"Cecil Moore" wrote
...

If electrons (carriers) are not being accelerated and/or decelerated,
i.e. if DC steady-state exists, then there are no EM waves.

You do not read my posts.

In the free electron laser the DC steady-state exists and there are electric
waves.
"If the electron beam is periodically deflected the current is DC but the
all
works like the dipole."
S*