I added back the Beckhoff channels minus a new list of ones that appeared to be changing too quickly. This time the update rate appears reasonable. Conlog is now monitoring 97,308 channels (target_grep_channel_list_minus_fast_beckhoff.txt). The list of fast channels I removed is also attached (beckhoff_ro.txt).

Jeff B & Andres R

   We moved the HLTS suspension SR3 into position to have the metal Bottom Mass replaced with the Glass Optic. We took height and blade tip breakoff measurements as a pre-installation base line. All measurements are within tolerances. 

Measurement Point            Target/Tolerance  	                         Measurement 
Top Blade Wire Breakoff       806.12mm	                                 804.93mm, 805.89mm 
Bottom of T-Block                 552.23mm	                                 552.60mm
Top of Intermediate Mass     461.63mm	                                 461.63mm
Lower Blade Wire Breakoff   608.84mm tip coplanar <0.5mm  607.75mm, 608.11mm, Coplanar = 0.36mm
Top of Bottom Mass              291.0mm +-1mm	                         291.17mm

   The next step is to center and adjust the OSEMs, and then run Phase 2A Transfer Functions.  

Corrected daqdrc file, restarted daqd on h1nds1.

  In preparation for installing sensor correction I took a ground to platform transfer function to see what kind of coherence we have, short answer is lots from 0,1 to a few hertz

The aLOG will be down for maintenance tomorrow at noon (pacific time).

Please post or save your log entries before the maintenance.

I commented out the DC watchdog components in /opt/rtcds/userapps/release/cds/h1/alarmfiles/h1cds_iop_sus_watchdog_b123.alhConfig.

Getting alignment targets from end X and installing them on TMS at end Y.

Frame writer 1 daqd and nds1 daqd were restarted to read new daqdrc files to allow writing of raw minute files in the proper place, following moving of old files to a different file system.  

Jeff B. & Kate G.

A horizontal 4" witness plate (wafer) and horizontal 1" optic (S/N 1247) were placed near the center of the SEI table on Feb 5th. A vertical 1" optic (S/N 1245) was mounted on the HR side of SR2. A vertical wafer still needs to be set near SR2. 

Important notes: Witness samples were not placed immediately after the chamber was opened. Jeff did some cleaning before SR2 was installed and the wafers and optics were placed. Also, the 1" optics were removed from their PET G containers, put in PEEK holders, double bagged, and stuck in a bag with other tools before going in chamber. I didn't see obvious scratches in the First Contact, so hopefully the samples weren't damaged. 

Maybe Stefan turned these off, I didn't catch such in the alog.  I thought I left these in some Isolation state yesterday as Stefan wanted PRMI asap.

ITMY is damping with a Stage2 trip from GS13 limits.  The BS has no trip indicator but is damping only.

The HEPIs here are running normally.

Stefan and I found that the BS oplev was oscillating because of probably a loop instability. Disabling and enabling them at H1:SUS-BS_M2_OLDAMP_P(Y) made it stable again. It had been oscillating for more than 15 hours. The attached is the trend.

Stefan and I lowered the threshold value of the ref cav transmitted light because it was preventing FSS from a smooth recovery. It is now 0.4.

Stefan, Lisa, Kiwamu,

The X arm is now quiter due to the oplev on ETMX and we are now becoming able to assess the noise performance.

Since Stefan got the oplev active loop running on ETMX and made the arm quitter, we wanted to measure the ALS infrared frequency noise by locking the PSL to the X arm using the green beatnote. The hand off process was very smooth tonight and we could try many times to bring the PSL frequency close to the arm resonance. Stefan engaged the additive offset path on top of the MCL feedback. We measured the UGF to be 3.6 kHz with a phase margin of about 64 deg.

It seems that the CARM noise is now suppressed to ~ a few 100 Hz which is unfortunately still greater than the arm linewidth of about 84 Hz. Because the fringe moved more than its linewidth, we could not confine it within the linear range. The below is a screenshot of the PDH signal in StripTool. You can see that the PDH signal, which in blue, goes back and forth around a resonance, resulting in a periodic funny shape. Also it looked like we need to have some more gain at low frequencies because we saw a low frequency excursion in the error signal.

Even though the PDH signal was pretty much out of the linear range, we calibrated REFLAIR_A_RF45 using Alexa's formula (see alog 7054) and tentatively made a noise spectrum which, of course, underestimated the actual noise due to a low optical gain. One thing we immediately noticed was that there is a 70 Hz broad peak which maybe a vibration of the periscope on ISCT1. It looks quite similar to what we had in HIFO-Y. We are not sure what this is at this point.