Results of last set of ETMY transfer function after finishing the alignment (see this alog for alignment numbers) are attached below, and look similar to what was taken monday night. TMS team can start (and probably already did) work on the installation. SUS will go in the next days check for lower masses flag/osem centering as well as top mass verticals. 

Attached files :

H1 ETMY fiber after finishing alignment (in black) compared to first alignment (in orange) compared to LLO ETMX fiber in chamber. Main chain (1st pdf) and reaction chain (2nd pdf)

To notice :

- First pitch mode of the main chain fiber quads are shifted down (0.52Hz) compared to the model (0.562Hz). Cf p5 of first attachment.

Jim Rich and Hugh have been working on the ITMX ISI, and found a sign flip. Here are plots of the sus witness sensors (L2WIT) and OpLevs:

• early this morning (brown traces) when we had 750mHz blends on all stage 1 DOFs and could not include any trilliums in the blends without tripping.
• the last half hour or so, (blue traces) with stage 1 blends Tcrappy on all DOFs, stage 2 100mHz on X and Y, 250 Hz on all other DOFs. 

Modified instructions for turning on ITMX ISI after a trip:

• set all blends to 75omHz. 
• make sure T240 WD is disabled by setting the treshold to be large (later you will need to reset this)
• isolate stage 1 level 3
• isolate stage 2 level 3
• change all stage 1 blends to Tcrapy
• change all stage 2 blends to Tcrapy

Of course this mght change, especially the stage 2 blends might work with a different set of blends.

Looked at photo diode forward voltage for ETMY ACB per LIGO-T1100637.
PD forward voltage(≈ 0.5V)

Pin 13 & 12 
PD forward voltage: 0.428V

Pin 10 & 9 
PD forward voltage: 0.421V

Pin 7 & 6
PD forward voltage: 0.428V

Pin 4 & 3
PD forward voltage: 0.421V


Filiberto Clara & Mitchell

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.  

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.