Last Tuesday I measured the ALS beam profile by the ITMY baffle PDs.

This was before we replaced the ALS Faraday today.

I tilted the beam by the PIT and YAW offset sliders of the TMS table. Then I used Keita's calibration of the sliders from counts to radians (see aLOG entry 3244) to estimate the actual beam tilt.

I swept the beam over the ITMY PD2 baffle PD. The beam was centered on this PD when the offsets were:

PIT -79500, YAW +49041

Initial values were:

PIT -60691, YAW +56641

Sampling a Gaussian beam in X or Y with a PD of finite radius r0, produces and intensity profile defined by the function attached below: xc is the beam center location, and w the beam radius.

I measured the beam radius by fitting the data from the PD scan with this function. Assuming that the ITMY baffle PDs are Perkin Elmer YAG-444AH (although a document by Mike Smith says that they're YAG-444-4AH QPD), then r0=16.3/2mm and the resulting radii are:

Vertical diameter: 59.4 mm

Horizontal diameter: 45.6 mm

The beam is astigmatic and not well matched to the cavity mode.

We are going to improve the mode matching soon.

We replaced the green Faraday due to clipping problem.

We've already aligned the injection path (i.e. the beam goes to the TMS and the QPDs are centered) but we need to work on the PDH and WFS path tomorrow.

Turns out that segment 1 and 2 of the legacy WFS DC interface for WFS1 are not working. When we injected some offset using a break out board, these segments didn't show anything in the output. It's not the WFS head, it's the interface.

Pulled the board to investigate in the lab.

Attached are plots of dust counts > .5 microns in particles per cubic foot. Also included are plots of the modes for a particle counter in the optics labs, LVEA and end Y. The plot of the mode of the dust monitor in the optics lab (H0:PEM-LAB_DST1_MODE) shows approximately when the communication was lost and restored for the three dust monitors in optics lab, vacuum prep, and bake oven room.

The following is an update to the status of the H2 SUS ETMy L2 stage (PUM) actuation. The L2 stage has not been completely vetted with clean transfer function measurements and good coherence seen in all of the OSEMs.  The drive amplitudes needed for these measurements are approaching the DAC limit of ~131,000cts for individual OSEMs coils.  Note that this value is much higher than the actuation watchdog limit set in the SUS QUAD User model, which was initially set at 15,000cts.  The limits were increased to allow these large excitations to pass.  

The first plot is a whitenoise transfer function measurement taken on 07/02/2012 in the Longitudinal DoF on ETMy L2.   There is great coherence above 3.5Hz for one of the OSEMs (the "LR" OSEM), however, the drive is sent equally to each OSEM.  The remaining OSEMs have some coherence, but is much lower than expected for a healthy OSEM response. The DC coherence is essentially zero for all OSEM responses.  The WhiteNoise amplitude for this measurement was ~300,000cts in the "*_TEST_L_EXC" channel, corresponding to roughly a 75,000ct amplitude per OSEM coil.  The reason why one OSEM has such a high coherence is still an ongoing investigation.  Possible measurements would be to measure the impedance of the Coil Driver box or the Satellite amplifier for each of the OSEM drive signals. For the transfer function plot itself, the resonances are somewhat visible but not sharp enough to be distinguished.  

The second plot is the same measurement taken back on 06/04/2012 but with a lower excitation amplitude of 90,000cts in the "*_TEST_L_EXC" channel. There is great coherence above 6Hz for one of the OSEMs (the "LR" OSEM).  The remaining OSEMs have some coherence, but is still not quite as good enough for a clean transfer function measurement.  For the DC coherence, each of the four OSEMs do respond in equal magnitude with the "UR" OSEM having a slightly lower DC response.  The same can be seen in the transfer function at DC, where the "UR" OSEM has a slightly lower DC response.  Resonances are still not clearly visible as well.

Activities: July 5, 2012

- Dave B. 
	- restarted models:
	"I have just restarted the H1 SUS models for PR2 and SR2 on h1sush34 to
	complete this system. I pressed the DIAG RESET button to clear the latched
	IPC error, so everything should be green on the medm screens."
	Dave

	- later, a frame builder restart on H1 

- Dust monitors went invalid, Patrick restarted, alarm handler did not update, I had to reopen the alarm handler and truly false alarm states cleared, however a couple false false alarms remained (see note below)

- Matt H. in LVEA working on triple and in CR working on making transfer functions, but instead uncovering issues with files and channels for H1.  Dave B. is looking into it.

- EY visited by numerous people: Keita, Alberto, Mike L. - OAT related

- EX visited by numerous people:
	- Terry S., Terisha,  others(?), for cleaning
	- Apollo for building a clean room

- Kyle, changed out some GN2 pressure gauges

---------
Alarms that really aren't….
- LVEA dust monitors DST7 and DST12 - false alarm when invalid

Attached are plots of dust counts > .5 microns in particles per cubic foot.

Though Beckhoff model was generated for the WFS DC signals, it wasn't reading anything at all.

We eventually found that the Legacy PD concentrator that routes WFS DC and PDH DC signal to Beckhoff chassis (https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=61861) had a manufacturing error: DB37 male and female connectors are mixed up.

DB37 female should be used for the output end that is connected to Beckhoff input, but DB37 male was used instead.

Likewise, DB37 male should be used for the input end that is connected to the output of the legacy LSC diode interface, but DB37 female was used instead.

Due to this, apparently the Beckhoff cable and the legacy LSC diode cable were swapped as it's impossible to connect things up correctly.

