The design originated as a single slot Undulator shield and was so successful, that it was graduated to the dual slot system shown above, which enabled full pass-through of the Hall Probe.
The probe needed to pass through the shield lengthwise. By equating the flange width to “end effects” on a cylinder, and with an understanding of the customer’s application, we applied tubulation theory to a slot configuration to reduce fringing and end effects.
Note the Magnetic modeling image – confirmed what extensive testing proved.