Abstract
A new design of the ITER divertor Langmuir probe (DLP), called “full-tungsten design”, has been proposed and analyzed. This new design addresses the poor thermal fatigue of the copper brazing layer of the previous DLP design. Tungsten is used as the heat shield material instead of the former copper alloy brazing layer in this full-tungsten design because of its relatively high strength, high melting point and good thermal conductivity. After structural optimization, the analysis results show good thermal and mechanical behavior, indicating the full-tungsten design is robust enough to satisfy ITER requirements. The R&D work of prototypes demonstrates the feasibility of manufacturing technology on machining complex tungsten components and tungsten-ceramic-tungsten brazing. In order to verify the design and brazing technology of DLP, high heat flux tests were undertaken using an electron beam device with an incident power of 15 MW/m2. The testing results show that the prototypes can survive under such harsh working conditions with the present structure and manufacturing technology.
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