Analysis of edge magnetic field line structure in ITER due to in-vessel ELM control coils

► ITER ELM coils design was evaluated based on two metrics: the Chirikov vacuum magnetic island overlap parameter, and the vacuum Field Line Loss Fraction. ► The study was performed for a range of current amplitudes for three different n=4 waveforms: square, cosine and sine. ► The Field Line Loss an...

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Bibliographic Details
Published in:Fusion engineering and design 2012-09, Vol.87 (9), p.1536-1543
Main Authors: Orlov, Dmitri M., Evans, Todd E., Moyer, Richard A., Schaffer, Michael J., Schmitz, Oliver, Loarte, Alberto
Format: Article
Language:English
Subjects:
Coils
Design engineering
Elm
Flexibility
ITER
Magnetic fields
Magnetic islands
Non-axisymmetric magnetic perturbations
Steady state
Stochastic magnetic field lines
Tokamaks
Waveforms
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Summary:► ITER ELM coils design was evaluated based on two metrics: the Chirikov vacuum magnetic island overlap parameter, and the vacuum Field Line Loss Fraction. ► The study was performed for a range of current amplitudes for three different n=4 waveforms: square, cosine and sine. ► The Field Line Loss analysis showed that edge vacuum stochastization might be achieved that is similar or greater than in DIII-D. ► Fault analysis of the ITER ELM coils was performed for the first time with up to 11% of dead coils. ► Magnetic footprints were modeled on the divertor targets providing data to fluid codes for calculating the distribution of heat loads. In this work we evaluated the ITER ELM coils design based on two metrics: the Chirikov vacuum magnetic island overlap parameter, and the vacuum Field Line Loss Fraction. The study was performed for a range of current amplitudes for three different n=4 waveforms: square, cosine and sine. The results indicated that ITER ELM coils are designed with a high level of flexibility to accommodate different operation scenarios (H-mode and Steady State) with different values of q95 and q-profiles. The magnetic island overlap analysis showed that ITER ELM coils are capable of matching the DIII-D I-coil spectrum. The Field Line Loss analysis showed that edge vacuum stochastization might be achieved that is similar or greater than in DIII-D. Fault analysis of the coils indicated that ITER ELM coils are robust and show good characteristics even with 11% of dead coils.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2012.01.029