Gerardo, Kyle 

After calibrating using an external helium source and with a 6.8 x 10-9 mbar*L/sec signal baseline, Gerardo sprayed an audible flow of helium for 100 seconds per flange around the two 4.5" CFF feed-throughs that had been removed and re-installed as part of the ITMy diagnostics last week -> no signal detected. 

Gerardo, Sheila

Gerardo did a Helium leak check on the the fiber feedthroughs, after each leak check we took it to the optics lab for a transmission measurement. 

In our previous transmission checks, (40681) we used the fiber coupled 1064 nm beam from the Prometheus in the optics lab, but this path has been taken apart already (for cleaning out the optics lab for HVAC work).  The 532 nm path is still available, so we used that instead. 

For SN9 we measured 88.7% transmission after the leak testing.  For SN8 we measured 98% transmission.  We will plan to use SN8 for 532 nm light, since we have had the higher transmission for that feedthrough for both tests.

(Marc Daniel)

Since we need more tuning range for the squeezer VCXO, we mounted an Aeroflex/IFR/Marconi 2023A in the squeezer rack SQZ-R1 at slot 34/35. The settings are

1. Frequency = 203.125 MHz
2. Level = 13.0 dBm
3. Modulation: 10kHz FM Ext. DC

We also cabled up a 10 MHz external synchronization line from the CER.

I just turned off the length input to MC2 from the ISC.  The shutter is closed during the PSL work, so there is no light, so we have (apparently) just been sending nonsense signals to MC2 for a long while now.  The top mass's integrator has been on, so we've been saturating the DAC for a while also as a result.  I cleared the integrator, so now MC2 can actually damp.

We should probably add this as an option to the guardian - remove MC2 actuation, without misaligning MC2 (which is what is done in the current Offline state, to prevent flashing of the cavity).

Á. Fernández-Galiana, J. Kissel, T. Shaffer

TJ and Álvaro backed off all of the newly installed OPO suspension's OSEMs from their flags in order to gather open-light current values with the final electronics. Once hooked up to the previously installed in-vacuum cabling (see LHO aLOG 40613), they lit up without problems (thanks Hugh, Corey, Nico, and Marc!).

These OSEMs must have been cherry-picked for goodness; all but one of them (V3) saturates the ADC when backed off from the flag enough that the LED is fully exposed to the PD (or they're "open lighted"). Thus, the open light current table looks a little silly, but so be it.

         Open Light Current / ct     GAIN          OFFSET     Notes
         (as ADC Counts)             (30000/olc)   (-olc/2)
H1       32767                       0.916         -16384     **Read out as "H2"
H2       32767                       0.916         -16384     **Read out as "H1"
H3       32767                       0.916         -16384
V1       32767                       0.916         -16384
V2       32767                       0.916         -16384
V3       30961                       0.973         -15481

 
**IMPORTANT NOTE: We have deviated from the cabling the H1V1H2V2 quadropus cable as designed (D1700384) and from as-built L1's OPOS (TST aLOG 11314) due to mechanical interference. This means we will have to change the top-level simulink diagram to account for this in-vac cable ordering in order to remain sane (common library parts will be unaffected by the quirk).

These values have been installed into EPICs, turned on, and accepted in the SDF system.

Ops Shift Log: 02/26/2018, Day Shift 16:00 – 08:00 (08:00 - 16:00) Time - UTC (PT)

Delayed aLOG Entry:
   The LVEA was transitioned to laser safe this morning around 18:00 (10:00). Two non-standard conditions conditions were noted: 

   (1). The SR3 OpLev transmitter has been disconnected from the chamber viewport. There is a yellow cap on the chamber viewport. 

   (2). The ISCT6 table doors were unlocked. One of the handles is installed upside down (so the handle points up when door is locked) and was very loose. The other handle is also loose. Before locking the cabinet, I tightened up the upside down handle but did not reinstall it.   

Á. Fernández-Galiana, B. Gateley, C. Gray, J. Kissel, T. Shaffer

Many more details to come, but Álvaro, Corey, and TJ installed the new H1 Optical Parametric Oscillator Suspension (OPOS) this morning (with Bubba as safety consult, and me as photographer.

I attach my the highlights of my pictures from the activity as direct images below. All pictures are collected, scaled down, and merged into a .pdf also attached.

Notes: 
- During the install, we had to move 
    - the OMC TRANS path beam dump that was in the -X, -Y corner of the table (it was in the old position, and will need to be moved anyway)
    - A ballast mass that was (unbolted and) shoved against AS WFS A. The table needs to be rebalanced anyway, so this it's a big deal.
    - The second iris (closest to the OPOS and/or the future position of ZM1) capturing the beam path into HAM5. The location has been scribed in order to (hopefully) reproduce the position to high accuracy. See .pdf for detailed pictures of this. This will be re-installed omce we finalize the location of the OPOS and place ZM1.

- In order to successfully attach the installation lifting fixture to the OPOS, we had to remove a V-dump from one corner of the optical bench. This dump (and its near interference) is shown highlighted in the second picture (IMG_3648.jpg). This will be re-installed shortly.

WP 7373

I made a mistake and changed the calibration for PT246B when it should have been PT245B, so I had to restart the code again after fixing that. Other than that, things seem to have gone smoothly. Burtrestored to 6am this morning.

To facilitate vacuum bake/installation work at MY, the interlocks for GV-11 and GV-12 were shorted to 24V. Jumpers are to be removed once ongoing work is completed.

Jumpers are across terminal block pins 182/183 and pins 188/189.

WP 7375

Output voltage for the PZT ISC/SQZ power supply was increased from 100V to 110V.

TITLE: 02/26 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Cheryl out sick, so her shift is being covered by multiple people (I covered morning & Patrick/Jeff will also help with coverage).

LOG:

•  15:51-15:59 Mark D at EY. --DONE
• 15:47 Reset Dust  #10 in LVEA (Jeff) --DONE
• 16:10 Ken to EX for Access System work, may cause access system alarms
• 16:25 Getting tools from H2 PSL room (Rick) --DONE
• 16:38 Looking for parts in LVEA (TJ) --DONE
• 17:35 EY stuff to EX all day (both Marks)
• 17:45 Transitioning LVEA to Laser SAFE (Bartlett)
• 18:06 CP4 work (Chandra)
• 18:06 Connecting HAM6 VOPO In-air cables to the roof flange (Hugh)
• 18:10 VOPO prep in Optics Lab (TJ, Alvaro)

The good news is that it looks like someone must have set our seismic system to the Large EQ mode before this morning's EQ hit, and none of the seismic systems are tripped now, the ISIs are set to damped with feedforward off and sensor correction seems to be off.  

ITMY suspension was unfortunately set to safe, I assume this is left over from the fix earlier in the week.  The attachment shows a comparison of ITMX and ITMY top mass osems (ITMY oplev beam is not on the QPD in safe mode) during the EQ, ITMY was swinging by more than 60 urad peak to peak while ITMX which had suspension damping loops engaged was swinging by about 20 urad at most. 

I've turned on the damping on ITMY now.  I also hit the button RECOVER EQ on the ISI_CONFIG screen, I got some errors from the script but it did take the ISIs to the windy state (screenshot attached).

 It might be good to add to the operator tasks a check that suspensions and ISIs are in a good state before leaving for the night or weekend.  (ie, if suspensions are not damped, operators could make sure they know that it is intentional and there is a good reason for it).  Leaving our suspensions damped as much as possible will help us avoid some problems similar to what we had after the Montana EQ last summer.  (For reference, while the suspensions were undamped during that EQ they were moving by 10,000 urad peak to peak, so this EQ is not really comparable.)