Rzesnicki, T.Albajar, F.Avramidis, K. A.Chelis, IGantenbein, G.Hogge, J-PIlly, S.Ioannidis, Z. C.Jelonnek, J.Jin, J.Leggieri, A.Legrand, F.Pagonakis, I. GrSanchez, F.Thumm, M.2022-12-052022-12-052022-12-052022-01-0110.1109/IRMMW-THz50927.2022.9896073https://infoscience.epfl.ch/handle/20.500.14299/193019WOS:000865953000555The upgraded EU 1 MW, 170 GHz continuous wave (CW) industrial prototype gyrotron (TH1509U) for Electron Cyclotron Resonance Heating and Current Drive (ECRH&CD) in ITER was tested at the Karlsruhe Institute of Technology (KIT). The gyrotron surpassed the performance of the previous TH1509 tube. In particular, TH1509U delivered (i) 0.9 MW in 180 s pulses (max. pulse length of the KIT test stand) and (ii) more than 1 MW at a pulse length limited to 40 s, due to a problem with the test stand cooling circuit at that time. In addition, it was possible to demonstrate gyrotron operation at (iii) 0.5 MW in 1600 s pulses.Engineering, Electrical & ElectronicMaterials Science, MultidisciplinaryOpticsPhysics, AppliedEngineeringMaterials SciencePhysicstext::conference output::conference proceedings::conference paper