The transfer functions measured between the T240s of stage 1 and the GS13s of stage 2 (ISI-BSC6) are presented in attachment. Transfer functions were measured with the ISI damped and excited by the ground motion. Coherence between the 2 stages in the translation DOFs are really good when the damping filters are engaged. These transfer functions can be used to realise the sensor correction from stage 1 to stage 2 (Translation only). Yesterday, I used the ratio of simulated transfer functions when the ISI is damped for the computation of the match filters.

HAM cleanroom was cleaned twice in preparation for the BSC3 ISI move to the test stand. The test stand also received another wipe down with particular attention to the risers that come in direct contact with the ISI. The ISI was flown to the test stand and the test stand cleanroom moved over the top of it.

HAM4 and the cleanroom around HAM4 got first cleaning today.

25 Days of pumping.

The DAQ was reconfigured to use the new weather stations channel naming scheme. Where possible, the raw minute trend files were renamed such that old data is not lost in the transition. This required several restarts of the DAQ. The new h1ascimc model install also required a DAQ restart due to a changed INI file.

In an effort to correct timing errors on the test stand computers in the LVEA (problem since the power outage early April), I powered off h1oaf0, h1susquadtst, h1susbstst, and h1seitst computers and I/O chassis, then power cycled the timing slave and IRIG-B.  I waited for the the timing slave to sync up and the IRIG-B unit to start displaying the correct time.  Then the I/O chassis were powered on, followed by the computers.  

With the exception of h1susbstst, the models started up with no timing errors.

h1susbstst started with a large IRIG-B time offset, and the models showed timing errors.  I powered the computer down, power cycled the I/O chassis, then powered up the computer again.  The timing remained in error.  I killed the models, then started the IOP model by hand.  The timing was off, and the ADC and DAC indicators were all red.  The IOP ran for several seconds, then the GPS time stopped incrementing.  I powered off the computer and I/O chassis and gave up.  This will take some more troubleshooting.

Also, I moved the IRIB-B feed for the x1dc0 computer on the DAQ test stand to the DTS IRIG-B unit in the H2 Electronics room.  It was being fed from the LVEA IRIG-B unit by a very long cable, left over from the H2 DAQ system.

Attached are plots of dust counts requested from 5 PM May 12 to 5 PM May 13.

This is a late alog from yesterday:

I swapped the links for the internal and external PDs on the fiber distribution box.  As Daniel noticed, they were backwards.  The powers right now are:
from PSL screen ref cav trans PD= 2V (is this calibrated somewhere?)
7.7mW in fiber input to ALS fiber distribution box (the BNC monitor on the front says 0.52V, and the internal PD in beckhoff reads 2.17 V)
0.76mW in sample output
0.58mW in X arm
0.52mW in Y arm
0.446mW in squeezer beam
In the MSR there are 0.4mW, and the end station PDs report 0.170mW total with 22uW in the rejected polarization

The external PD was saturated at 10V in beckhoff when I first looked at it, and the BNC output on the fiber distribution box was 13V.  Then the reading in beckhoff dropped to 4.6V, and the BNC reading dropped to 0.6V.  The lights in the PSL enclosure seem to be on.  

The PDs in this box use the photodiode amplifier D1200543, but the gain is set by hardware switches in the box and not controlled by beckhoff so we are calling them DCPDSimple in beckhoff.  The test report says the gain is set to 30dB, this means the transimpedance is 20000 Ohm.  

The backup file server cdsfs1 has been crashing over the weekend. I performed an fsck on its file system today (no actions were needed) and was able to rsync cdfs0 and h1boot before it crashed again at 5pm. I'll reduce the rate of rsyncs back to daily and look into buying a spare raid controller card.

Aggressive isolation filters were designed on ISI-BSC6. UGFs are:
- 40Hz on all stage 1 DOFs
- 32Hz on all stage 2 DOFs.

The simulink diagram was completed to perform the sensor correction from stage 1 to stage 2. The model was recompiled and installed on h1seiey. Spectra were measured in the following configurations:
- Stage 1 super sensor with T240s blended at 250mHz on all DOFs.
- Stage 2 super sensor with blend at 250mHz on all DOFs.
- Sensor correction on both stages (except on Stage 1 Z)

Calibrated spectra of stage 2 are presented in attachment. Results are good.

