Jim, Mitchell & Hugh

Jim went in chamber to assist Betsy with Baffle hanging while Mitchell & I did the final dressing of the sensor cables.  We followed protocol (T1200193) to insure consistent grounding of the GS13 seismometers.  The sensor cables where then checked with the emulator to confirm good & right cables.  All checked out and then were plugged in.  All sensors now functional.

Next we checked the zeros on the HEPI Load Cells, all below 20lbs.  Continued then with HEPI loading after the horizontal locks were pulled back.  All corners now floating.  We are ready to level and elevate the ISI Optical Table in prep for IAS.

This morning, I hopping into the chamber and plugged in our 3 SUS 25 pin feedthru connections.  Richard turned power on to enable sus controls.  Arnaud fixed some model errors.  The BS is not suspended yet as some coarse SEI balancing and alignment is up next.

Then, Jim and I hung the 2 Elliptical Baffles from the suspension downtubes mounted on Stage 0.  The cartridge is fully payloaded now.

   After updating incorrect matrix values in MEDM, we reran the TFs on I1-MC3. The results look much better. There are several small non-modeled peeks near or below 0Hz in the L, R, and Y DoFs and some noise in T just below 0Hz in the undamped plots. These are mostly removed from the damped plots. The comparison plots show all these non-modeled peeks are in line with similar non-modeled peek present in other suspensions. Waiting for Testing Group to review data before making any changed to I1-MC3.   

(Sheila, Max, Chris)

On Friday we uncovered a snafu with the slow controls cabling at the Y end.  The connector labels engraved on the rear panel of the "End 2" EtherCAT chassis (Exhibit A) do not agree with the chassis wiring plan (Exhibit B).  Upon opening the chassis it appeared that the internal wiring to the Beckhoff modules was done according to (B), whereas the external cable runs had been connected relying on (A).  Here's a table showing the correspondences:

Port
Wiring plan
Rear panel description
6
Auxiliary
DC Photodiodes
7
PZT Mirrors/PDs/Laser Temp
Auxiliary
8
TCS
PZT Mirrors/PDs/Laser Temp
9
RF Amplifiers
TCS
10
DC Photodiodes
RF Amplifiers
11
LSC Demodulators
LSC Demodulators
12
Laser Diagnostics
Laser Diagnostics

This problem came to our attention after we noticed that the fiber PLL slow path (laser temperature) control output was broken.  Actually it was just routed onto the wrong cable.

Attached images show the interior and rear panel of the End 2 chassis at the Y end.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM March 20 to 5 PM March 21. Also attached are plots of the modes to show when they were running/acquiring data.

Data was taken from h1nds1.
T0=13-03-21-00-00-00; Length=86400 (s)
1440.0 minutes of trend displayed

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM March 21 to 5 PM March 22. Also attached are plots of the modes to show when they were running/acquiring data.

Data was taken from h1nds1.
T0=13-03-22-00-00-00; Length=86400 (s)
1440.0 minutes of trend displayed

All the ISI cabling has been dressed and run to the feed-thrus.  They are connected to the feedthrus; some but not all are disconnected from the sensors.  The racks are currently off.  We will perform emulation check outs before the sensors are wired and powered.  This should go quickly.  The baffles are not hung but can be now.

Please do not power on the BSC2 ISI seismometer racks.  The CPS are on but all others are off and should remain so.  A few images below for the ages.

Day's Activities:

Baffle crew finished up their week's work in their cleanroom

Betsy heading into BSC2

PCal peeps working in H2PSL Anteroom in afternoon (Pablo, Gregario, & Craig)

Arnaud running quick measurement on ETMy at ~11:00am

rebooting model for SUS BS (Barton)

HAM2 work in afternoon (Betsy)

EY ISC work (Sheila)

SEI crew is working in and around BSC2 (Hugh, Jim, Mitch)

Alarms:

RO Alarm this morning ('Ski notified)

DUST: 

• Optics Lab Dust INVALID alarm
• HAM2 Cleanroom Dust alarm--this one has been alarming all day (with MAJOR alarm set at 200 counts, but every time I looked out there, no one was working out there.)  So, I changed the alarm setting.
• H2 PSL Enclosure MINOR alarm, most likely due to Pcal dudes.

