The suspension HWWD ser. no. S1301701 has been installed in the DAQ test stand, and is currently cabled up and running. It is available for testing. Note: Initial values for RMS trip point and Time to Trip are 110.1 and 20.1 at power-up.
Jim and Dave.
We revisted the problem of not being able to control the HWWD unit when it is installed at EY, but the same unit works at other locations. We had tried the 4th DB-9 connector of the binary out chassis for both ETMY and TMSY. On the ETMY chassis all ports are used except the 4th, on the TMSY chassis only the first two ports are used. This afternoon we moved the binary out cable to the 3rd port of the TMSY chassis, and it works. We would like to connect the HWWD to the primary model (ETMY), so it would be good to verify the 4th port has a problem.
To perform this test, I modifed the SUS model h1sustmsy and compiled against RCG-branch2.8. The HWWD and SWWD systems are now ready for combined shake tests next week.
I installed the remaining SWWD systems in BSC 1,2,3, EX. This required new models for: h1iopsusb123, h1iopsusex, h1iopseib[1,2,3] and h1iopseiex. All were built against RCG-branch2.8. The SWWD MEDM was upgraded accordingly. All user models on these front ends were restarted to install the new IOP models.
8:15-8:45 Morning Meeting 9:00-9:36 Heading to End Y to get garbs – Karen 9:35- 12:00 Working on ITMx – Betsy, Travis, Joe 9:45-12:00 Heading to EndY to do some installations on Hartman tables – Greg 9:50-10:57 Contamination and Control work in LVEA – Jeff B. 10:35- HAM2/HAM3 cleaning – Christina, Karen, Cris 11:26- 14:04 Work on H1 PSL – Peter 12:04- Rebooting Frame Writer 1 (h1fw1) – Dave 13:24-13:45 Heading into the LVEA to unlock HEPI on ITMy – Jim 13:48- 14:07 Going into the Optics Lab – Jeff B. 14:30- Heading to EndY to remove IO cable from hardware Watchdog – Jim B/Dave 15:50-Going into the LVEA (Giving a tour) - Mike
Related to all of the shenanigans with ITMX, I unlocked ITMY HEPI to see if there were any big shifts after the ITM was re-installed. It has moved around, but not a surprising amount given the changes at the chamber, and similar to ITMX. I haven't looked at the level yet, but after the work at ITMX, I don't see any reason to think it's out of level, yet. Gaps on actuators and IPS's also still look reasonable.
h1fw1 has been unstable today. At 12:05 I took the opportunity while h1fw1 was down to power cycle its NFS/QFS file server machine h1ldasgw1.
There is a short gap in the frame files from 12:05 to 12:17 PDT.
I looked back through my notes of the pilot ITMx cartridge alignment from way back in September 2013 and the in-chamber alignment from November 2013 to see what the history of the height adjustments are with this quad. The ITMx height on the test stand is set with respect to the ISI table: we attach a calibrated height stick (with attached scale) to the ISI table and use that to set the total station 1742.0 mm below the ISI table; this is the desired distance the center of the ITMx should be from the ISI table. We then aligned the ITMx in height to this location. We started low by 1.6 mm, but adjusted to be high by 0.1 mm. The cartridge was then craned into WBSC3. I seem to remember Hugh setting the ISI table to its proper height prior to the alignment work (correct me if I'm wrong here Hugh). I then took the first set of numbers and found the ITMx to be 3.6 mm low. We still do not understand where this discrepancy between the cartridge alignment, Hugh's setting of the ISI table, and my 1st in-chamber look at ITMx comes from, but I should note that for the pilot ITMx we needed to raise HEPI by 3.6 mm, now for the production ITMx we need to lower HEPI by 2.8 mm; Betsy floated the idea that it is a possibility that the pilot suspension could have been long and the production suspension is correct, thereby causing the required HEPI adjustments.
At Betsy's suggestion I also looked back at ITMy to see if we could be walking into a similar situation with this optic. This suspension goes all the way back to WBSC8 in December of 2011. When this suspension originally left the test stand we were 1 mm low. After the in-chamber fiber break the ITMy was suspended by a wire for the H2OAT. In November of 2012 this suspension was moved to WBSC1 to be used for HIFO-Y and the most recent integration work. The ITMy on the test stand before install into WBSC1 had a height error of 0.2 mm low. Once installed in WBSC1, we began aligning in January 2013; the initial height error was high by 1.7 mm. We used HEPI to adjust the ITMy height error to 0.0 mm. This was the last time we looked at ITMy (~18 months). Looking at the other BSC chamber optics (BS, ETMx, ETMy), they all had initial height errors of <= 1.0 mm, and with the exception of the BS they all started high (BS was initially low by 0.4 mm, so no problems there). The pilot ITMx in WBSC3 had the largest initial height error we've seen here at LHO, and was 1 of 2 optics to have a negative initial in-chamber height error.
