Terry, Arijit, Sheila, Daneil

We started by using the scanning OPO to align the transmitted red beam through the two apertures on HAM6 (we mechanically moved ZM1 in yaw but not pitch) to the temporary DC diode we have installed in homodyne path. We scanned the OPO and saw that our seed beam wasn't well aligned to the OPO.  We adjusted pitch on the 1064 collimator, and a small yaw adjustment.  We hadjusted the TEC temperature to roughly align the red and green resonances (for the current crystal position).  Daniel helped us get the OPO locking and we were able to see the amplification and deamplification of our seed beam. We didn't try to optimize the temperature or crystal position yet.  We are not scanning the seed phase but the ambient excitation is large enough that it is scanning very quickly on its own (purge air is rather high and the table is locked). 

With this fairly bright red beam generated by the squeezer we removed the septum window protector and looked for a beam returning from HAM5, but see nothing.  Daniel and Arjiti added excitations SRM, but we still didn't see anything, so we decided to leave excitations running overnight on SRM and ZM2 and look in the morning at AS QPDs to see if the beam hits them.  We have left the LVEA in laser hazard for this reason, and left the two soft covers with a small opening for the green beam to reach SQZT6.  

If we see nothing overnight we will try to taking a look through viewpoints on HAM5 tomorrow. 

The mode-matching lenses were adjusted to produce a beam diameter of approximately 280 um, 76 mm away from the
input window of the power amplifier.  The two-lens solution, using a nominal -50 mm and 80 mm focal length lenses,
is very sensitive to the position of the second lens.

    The power amplifier was turned on, without any incident beam from the front end laser, without anything
untoward noticed.  A low power beam from the front end laser was put into the amplifier and an amplified beam
was observed coming out.  There is still some alignment work to be done to see what the output power of the
amplifier will be, in addition to mode matching and alignment to take its output through the rest of the optical
train.

    The amplifier was operated without the shutter, as we do not have the parts in hand to complete fabrication
of the shutter.



Ed, Georgia, Peter

Current state: ISI is locked down on stops; the platform is NOT balanced, Corner3 CPS Feedthru is held by just a bolt or two, there appears to be a short to ground on the V3 CPS cable.

Again w/ much help from Corey, we determined that the Corner3 CPS H & Vertical connections in chamber were swapped.  Similar to the swapped Coil Driver cables which made damping impossible, the swapped CPS cables made isolating problematic.  The swapped CPS cables of course made balancing the table sort of confusing but pretty clearly explains the big 'horizontal' shift we were seeing when the platform was locked:  What we thought was balanced was anything but what we thought and locking the locker was just pulling the vertical back into a reasonable place.

The excessive noise seen on H3 led us to breaking the seal on the feedthru and during this process, the V3 signal went to the negative rail which implies a short to ground of at least the sensor shield and/or maybe, the sensor core to its shield.  We pulled the copper braided shield back as far as we could but could find not even a subtle break in the insulation exposing internal shield to the grounded copper braid.  While manipulating the cable looking for the short, there would occasionally be a reasonable signal but we were unable to isolate a definitive bad spot.  We must continue this as balancing is not possible until we have the three vertical CPS signals.

In the morning we'll move the cabling to a better place for working and looking for the short.

Summary of new features:

• Blends and sensor correction will be split into two separate nodes.
  • This cleans everything up and helps simplify how/when the SC can be changed.
  • We are currently not changing the HAM blends so they don't get a BLND node.
• Most of the states and edges are now auto-generated from a single configuration file.
  • The user can simply change the name of configurations, filter banks, filters, etc. in the file and then load the node. No editing of code necessary. This is very similar to how the rest of the SEI Guardian code is written. I tried to stay consistent at least.
• Allows for two different ways to switch sensor correction.
  • We do it slightly different compared to how LLO wants to do it, so I wrote both in.

Longer explanation of work:

All of the old SEI nodes that ended in *_CONF have been destroyed (a total of 15), and have been replaced with one or two other configuration nodes. Every HAM and BSC stage now has a sensor correction node (15 in total, name ends in *_SC), and each BSC stage also has a blend node (10 in total, name ends in *_BLND). Back in September, I tested the SC code on ITMX (alog38588) in preparation for this new setup but ran out of a time and a window to implement it. This week was looking to be perfect time to get us into our new configuration setup. The old setup was a product of JIm and I figuring out how to run the blends and sensor correction together to move the IFO into different seismic configurations based on what the environment was doing. We seem to have settled on a good way to do it after O2, but the old nodes were getting too complicated. A rewrite was necessary.

Breaking each CONF node up into separate blend and sensor correction nodes made them a bit more straightforward. I also changed it to read a large configuration file to obtain and create all of the necessary states and transitions. This is how much of the other SEI Guardian code is, and I felt that it helped the SEI team to make changes a bit easier. Plus, I've found that staying consistent with code within subsystems is generally helpful.

