- IO_AB_PD2 and IO_AB_PD3 are now wired from the PSL table to the PSL rack.  IO_AB_PD2 has light, IO_AB_PD3 is not yet in place.

- IO_MB_M2 was swapped from the 2" 10% trans. optic to the 1" 2% trans. optic, BUT the 1" optic alignment and mount and optic all have issues, so the 2" optic and mount were reinstalled at the end of the day

--- optic mount (U100) needs 3 actuators to adjust the plane of the mirror - actuators interere with the blue mount

--- blue mount needs to be altered

--- 1" optic may have 2 small dings on the back side - I need to reclean it and verify

--- spare optic is completely screwed up with First Contact - has the old clear FC and would not come off - peek was pulling out o the FC - I applied red FC and a new peek tab, and still the clear FC is stuck to the optic, and of course it's stuck to the front side that will see high power - not sure how to save this optic right now

Alignment Irises I have on the table - with beam changes they are no longer centered, so here's the "code" for the good alignment

- High and left on my alignment iris after the bottom periscope mirror
- Centered on my alignment iris on NW corner of the PSL table

I'll center the irises after the new components are installed in the main beam.

To do list:

- install motorized rotation stage

- fix IO_MB_M2 mount and install 1" 2% trans. optic

- install IO_AB_PD3 - power before rotation stage

PRMI is finally aligned and it is now flashing. This should help us to find the POP beam because of higher intra-cavity power and reasonable alignment.

After PRMI was coarsely aligned, I went to ISCT1 and quickly looked for the POP beam, but no beam was found. I also toggeled the HAM1 POP beam diverter, but it didn't help.

The above plot is an exmaple of time series where you can see that ASC_POP_A goes up to more than 100 counts because of the recycling.

Alignment:

• I started from yesterday's condition in which the beam was centered on ITMX (see alog 8996)
• Using PR2 and PR3, I adjusted the yaw alignment such that the beam goes through the center of both BS baffle and ITMX.
  • This pushed PR2 from -220 to -2270 counts in its DC bias.
• I steered ITMX and found the PRX fringe.
• Then I moved onto the PRY alignment.
• Keita suggested to take a look at the BS BOSEMs to see if they are at a similar position to that of HIFO.
  • According to the BS BOSEMs, the pitch angle is different by -800 urad from that of July 25th.
  • This large pitching sort of made sense -- because the BS was tiltled so much that the incident beam needed to be low on BS to hit ITMY. Indeed we saw that the beam was low on BS when PRY flashed.
• We cahnged the BS DC bias to get the same pitching as July 25th.
  • Pitch DC bias went from -159 to 44.81 counts.
• Then, I tweaked ITMY in pitch and yaw and BS only in yaw until PRY flashed.
• We should also check the BS yaw by looking at the BOSEM readouts and possibly steer it back to July 25th while keeping the fringe by steering ITMY yaw.

Chris, Aaron, Filiberto, Daniel

Thanks to a very motivated crew we have fabricated 2 PD amplifiers for the ITMX and ETMX baffled diodes. The amplifiers are installed, powered up and connected to the slow controls system. The software for ETMX is ready. We still need to activate and test ITMX. The channel names are H1:AOS-ETMX_BAFFLEPD_1/2/3/4 and H1:AOS-ITMX-BAFFLEPD_1/2/3/4.

I fixed the fast readbacks for the common mode boards and the power monitor PDs at the X end.  (Their AA chassis was plugged into the wrong ADC.)

The "Red Path" PDs on the End X overview screen are not working yet.  But they should be, as soon as Cable 86 (which carries them from the field rack to the AA chassis) is installed.  It's on Fil's to-do list.

I remeasured the powers in the ALS fiber path, this time without a filter on the power meter.  

10.15mW out of ref cav

95uW into path to fss_TPD and camera (TPD currently reads 0.98V)

9.8mW into ALS Faraday

9.08mW out of Farady (HWP is set to 51 degrees, QWP set to 101.5 degrees)

1.77 mW into fiber external PD (5.54V on fiber external PS readbacks) (before I had measured this with this filter on, and got 1 mW, that is why Alexa found a high responsivity for this PD)

7.2mW into fiber

FIBER internal (which monitors the power received from the fiber in the distribution box) reads 1.71, I just measured 4.78mW returning to the PSL when the two fiber ends by the distribution box are connected to each other (there is at lest 4.78mW getting ot the fiber distribution box).  

Per Dave's recommendation, we have removed the cds_ezcaread "disconnected" at the top levels of our real time models (they were causing troubles to record the slow channels under the latest RCG version).

Those were used in the early days to monitor the suspensions watchdog states. This feature is now done through IPC_CPIE but the old ezcaread were still in there.

I found ezcaread blocks in all models except isiitmx and hpiitmx. Did not find any in the ham-isi and ham-hepi models. 

Dave said there's no rush to recompile for now (work permit will be issued when the models will be recompiled and installed)


Side note: we still have to implement the suspension watchdogs monitoring through IPC in the hpiitmx model.

Today I "burped" GV7 and GV20's unpumped gate annulus volumes into aux. pump carts -> I also valved-in IP12 and IP5 (I had originally tried IP6 before IP5 but it didn't step its HV and had minimal net pump speed with its fixed HV value - I'll need to change IP6's controller settings to operate in "step" mode) -> If we do end up opening up the CS and X-end to the BT, I'll valve-out the respective turbos such that no rotating pumps are valved-in while the BT is exposed.