We used two 37pin gender changers (one male-female, one female-male) to "fix" this problem. After this, it seems that the EPICS screen for WFS DC is displaying something sensible.

[Joe B, Matt H]

1) Make sure you have the matlab simulink .mdl model ready in userapps.
2) ssh into the build machine "ssh controls@h1build"
3) cd /opt/rtcds/lho/h1/rtbuild-2.5/
4) make model name (i.e. make l1susmc2)
5) make install-model (i.e. make install-l1susmc2)
6) If possible, create a safe.snap file before hand in /opt/rtcds/lho/h1/target/MODELNAME/MODELNAMEepics/burt/
6a)Copy a safe.snap from LLO (say l1susmc2_safe.snap, renamed properly) and run 
    sed -i 's/L1:/H1:/g' safe.snap
6b)Otherwise use the burtgooey command to make a backup *after* the model is running, using the autoBurt.req file in /opt/rtcds/lho/h1/target/MODELNAME/MODELNAMEepics/ directory, create a safe.snap.
6c)Another way is to use makeSafeBackup script in /opt/rtcds/userapps/trunk/cds/common/scripts/ and hand it susbsystem (i.e. sus) and model name (i.e. h2susmc2)
    ./makeSafeBackup sus l1susmc2
   Only works as controls, so be logged into h1build or a front end, and only after the model is up and running, and set to the right values.
7) ssh into the front end the code will be running on (h1sush34)
8) lsmod (tells you whats currently running)
9) If you need to load a new IOP model, kill any currently running models
10)Run the "startMODELNAME" script (i.e. starth1iopsush34 or starth1susmc2).  IOPs always need to be running before user models.
11) Quick filter loading has two options:

11a) Open your empty foton filter file in foton, and uncheck Read Only (under the file menu), and hit save.  This preps the file to receive filters.
Then run the prepare.m script from /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/ in matlab.
prepare('H1','SUS','MC2','HSTS')

11b) Copy the foton filter file from LLO and rename it to H1.  I.e. copy L1SUSMC2.txt from LLO and rename it H1SUSMC2.txt and put it in /opt/rtcds/lho/h1/chans/

12) Hit the "Coeff Load" button on the GDS_TP screen associated with your model.

I installed a new h2peml0 model for the corner station and restarted the H2 DAQ

The HAM6 ISI has been under purge for several weeks now and we've seen a continuous drop in dew point. These latest data are a continuation from previous logs. 

You can see on the 24th the numbers spike. This was caused by me allowing (unintentionally) the Nitrogen dewar to run out over the weekend. Luckily after refilling and restarting the test on the 25th you can see the dew point dropped quickly enough. Most likely this was air intermixing at the probe and less mixing inside the shipping container. I've decided to continue to run the purge at 10 liters/min until the numbers stagnate for a long period of time.

Last Friday, I replaced Chassis Power Regulator board D060279 with D1000217 on the following AA/AI Chassis.
 
S1102693
S1102694
S1202505
S1202506
S1102693
S1000250

This was to address overheating/over stressing of components on old power board.
The units are located in the SEI and SUS Test Stands in the staging building. 

Filiberto Clara

I removed the final Horiz & Vert Actuators from BSC4's SW corner.   All of these Actuators are on pallets out near BSC3, for installation on H1 HEPI locations.  The crane is parked in its normal parking spot.

It turns out that most of the power in the HWS path is just dumped. We installed a PDA55 to monitor this otherwise wasted beam so that we can measure the reflected beam power without being clipped.

According to this PD our contrast (1-min(locked)/unlocked) is 65%. I'm taking min(locked) because, when locked, the REFL power fluctuates much because of the alignment fluctuation (but not clipping). 

We can refine alignment further, but doing it manually is no fun. We're working on WFS. Also, though there's no fast ADC monitoring the refl DC, we might be able to auto-dither connecting REFL DC to AUX channels.

Attached are plots of dust counts > .5 microns in particles per cubic foot. I have also included plots of the modes for a dust monitor in the optics labs, LVEA and end Y. The connection to the dust monitors in the optics labs was lost. The IOC was restarted in the evening.

Mitch, Corey, Hugo,

Quick TFs were taken in the morning. They shown 1/2 gains on L4C-V1 and GS13-V2. The other main issue was the presence of a high-Q resonnance at 237Hz, on the Actuator-H1--to--GS13-H1 TF.

• The 1/2 gains were quickly corrected by adjusting the electrical connections on X1-SEI electronics rack, and on the in-air cable extensions. These connections probably got loose when work was performed on the rack, last Friday.  
   
• The resonnance seen at 237Hz on Actuator-H1--to--GS13-H1 TF is something we were chasing for about a week now. We first suspected that the stack of big masses set on top of the optical table, to payload the ISI, were somehow resonating (as we saw it in the past). We tried different configurations for those top masses, without much success (see SEI log #59). 
  Further inspection revealed un-torqued bolts on the outter walls between corner 2 and 3. Having them torqued improved the TFs in terms of HF noise, but did not remove the unwanted high-Q resonance. 
  Today's investigation revealed untorqued bolts at the base of GS13-H1. The quick transfer funcions taken after torquing those bolts, showed that the unwanted resonance was gone. The boundary conditions at the pod's base are now constraining enough to prevent it from moving independently from the ISI.

Transfer Functions measurements are running overnight.

~9:30AM - craning work begins in the LVEA for ISI HEPI
~10:43AM - craning work completed
 
Work beginning in the morning at End-Y for OAT cavity locking lasted until the late afternoon.