What's special about the Wendelstein 7-X? The number of functional stellarators is rather limited, so getting it built is a success in itself. W7-X will be the

What's special about the Wendelstein 7-X? The number of functional stellarators is rather limited, so getting it built is a success in itself. W7-X will be the largest of the bunch and is supposed to sustain plasma for up to 30min (for comparison, the record for tokamaks is 6.5min, and ITER will only add a minute or two to that).