Observations of the magnetohydrodynamic dynamo effect in a spheromak plasma

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Abstract
We present measurements of the magnetohydrodynamic ‘‘dynamo’’ due to correlated fluctuations of velocity and magnetic field in the SPHEX spheromak. We show that there are both single-mode and turbulent dynamo processes present, although the single-mode process is in this case an ‘‘antidynamo’’ opposing the externally applied electric field. The size of the turbulent dynamo at the magnetic axis is close to that required to drive the toroidal current there.