The 2 high pass filters used for the sensor correction create a x10 amplification below 100mHz. It is less visible in the Z direction since the sensor correction is only engaged on stage 2.

in SusSVN/sus/trunk/Common/Matlabtools :

• modified save_safe_snap.m  as well as : switch_align, switch_comm, switch_damp, switch_dampin, switch_test, switch_testin, switch_lock, switch_lockin, switch_master.
  They now include a case for OMC and TM suspensions. Moreover, the snapshot created by save_safe_snap.m is now set for damping ON / master switch OFF

• modified prettyOSEMgains.m by including in it logOLs script. the input variables are now {ifo,optic} instead of {data,optic}

in SusSVN/sus/trunk/Common/Matlabtools/SchroederPhaseTools :

• Added LHO_X1_Matlab_TFs.m script copied from LHO_Matlab_TFs.m to avoid svn conflicts between X1 and H1 transfer function measurements

In SusSVN/sus/trunk/QUAD/Common/Matlabtools

• Modified plotquad_spectra.m to automate the process of taking spectra damping on/off

The 3 directories have been commited on the svn

Apollo crew moved BSC Repair Arm, HAM Install Arm, 5-axis Table, and other install tooling to the south side of the beamtube between HAM10-11. 

Christina wiped down the BSC3 ISI storage container and the Apollo crew moved the HAM cleanroom over the beamtube and set it down close to the storage container.

Activities of which I was informed about:

- Hugh at Y-end station, HEPI work.
- Apollo crew, moving items with crane from south bay area to the West north wall area.
- Cheryl, Input viewports cleaning, see her entry.
- Pablo and others inside H2-PSL room, Pcal work.
- Patrick to the LVEA to check on dust monitors.

MitchR, JimW

After several furious hours of helicoiling, forklifting, placing bolts and torquing, the last 2 large plates for the first (formerly-known-as-H2) I1 BSC ISI were added to the assembly today. Next up, everything else: pods, actuators, cps's... Potentially, we could be testing sometime next week.

Restarted dust monitor at location 8 in the LVEA. I found it turned off outside of a small clean room between HAM 2 and HAM 3. Looking at the trends it appears someone turned it off this morning.

I used FC on both input viewports, ALS and PSL.  Both viewports looked significantly better after cleaning - at least a 95% reduction in features.  The remaining 5%  are probably particulate that reattached after I pulled the FC, but could also include stubborn particulate that didn't come off, or features in the optics coating.

This was my first look at the ALS viewport, and it did have a fair amount of particulate on it.  The ALS shutter has removed some anodization inside it's housing.  

My rookie venture into spraying FC meant there was some to clean up around the edge of the optic on both viewports.  Though I was careful, it's possible the solvent I used to clean it up (methanol) could have migrated residue under the flange.  When we have the new shutter, we should consider removing the viewports and doing a more thorough cleaning and inspection in the optics lab.  I have no idea what level of risk, if any, this would be to the optics themselves.

I cleaned what I could reach inside both shutters.

*** I locked the PSL shutter closed *** Filiberto and crew were planning to pull cables about the HAM1/2 enclosure, so this is now laser safe for their work.

	Re 6334, I forgot to turn Corner4 back on after working at Corner3.  The power to the Piers are daisy chained; I just forgot. 

BSC 1 is now added to the list of chambers flushing, with HAMs 2, 3, and BSC 1 now being flushed in the LVEA.  The max pressure we've been able to attain has been about 29 psi, this is with running the pump to max and backing down a little. Air has been caught in the resistors and is being purged on a regular basis. The system works. 

We leveled the optical path from the laser to the first MCL PZT mirror, but things didn't improve much.

The first Faraday transmission is fine (first picture, EOM and the second Faraday removed from the path, picture taken in front of the second lens).

EOM transmission is ugly when the beam passes through the middle of the input and output aperture (second picture).

After fiddling around with the EOM alignment using 4 DOF stage, we always ended up with the beam very high on the input side. (no picture).

After the EOM, when the second Faraday was inserted, it makes many ghost beams /halo  in PIT (third picture). This vertical pattern doesn't change much with alignment.

Using an iris, we can get rid of most of the ghost beams (last picture). The central part of the beam is not totally round, this comes from the EOM. This looks somewhat better than OAT days (sadly).

Anyway, since it is convenient to open up the iris to see the retro reflected beam from ETMY, we left all irises wide open.

The Faraday makes many ghost beams for the refl beam too, but all of these seem to fall on the PD.

We measured the power level right at the laser, downstream of the first Faraday, downstream of the EOM and downstream of the second Faraday. Jax will post the numbers.