Why should the high voltage output end of microwave oven transformer be connected with silicon steel sheet?

1, the high-voltage winding of microwave oven transformer, the secondary output constitutes a voltage doubling rectifier circuit, and the high-voltage electricity is output for the magnetron to work.

2. Because the shell of the magnetron is an electrode, one end of the output end of the high voltage transformer should be grounded. Please see the attached drawings:

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