In the top panel of the attached, red is the ETMX OL PIT, pink is the dark noise (this is ETMX OL PIT when there's no light on the OL, but a fake offset of 9900 counts was applied to OL SUM so the scaling of red and pink become the same).

The RMS of the red line for f>0.1Hz is about 0.15urad (that's about 0.5 urad pk-pk). The dominant hump at 0.4-0.5Hz is about 0.12urad RMS, but it seems like the microseism is adding another 0.9urad RMS, resulting in sqrt(0.09^2+0.12^2)=0.15urad RMS.

Dark noise is well below the PIT signal up to a few Hz.

Green is the OL SUM normalized by OL SUM DC, and then scaled by H1:SUS-ETMX_L3_OPLEV_PIT_GAIN. If  the green stays on top of the red for some frequency band you'd be suspicious that the OL quadrants are measuring some noise that is incoherent across the quadrants (shot, dark), but that's not the case.

So OL seems to be measuring the angle at least for f<1Hz, probably we don't have to worry too much about injecting more noise than we want by using OL damping. Even if the actual PIT noise floor is as big as green (which is not likely), the RMS due to noise injection is not bigger than brown dashed curve.

OTOH, at least for the time when the measurement was done, it seems like the damping for 0.4-0.5Hz hump is not good enough, microseismic should be attacked too.

Commissioners remain in the control room.  Earlier, Richard went to EX to investigate the dust monitor that Patrick reported below.  The DM's behavior remains unresolved.

Doug and Jason are out of EY, leaving the station in laser hazard.

With uncontrolled position/controlled target differences of 10 & 13urads in Rx & Ry, the turn on of HEPI rings up the trilliums and makes ISI turn on (especially when HEPI trips) not one button.  Are these tilts really needed?

Andres, Scott, & Jeff

   The H1-SR2 suspension has been installed in HAM4. No significant issues or problems were encountered during the installation. 

   A big thank you to the Apollo crew for all their support with the prep work and the installation. 

(Alexa, Sheila, Stefan, Evan)

Using the picomotors, we have centered the beam onto both POP A and POP B QPD. For reference... with a whitening gain of 45dB, H1:ASC-POP_A_SUM_OUTMON = 11450 cnts, H1:ASC-POP_B_SUM_OUTMON = 10436 cnts.

We have also calculated how many counts we expect on each quadrant: We have 8.8W into MC. There is 15% loss due to input optics losses (IMC and faraday), 3% transmission of PRM and 230ppm from PR2. This gives about 6.4uW for each quadrant of the QPD. With a responsivity of .8 A/W, a transimpedance of 1kOhm and a gain of 45dB, there is 1V on each quadrant. This amounts to about 3000 counts on each quadrant, which is consistent with what we see.  

As a prep for the PRC length measurements, I hooked up a DAC cable of LSC, CAB_H1_ISC_421, to the Dsub breakout board D1201450 at the 18th floor of the ISC rack R4 as specified in E1200408-v14. It is connected to the right half of the breakout unit.

Then I connected a TNC cable from the 2nd output port of the breakout board to the A excitation of the IMC servo board. This is a temporary configuration and allows us to remotely excite the IMC length using the LSC_EXTRA_AO_2 signal (see T1100242-v11 for the signal assignment).

Jeff and Andres report that SR2 now sits inside HAM4.  The installation arm remains on the chamber and will come off Tuesday morning.

I noticed last week that the IPC receive errors at all end station SUS and HEPI for the LSC signals is non-zero. Following the discovery of LLO LSC transmit errors to the end stations due to CPU overrun on the LSC model, I verified that our errors are also due to the LSC model running longer than its average of 40uS. The attached plot shows the error going to ONE at the time the LSC cpu increased to 44uS. The error latches, which is why we don't see any indication of the subsequent 45 and 44uS excursion.
I am running a script which clears the diagnostics on H1SUS-ETMX every minute. The next time an IPC error is seen it will reset after a minute ready for the next event.
All the error rates I've seen so far are only for ONE transmission of the 16384 sent that second. So the error rate is about 3 in an hour or 5.e-6 %

Currently underway (~1:30PM local):

** Doug is transitioning EY to laser hazard for IAS.  Betsy and Travis have been at EY this morning and might return this afternoon depending on Doug's results.
** Rich continues to test BS ISI.  He's pausing while Filiberto attends to a CPS cable at BSC2.
** A semi from LLO carrying storage containers, etc. has driven down the X arm.

This morning I finished rolling out available guardian updates for suspension (following alog 9733)

• Created and started a guardian process for : MC1 MC3 PR2 BS ITMY ITMX ETMX ETMY TMSX TMSY using the commands :

guardctrl create SUS_MC1

guardctrl start SUS_MC1

• Saved the alignment offsets to their current values (except PRM which is in parking position), in order to test if the align_save_burt python script is properly saving, and the guardian properly restoring those offsets.
• Table below summarizes those offsets :

• Modified the overview screens quad/hsts/hlts/tmts/bsfm to make the link to the guardian work

changed the command of the guardian button from  /ligo/apps/ubuntu12/guardian/bin/guardmedm to -> guardmedm

• What still needs to be improved / fixed :

- The sitemap needs to be started from a terminal in order to either save the offsets, or open a guardian medm screen.

