8:15-8:35

Fred, Richard, Cyrus, Betsy, Richard, Filiberto, Aaron, Gerardo, Jeff B, Matt, Bubba, Travis, Hugh, Pablo, Mitchell, Justin, Mike, Thomas, Jeff K, Margot, etc.


•	TCS tables work continues. – (Matt, David, Thomas)
•	Contamination Control activities on HAM5 - (Margot/ Jeff B)
•	Getting SR3 ready for installation after reviewing the Hazard Analysis document- Jeff B
•	Continue Scraper Baffle work on HAM4 – (Betsy)
•	ESD work at End Y – Richard
•	Assembly work continues in Staging building – Jim
•	Suspension stages work continues(maintenance) – Jeff K
•	HEPI work (maintenance) - Hugh
•       Cavity baffle work in LVEA test stand - Travis/Mitchell

Crystal chiller refilled (180 ml added).

model restarts logged for Mon 05/May/2014
2014_05_05 00:37 h1fw0
2014_05_05 15:34 h1fw0
2014_05_05 16:30 h1fw0
2014_05_05 16:35 h1fw0
2014_05_05 16:39 h1fw0
2014_05_05 16:58 h1fw0

5 unexpected restarts followed by a reboot.

This morning we plan to shutter the PSL for a bit for TCS work. Richard and I put some of the Guardian managers in a paused state to prevent it from continually trying to relock the IMC. Specifically, we paused IMC, LSC, ALS_YARM, and ALS_XARM.

Stefan, Alexa, Jeff, Arnaud, Sheila

On saturday I took the FDD out of the DIFF PLL loop, this keeps us in the linear range of the sensor whenever both cavities are locked.  Since this means that the VCO gain is reduced by a factor of 10, we added a factor of 10 to the DIFF PLL COntrol signal gain and reduced the PLL input gain by 20dB, it is now 6dB.  The control signal noise is the same with and without the FDD in, as long as the ugf is the same. 

Stefan worked on making the plant inversion at low frequencies the same for the UIM as for the test mass, since the resonances below 2Hz are all common to the two stages.  Arnaud fit the high frequency part of the UIM plant inversion measurement from over the weekend.  

Stefan then adjusted the relative gain between the top mass and UIM by sending an injection to each stage with opposite sign and canceling the signal. 

We began trying to lock DIFF.  We needed to re align the beat note to get -23dBm.  After that the locking went pretty smothly with only the top mass and UIM, we measured the loop gain at a few points and think that our UGF is 0.45Hz.  This suppressed the fluctuations in DIFF to around 0.2um.  We need to engage the feedback to the bottom mass to get more low frequency gain and a higher ugf. 

We repeated the gain balancing for the ESD drive using the top two stages to balance the ESD drive, with a DC offset of 125000.  When we engaged the test mass feedback, the loop rang up at around 0.3Hz. 

Unfortunately h1fw0 could not wait until tuesday maintenance for its solaris server to be rebooted. Its daqd process went very unstable this aternoon so I decided to power cycle the solaris QFS server early to nip this in the bud.

The process is:

1. h1fw0: stop monit
2. h1fw0: stop daqd via telnet
3. h1fw0: umount /ldas-h1-frames
4. h1ldasgw0: # powerdown
5. h1ldagw0: power on via front panel reset button
6. h1ldasgw0: # mount /ldas-h1-frames
7. h1ldasgw0: # shareall
8. h1fw0: # mount /ldas-h1-frames
9. h1fw0: start monit (which in turn starts daqd)

Lets hope this makes h1fw0 stable again. The solaris box did not crash or freeze, so I did not collect any stats. This was a preventive reboot.

LVEA Laser Hazard All Day

900 – FOM video4 found to be hung, Cyrus did some magic and then ops reloaded ST and MC cams

915 – TCS crew energizing laser at TCSX and continuing table buildup at TCSY

930 – Jeff B/AndresR installation prep at HAM4/5

1009 – Richard was in the control room when ETMy happened to trip

1030 - Betsy/Travis to EY on looking for parts

1030 - Justin/Sheila updated SUS_CUST_QUAD_OVERVIEW.adl to show the correct labelling for the lock filters

            on L1 and L2

1053 – Apollo finished installing HAM arm at HAM5

1110 – Kyle to EY to look at vacuum rack

1147 – Fil to EY to work on ESD cabling

1300 – Confirmed with Sebastian that guardian manager deliberately paused for BS-ISI

1309 – Betsy/Travis to west bay LVEA

1436 – Corey taking tour to LVEA

I was looking over the PSL this morning and I noticed that in addition to the changes mentioned in Rick's aLOG from last week there was a sharp increase in the diffracted power in the ISS. From 10% to 41% diffracted power. Could this have something to do with the decrease in the transmitted (and sum) light for the PMC? The power decrease in the transmitted light from the PMC and the increase in diffracted light are both around 30%.

Travis, Betsy

Today, we finished rounding up the last few items in preparation to install the 4 baffles on HAM4 (Mitchell had a chunk of the hardware staged).  We also reassembled the SR2 Scraper Baffle which had been contaminated and re-cleaned a month+ ago.  It and everything we need is staged near HAM4.

