Abstract
Development of a plasma facing module using Cold Isostatic Pressing Graphite (CIPG) was successfully achieved for use in driving a heat-resistant Lower Hybrid Current Drive (LHCD) antenna. A thin stainless film (10μm), a molybdenum film (10μm), and a copper film (50μm) were overlaid on the CIPG materials, the CIPG surfaces were successfully coated with the Cu-layer by diffusion bonding method. This module whose length is 206mm, has four waveguides, and a water cooling channel. High rf-power long pulse operations with water cooling were successfully tested up to 250kW (125MW∕m2)∕700s, a stationary temperature and vacuum pressure was performed. But the maximum rf transmission power was limited to 47MW∕m2 for a plasma facing module using Carbon Fiber Composite (CFC) due to poor Cu-plating, a power density large by more than a factor 2.5 was achieved with the CIPG module. The rf power density which meets the requirement of the rf electric field of 5kV∕cm for a design of the LHCD antenna in International Thermonuclear Experimental Reactor (ITER) was successfully performed.
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