Ryan, Jane, Adrian, Anamaria, Robert

We have completed the main program of PEM injections. The more than 130 hand-tuned injections are detailed in the attached spreadsheet, which, along with the automated injections, will be analyzed in the comming days. We did not find troubling magnetic coupling, but we did find certain areas, particularly EX and the PSL, where ambinet vibration levels can produce noise in DARM. For some of the sensitive frequencies we found, e.g. 4Hz, and 10Hz, the ambient vibration level is dominated by the HVAC, particularly, turbulence in the turbine plenums and in the chilled water pipes. Tomorrow, I plan to experiment with the turbine flows and the pump VFDs to see if we can reduce vibration levels at the sensitive locations and frequencies with reasonable changes in the air and water flows.