- Managing the way the offsets are saved. For now there is 4 txt files per suspension under /opt/rtcds/userapps/release/sus/h1/burtfiles.

one .req file defining the two offset epics channels, one snap file for the aligned value, one snap file for the misaligned value, one file saving all the aligned offsets with the date it was changed.

Installed Trillium Interface Chassis S1101837 in Rack SEI-C1 (slot U18).
Trillium was placed close to southwest side of BSC9.
Outputs from Trillium were connected to AA Chassis U30, CH21-26 (Port 5).
Trillium may need to be zero-ed.

Filiberto Clara

Seismometer installation completed at 12:06.  Patrick had earlier returned from EX.

Seismometer installation completed at 12:06.  Patrick had earlier returned from EX.

The dust monitor at end X has stopped communicating. From trending back it appears to have stopped sometime around Jan. 31 2014 17:46 - 17:55 UTC (9:46 - 9:55 PST).

It is odd. The dust monitor itself acts as though it is receiving commands (the front panel goes into remote mode), but the software times out waiting for a response. I checked the front panel settings, the cabling, turned the dust monitor on and off, restarted the IOC and power cycled the Serial to Ethernet converter, all to no avail.

Rich will begin evaluating the low frequency performance of the beam splitter ISI.  

Rich M, Richard, Dave

Between the times 11:11 and 11:22 local I power cycled the h1seih16 front end and IO Chassis as part of the investigation of the intermittent 0.5Hz noise on HAM6 ISI CPS.
The procedure followed was:
in MSR
  Kill all user models and then the IOP model
  remove unit from Dolphin fabric
  power off the CPU from the console
in CER
  power down h1seih16 IO Chassis using front panel switch
  remove 24V power cord for about 15 seconds
  reapply 24V power cord
  power up IO Chassis using front panel switch, verify timing slave start correctly
in MSR
  power up h1seih16 CPU, verify no error on console

 Spent some time looking at the noise of the CPS on the BSC after rerouting the sync signals

  One figure is a matlab plot of some calibrated signals using a fixed target on which there are some VERY bad BS channels

  the second plot is a dtt screen of all of the BSC CPS channels in counts, (BS-V3 is looking at a fixed target, all other channels are looking at motion) with all of the ISIs OFF.

  there are a number of icky channels

Stefan, Kiwamu

The PRMI lock is now quite solid. After we engaged a dither alignment system for ITMY, we turned on the ring heater on ITMY with a hope it is going to improve the mode matching.

• We set the modulation frequency back to 9099471 Hz which is the nominal value. This was for making sure that the separation of MICH and PRCL is good in REFLAIR_RF45. Although, we didn't do any quantitative assessment. So we have to revisit this.
• Both stages of BS-ISI and stage2 of ITMY-ISI were turned off because they were found to be too loud at low frequencies around 0.5 Hz and also at around 10 Hz (for some reason). Disabling them made the PRY noise quitter and the length RMS improved by a factor of 2 or 3.
• We successfully locked the PRMI with the sideband resonant with the settings shown in the attached screenshot.
• We found four oscillations very close to each other at around 300 Hz which are believed to be the BS wire violin modes. Two of them were so big and 6 orders of magnitude bigger than the noise floor.
• We put a double notch filter in LSC-MICH and PRCL filter banks. This let the mode ring down slowly.
• Also, at the same time we saw a power drop over a time scale of 2 minutes which seemed to be correlated to with the peak height of the violin modes. This behavior went away after the notch filters were installed.
• The PRMI lock was so stable that it did not spontaneously unlock.
• We set up an audio output path in LSC-DARM and used Chris's cool script, rockifo to listen to the sound of PRCL and MICH.
  • It is available in /ligo/home/christopher.wipf/Public/bin
  • For example, rockifo H1:LSC-DARM_OUT_DQ 16384 100
• We imported LLO's dither alignment stuff, but we realized that it only dithered the common mode of the power recycling cavity while we wanted to stabilize the ITMY angle drift. So we decided not to use it.
• We temporarily disconnected the cable for the ITMY green transmitted power and instead plugged in QMON of POPAIR_B_RF18. We used an SR560, AC coupled at 0.1 Hz with a gain of 5000 to whiten the signal.
• We then used the Y-arm dither alignment system to keep ITMY well aligned. We chose 1.7 and 2.4 Hz for pitch and yaw excitations respectively.
• We could close both pitch and yaw loop, probably with a UGF of 0.1 Hz for both.
• We turned on the ring heater at around 00:08 in local time with 10 W in both upper and bottom heaters of ITMY.