ITER ECH Transmission Line System Design and Status

Conference · Fri Nov 01 04:00:00 EDT 2024

DOI:https://doi.org/10.1051/epjconf/202431304004· OSTI ID:2480047

Hanson, Gregory ^[1]; Wolfe, Zachary C. ^[1]; Kaufman, Michael ^[1]; Hale, Zackary ^[1]; Dukes, Carl Lee ^[1]; Shanmugasundaram, Aravind ^[1]; Casal, Natalia ^[2]; Gandini, Franco ^[2]; Goodman, Timothy ^[3]; Henderson, Mark ^[4]; Schaich, Charles Schaich ^[5]; Takahashi, Koji ^[6]

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1. ORNL
2. ITER Organization, Saint Paul Lez Durance, France
3. Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), Lausanne, Switzerland
4. UK Atomic Energy Authority (UKAEA)
5. GEM Technology International
6. National Institute for Quantum and Radiological Science and Technology, Naka-shi, Japan

The electron cyclotron (EC) heating & current drive (H&CD) system on ITER provides plasma heating by generating, transmitting, and launching high-intensity, high-frequency (170 GHz) electromagnetic wave energy steerable across the plasma cross-section. The transmission line (TL) subsystem connects the Matching Optics Unit (MOU) on each of the 24 gyrotrons to the 32 feed points in the four upper launchers and the 24 feed points in the equatorial launcher. Each TL must be able to operate at up to 1.2 MW of input power for up to 1 hour pulse lengths. The TL system contains 50 mm water-cooled corrugated waveguide, 90o miter bends, 140o miter bends, polarizer miter bend pairs, switches, expansion units, pumpouts, DC breaks, MOU-TL adapters, Radio Frequency (RF) loads, and isolation shutter valves. A detailed finite element analysis has been used to verify the thermo-mechanical performance of each component. The microwave performance has been analyzed using a 2-D electromagnetic code combined with a Monte Carlo code. This approach allows the impact of manufacturing and installation tolerances to be assessed and optimized to provide a high probability of achieving the system performance requirements. Prototypes of the waveguide and TL components have been fabricated and tested at high-power. Production contracts are now being issued for fabrication and delivery of the waveguide and components to ITER.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 2480047
• Country of Publication: United States
• Language: English