Any one know how the magnetic field was measured? 0.4 Gigagauss is extremely large for a pinch device. A typical pinch radius is ~0.5 cm. The current that FF-1 seems to be operating at right now is ~ 1 MA. B=mu_0*I_peak/(2*pi*r) where B is the magnetic field, mu_0 is the permeability of free space and r is the pinch radius. I calculate a B-field behind the pinch of 0.4 mega gauss. I’ve run across filaments in pinch literature that are 1/10 the pinch diameter but that is only 4 megagauss.