Dust Monitor #8 = HAM2 Cleanroom (as of 3/18/13)

During my two shifts this week, I noticed this dust alarm having MAJOR alarms throughout the day, and most of the time, I'd check and see no one inside or near the cleanroom.   Generally the alarm would only last one cycle (~1min) & then clear.

The MAJOR setting was set at 200counts for 0.3um & 0.5um.  I increased it to 300counts & we'll see how it goes.  (this was done by changing values on the Alarm Settings medm window for Dust Alarm #8)

(at the moment, we have Travis & Betsy in the cleanroom working inside of HAM2 and the counts are 0.)

Mark B. Arnaud P

After Betsy realized the range of the ALIGNMENT OFFSET slider was much greater than the real actuation range (see alog entry 5852), we decided to change the max and min values of the slider for all the suspensions. For now only HSTS and HLTS medm screens have been modified. BSFM and ETM/ITM will be done after verification of the actual range.
The actuation range is limited by the DAC ouptut (2^18/2=131072), which can be transposed in urad for Pitch and Yaw. The chosen numbers can be found in the following documents (HLTS and HSTS), in the spreadsheet page 3.

https://dcc.ligo.org/DocDB/0100/T1300083/001/T1300083-v1.pdf
https://dcc.ligo.org/DocDB/0100/T1300079/001/T1300079-v1.pdf

Now the sliders go from +/- 4195 for HSTS Pitch, +/- 7828 for HSTS Yaw, +/-4409 for HLTS Pitch, and +/- 1708  for HLTS Yaw (see pictures attached)

Technical details

In order to do that :

Created two adl files in /opt/rtcds/userapps/release/sus/common/medm/hxts
SUS_CUST_HSTS_M1_OPTICALIGN.adl
SUS_CUST_HLTS_M1_OPTICALIGN.adl
copied from
SUS_CUST_HXTS_M1_OPTICALIGN.adl

opened
SUS_CUST_${HLTS/HSTS}_OVERVIEW.adl in edit mode with medm
changed the name of the argument calling the adl file from SUS_CUST_HXTS_M1_OPTICALIGN.adl to SUS_CUST_${HLTS/HSTS}_M1_OPTICALIGN.adl

opened
SUS_CUST_${HLTS/HSTS}_M1_OPTICALIGN.adl with medm

changed the range
for HLTS  
from +/-12300 urads to +/-4409 urads for PITCH
from +/-12300 urads to +/-1708 urads for YAW   

for HSTS
from +/-12300 urads to +/-4195 urads for PITCH
from +/-12300 urads to +/-7828 urads for YAW  

Modified the label above the gain from :
[DAC Counts (in EULER Basis)] into [Counts (in EULER Basis)]

svn added and commited the new and modified files in the following folder : /opt/rtcds/userapps/release/sus/common/medm/hxts

Here are the Tfs and Spectra Test results for I1-MC3.

Betsy noticed that the BS screen was in a bad state, with gains and offsets and matrix values not filled in, despite the fact that I'd done setup on it back on 2/18 (alog 5440). It turns out it was because although I'd created 

/opt/rtcds/userapps/release/sus/h1/burtfiles/h1susbs_safe.snap

there was no symbolic link

/opt/rtcds/lho/h1/target/h1susbs/h1susbsepics/burt/safe.snap 

pointing to it. So after the various restarts between now and then it was not getting correctly restored. I created the link and checked that the correct settings were loaded when I restarted the model.

Michael V., Nichole W., Scott S., Gerardo M., Jodi F., Jim W.

Both suspensions for the ITM Elliptical baffles were installed succesfully.  Both baffle "boxes" are not installed, but they are being stored insided the beam tube for now, they can be installed at a later time.  We still need to remove a couple of loose pieces of equipment from inside chamber, such as a "table" and a "lifting" jig, they will be removed some time today.

Big thanks to the Apollo crew for their help (Scott, Chris, and Mark).

