Full conversion from ohmic to runaway electron driven current via massive gas injection in the TCV tokamak. (1st July 2022)

• Record Type: Journal Article
• Authors: Decker, J.; 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.; the TCV Team, ; the EUROfusion MST1 Team,
• Is Part Of: Nuclear fusion. Volume 62:Number 7(2022)
• Publication Date: 2022-07-01
• Subjects: runaway electron -- disruption -- massive gas injection -- tokamak -- neon -- elongation -- runaway electron beam; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/ac544e
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Full conversion from ohmic to runaway electron (RE) driven current was observed in the tokamak à 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 κ = 1.5. A reproducible scenario for RE beam generation without loss of circulating current is of particular interest for disruption modelling applications.