Ryan And I drove to EX and TJ drove to EY. 
Ryan and I turned off the HEPI VFD power supply then turned it Back on.
Then hit the reset button. 
The Pump then Whirled back to life !!! 
Then H1:HPI-PUMP_EX_PRESS_HIGH Flashed  Bright red for less than a second and the Interlock turned red and and the Whirling sound died.
Welp that didn't work.

We then ensured the setpoint:  H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_INPUT was set to 70.
Tried it again with H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_MODE set to manual. But we ramped H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT_TWEAK_REQ too fast(?) and H1:HPI-PUMP_EX_DIFF_PRESS_PSI  went too high and the interlock tripped again.
...
Then we tried a bunch of attempts to manually increase H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT to the value [2.29 V] that holds H1:HPI-PUMP_EX_DIFF_PRESS_PSI at 70 and Every time it would shoot well past 70 and trip the interlock again. 

We then opened up the control loop screen and noticed this integral term was set to 6. Which perhaps was too high.
So we hit the reset button.... H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_ITERM_RESET_REQ....
Thankfully that reset the Integral Term down to 0..... 

We then tried again to turn it all back on manually, and keep the H1:HPI-PUMP_EX_DIFF_PRESS_PSI at 70 PSI. Once H1:HPI-PUMP_EX_DIFF_PRESS_PSI was stable at 70 PSI we then switched over to auto. Now this Tanks the Output voltage that we just set to 2.29  ..... all the way down to 0.0...... ok...... then back up..... ok..... then over shoots to the moon, Again Tripping the interlock and shutting it down..... again. 
We tried using different H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT_TWEAK_SIZEs and otherwise tried to baby  poor lil HEPI  back into it's setpoints.... and it just wanted to FULL Send to the MOON!.

Then I had a weird thought... what if we set it too high? Will it go to 0? Will it go to negative Moon?! IDK but I wanted to find out. 

Really what I truly wanted was for H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_ITERM to simply go to the 2.28 value that allows H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT  to be 2.28 Volts which keeps the Diff pressure H1:HPI-PUMP_EX_DIFF_PRESS_PSI @ 70 PSI. But for some reason I cannot change that value Integral Value at all. Or atleast I couldn't directly....

So this is what I did: 
I set the output voltage a bit High....  such that the Differential pressure was just a lil too high. This is to convice the control loop to go down instead of Up. 
I then reset the Integral Term so it starts at zero when we switch it from manual mode to auto mode. 
Then I hit auto.... the Output voltage drops to 0 and comes back up.... but.... this time I'm ready! .....  I'm waiting to switch it back to Manual mode Right AFTER the output votage PASSES the output voltage that I want . This has now set both the Differential pressure, Output voltage, AND the Integral Value ABOVE  my desired destination. I let it settle a little high. THEN I clicked Auto again, which finally allowed the control loop to stablize at 70 PSI. 
We were on the phone with TJ at EY and that worked for EY as well.
Then we watched it for a bit and drove back to the corner station. 
Shoutout to Ryan S. and TJ for showing me the ropes and pointing things out that that helped me jump to my conclusions. 

TLDR: The Control loop overshoots when approaching from below. Approach it from above. It works for both End stations. ¯\_(ツ)_/¯

Item 1 on our commissioning for SPI is to figure out why we are not getting the same results for heterodyne efficiency in CDS as we did with an oscilloscope chamber side.

To evaluate the heterodyne measurement made by the measurement and reference interferometers we use the efficiency measurement of Vpp/(2*V_mean).

Ths is calculated by low passing the demodulated signal from each ifo in CDS and then multiplying by 2, befre dividing the demodulated signal by this mean. Shown in this photo here in the spi medm screens.

Jeff's firwst suspect was the low pass filter we use to get the mean demod signal.

The attached picture shows the raw demod signal on the left and the mean signal on the right. The mean for both looks roughly correct.

Jeff has put in a 4th order butterworth at 10Hz, see LHO alog #90638.

The roughing scroll pumps were valved out and shut down for overnight.  Pressure in the corner was ~2 Torr at the break.

Dave, Tony, and Jonathan

Supporting WP 13402 we did some prep work.

* Reviewed the work plan.

* Added the new daqd switches to the DNS as sw-msr-daqd[0,1,2].

* Configured sw-msr-daqd0 and moved it to its final position.

* Reviewed the inventory of fiber, nics, and optics.

* Put a hostname override into puppet the workstations and display machines to point them towards h1daqnds0 so that tomorrow we can take h1daqnds1 down.

R Crouch, R Kumar

This morning we took out ZM5 suspension from HAM7 chamber for replacing the broken PSAMS unit. Before removing  ZM5 we marked the current position of it on the ISI table using a machinist square - see picture attached for reference.

We then placed ZM5 on the table near the chamber and carefully removed the bottom PSAMS units (after removing the mighty mouse cable) - see reference picture. 

The replacement PSAMS shipped to us from CIT and tested at LHO (see alog 91005) was then prepared for installation into ZM5 cage - see two pictures for reference.

