The H1 SUS PR2 "safe" burt file was updated and committed to the "cds_user_apps" SVN repository locally in:
'/opt/rtcds/userapps/release/sus/h1/burtfiles/h1suspr2_safe.snap'

This is the file that is SVN version-controlled in the above directory.  A soft-link pointing to this particular file was created in the directory:
'/opt/rtcds/lho/h1/target/h1suspr2/h1suspr2epics/burt/'

with the name "safe.snap" for use by the startup scripts when re-booting the "h1suspr2" Simulink user model.

[Jax, Elli, Alberto, Keita, Daniel, Bram]

After relocking the RefCav we started locking the Arm and setting alignments. Jax and Elli are running the mode-scans.

HAM-ISI Unit #7 - Assembly Validation Testing was validated today. We can now proceed to storage of the unit for future insertion in HAM4 Chamber.
 

Please join me in congratulating the members of the SEI Assembly Team who successfully assembled all of our 7 aLIGO HAM-ISIs  

Reports regading the Assembly validation of previous units at LHO are available in the DCC:

HAM-ISI Unit #1 - Assembly Validation

HAM-ISI Unit #2 - Assembly Validation

HAM-ISI Unit #3 - Assembly Validation

HAM-ISI Unit #4 - Assembly Validation

HAM-ISI Unit #5 - Assembly Validation

HAM-ISI Unit #6 - Assembly Validation

Reports regading the Chamber Side testing of other units at LHO are available in the DCC:
HAM2 (HAM-ISI Unit #4) - Chamber Side Testing
HAM3 (HAM-ISI Unit #5) - Chamber Side testing

Note: Earlier this month we added an Initial In-Chamber Testing section to the HAM3-ISI Phase II - Integration Process testing report. This report has now two sections:

• Chamber-Side Testing: tests performed in the LVEA, after the Assembly Validaton, and before the insertion of the ISI in chamber.
• Initial In-Chamber Tesing: Tests performed after the insertion of the ISI in chamber and before the installation of Suspensions.

This report will be completed with the future tests performed on HAM3-ISI unitl the begining of Phase III - Control and Commissionning.

Kate and I are checking grounding on MC2.  This will require disconnecting the exterior MC2 SUS cables from the chamber feedthru briefly.

The Simulink models for H1 MC1, MC3, PR3, and PRM were compiled, installed, and begun on the 'h1sush2a' FrontEnd this morning during the CDS Tuesday Maintenance period.  The H1 DAQ was also re-booted to begin recording the channels for these models.  All re-boots were clean with no apparent issues to note. 

For future reference, the peak in the ISS_rpn spectrum at ~120Hz appears to be caused by the NPRO's noise eater. It also explains why I had to lower the reference signal to -2.5 from -1.9 to get the diffracted power to a reasonable level (33% down to 2%). This was fixed by turning the noise eater off and on. The attached plots show the noise eater noise (iss_rpn-009) and after it was reset (iss_rpn-001).

This was caused by swapping the FAST cable earlier last week. I was able to set the reference signal back to -1.9 afterwards.

Removed temporary connection used for PR2 testing and connected permanent cabling from HAM3 feedthrus to SAT Amplifiers.

I have put together 4 optics in the Faraday Isolator, out of 7 that should be there eventually. These include:

Ca wedge polarizer s/n 12 currently on the input side
Ca wedge Polarizer s/n 03 on the output side
TGG crystal s/n 10, presently on the "long" tube together with
Quartz rotator

Still not assembled are:

2nd TGG crystal -- will put s/n 09 in tomorrow when Al-Bronze cap is out of the C&B oven
HWP and DKDP -- don't yet have the proper mounts

To install Ca wedges I used a slightly different technique. I cut two 5 mm long sections of the Indium rod, and rolled them together into one fat 5 mm long rod. I then pressed that rod onto the setscrew, and still had enough Indium thickness to tighten on the Ca wedge.

The TGG is installed with Indium foil wrapped around the wedge. I had to roll two slices of the Indium foil together, as the lengths (or even the diagonals) of the foil squares that were delivered are shorter than the circumference of the crystal.

The Quartz is installed withOUT the foil. Instead it contains at least 3 layers of the Indium wire on the cap side to keep it in place.

More photos may be found on the Resource Space.

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

The Simulink models for the H1 HAM2 suspensions were modified today to add the IPC part broadcasting the watchdog state to the HAM-ISI model via the Dolphin network.  For now, the watchdog state is broadcasting a constant "0" to first test the communication between the FrontEnds. After confirmation, the constant will be replaced with the correct WD state. The error signals for the receiving models were also added as EPICS outputs.  The BIO IPC communication for the four models were also implemented via Shared Memory on the 'h1sush2a' FrontEnd.  The ability to compile the models was confirmed via the "make" command on the "h1build" machine.  These changes will be installed on "h1sush2a" tomorrow during the Maintenance Day period in the morning.

