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• W2890416903 abstract "In this work, studies with respect to the exhaust problem were performedin the stellarator experiment Wendelstein 7-X with different target concepts and different magnetic field geometries. Different infrared cameras were used to study the heat flux from the plasma onto the PFC. In the first publication, the limiter set-up was used with a simpler magnetic topology in the plasma edge. The radial fall-off of the parallel heat flux for inboard limiters in W7-X shows, similar to inboard limiters in tokamaks, two different radial fall-off lengths, a short (narrow) one, characterizing the near-SOL, and a long (broad) characterizing the far-SOL. For the far-SOL, the heating power and connection length have been identified as the main scaling parameters, while for the near-SOL, the electron temperature close to the LCFS has been identified as the main scaling parameter. The two fall-off lengths differ by a factor 10, and the found scalings for both regimes differ from known models and experimental scalings in tokamaks. A turbulent-driven feature was discussed in the publication as a possible explanation for the behavior of the fall-off length in W7-X.The gained information and data have been further used to support manyother publications, covering the symmetry of the heat loads, theenergy balance of the machine, and seeding experiments.The heat exhaust in W7-X with an island divertor was studied in the secondand third publication. Definitions of parameters such as peaking factor andwetted area were applied for the heterogeneous heat flux pattern on theW7-X divertor. It was shown that the island divertor concept is capableof spreading out the heat efficiently, resulting in large wetted areas of up to 1.5 m2. The reached values for the wetted area are comparable to the ones of the larger tokamak JET but with a much smaller ratio of wettedarea to the area of the last closed flux surface. Furthermore, a positivescaling of the wetted area with the power in the SOL was observed. Thisscaling is beneficial for future reactors but needs further investigation of the involved transport processes. The peaking factor (discussed in the second publication) describes how concentrated the heat load is within the region of the strike line. It was shown that this factor is decreasing for increasing densities without affecting the wetted area. The present work paves the way for further analysis of the transport processes of the heat flux towards the island divertor of Wendelstein 7-X." @default.
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• W2890416903 date "2017-01-01" @default.
• W2890416903 modified "2023-09-26" @default.
• W2890416903 title "Power loads in the scrape-off layer of Wendelstein 7-X" @default.
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