Tomorrow (Tuesday), our plan is to insert the wires and suspend the entire chain, balance it before moving it back into HAM7. 

R Crouch, R Kumar

CIT (Camille Makarem) shipped us a spare ZM5 PSAMS (s/n 03 with 72 in-lbs pre-load on the mirror for ROC 4.35m) for replacing the broken (strain gauge) PSAMS unit currently installed on ZM5 suspension in HAM7 chamber. We took the new unit out of the shipping container - see attachment01 , attachment02 and attachment03 for reference. 

We inspected the optic housing and optic and found no issues with it, posting two pictures for reference - attachment04 and attachment05. 

This new unit was then plugged into the electronics chain of ZM5 PSAMS in HAM7 chamber (the suspension was pulled out of chamber and kept on a bench outside HAM7) - see attachment07 and attachment08 for reference.

At first we checked the strain gauge resistance and the results are as follows,

Pin 12 & 24 = 708 Ohms (looks good)

Pin 11 & 24 = 355.9 Ohms (looks good)

Next we varied the PZT voltage from 0 - 200V and measured the Strain Gauge (SG) voltage and the results are posted in the table below,

The above test tells us the this replacement unit is healthy and can be installed in ZM5 suspension for HAM7 work.

In preparation for locking with the new BBSS, I have taken an inventory of the beamsplitter filters to note where various notches and bandstops are located by suspension stage.

As a reminder, Oli copied over much of the BSFM filters into the BBSS model, 90154.

M1: none as far as I can tell

M2:

• M2 LOCK L: Violin modes, butterfly mode
  • need to be measured and replaced, can wait until IFO lock
• M2 LOCK P and Y: FM5 BS bounce/roll, FM7 QUAD bounce/roll
• M2 OLDAMP P: FM5 BS bounce/roll, FM6 20 Hz bandstop
  • what is this 20 Hz bandstop for? can we turn it off?
• M2 OLDAMP Y: FM5 BS bounce/roll

M3:

• M3 LOCK P and Y: FM6 28.45 Hz notch
  • tracked down to alog 43968
  • can we turn this off?

Ibrahim and Oli have measured the BBSS bounce and roll modes to be at 19.80 Hz and 32.09 Hz respectively, 90319.

I'm replacing the bounce and roll bandstops on M2 LOCK and OLDAMP to be centered around these frequencies.

Old foton design string for "NotBR_BS":

ellip("BandStop",4,1.5,40,17.7,17.9)ellip("BandStop",4,3,40,25.7,26.4)gain(1.6788)

New foton design string for "NotBR_BBS":

ellip("BandStop",4,1.5,40,19.7,19.9)ellip("BandStop",4,3,40,32,32.2)gain(1.6788)

As a final note, I'm not sure how necessary the BR bandstops are if we have dampers, so we could consider not having any on at all.
 

TITLE: 07/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE for MAINTENANCE

Productive day in which:

• Corner pumpdown continued
  • HAM6 vacuum sensor PT110 - detected an increase/bounce of pressure. I informed Travis and VAC is looking into it. Screenshot is attached.
• HAM1 pumpdown started
• The LVEA is now in OPERATIONS SAFE, meaning all viewports and "holes" were confirmed affixed and closed. The lightpipe and lasers have not been turned on. Alog 90994
• Marc finished modification to the QOSEM whitening chassis and BBSS controls look healthy.
• DM10 Dust has been sitting at ~6800 counts for 1 hr (threshold is 300). Richard went out to investigate. A screenshot is attached in which the actual counts are on the left and the thresholds are on the right.
• HAM7 ZM5 work is ongoing.
• Biergarten PEM work on seismometers is ongoing.

Oli is taking over the remainder of this shift and will add comments if relevant.

LOG:

WP13410

Replaced multiple signal path resistors to reduce gain and adjust the filter to match work done at Caltech linked here.

Jennie W

As per work permit #13412 the SPI laser has been unshuttered using the shutter controller on the floor behind the R4 electronics racks.

This is to monitor SPI alignment as the pumpdown continues and uses powers below 100 mW.

See photo showing the demodulated signals for the Rreference and Measurement SPI interferometers after the laser was unshuttered at 18:08:11 UTC.

Matt, Camilla

We updated H1:AWC-ITMX_PD_{A,B}_TRANSIMPEDANCE and H1:AWC-ITMX_PD_{A,B}_RESPONSIVITY as per D2500105, as attached. 

I did a very quick search and didn't find any other posts, so I putting a plot here comparing the motion of the pre-vent HAM1 TT L4C passive stack motion to the current HAM1 ISI motion. ISI motion is generally 1-3 orders of magnitude better, only with a very narrow window at 15hz where the passive stack barely reached down to the ISI motion, but only for the x dof. Blue, green and brown are the ISI, cyan, pink and black are the passive stack.

Almost done with the st0 feedforward, X,Y,Z and RY are running. Still have to do tilt decoupling (which will improve low frequency motion), vac work at the chamber kept tripping the ISI during my measurements this morning.