Snubber for EAST neutral beam injector

According to the B-H curve and structure dimensions of the Snubber, induction voltage and eddy current of any core lamination with the thickness of saturated regions are derived by referring to Fink’s method, when accelerator breakdown occurs at the Experimental Advanced Superconducting Tokamak(EAST). Using Ampere’s law, in each core tape, the eddy current and the thickness of saturated regions are deduced. And then, the equivalent resistance of the Snubber is obtained. The transient eddy current due to stray capacitance is analyzed, and the exponential time constant and the arc current are obtained. Then the maximum width of the lamination and the minimum thickness of the core tape are 28 mm and 114 μm, respectively. The obtained experimental time constant is approximately the same as