Hello dear L.Durrani

Thanks for your answer.

best regards.

There is no difference really and they are the same. It is your distinction on how to represent the unit. As you know the emittance is the area of the particle phase/trace space. The total area of the ellipse is pi*a*b. when you state the unit by pi you mean that the value is the total area of the ellipse.

Hi dr shekari,

thanks for your complete reply.

The best.