This note will calculate the idealized performance of
echo-enabled harmonic generation performance (EEHG),
explore the parameter settings, and look at constraints determined
by incoherent synchrotron radiation (ISR) and intrabeam scattering (IBS).
Another important effect, time-of-flight variations related to transverse
emittance, is included here but without detailed explanation
because it has been described previously.
The importance of ISR and IBS is that they lead to random energy shifts
that lead to temporal shifts after the various beam manipulations
required by the EEHG scheme. These effects give competing constraints
on the beamline. For chicane magnets which are too compact for a given
R56, the magnetic fields will be sufficiently strong that ISR will
blur out the complex phase space structure of the echo scheme
to the point where the bunching is strongly suppressed.
The effect of IBS is more omnipresent, and requires an overall compact
beamline. It is particularly challenging for the second pulse in a
two-color attosecond beamline, due to the long delay between the
first energy modulation and the modulator for the second pulse.