Hi everyone,

I’m trying to use POPD operand to acquire the coupling value (data 0) in my model.

For some unknown reason when I use POPD in the merit function I get zero coupling (or close to zero) value.

However this comes in contrast to the values I see in the POPD module where I get close to 99%  coupling value.

Please note I have verified the beam position and size to be close to nominal values.

In addition it seems there is no surface dependency and the problem occurs for every surface in the model.

Has anyone encountered such an issue in the past?

I would appreciate any help with this issue.

Thank you.