Reciprocating probe measurements in the test divertor operation phase of Wendelstein 7-X

Commissioning of the magnetic diagnostics during the first operation phase at Wendelstein 7-X

during the first operation phase at Wendelstein 7-X K. Rahbarnia1, T. Andreeva1, A. Cardella2, B.B. Carvalho3, M. Endler1, D. Hathiramani1, J. Geiger1, O. Grulke1, S. Lazerson4, U. Neuner1, J. Svensson1, H. Thomsen1, A. Werner1 and Wendelstein 7-X Team 1 Max-Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17489 Greifswald, Germany 2 Fusion for Energy, Boltzmannstr. 2, 85748 Garching, Ge...

Island divertor experiments on the Wendelstein 7-AS stellarator

A promising new operational regime on the Wendelstein stellarator W7-AS has been discovered, fulfilling the conditions of optimal core behavior in combination with edge parameters suitable for successful divertor scenarios. This regime, the high density H-mode (HDH), displays no systematically evident mode activity, and is edge localized mode (ELM)-free. It is extant above a power-dependent thr...

Wendelstein 7-X and fusion

The Set of Diagnostics for the First Operation Campaign of the Wendelstein 7-X Stellarator

Wendelstein 7-X (W7-X) is a large optimized stellarator (B=2.5T, V=30m) aiming at demonstrating the reactor relevance of the optimized stellarators. In summer this year (2015) W7-X will begin its first operation phase (OP1.1) with five inertially cooled inboard limiters made of graphite. Assuming the heat loads can be spread out evenly between the limiters, 1 second discharges at 2 MW of heatin...

Key results from the first plasma operation phase and outlook for future performance in Wendelstein 7-X

The first physics operation phase on the stellarator experiment Wendelstein 7-X was successfully completed in March 2016 after about 10 weeks of operation. Experiments in this phase were conducted with five graphite limiters as the primary plasma-facing components. Overall, the results were beyond the expectations published shortly before the start of operation [Sunn Pedersen et al., Nucl. Fusi...