I tested the new nodes on ETMY first and checked with Jim before pushing it through to the rest of the chambers. I still have a bit more name changing and a few settings to change tomorrow, but all of the nodes seem to be running well.

Still left to do this week:

• Adapt the SEI_CONF manager to work with the new nodes
• Write an INIT state
• Clean up code and add more comments
• Update all of the medm screens that have the old nodes
• Possibly rework the Guardian Overview screen, if time permits

I've attached a shot of the current overview for your viewing pleasure.

Since the SEI_CONF manager is not able to communicate with these conf nodes yet, for tonight we cannot use the "LARGE EQ" button, or use it to turn off BRS corrected sensor correction. The BRS is not a big deal at the moment since those paths are all turned off.

15:00 M&M to ham6, testing platform
15:40 Tvo starting TCS table to work on guardian
16:10 M&M to HAM6
16:10 Fil to LVEA
16:30 Chandra & Kyle to MY
16:30 Corey & Hugh to HAM6
16:45 Betsy Travis to EX
16:45 Chris to LVEA
17:30 Mark to EX for beckhoff safety breaker
18:00 Fil & Patrick to CS mezzanine
18:30 Ed, Peter, Georgia to PSL
20:15 Chandra, Kyle & Mark to MY
21:30 Sheila, Terry, Arijit to HAM6
22:00 Hugh Corey to HAM6
22:15 Fil to MY
 

This morning, Travis, Mark D and I mated the ETMX lower QUAD to the install arm/elevator which is attached to the chamber door (see renderings in E1100832 BSC Arm user guide if interested).  We then made the final structure disconnections between the lower and upper QUAD structures and then pushed and rotated the lower unit out of the chamber.  The ACB was swung back for this (using the wedge), however the TMS was not.  Like at EY last month, the elevator is able to just slide in and rotate around the QUAD which sits sandwiched between the ACB adn TMS.  As is the typical sequence, we then used the blue Genie duct jack to pluck the lower unit off of the arm/elevator and place it onto a LSAT (lower structure assembly tooling) cradle and trolley (picture attached of final placement for the day).

This afternoon, Travis and I got the AERM out of it's air bake oven (epoxy curing air-baked last Fri), put it in it's cake tin, and took it to the end station for install.

We then started rearranging the furniture in the cleanroom area designated for the fiber welding scheduled to start next week.  However after shuffling things many times, we are still struggling to work out how to make safe maneuvers with fragile fibers in this space.  (Every weld cleanroom ends up being configured differently because each time we're in a different area with different room parameters - the hidden "beauty" of mobile fiber welding.  In the current case, we are using part of a big cleanroom which has the beam tube, VE and OPLEV equipment running through it, with a joining smaller ~10' cleanroom attached.)  We aborted the effort at the end of the day with no great solution - Travis will get with Bubba in the morning to see if another round of CR shuffles will help.

   Vacuum pumps at End-X and CS are running fine. Temps and vacuum pressure are well within spec. 

   Found the Pump at End-Y had failed. Found the backup pump has also failed, which is very strange as it had not been run since it was tested before going into backup. There was very little carbon dust in the pump housing, which is expected in a pump that had just been put into service. Will investigate why the vanes, which were not worn had fractured. 

   Put the backup pump from End-X into service at End-Y and am ordering the necessary repair parts to get the two backup pumps back into warm standby state.  

WP 7400

Installation of cables and fibers for the access controls system continues. List of the electronics that have been installed:

E. Castrellon, F. Clara, R. McCarthy, M. Pirello

I've expanded my TCSY glitch investigation to include L1 TCS signals.  The attached plots recreate my H1 plots in alog 41039, and now include the corresponding L1 TCS signals.  Most noteable in the L1 TCS LASERTEMPERATURE signals is a noise pattern on top of the DC temperature signal, and in H1 TCSX has regular noise glitches, both directions, and TCSY appears to have the same glitches, just constantly.   The FLOWRATE signals in H1 and L1 are very similar.  The QPD B SEG4 INMON signals in H1 show instantaneous level changes, and some downward spikes, and the L1 signals show some upward spikes, but no level changes.  All plots show raw data, each is about 10 minutes in duration, H1 signals in blue, L1 signals in red.

Kyle, Dave:

The regen overtemp interlock is still bad, we are bypassing cell phone alarms for this channel for a futher 24 hours (expire Wed Mar 21 11:41:33 PDT 2018)

   Added 150ml water to PSL crystal chiller. Diode chiller water level is OK. No changes in the filters. 

