Wendelstein 7-X: Upgrading after successful first round of experiments

After about 2,200 plasma pulses since operation began in December 2015 the first experimental campaign on the Wendelstein 7-X research device at Max Planck Institute for Plasma Physics (IPP) in Greifswald was successfully concluded in March. Modifications in the plasma vessel are now proceeding to make the device fit for higher heating powers and longer pulses. Wendelstein 7-X, the world's largest fusion device of the stellarator type, is to investigate the suitability of this configuration for