July 27, 2015 to August 21, 2015
Nordita, Stockholm
Europe/Stockholm timezone

Current evolution within magnetic islands that are forced to shrink with electron cyclotron current drive

Aug 14, 2015, 3:45 PM
FD5 (FD5)



Oral Workshop, August 10-14 Afternoon V


Dr Jane Pratt (University of Exeter Astrophysics)


When a fusion plasma is above a critical value of beta, neoclassical tearing modes are destabilized. The resulting magnetic islands can grow to large size, allowing fast escape of the plasma from the fusion machine. The primary tactic for preventing tearing modes and reducing the size of magnetic islands in fusion machines is to apply current inside the magnetic islands. In ITER, this will be done using electron cyclotron current drive. To study the stabilization processes inside an island in detail, we have extended the JOREK code[1], a three- dimensional compressible non-linear MHD code that simulates a realistic tokamak geometry, to include two coupled equations for the applied current. We describe the evolution of the applied current, and analyze how it spreads along surfaces of constant magnetic flux inside the magnetic islands. [1]Huysmans, G. T. A., and O. Czarny. ``MHD stability in X- point geometry: simulation of ELMs.'' Nuclear fusion 47.7 (2007): 659.

Primary author

Dr Jane Pratt (University of Exeter Astrophysics)


Dr Egbert Westerhof (DIFFER (Dutch Institute for Fundamental Energy Research))

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