Ion-chamber measurements of the photoionization produced by point-to-plane corona discharges in air, oxygen, and nitrogen (commerical grade) over a pressure range of 0.1 to 18 Torr are reported in this paper. The results are expressed in a generalized form that reduces the data for each gas to a single curve relating photoionization to pressure (p) times distance (R) from the discharge. The range of Rp values is between 1 and 550 cm Torr. Absorption coefficients are compared to those reported by other investigators by plotting absorption coefficient/pressure vs Rp. In air and oxygen the values fall along a common curve. These results indicate that relating the ion-chamber currents to Rp in the manner described in this paper may provide a useful basis for calculating the photoionization produced by discharges in these gases.

Zedimensional finite elements are used to help directly incorporate models of nonlinear power electronic switching devices into nonlinear transient magnetic finite element analysis. Iko applications are considered: a buck regulator circuit and a transformer feeding a rectified load.

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