Andres and Jeff working on SR2

Working on ACB with Apollo.

• Longitudinal: -0.4 mm
  • Tolerance: ±3.0 mm
• Lateral: +0.1 mm
  • Tolerance: ±1.0 mm
• Vertical: -0.3 mm
  • Tolerance: ±1.0 mm
• Pitch: 645 µrad down
  • Target: 639 µrad down
  • Error: 6 µrad down
  • Tolerance: ±100 µrad
• Yaw: 80 µrad CCW
  • Target: 0 µrad
  • Tolerance: ±100 µrad

Also measured & aligned the ERMy (Note: the ERMy is aligned parallel to the AR surface of the ETMy) and measured the gap between the ETMy and ERMy.

• ETMy/ERMy Gap: 5.05 mm
  • Tolerance: ±0.25 mm
• ERMy Pitch: 1.671 mrad down
  • Target: 1.971 mrad down (to match the ETMy AR surface)
  • Error: 300 µrad up
  • Tolerance: ±1.47 mrad
• ERMy Yaw: 245 µrad CW
  • Target: 80 µrad CCW (to match ETMy AR surface)
  • Error: 325 µrad CW
  • Tolerance: ±1.47 mrad

Mitchell, Scott (Apollo)

The assembly of the Arm Cavity Baffle was completed yesterday. Final weights need to be taken then, it will be suspended from the solid stack to begin balancing.

It had the usual problem of asking me to choose a run time system in the active and run step, and not being able to log in.  
I also did an svn update, and got a message about the redoubt certificate. 

Lisa, Stefan

To get the PRMI locking we had to turn off all 2-stage ISIs.

With the 1-day old heating of ITMY at 1.5W, and an alignment tweak, we got 6000cts of POP18. Unfortunately I am not 100% sure how much of that is alignment, and how much is heating.

At UTC 08:4:33 we turned the ring heater to 4Watt total (2Watt each).

I believe the ITMX optical lever signals are calibrated in urad. If that's the case, the ITMX PIT motion right now is 0.3 urad RMS  (this is with the ISI in the configuration Rich left it in).

All the RMS comes from 0.1 - 0.7 Hz and I see 1 urad / sqrt(Hz) @ 0.5 Hz. 

This is significantly worse than ETMY/ITMY motion during the one arm test (0.2 urad/ sqrt(Hz) and 0.3 urad / sqrt(Hz) @ 0.5 Hz T1200450), and normal operations at LLO (0.4 urad RMS, and 0.05 urad/ sqrt(Hz) at 0.5 Hz - LLO log 8637).

Need to double check that I am comparing apples to apples.

Have(had) both ISIs running, RichM took over on the BS.  Have both running at lvl3 with blends of T100mHz.44NO on X & Y and T250 elsewhere on stage1. 250mHz on Stage2.  Decided to try the T40mHz.44NOs on ITMy and they work.  They aren't available on the BS now but with them on on the ITMY there is more lower band green on the BLRMS.  Toggled the Stage2 blend to a fro 750 vs 250 mHz and at the cost of some higher frequencies, the lower bands on the stage2 are greener with higher blend.  Maybe due to the blending bump?

Sheila, Paul

We restarted the PSL after the power watchdog tripped.  (to do this we transitioned the enclosure to science mode).  After the laser had been on for about 15 minutes I thought it would be OK to try to align the ref cav (the trans power had dropped to 0.75 V in the last few days).  
Before the AOM we had 31mW,( measured with the filter in) 30.5 after the first pass, and 18.6 after the second pass.  (60% double pass diffraction efficiency).  I tried to improve this my adjusting the alignment of the retroreflecting mirror, but wasn't able to get any better, and the final alignment had about 17.6 mW after the second pass (57% double pass eifficency).  Tuning up the alignment into the cavity we got the trans PD up to 0.94V, but after I transitioned back to science mode the trans power dropped to 0.86V.  

About 1435pst, the BS V2 HEPI Actuator was put back into run mode with a new, no leak, Parker Valve.  I see no jostle on the pressure trends so the other HEPIs are likely very minimally effected.

Valve L071 was replaced by L170.

When I look at the trends I see that the BS position sensor loops have been off quite a bit over the past many days.  Remember the RX & RY will not move to their targets if greater than 500 nrads; so, please check if your alignment seems iffy. 

See the attached, notice that for most of this 30 day plot the trends are very flat, this is the position loops holding location.  Notice though that over about the last ten days, RX & RY spend more time than the other dofs at a different location aand not trending perfectly flat, evidence that the HEPI 'free' position is too far from the target and it won't load the target for those dofs.

Kate G., Mitch R., Filiberto C., & Jeff B.

   Mitch and Jeff installed the HSTS and TCS SRS cables to the in-vacuum feed through and ran them up to the ISI table. Kate and Jeff checked for grounds in the suspension quadro-puss cables which are routed through the suspension Weldment. Filiberto and Jeff checked for grounds on the in-air cables from the satellite box to the OSEMs. There are no grounds in the H1-SR2 cabling at this time.
 
   The top two cables (for the M1 level) are reversed at either the feed through or the Table Cable Bracket. I will check and correct this mis-connection in the morning.       

Rick, Sheila,

at 00:16 the PSL turned off. Rick and Sheila think the power watchdog may have tripped. Sheila has started the recovery procedure.

It is now using the channels in /ligo/lho/data/conlog/h1/target_grep_channel_list.txt (attached). There are 97,345 channels in this file. They are all monitored!