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

There's a huge 0.038Hz oscillation in ITMX OL laser intensity.

It's not compromising the OL PIT and YAW performance much if at all, but needs to be fixed at some point anyway.

Per WP #4422, Filiberto and Aaron have arrived at EX (11:00 AM local) to install the Trillium seismometer.  Patrick is there also investigating the dust monitor.

This morning I can see that the drip is forming at the Valve Cover and not at the Valve/Manifold seal.  The valve may still be working fine but it should be changed out and repaired.  This could be delayed if the glitches and being offline for a few hours tomorrow is untolerable but I'd prefer to get it done sooner rather than later.

Here is the list of commissioning task for the next 7-14 days:

Green team:

1. Implement optical lever feedback damping to address the mode hopping problem.
2. ETM drive diagonalization
3. Commission the red cavity lokcing signals.
4. Lock the arm cavity on red.
5. Make a mode scan of the red resonances
6. Commission the common mode hand-off including the AO path.
7. Measure difference between red and green locking offsets.
8. Commission the length feedback path to the ETM top suspension point to suppress microseism.
9. Asses the status of the reference cavity temperature controls.

Red team:

1. Mode matching measurements using ISCT1 and maybe IOT2R.
2. Mode cleaner characterization: Absorption, heating and scattering.
3. Optimize the thermal compensation of ITMY.
4. Calibrate SPOB 18.
5. Meausre the PRC length
6. Lock the PRMI using the 3f signals.
7. Investigate the REFLAIR45 whitening filter issue.

TMS:

1. Repair and exchange the in-vacuum cable for the beam diverter.

ISCTEY:

1. Complete the feedthrough panels.
2. Install the on table cabling.
3. Prepare for move to the end station.
4. Check out ALS electronics in EY.

SEI/SUS team:

1. CPS master clock and associated noise.
2. Improve performance.

(Alexa, Daniel, Stefan)

The RD rotation was adjusted to 120deg. This was determined such that the sideband signal was seen in only I, with nothing appearing in Q.

Note: the RF9 frequency is set to 9099471Hz  (only 300Hz from the FSR). We still see RF AM.

Bubba reports that the installation arm is now attached at HAM4.  Jeff B is preparing to install SR2.  They hope to have the optic inside HAM4 by lunchtime.

If anyone was looking at data from PRMI overnight, I just realigned the etm, causing it to drop lock. 

The MC2 roll mode notch (FM6 in ISCINF) was left off overnight, resulting in a rung up 28Hz peak in MC_L, which was producing a huge signal in PRCL. Once on the peak slowly disapeard.

PRMI locking is now quite reliable. However we still have relatively big power fluctuations.

I recorded today's settings in a setup script: sballmer/tempfixes/setPRMI
Really, this should be fed to a guardian.

In an effort to help the ISC crew use the seismic platforms I looked at ITMY performance today with the various blends and levels.  That is still ongoing though.  Meanwhile, since Stefan is able to lock his PRMI with the ISIs off, I propose that the ISI position loops do not do enough positioning to matter (HEPI is another story.)  So in an effort to make the ISI turn on more 'one button', with the ISI off I loaded the current positions in to the position loop targets.  With the position loops not doing much then, the Isolation can be turned on with the one button.  That isn't to say the ISI won't drift somewhere again too far, but for the moment at least it is 'one button.'  You can look at the first plot of trends to see what changed.  Most changes are very small but RZ is maybe 2urads.  Maybe significant but again, if the alignment is OK with the position loops off, these should be just fine.

So I brought the ISI up to Hugo's configuration of 6 Dec.  Not that it can't be improved or that there are no problems but at least the BLRMS looks pretty good, I think a lot better than turned off.  This configuration is 250mHz blends on Stage2 with T250 blends on stage1 except X & Y with T100mHz.44NO.  This is with level3 controller.  The script actually engages the boost2 rather than boost3 (heard that before haven't ya) but I really didn't see a difference at higher blends when I switched it to boost3 so I don't think it matters.

Again, we certainly need to improve these ISI performance, another day.

 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

I measured the noise floopr of the HAM-6 CPS. This is in the configuration that seemed best at LLO, a ground from the electronics rack and a local ground.

The gold colored line is twice our noise model which is what we were getting at LLO.  I have been using two different targets which are at +/-4Volts and since the noise goes as the square of the

distance we would expect the noise from the channels using the different targets to be  (1+0.4)^2 and (1 -0.4)^2  (there is a 1mm offest) which is more or less what we are seeing at high frequencies. 

At low frequencies (were we use then in the control) it is clearly steepper then the noise model

 there is also a noise spike at 0.5Hz in H2 and V2, I chased this a bit last night and found

  - It doesn't look like it is coming from the CPS electronics, I turned of the power to the CPS (unplugging the calbe in the electronics room) and it was still there

 - when I shorted out the inputs to the HAM SEI interface on channels #1 and 2 it popped up in channel H3 and V3 

 - as far as I can tell it has always been at exactly 0.5Hz

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.

We found that the pitch and yaw outputs for the y-arm initial alignment were flipped. Fixed the model and recompiled.

h1asc.mdl: SVN revision 7011.