Installation Meeting Minutes Robert, Christina, Carolyn, Patrick, Aaron, Dale, Jeff B, Travis, Mitchell, Corey, Michael, Jim, Betsy, Keita, Richard, Peter, Arnaud, Daniel, etc. • Cleaning on HAM2/HAM3 – Christina • Assembly work continues in Staging building – Mitchell/Scott • Still problems with ITMX HEPI position. More work will be done (maybe completely re-doing HEPI) • Conducting experiments on HAM 6 (Structure resonances, damping, etc ) - Robert • Work will continue on H1 PSL – Peter/Oliver • Finishing Baffle work activities - Gerardo
Activities for Wednesday:
Installed Collars on all Picomotors for HAM6. These collars are clamped onto the shaft of the Picomotors and positioned up against the knobs of the Picomotors. (see attached photo)
Took photos of the OMC.
The ISI is Locked. And this completes ISC HAM6 work for this go around. Will next work in HAM6 when we have a beam and can align everything on the table.
model restarts logged for Wed 18/Jun/2014
2014_06_18 06:20 h1fw1
2014_06_18 20:17 h1fw1
unexpected restarts of fw1, maybe time for a solaris reboot.
High Power Oscillator Flow Sensors ================================== We replaced the water sensor block in the high power oscillator because the flow rate sensor for head 4 was not working and appeared to be jammed. Inspection of the water filters in the water sensor block revealed a number of particles and remnants of PTFE tape. After installation of the spare water sensor block, we noticed that the sensor for head 4 was not working, so a sensor from the previously installed block was removed and substituted in. Re-installation of the spare water sensor block was successful. The water was left on for a period of time to check for water leaks, none appeared. The chiller flow rate was between 18.9 and 19 litres per minute. Photos of the filters are attached. The filenames correspond to the head number. The last image is one of the flow sensor body. After completion of the installation, the frontend laser was fired up. The FSS and PMC were locked. Some problems were experienced with the ISS. We could lock the ISS but only with a relatively high diffracted power (~15-20%). Efforts to reduce the diffracted power were thwarted by the control signal to the AOM oscillating, even with the servo gain turned down. O. Puncken, P. King
After Jim "reset"/checked HEPI this morning, we went in and removed ~3mm worth of shims from the main chain. THis dropped the main chain down, removing some more of the height error. Note, we have no more shims to remove, so we'll need to be crafty in dropping the suspension masses further. Jason reports that we are still ~a few mm high (number to be reported by him shortly). We are wondering if the +3mm HEPI adjustement that was required for the ITMx-PILOT optic install months ago is needing to be undone now with this "real" suspension. We'll need to track down if we had a short pilot suspension compared to the monolithic we are installing now.
Apollo is gearing up to remove the doors off of HAM3, so I locked HEPI on that chamber. I plan on doing HAM2 tomorrow morning, unless plans change.
The following 12 channels are still unmonitored: H1:IOP-SUS_EX_ETMX_DACKILL_PANIC H1:IOP-SUS_EX_ETMX_OSC_CLKGAIN H1:IOP-SUS_EX_ETMX_OSC_COSGAIN H1:IOP-SUS_EX_ETMX_OSC_FREQ H1:IOP-SUS_EX_ETMX_OSC_SINGAIN H1:IOP-SUS_EX_ETMX_OSC_TRAMP H1:IOP-SUS_EX_TMSX_DACKILL_PANIC H1:IOP-SUS_EX_TMSX_OSC_CLKGAIN H1:IOP-SUS_EX_TMSX_OSC_COSGAIN H1:IOP-SUS_EX_TMSX_OSC_FREQ H1:IOP-SUS_EX_TMSX_OSC_SINGAIN H1:IOP-SUS_EX_TMSX_OSC_TRAMP
Replaced the failing dust monitor in the HAM6 cleanroom. Ops will notify CC if there are additional dust problems in HAM6.
[Sheila, Kiwamu]
As a preparation for moving the IOT2L table, we have disconnected all the relevant exterior cables. The table is ready to move. The attached is a cable layout as of this morning jsut for a book-keeping purpose.
The OSEM overview screen that has been running on the top leftmost monitor in the control room has been showing the raw OSEM signals (e.g., H1:SUS-MC1_M1_OSEMINF_T1_INMON) before normalization to ±15000 counts and conversion to microns. This makes it harder to see anomalous offsets because the working positions are all over the place. Therefore I changed them to look at the OSEMINF_*_OUTPUT channels.
In userapps I edited
^/trunk/cds/h1/medm/H1CDS_SUS_OSEM_OVERVIEW.adl
and
^/trunk/cds/h1/medm/H1CDS_SUS_OSEM_LARGE_OVERVIEW.adl
with gedit to change all instances of _INMON to _OUTPUT and all instances of hoprDefault=32000 to
loprDefault=-350
hoprDefault=350
where 350 = 15000*0.0233333. With these limits the working position of each indicator should be vertical if the GAIN and OFFSET fields are set to normalize raw signals in the range 0 to ≈22-31K to exactly ±15000 (per the standard SUS procedure), and FM5 is engaged to convert to microns.
After testing the changes I committed the files.