TF running on ETMX HEPI. Should complete sometime in the morning. Running from opsws1.

Today's Activities:

• Disabling Capacitive Position Sensors (CPS's) for ITMx & ITMy ISI's for a noise test for master & beating (Hugh, Jim, Fabrice)
• Cheryl working on PSL today (along with Sheila)
• LVEA Commissioning crew:  working on cameras in the morning
• HTTS Model work continues (Dave, Jim, Jeff)
• Landry & Kai scoping shots along X1 Beam Tube
• Inductive Position Sensor (IPS) work on ITMX HEPI (Hugh, Jim, Fabrice)
• Removing Demod Board from AS Rack (Jamie)
• PSL Beckoff work (Daniel)
• Dave/Jim B working in CER
• Pump carts connected to GV7 (LVEA) & GV20 (EX) by Kyle
• Network cable being pulled at EX (Filiberto/Aaron)
• SR SUS staging work (Jeff/Andres)
• Filiberto needed to run some cables around HAM3 (notified Kiwamu of his rumblings)

Detected a large shift this morning on the IPS readings for the ITMX HEPI.  Turns out the Pump Station Controller Servo had died this morning just before 0800pst.  This would have affected all corner station HEPIs.  The pressure data stayed locked at 80psi even though it was very obvious we lost pressure.  The servo must have stopped pushing motor speed and it just went to zero.  I'll see if Dave has any suggestions.  We'd have gotten an invalid data alarm (if we had alarms on this, like we should) and maybe that is good enough.

There was construction activity up on the Mezzinine with the TCS chillers this morning; possibly related but it certainly isn't the first time work has been going on up there.  Anyway, it has been sometime since this or any of the HEPI PS controllers have hung up.  We found the computer running but unresponsive to local or remote I/O.  So we power cycled the DC power supply and once it responded :

ssh controls@h1hpipumpctrll0  (password is not standard)

cd target-new

sudo ./run

This restarted things in a safe non-running mode.  The motor speed was manually ramped up to get near 80 psi on the supply pressure and the servo was then engaged with no problem.

Looking at the ITMX Inductive Position Sensors we see that the system did not return exactly to where it started but that is expected.  But the changes are pretty small with the largest local shift less than 1 mil and the rest all being less than 1/2mil (.0005")

Sheila, Keita, Alexa

Temperature changes in end X (from turning on or off cleanrooms) can mislaign the refl diode.  The behavoir in the X end seems similar to what was seen at the Y end in July (alog 7146).

After Alexa realinged the TMSX yesterday (alog 8987) and turned the cleanroom on again, there was a temperature change by about 0.5 deg C in 202B.  as the temperature settled you can see the drfit in the ALS input PZT sensors,  the retro-reflected beam started to fall off the diode, and there were drifts  in HEPI sensors, and bosems.  (attached plots)  I fixed the calibration for the PZT sensors (they are urad now) just before Alexa did her realignment, that is why there are no earlier trends that are usefull. 

I recovered the beam on the diode by moving TMSX just now (11:50 UTC), I moved it by +4urad in YAW.  The current alingment offsets are 13urad PIT, -319 urad Yaw. 

HEPI moved less than 1urad in RZ, not enough to explain the shift we saw.  Fabrice said that this amount of motion is not surprising, but that it would be reduced once position loops are commisioned. The TMS bosems do indicate a change of 4urad in yaw (I'm not sure if there is a relative minus sign or not)  Jeff suggested I look at the ISI CPS, it seems like the changes due to the temperature chage are less than 100 nrad in RZ and RY, for both stage 1 and stage2. 

Conclusion:

Temperature changes of less than 1 degree C can shift the TMS alingment by 4urad, this is enough to misaling the ALS refl diode.  The last plot attached is a one year trend of the temperature at end X, temperature shifts by about a degree C are not unusual, so we may need to find a long term solution for alignment onto this diode.  The short term solution is just to leave the cleanroom off. 

I will leave things alone for a few more hours to make sure the alignment stays stable after my realingment, then turn the cleanroom off again tonight. 

The 2 Thorlabs photodetectors on the PSL table monitoring the DC power after the EOM (IO_AB_PD3) and after the rotation stage (IO_AB_PD2) had their readback cables connected to the EtherCAT auxiliary signals concentartor 3 in rack ISC-R4. IO_AB_PD2 is connected to Extra1 (rear) and IO_AB_PD3 is connected to Extra2 (rear). Slow controls channels have been added to H1ECATC1 PLC1. They are available as H1:PSL-EOM_A_DC and H1:PSL-PERISCOPE_A_DC.

This is just a note of which camera is directed to what:

We've turn the two test mass Capacitive Position Sensors off to investigate the comb feature seen at LLO and possibly starting to reveal itself at LHO.  The thought is that all the CPSs have their own master timing for each chamber and the individual chambers may be beating against one another.

We'll restore these in a couple hours.

Yesterday we adjusted WFS1 path.

From some calculations by myself and Lisa Barsotti plus an assumption that MC mode cannot be THAT bad, I concluded that there isn't that much of a difference between moving everything to optimize VS moving only RM2.

Detailed analysis will follow shortly, but it seems like we're at not too bad, not too good position and if that turns out to be the case we'll stop here.

For example X waist location is already perfect, the waist size is smaller than ideal and the Gouy separation seems to be 114 deg or some such. Y should be worse.

Before calling it a day, we looked at RMs and one of the eddy current dampers for RM2 was significantly closer to the mirror holder than everything else, so it was backed off.