PT Unknown AU Wilde, F Oosterbeek, H Marsen, S Stange, T Laqua, H Wolf, R Avramidis, K Gantenbein, G Pagonakis, I Illy, S Jelonnek, J Thumm, M TI Measurements of satellite models in 140 GHz Wendelstein 7-X gyrotrons: An approach towards an electronic stability control PY 2017 LA english ER