The large tilt requirement into HEPI for the TMS tilting really accentuated the IPS sensor noise when the HEPI loop was open.  The HEPI had not been commissioned so the tilt was direct drive.  On Friday Jim, Fabrice and I closed those loops and I did my best to restore the previous tilt to the system.  We only got to within ~25urads cause the other loop closings caused more drive to the the V1 corner pushing the IPS to 29900counts with a watchdog trigger at 30000.

See the attached 8 day plot.  The plot shows lots of things but mainly look at the lower right graph with T240 INMON.  The first half of the plot is before the hepi position loops were closed.  The quieter interval in the middle left, was during a noise study and we had no tilt (see the various hepi graphs).  In the middle of the time frame we closed the ETMX HEPI position loops and you see the T240 channel go very quiet.  There are no railing spikes that would have tripped the ISI.  On Monday, Keita offloaded much of the HEPI tilt to the TMS because the HEPI IPS was close to its trip level and TMS needed a little bit more tilt.  You can see the HEPI tilt change in the channel 9 & 12 graphs.  However, there is no change in the noise at the T240 when Keita offloaded HEPI to TMS (I zoomed in and there is no difference in the time series view.)

Bottom line, The HEPI tilt will not cause ISI trips with the HEPI position loops closed.  HEPI could take much of the TMS tilt back if needed.