IP11 was displayed as "RED" on CDS screens -> Found II422A +/- signal wires reversed on terminal strip -> corrected and "OK" or "GREEN" now indicated on CDS screens 

Final alignment numbers for last weeks SR2 alignment (now that we have good TFs):

• X axis position: -595.4 mm
  • Target: -594.2 mm
  • Error: -1.2 mm
  • Tolerance: ±5.1 mm
• Y axis position: -4161.1 mm
  • Target: -4161.5 mm
  • Error: +0.4 mm
  • Tolerance: ±3.0 mm
• Z axis position: -104.3 mm
  • Target: -104.7 mm
  • Error: +0.4 mm
  • Tolerance: ±3.4 mm
• Pitch: 5 µrad up
  • Target: 0 µrad
  • Error: 5 µrad up
  • Tolerance: ±520 µrad
• Yaw: 42.289 mrad CCW
  • Target: 42.169 mrad CCW
  • Error: 0.120 mrad CCW
  • Tolerance: ±0.820 mrad

Sheila, Arnaud, Stefan

Based on the model (both the sophisticated official, as well as a simple 4-mass, length only one) the transfer function ratio
(TOP_L-to-TST_L)/(UIM_L-to-TST_L) is given by a simple pendulum resonance, namely the resonance of the top mass, assuming ass other masses are locked down (divided by the spring constant strength between TOP and UIM).

Since we had a very good measurement of the TOP_L-to-TST_L transfer function below 1Hz, we trusted those poles and zeros, and simply updated the UIM inverse plant filter with the corresponding <1Hz poles and zeros of the TOP inverse plant.

Next I copied the top mass blendLP to the UIM LOCK bank, and added a gain of -1. this allowed my to drive the nominally same signal through TOP and UIM, with opposite sign. Then I fine-tweaked the relative gain (and additional factor of 1.255 for the UIM drive), getting a drive signal cancellation of -39dB at 0.31Hz. THe same gain setting still gave me a cancellation of -26dB at 0.91Hz.

I now trust the TOP/UIM blended actuator - onwards to the ESD!

Attached are snap shots for the LOCK filter banks. (The UIM - the one with the gain of 1.255 - has the wrong title - the MEDM needs to be updated.)

Sheila noticed that some of the labels for the ISC lock filters linked to SUS_CUST_QUAD_OVERVIEW for ETMy/ETMx were incorrect. Specifically, L1 and L2 were both labelled as M0. We replaced with the correct title and committed to svn.

We also verified these errors were not present for the HSTS/HLTS/BS medms.

After the alignment of SR2 on friday, a set of transfer functions of the top mass has been ran over the week end. Measurements are agreeing with the model.
Only things to note : First pitch mode is slightly shifted down (from 1.00Hz to 0.96Hz), and second roll mode is slightly shifted up (from 2.19Hz to 2.27Hz).
The osem open light values and serial numbers for the osems of this suspension can be found under the excel spreadsheet E1200343.

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

Green team (XY-arm):

• ALS DIFF locking.
• Hand-off ALS signals to interferometer signals.
• Noise hunting.
• Make a measurement of input HAM/IMC motion using POP and the red reference beam.

Blue team (Y-arm):

• Finish WFS cabling.

Blue team (X-arm):

• Revisit the WFS with the now improved beam quality.

Red team:

• Reestablish PRMI.
• Center the red QPDs in EX/EY.

SEI/SUS team:

• Setup alignment dither.
• Commission EY ESD drive.
• Commission high bandwidth length drive to SUS/ESD.

J. Kissel

We're most of the way through turning H1 SUS ETMX into a super actuator of TOP, UIM, and TST actuation stages, so I've installed an over all controller into FM1 of the LSC_DARM filter bank in the H1LSC.txt filter file, called simply "ALSDIFF" (this replaced a "p0.01" integrator). The filter design string is 
zpk([5;5],[0.5;80;80],1,"n")
i.e. two real zeros at 5 [Hz], balanced with two poles at 80 [Hz] to provide a phase boost around 15-20 [Hz], and a boost pole at 0.5 [Hz],
which was the controller used for a design with a 15 [Hz] UGF (see plots from LHO aLOG 11676). Noteably, the DC gain of the filter is unity. We haven't yet installed any of the overall gains, so those will need to be installed and tuned before we *actually* get a UGF of 15 [Hz]. Remember, the design uses both ETMs, and over-estimates the TST drive strength by a factor of 4. But, as long as we install the *measured* gain ratios (again, see LHO aLOG 11676), and are consistent with our overall super-actuator gain, we should be alright.

At this point, our plan is to have what is sent to the suspensions be in units of [um] of desired DARM correction, and we'll have the overall gain of the super actuator be [ct_{TST} / um_{DARMCTRL}], or DAC counts of test mass motion per micron. From LHO aLOG 11676, 
TST: 1.760e-13  [m / ct_{TST}]
     = 1.76e-7 [um / ct_{TST}]
   ==> 5.68e+6 [ct_{TST} / um]

model restarts logged for Sun 04/May/2014
2014_05_04 17:02 h1fw0

unexpected restart of h1fw0

LVEA going to laser Hazard as soon as possible

SR2 alignment mostly done...some TF's from Arnaud ongoing

HAM Arm install @HAM5, may involve cranining and forking (Bubba)

TCS - alignment on TCSX, req laser hazard...prep for in vacuum alignment Tuesday

Integration---working on ESD drivers

Richard - inspection of EY ESD

Have noticed odd behavior with the HAM4 Dust Monitor (listed as #1).  Have gotten MAJOR alarms for 0.3um particles (several hundred up to a few thousand counts!).  Conversely, 0.5um particles has been virtually 0 for days.  Mentioned high counts to Betsy before she went out to HAM4 today, and she mentioned that she only saw small counts out there on the floor.  So there seems to be a discrepency some where. 

Attached is a trend of the last 5-days.  Will send an email to Jeff B.