[Xrayops] Change in SR RF phase yesterday afternoon

[APS Experiment Hall X-ray Operations Problem List]

A change in the RF source yesterday afternoon around 16:15 resulted in a 
SR RF phase phase shift of about 23 deg. Operations adjusted the SR RF 
phase to recover top-up injection efficiency. . From that time to 
approximately 04:00 this morning the phase may have been slightly less 
stable than it normally is. The RF source appears to be stable after 
04:00 so the phase should be stable, but one of the RF source parameters 
did  not return to its nominal value. We do not see any effects on the 
electron beam--no increased motion and no apparent instabilities. The RF 
Group are set up to troubleshoot the problem, but there is nothing that 
can be done during User operations since it might affect the beam or 
possibly cause a beam loss. We will keep you informed if there are any 
changes. Please feel free to e-mail me at schroedr at anl.gov if you have 
any questions.

Thanks,
Karen Schroeder
Storage-Ring Chief of Operations