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Title: Calibrations and verifications performed in view of the ILA reinstatement at JET

The calibrations and verifications that are performed in preparation of the ITER-Like antenna (ILA) reinstatement at JET are reviewed. A brief reminder of the ILA system layout is given. The different calibration methods and results are then discussed. They encompass the calibrations of the directional couplers present in the system, the determination of the relation between the capacitor position readings and the capacitance value, the voltage probes calibration inside the antenna housing, the RF cables characterization and the acquisition electronics circuit calibration. Earlier experience with the ILA has shown that accurate calibrations are essential for the control of the full ILA close-packed antenna array, its protection through the S-Matrix Arc Detection and the new second stage matching algorithm to be implemented. Finally the voltage stand-off of the capacitors is checked and the phase range achievable with the system is verified. The system layout is modified as to allow dipole operation over the whole operating frequency range when operating with the 3dB combiner-splitters.
Authors:
;  [1] ;  [2] ; ; ; ; ;  [3] ;
  1. LPP-ERM-KMS, TEC partner, Brussels (Belgium)
  2. CEA, IRFM, F-13108 St-Paul-Lez-Durance (France)
  3. CCFE, Culham Science Centre, Abingdon (United Kingdom)
Publication Date:
OSTI Identifier:
22496209
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1689; Journal Issue: 1; Conference: 21. topical conference on radio frequency power in plasmas, Lake Arrowhead, CA (United States), 27-29 Apr 2015; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALGORITHMS; ANTENNAS; CABLES; CALIBRATION; CAPACITANCE; CAPACITORS; DIPOLES; ELECTRIC POTENTIAL; FREQUENCY RANGE; ITER TOKAMAK; JETS; RADIOWAVE RADIATION; S MATRIX; VERIFICATION