Hender, T. C.Howell, D. F.Buttery, R. J.Sauter, O.Sartori, F.La Haye, R. J.Hyatt, A. W.Petty, C. C.2008-04-162008-04-162008-04-16200410.1088/0029-5515/44/7/010https://infoscience.epfl.ch/handle/20.500.14299/22082WOS:0002231528000105478Joint experiments have been conducted on JET and DIII-D to study m = 2, n = I neo-classical tearing modes (NTMs). Very similar instability behaviour is observed on both machines and the scaling of the mode island width with beta and the observation of n = I islands at q = 2, strongly points to these modes being driven by neo-classical effects. Identity experiments using closely matched non-dimensional parameters (plasma shape, aspect ratio, q, p* and collisionality) on JET and DIII-D show similar global beta-limits for the NTM. Further scalings, which combine broader data sets from JET and DIII-D, show an approximately linear scaling, or slightly stronger, with ion gyro-radius and a relatively weak dependence on collisionality.JETtext::journal::journal article::research article