Scattering-matrix arc detection on the JET ITER-like ICRH antenna

Conference · Mon Jun 01 00:00:00 EDT 2009

OSTI ID:1018300

Becoulet, A ^[1]; Vrancken, M ^[2]; Dumortier, P ^[2]; Durodie, F ^[2]; Evrard, M ^[2]; Huygen, S ^[2]; Lerche, E ^[2]; Van Eester, D ^[2]; Vervier, M ^[2]; Argouarch, A ^[3]; Blackman, T ^[4]; Graham, M ^[4]; Jacquet, P ^[4]; Kaye, A ^[4]; Nightingale, M ^[4]; Goulding, Richard Howell ^[5]

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1. CEA, Cadarache, France
2. ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium
3. CEA-Cadarache, St. Paul lex Durance, France
4. EURATOM / UKAEA, Abingdon, UK
5. ORNL

Operating Ion Cyclotron Resonance Heating (ICRH) antennas at high power density puts them at risk of arcing which reduces the coupled power to the plasma because the perturbed impedance match triggers the Voltage Standing Wave Ratio (VWSR) based generator trip system but even worse might damage the antenna beyond repair because of the the arc s localised energy deposition. New antennas are designed to operate in a load tolerant way which creates low impedance zones that are especially at risk since the existing VSWR protection systems are less sensitive to arcs in these areas. To protect these low impedance areas, a new arc protection system referred as Scattering Matrix Arc Detection (SMAD) was proposed. This paper describes the basic operating principle and implementation in hard- and software for the JET ITER-Like Antenna (ILA), with testbed and preliminary JET commissioning results.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1018300
• Resource Relation: Conference: 25th Symposium on Fusion Technology, Rostock, Germany, 20080915, 20090919
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ANTENNAS
COMMISSIONING
DETECTION
ICR HEATING
IMPEDANCE
IMPLEMENTATION
PLASMA
POWER DENSITY
REPAIR
SCATTERING
STANDING WAVES