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The LCLS-II RF system physically spans ~700m and has strict requirements --on the order of 20 fs -- on the phase stability of the accelerating RF fieldsin its SRF linac. While each LLRF rack is crudely temperature-stabilized, theweather inside the service building as a whole is usually compared to a tinshack in the California sun. A phase-averaging reference line is the primarysystem deployed in support of the phase stability goals. There are other,secondary subsystems (SEL phase offset, and determination of cavity detuning)that are also sensitive to RF phase drift. We present measurements of phaseshifts observed in the overall RF system, and how diagnostics are able to senseand correct for them during beam operations.

Drift Observations and Mitigation in LCLS-II RF