TJ, LouisD, TonyS, DriptaB, FranciscoL

There was an unexpected "bump" on PcalX at around GPS 1395546818. This was shortly after TJ attempted Detchar safety injections (76727).

Looked into H1:CAL-PCALX_TX_PD_OUT, RX_PD_OUT, OFS_PD_OUT, OFS_AOM_DRIVE_MON_OUT and OFS_ERR_OUT for any issues.

Observations:

• Bump travels across spectrum from 0 Hz to 120 Hz for an indefinite amount of time. The figures "PcalX_DTT_120.png", "...85.png", and "...40.png" illustrate the bump appearing at 120 Hz, 85 Hz, and 40-ish Hz, respectively.
• OFS_ERR_OUT sees the bump at what seemed to be a loop troubleshooting. The top plot on "PcalX_DTT_zoom_ERR.png" shows the bump appearing at ERR_OUT.
• Troubleshooting did not solve the issue. We did not see any bumps this morning so the issue seems to be gone.

Some ideas on where to look for the source:

• AOM issues
• "RF whistling"

There was a similar issue on (70817) where the "OFS servo was saturating" after Detchar injections. The OFS was not happy after troubleshooting this time.

Further investigation is on process.