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New records at Wendelstein 7-X

On October 18th 2018, the second experimental phase ended successfully in the world's most advanced stellarator fusion experiment - Wendelstein 7-X in Greifswald.

On October 18th 2018, the second experimental phase ended successfully in the world's most advanced stellarator fusion experiment - Wendelstein 7-X in Greifswald. The aim was to prepare the final stage of completion with water-cooled wall elements and plasma burn times up to 30 minutes. Jülich scientists, technicians and engineers were instrumental in achieving this goal. With Jülich's expertise and technology, as well as scientific experiment management, some new record results were achieved. According to a process developed in Jülich, the inner wall of the reactor was coated, which enabled a factor of 3 higher density and a higher purity of the plasma. For the first time, plasma burn times of up to 55 s were generated, pushing the limits of the performance of the still uncooled wall. The proof of the reduced impurity content was achieved with complex optics developed at Jülich. This provides light of characteristic wavelengths from the edge of the plasma. Jülich scientists have developed various simulation models to evaluate the measured data and to predict the plasma parameters, especially near the wall. After the end of the experiment phase, wall elements made of Wendelstein 7-X are analyzed in Jülich laboratories to investigate the effects of plasma operation on them. For the experimental phase planned after the complete assembly of Wendelstein 7-X, Jülich researchers are developing a versatile manipulator with which both measuring probes and cooled wall elements can be brought into the plasma for test purposes, as well as associated observation systems. This will test candidates for future reactor walls and new wall materials developed at Jülich.

bild_forschung_W7-X_05_11_2018_endoskop

The picture shows an image taken by Jülich optics of helium injected into the plasma edge. From this, the density and temperature at the plasma edge can be determined.

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