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Using Profile Diagnostics S.A. Bozhenkov1, G. Fuchert1, H. Niemann1, M. Beurskens1, Y. Feng1, O.P. Ford1, J. Geiger1, M. Hirsch1, U. Höfel1, M.W. Jakubowski1, J. Knauer1, P. Kornejew1, A. Langenberg1, H.P. Laqua1, H. Maassberg1, N.B. Marushchenko1, D. Moseev1, N. Pablant2, E. Pasch1, K. Rahbarnia1, T. Stange1, J. Svensson1, H. Trimino Mora1, P. Valson1, G.(More)
The performance of the Wendelstein 7-X (W7-X) stellarator during the first experimental campaign (OP1.1) is explored using measurements from the x-ray imaging crystal spectrometer (XICS) diagnostic. During OP1.1 plasmas have been produced in a limiter configuration, with up to 4.3 MW of ECH power. The XICS system is designed to provide high-resolution(More)
Wendelstein 7-X is an optimised stellarator designed for steady-state operation. The only steadystate capable heating system is electron cyclotron resonance heating (ECRH) launching microwaves at 140GHz into the vessel corresponding to the 2nd harmonic of the electron cyclotron frequency at 2.5 T. A quasi optical transmission line is used to bring the power(More)
Fusion energy research has in the past 40 years focused primarily on the tokamak concept, but recent advances in plasma theory and computational power have led to renewed interest in stellarators. The largest and most sophisticated stellarator in the world, Wendelstein 7-X (W7-X), has just started operation, with the aim to show that the earlier weaknesses(More)
Wendelstein 7-X, a superconducting optimized stellarator built in Greifswald/Germany, started its first plasmas with the last closed flux surface (LCFS) defined by 5 uncooled graphite limiters in December 2015. At the end of the 10 weeks long experimental campaign (OP1.1) more than 20 independent diagnostic systems were in operation, allowing detailed(More)
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