The models modified were:
"h1susmc1.mdl","h1susmc3.mdl","h1suspr3.mdl", and "h1susprm.mdl"

The models were committed locally to the directory:
'/opt/rtcds/lho/h1/userapps/release/sus/h1/models/'

This morning, several spectra were measured to evaluate the performance of the ISI-BSC6 with different blend configurations:

• Damping (green)
• Stage 1 blend at 100mHz with T240 - Stage 2 blend at 100mHz (brown)
• Stage 1 blend at 250mHz with L4C - Stage 2 blend at 250mHz (pink)
• Stage 1 blend at 100mHz with T240 - Stage 2 blend at 250mHz (red)
• Stage 1 blend at 250mHz with T240 - Stage 2 blend at 250mHz (black)

The plot LHO_ISI_ETMY_Isolation_aLOG_ST1_Y_20120820_2.pdf shows non calibrated spectra of the T240s in the Y direction. Around 500mHz, the isolation is slightly better with the T240 in the super sensor (comparison pink and black curves - In both cases, the blend is at 250mHz).
The blend on stage 1 can be lowered at 100mHz (red and brown curves).

The plot LHO_ISI_ETMY_Isolation_aLOG_ST2_Y_20120820_2.pdf shows non calibrated spectra of the GS13s in the Y direction. The isolation impprovement seen on stage 1 are also visible on stage 2.

On both ISIs (BSC6 and BSC8), the T240s can be introduced in the super sensor (cf https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3858).

 

Serviced inter-cooler and after-cooler auto drain units

- OAT needs quiet today
- HAM5/6 and clean room cleaned
- 9AM, contractors to EX to install linolium
- 10AM - MichaelR to shut down PSL for power swap
- DaveF working in Laser Safe PSL w/glasses while the laser is down
- Keita to EY
- Patrick to LVEA
- Gerardo to LVEA test stand
- Eric to LVEA near rollup door
- Thomas near HAM4 doing Mode Cleaner Baffle assembly
- Jodi to EY to get ameristat
- Betsy, Calum, Norna, Lisa, Thomas,… out in LVEA

Fairly quiet day - some issues with DAC with planned fixes tomorrow - power swap on H1PSL - more work at EX preping for install - purge air fix in LVEA - some issues with OAT and Ref Cav unlocking.

Filiberto, Richard, Michael R

The PSL was moved off of the temporary power supplies for 24, 18 and 12V and is now running on the DC power supplies in the H1 electronics room. For the moment, we are still running on the temporary power supplies for high voltage (400V for PMC/ILS, and 180V for FSS), however they were moved into the PSL rack to free up room. The purple cables in the electronics room were redressed as well.

The PSL servos and laser were shutdown for this work, and the key from the control box was removed to make the laser and ante room laser safe (to make David Feldbaums work easier). I plan on turning the laser on tomorrow morning, so it will be off for the night. If all goes well with David's work we may go to high power tomorrow as well.

We ran a test on Friday to do scans measuring the cavity response to injected sidebands. These were run with the cavity cold and also with it heated. Unfortunately, the reference cavity lost lock before we turned on the ring heater. We locked up all the reference and arm cavity again after 2.5 hours of applied ring heater power. The cavity scan looked extremely noisy at this point - I think this indicated a noisy lock, rather than a severe mode-matching error. We lost lock on the reference cavity after 20 minutes or so and decided to call it a night.

The cold and hot cavity scans are attached below.

Details of the cavity scan measurement will be posted in another entry.

Yesterday the reference cavity could not stay locked for more than half an hour. Today I tried to improve the alignment to make the lock more stable. I doubled the transmitted power (from 45mW to 90mW on the monitor PD) by mainly chainging the alignemnt in Pitch.

The cavity stayed locked for 2.5 hrs but then the lock broke again for no apparent reason and despite the quiet at work today.

During the time it was locked, the arm lock was also good and stable. After re-aligning ETMY and ITMY I obtained 9000 cts at the REFL monitor PD for over 2hrs.

While the arm was lockedthe WFS sensing matrix. Like yesterday, I kep obtaining an almost degenerate YAW matrix. The Pitch matrix was better and the integrator in the ARM_POS_PIT and ARM_ANG_PIT loops appaeared to be stable.

Before continuing with the work on the WFS we have to understand why the reference cavity has become so unstable.

[Daniel and Bram]

With the appearance of the laser PZT resonance in the FIBR servo loop, we made a notch filter. We measured the PZT resonance in a previous entry 3857 to be at 287.55 kHz. After some searching and going back and forth we decided to go the easy way, using a passive notch filter (schematic attached 'FIBR_PZT_NOTCH.pdf'), which Daniel already has used in the TTFSS.

By the lack of finding the right capacitors, we used a 500 pF and a 100 pF parrallel, with a 0-100 pF variable capacitor (oh and we got a 470 uH SMD inductor!). With the help of EE-Dave we managed to pack it into a pomona box.

Also attached is a discustingly bad phone photo of the measured response (the RF analyser has a naughty floppy disk drive).

All in all success. We plugged it in and it worked, we can lock the FIBR Servo with a UGF of 28 kHz (another log entry will follow when I get the data from the disk).

PR2 was installed in HAM3 today, and traveled well on the Genie and Arm.  It's sitting against it's cookie cutter, and dogged down overnight.  The crew was Kurt Buckland and Scott Shankle, as well as Deepak and I