating scheme minimizing the full stroke requests of the capacitor. This contribution gives an overview of the works undertaken to reinstate the JET ILA up to the first results on plasma. The capacitors were replaced and high voltage tests of the capacitors were performed. An extensive calibration of all the measurements in the RF circuit was carried out. New simulation tools were created and control algorithms were implemented for the – toroidal and poloidal – phase control of the array as well as for the matching of the second stage. New protections are being implemented for the thermal and voltage protection of the capacitors. Low voltage matching tests were performed before the high power commissioning. Finally the first results on plasma are presented, showing that the new controls allow extending the range of the operation to lower (29 MHz) and higher (51 MHz) frequencies than previously achieved.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: Euratom research and training programme; USDOE
• Contributing Organization: JFT-EFDA Contributors
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1860555
• Journal Information: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Journal Issue: 1 Vol. 123; ISSN 0920-3796
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ICRF
ICRH
ILA
JET
antenna