1 - Nuclear Sciences and Applications - IAEA

678 SIMONEN et al.
occurs near the plasma edge. As seen in Fig. 8(e), helicity is nearly invariant
across the transient. The wiggles during the transient are due
in part to averaging during the dynamic phase and in part to neglected
dynamic terms in the helicity conservation equation [24j. We believe this
is the first documented observation of magnetic hehcity invariance in a
tokamak.
The authors would like to thank our DIII-D colleagues for assistance
in carrying out and interpreting these experiments. In addition, we wish
to acknowledge valuable discussions with T.H. Jensen, J. Kesner, M.E.
Mauel, M. Shimada, and A.M.M. Todd.
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