Max, Sheila

We went out to the Y end and first tweaked the alignment of the beam from the fiber using a fiber laser (there is such a small amount of light coming from the PSL fiber that it is difficult to see.)  We saw a beat note easily once we had all of the cables connected correctly.  We checked that this signal gets all the way to the timing comparator, (frequency counter?) and we saw that the other input to the timing comparator is at 79.2 MHz.  However, the beckhoff channel for the beat note frequency is always 0.  

We moved on to locking, we were able to lock (using only the PZT, no temperature control) with the laser current at 1.737 and the temperature at 31.45, with a common gain of -22dB and fast gain of -4 (giving a ugf of 3.5kHz).  The OLG measured with these settings is attached, I was able to turn the gain up a bit (ugf around 10 kHz) but the lock was not very stable there.  

The next steps are to turn on the temperature control and get the frequency counter working again.  

Kiwamu, Keita, Filiberto, Rich

Finished installation of all RFPD cabling inside ISCT1.  Received LSC diode by Fedex from Caltech.  Ran through same procedure as Lisa and Matt did when they verified the calibration of the MC length diode in log entry 5277.

Data Taken on LSC-REFL-AIR-A RFPD

System Constants:
LSC Detector Serial Number - S1203919
LSC Detector Frequencies - 9 MHz and 45 MHz
LSC Detector RF Transimpedance - 341 ohms at 45 MHz
LSC Detector DC Transimpedance - 100 ohms at BNC Jack on detector body
LSC Detector Photodiode Responsivity at 980nm - 0.67 A/W
Laser Calibrator Head Serial Number - S1300150
Calibrator Output Power - 4mW at 980nm
Calibrator Head Gain - 13 mW/V (From Lisa and Matt)

Measured Parameters:
RF drive amplitude into calibrator head - 0.1Vp-p at 45.497379MHz
DC Output of RFPD Head (at BNC) - 0.165 VDC
Measured Counts of RFPD DC - 538 Counts (consistent with DC output of head and factor of two differential gain).
I and Q beat note counts - 3400 Counts p-p
Measured RF input to demodulator - 180 mV p-p at 45... MHz

Calculated Parameters:

Responsivity = 538 counts/(1638 counts/V * 200 V/A *4e-3 W) = 0.41 A/W (0.37 A/W by Lisa and Matt)

Expected RF to Demodulator = 341 V/A * 0.41 A/W * 0.013 W/V * 0.1 Vp-p = 182 mVp-p (180 mV measured)

Check of Laser Calibrator Head against LSC RFPD measured parameters:

(This calculation must correct for the amount of light that doesn't hit the RFPD diode.  This is seen in the last calculation:)

Calibrator head gain = 0.180 Vp-p / (0.67A/W * 341 V/A * 0.1 Vp-p)  = 7.9 mW/V

The incident power and observed DC photocurrent requires following correction factor:
4mW * 0.67 A/W * 100 V/A = 268 mVDC vs the actual measured 165 mVDC, therefore the correction factor of 268/165 is applied
Calibrator head gain (corrected for light spillage) = 7.9 mW/V * 268/165 = 12.8 mW/V (vs. 13 mW/V from Lisa and Matt)


Conclusion is that the LSC REFL-AIR-A RFPD and calibrator head seem to be functional within reasonable levels and is in agreement with the measurements taken by Matt and Lisa.

The BSC5 dome leak repair effort worked (unaided annulus ion pump in equilibrium @ 8 LEDs with X-end vented) 

John W. started roughing the X-end earlier today -> I closed the safety valve then the 10" valve @1615 -> will resume pumping tomorrow

For the record, this afternoon, Travis aligned the lower stage AOSEMs of the PR2 now that it is aligned.  He also cleaned out tools from the chamber.  I spent some time cleaning with isopropanol and contec wipes some of the horizontal surfaces from the south end of the chamber, namely the ISI table and the floor and bellows near the cat-eye baffle. 

Are all working,I tested with an out of vacuum picomotor plugged into the connectors on the front of the controller, combined with the test done in vacuum with the hardware tester it seems like everything is working.  

One problem was that in the system manager here, we had the 8 bits of PICOIn.MOTOR_X and Y connected as bytes in the system manager, while they need to be individually connected as bits. 

I also added a message that appears for 2 seconds when someone tries to drive a motor but the step size is 0.  

Sheila