# Is this way of plotting AC current gain in LTspice correct?

I want to plot the AC current gain versus the collector current in common base configuration. Ac current gain "alpha ac" for CB configuration is defined as the change occurring in collector current IC for a given change in emitter current IE when Vcb is held constant.

But if I apply AC signal to the input the current will change, and so will the collector-base voltage Vcb will change.

So the only way to hold Vcb constant I shorted the load as shown below and increased IE from 1mA to 100mA in transient analysis in one second, and plotted the expression:

AC current gain D(-Ic(Q1))/D(Ie(Q1)) versus collector current.

Is this way of doing it in transient analysis correct?