As a follow up to Betsy's log last night, I went out to ITMX this morning to release HEPI and look at actuator gaps. Payload is almost back to full, so I would expect if everything is healthy for HEPI to be pretty much centered. This is what I found, BUT... the vertical stops were all loose, meaning the platform had moved up some. I've also looked at IPS trends and they don't look horrible, reasonable shifts considering I locked with the loops on, a lot of payload came off then back on and we are still light some payload.So, a couple thoughts on what could have happened. - Basically nothing. The error Jason found is all somehow in SUS. Seems unlikely. - Some incredibly lucky/unlucky combination of horrible shifts. SUS removed a lot of payload, then pushed up on the platform a lot when they added back. I didn't get a really hard lock on HEPI because I was trying to preserve the aligned position, and it's really hard to reach all of the stops necessary. This means the platform could have moved up, moved the actuators in their mounts (if SUS pushed REALLY hard, seems unlikely) and somehow we have come back down just the right amount for HEPI to look more or less ok. I would expect that if we had come up enough to move the actuators 6mm (presumably when we removed payload or when SUS pushed on the platform with their arm), the platform would come back down and the HEPI actuators would be bottomed out. That's not what I found, so I don't know what's happening here. Anyway, if Jason finds we are still 3 mm high, it means completely re-doing HEPI at that chamber. We should also re-check the level of the ISI at this point. Will probably also require re-doing some tests on HEPI, that we wouldn't otherwise do.
Travis helped me look at the level of the optical table yesterday, and we found the table to be level to within ~.1mm. The cross-hair of the optical level never moved out of the etched line on the ruler as Travis moved the target around, and these lines are <.1mm across. I would take this to be another point indicating that HEPI probably didn't move, it just seems too unlikely that HEPI would move purely vertically.
I and Dan replaced the bad UL BOSEM unit (SN of bobbin part of that assy is SN250, D0601106-C) with a good one (SN282) pulled out of spare "half-assembled" tip-tilt assy (base plate SN 034).
We also replaced UR one (SN258) with a spare (SN134) that was pulled out of the same half-assembled TT assy simply because we were not sure if the open voltage of SN258 (about 20000 counts) was too small. Later it turns out that 20k counts open voltage is not abnormal.
The newly installed units were of course assembled in the past but without fit check, and it turns out that the gap around the connector was non-existent and I had to loosen some screws and shift things around to make a good gap. I also used aluminum foil shim trick.
After this, we centered BOSEMs for all Tip-tilts to half the open voltage.
| UL | LL | UR | LR | |
| OM1 | -16k | -12k | -16k | -13k |
| OM2 | -11k | -11.5k | -15.5k | -16k |
| OM3 | -16k | -14k | -16k | -11.5k |
WFS DC, AS_C QPD, OMCR QPDs, OMC QPDs and OMC DCPDs all responded to flash light.
Beam diverters moved back and forth.
Picomotors moved. On cable #234, the first, the second and the third channels correspond to WFSA, WFSB and AS_C picomotors. On cable #235, the first channel is the downstream 2" mirror for the QPD sled, the second the upstream 1" steering.
Checked ground loops from outside the chamber, and all cables including SUS were good except beam diverters (we know that they ground inside the chamber) and OMC QPDs (shield grounted to the DCPD signal ground) and OMC PZTs (same as OMC QPDs).
OMC PZT cable shielding also is grounded to DCPD signal ground.
Same as OMC QPDs. It's not clear from D1300376 (OMC PZT cable document) but there seems to be continuity from the shield to the mighty mouse connector shell, which is mounted on the aluminum bracket on the OMC.
LLO alog explaining these: https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=10121
As of now, ISI is locked. OMC is free.
Beam diverter cable sheild needs to be cut at the rack or at the chamber.
With the cables disconnected from the remote rack Beckhoff motor driver module, there's continuity between the cable shell and the rack. Relevant cables are cable #316 and #317.
PZT capacitance:
From the outside of the chamber, used a short DB25 and a break out board to check that PZT pins are not short circuited to stupid things. Since I was able to, I also measured the capacitance.
Pin1-14: 474nF.
Pin2-15: 428nF.
These of course include the in-vac cables and short DB25 cable I used outside.
Sounds the correct range for the PZTs. (spec: 470nF)
Correction: Corey found that the S/N of the pulled and newly put in BOSEMs are swapped in the above entry.
Bad BOSEM that has one PD pin grounded to the coil bobbin part is SN282.
| Pulled | Newly installed | |
| UL | SN282, broken | SN250 |
| UR | SN134, turns out that nothing was wrong. | SN258 |
Thanks to the efforts of SUS I was able to get in and look at the ring heaters of ITMy today. There are no apparent problems with breakage of either the glass formers or the macor retaining pieces. However, the center macor piece (D1002545) looks to have wandered off center quite significantly. I didn't have any pictures from that angle while the quad structure was still in chamber. So, unfortunately, I am unable to determine when it wandered off, but it definitely warrants looking at ITMx closely before it leaves BSC 3 if possible. It should be noted that this is the older style of ring heater, but the macor element standoff is the same throughout all but the most recent version.
As requested a picture with a few labels, showing how the macor has wandered off the center point where it should be.
The old ring heaters on ITMy have been removed from the old quad structure. While I was packaging the upper and lower ring heater I noticed quite a bit of particulate coming out. Looks like glass, certainly warrants a closer inspection.
