Chiara, Jenne.

Today we tried new measurements for the ISI CPS DIFF in a configuration where both HAM2 and HAM3 in X direction and HAM4 and HAM5 in Y directions were ON. Also ITMY_Y and ITMX_X were locked together for the MICH configuration. BS was not locked to HAMs. We looked at PRCL, SRCL, MICH and also DARM in ALS  configuration.

Results are shown in attachments: green traces represents the actuation system ON, while the OFF system configuration is in blue traces. Ground motion today was not bad because it was not windy, so less actuation was needed. PRCL, SRCL, MICH and DARM don't show a great improvement but it's important to notice that, as a first test on DARM and SRCL with both HAM and BSC chambers locked, it doesn't show any worse condition with respect to the system OFF.

We left the system ON.

We are also going on in building the guardian, which can be found under the name of ISI_DIFF. All modifications have been svn committed. We added two different DOWN states, one to swich *everything* OFF and one to switch only the LSC signals OFF, keeping CPS ON. We also made sure that the common limiters can switch ON after checking that everything else has been safely set OFF previously.