Decker, J. W. Q. S. A. Z. X.Papp, G.Coda, S.Duval, B. P.Sheikh, U.Blanchard, P.Choi, D.Galperti, C.Calacci, L.Carnevale, D.Ficker, O.Gobbin, M.Labit, B.Macusova, E.Mlynar, J.Plyusnin, V.Sauter, O.2022-06-062022-06-062022-06-062022-07-0110.1088/1741-4326/ac544ehttps://infoscience.epfl.ch/handle/20.500.14299/188381WOS:000797190700001Full conversion from ohmic to runaway electron (RE) driven current was observed in the tokamak a configuration variable (TCV) following massive injection of neon through a disruption mitigation valve into a low-density limited circular plasma. Following a partial disruption, a stable 200 kA RE beam is maintained for more than 1 s. Controlled ramp-down of the RE beam with adjustable decay rate was demonstrated. Control of the beam vertical position was achieved down to a RE current of 20 kA. RE beam formation is observed in elongated plasma configurations up to kappa = 1.5. A reproducible scenario for RE beam generation without loss of circulating current is of particular interest for disruption modelling applications.Physics, Fluids & PlasmasPhysicsrunaway electrondisruptionmassive gas injectiontokamakneonelongationrunaway electron beamtext::journal::journal article::research article