Characterization of local heat fluxes around ICRF antennas on JET

Journal Article · Wed Feb 12 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4864538· OSTI ID:22263863

Campergue, A. -L. ^[1]; Jacquet, P.; Monakhov, I.; Arnoux, G.; Brix, M.; Sirinelli, A. ^[2]; Bobkov, V. ^[3]; Milanesio, D. ^[4]; Colas, L. ^[5]

---

1. Ecole Nationale des Ponts et Chaussées, F77455 Marne-la-Vallée (France)
2. Euratom/CCFE Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom)
3. Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Garching (Germany)
4. Politecnico di Torino, Department of Electronics, Torino (Italy)
5. CEA, IRFM, F-13108 Saint-Paul-Lez-Durance (France)

When using Ion Cyclotron Range of Frequency (ICRF) heating, enhanced power deposition on Plasma-Facing Components (PFCs) close to the antennas can occur. Experiments have recently been carried out on JET with the new ITER-Like-Wall (ILW) to characterize the heat fluxes on the protection of the JET ICRF antennas, using Infra-Red (IR) thermography measurement. The measured heat flux patterns along the poloidal limiters surrounding powered antennas were compared to predictions from a simple RF sheath rectification model. The RF electric field, parallel to the static magnetic field in front of the antenna, was evaluated using the TOPICA code, integrating a 3D flattened model of the JET A2 antennas. The poloidal density variation in front of the limiters was obtained from the mapping of the Li-beam or edge reflectometry measurements using the flux surface geometry provided by EFIT equilibrium reconstruction. In many cases, this simple model can well explain the position of the maximum heat flux on the different protection limiters and the heat-flux magnitude, confirming that the parallel RF electric field and the electron plasma density in front of the antenna are the main driving parameters for ICRF-induced local heat fluxes.

• OSTI ID: 22263863
• Journal Information: AIP Conference Proceedings, Vol. 1580, Issue 1; Conference: 20. topical conference on radiofrequency power in plasmas, Sorrento (Italy), 25-28 Jun 2013; Other Information: (c) 2014 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTENNAS
DENSITY
DEPOSITION
ELECTRIC FIELDS
FIRST WALL
HEAT FLUX
ICR HEATING
ION CYCLOTRON-RESONANCE
IONS
ITER TOKAMAK
LIMITERS
MAGNETIC FIELDS
MAGNETIC SURFACES
PLASMA DENSITY
SAFETY