(Gray, Radkins)

BACKSTORY: 

After the major balancing & floating of the HAM6 ISI (due to adding the new OPO to HAM6) last Thurs, we have not been able to isolate HAM6.  The thought is there is a mechanical issue (i.e. cable pulling on system?).  Another symptom (related?) is related to the Capacitive Position Sensors (CPS).  This is relegated primarily to Corner 3's horizontal (H3) CPS; it has a large value on the order of -13000 counts (roughly an order of magnitude more than normal).

YESTERDAY'S ACTIVITIES:

Before working in the chamber Hugh did some electrical checks:

• Power cycled the CPS portion of interface chasis for Corner 3 (which also turns of the sattelite rack) in the CER.
• Reseated cards at the Corner 3 satellite rack (at HAM6)
• Jiggled Corner 3 CPS cables at flange (in-vac & in-air side) at HAM6

Saw some minor change with the cable jiggling at the flange.  But for the most part no change.  This is when Hugh went in to look at possible cables pulling the system & to also clean up/remove the spools of newly-added Squeezer Silver cables.  The Squeezer cables were removed from the ISI and tie-wrapped to the wall tabs of the HAM6 chamber).  Since these cables were pulled off the ISI, we will need to add weight to the table and then re-balance.

After removing the cables above, unfortunately still saw the large H3 CPS values.  So this remains an issue.  This is where we ended the day on Monday.

TO DO LIST:

• Continue to investigate the issue with H3 CPS. 
• Add weight (due to Squeezer cables were pulled off) & rebalance the table.

NikoL, RickS

With the removal of the ETM camera relay mirrors from the Pcal periscopes, the Pcal ETM cameras are no longer useable.

Thus, we removed these systems from the A7 Adapter ports at both end stations.

Before/after photos attached.

Note that the red-anodized gates (guillotines) for the viewport protectors are still in place.  These have round pieces of black glass glued in rececces in the side facing the viewport.

This morning I got a little bit of time to try some more debugging of ZM1. Jeff Kissel's last alog (lhoalog41034) showed a big feature in the Y to Y measurement and a possible issue with the LL flag/magnet. After team SEI was done with their work and locked up the table, Corey and I checked all around the the suspension for anything that might look or feel wrong. I looked all around the LL OSEM for anything that might cause a problem but didn't find anything. I recentered the OSEMs on  their flags and then we ran the measurements again. No change.

During a lunchtime talk with Betsy, she suggested that I try to run the Y to Y measurement with the top OSEMs backed out and not actuating, and then do the same with the bottom. When I tried it, it looked like the lower frequency feature was much smaller when the top OSEMs were backed out (see attached). I got excited and tried this for pitch as well, but didn't notice much of a difference. This ended my day in HAM6 as I had other teams nipping at my heels.

16:45 JeffB transition LVEA to laser safe
17:00 Hugh & Corey to HAM6 for CPS work
17:00 PeterK & Ed to PSL enclosure
17:30 TJ to HAM6
17:45 JeffB to LVEA
17:45 Betsy & Travis to EX
19:30 Sheila found sqz and isct6 lasers still on after morning laser safe transition
20:15 Betsy & Travis to EX
20:15 M&M to HAM6
21:30 Peter to PSL
21:30 TJ to HAM6
22:00 Fil to LVEA
22:15 RickS Niko to EX, EY to remove PCAL Camera
22:15 M&M to HAM6

22:45 Sheila transition LVEA to Hazard
 

Laser Status:
SysStat is good
Front End Power is -0.003262W (should be around 30 W)
HPO Output Power is -0.04724W
Front End Watch is RED
HPO Watch is RED

PMC:
It has been locked 0 days, 0 hr 0 minutes (should be days/weeks)
Reflected power = 0.008512Watts
Transmitted power = -0.02508Watts
PowerSum = -0.01657Watts.

FSS:
It has been locked for 0 days 0 hr and 0 min (should be days/weeks)
TPD[V] = 0.06625V (min 0.9V)

ISS:
The diffracted power is around 3.3% (should be 3-5%)
Last saturation event was 14 days 2 hours and 58 minutes ago (should be days/weeks)

Possible Issues:
Front End Power is Low
FSS TPD is low
LRA out of range, see SYSSTAT.adl
 

Following the installation of the improved TEC controller for the SHG, we started tuning the loop.

Figure 1: A single pole at 0Hz, a zero at 100mHz and with 10mHz selected in the ugf box. There is a fair amount of overshoot and it takes a long time to settle.

Figure 2: The zero has been moved down to 10mHz.

Figure 3: The zero has been moved down to 5mHz.

Figure 4: The zero has been moved down to 7mHz. The overshoot is about 20%. We are sticking with this value for the zero.

Figure 5: Pole at 0Hz, zero at 7mHz, another pole at 1Hz, gain of -1, ugf box set to 30mHz.

Figure 6: Response measurement at 30mHz, indicating that the ugf is around this frequency.