- EY: IAS, SEI, SUS, and TMS usual work. Newtonian noise accelerometer installation. h2pemeyaux crashed due to poorly installed board...then fixed.
- BSC8: SEI, SUS, COC usual work by BSC8. Viewports swapped out at BSC8. Richard sorting out cabling.
- PSL: Plumber arrived to investigate suspected leak in chiller line. Continued migration of PSL from H2 to H1
- OSB: Unusually heavy rains in the morning. Doors locked at 4:05pm

[Jenne, Jan, with much help from Rich and crew, DaveB and crew]

We have finished installing our 44 accelerometers out at End-Y.  Again, please be mindful of the cones and cables.  Everything should be secure, and except for the cones which are nice and bright orange, there shouldn't be any trip hazards.  

We checked the data briefly, and all of the channels look good so far.  We'll have a look at the overnight data in the morning to make sure it's all okay.  One of the Isotrons (accelerometer power / amplifier box) that we have out there doesn't have the 10x gain that the other 2 do, so we may decide to change it out if the quiet nighttime ground motion is sitting on the ADC noise.  We'll switch out the box tomorrow if necessary.  

Some photos are attached, which show most of the array.

Thanks for all the help over the past 2 weeks, and we'll be back after the One Arm Test is complete to clean up and remove the array.

Starting from

 1019424512 GPS
 == Apr 25 2012 14:28:17 PDT
 == Apr 25 2012 21:28:17 UTC

the PEM RDS frames at LHO (frame-type PEM_RDS_A6) contain the NNARRAY
channels. 

These are all H2 channels, such as H2:PEM-EY_AUX_NNARRAY_ACC_1_OUT_DQ.

These frames are written to directories under

 /archive/frames/A6/PEM_RDS/LHO

at LHO and are transferred to Caltech.

They will also be available via NDS2, which is the protocal 2 NDS server
run by LDAS at LHO, LLO, and CIT.

In total, from the above time, 748 channels matching NNARRAY were added
to the PEM RDS frames. This includes 44 that are sampled at 1024 Hz.

With this same change, I also picked up 97 new channels that match
IOP-PEM_EY_AUX, and these two channels:

H2:IOP-PEMEYAUX_DCU_ID
H2:PEM-EYAUX_DCU_ID

(Note the PEM RDS frames contains any channel that has PEM in the name,
though I have to up date the list by hand, any time the PEM channels
change names.)

We inspected several things. More pictures were taken than shown here, which are to be posted to resource space by Calum.

1. Washers that were stuck

There are four stainless washers used for TMS temporary restraint that were stuck to the aluminum bracket (see  picture). I tried to lift them all gently, and they wouldn't move at all. Might be possible to ply it off using some tool, but we agreed it's not worth the risk of flipping and flying them to break wires.

2. A cable that is not connected

There was one cable that is not connected yet, and we identified it as the ring heater cable connecting CB-3 and the vacuum feed through (F3-3C2). This is going to be taken care of later.

One thing I noticed is that the floor order for this bracket is reversed. CB-3 first floor (closest to the  ISC table) should be one of the ETMY SUS cables, and the second floor should be the ring heater according to D1101478, but in reality it was the opposite (see the second picture, the white-ish cable is for the ring heater).

It's easy to tell the difference because of the color, but I think it's still a good practice to install things as specified for future workers.

3. One of the TMS cables was brushing the HWS mirror

The cable sagged, apparently. We fixed this (see the third and the fource picture).

PSL installation team

The new diode rack is now prepared to be packed. Also, the laser diode boxes and power  supplies are moved out of the old rack, but still stored in the LVEA. The pump light fibers / communication fibers had been pulled from the H1 LDR and the H1 LAE. The spools are stored on the rail inside the LDR (see attached picture).

The gps time when the measurements began is: 1019445220
Date and time now (Pacific Time): 04-25-2012 20:13

Measurements are running on CDSWS1 in the LVEA through an ssh -X session as "controls" on Jeff G.'s laptop.

Attached are plots of dust counts > .5 microns.

The attached are transfer function measurements on the ITMY QUAD M0/R0 top masses from the night of 04/24/2012.  There are some apparent higher-frequency resonances above 50Hz.  The measurements were taken up to 50Hz with 0.1Hz resolution from 3Hz to 31Hz. From 29Hz to 51Hz, the resolution is 1Hz.  To note, the ISI had one of it's stages locked, while the other was floating.  The resonances seen in the OSEM data could be attributed to this ISI condition. This state appears to have had a significant effect particularly on the R0 Transverse DoF. The data is indicative of a locked mass that cannot swing freely. Also, the resonances are at the same three frequencies for both chains, which would suggest the ISI table is creating them.

As of tonight, the BSC 8 ISI is floating on both stages and has been balanced.

Tonight, new measurements will be run on ITMY with higher resolution above 30Hz and with the bandwidth expanded to 100Hz.  This will slightly increase the measurement time.

We got the alignment of the ALS table, including the various Hartmann wavefront sensor paths, into an almost-final state.

We discovered that one of the lenses in the TCS pickoff from the returning ALS beam was converging instead of diverging.  This has been temporarily swapped for a correct, but 1064-coated, lens from the optics lab.  A lens coated for 532nm is on its way.  With a correctly-shaped lens in the path, the beam on the HWS is now about the right size.  (A quick beamscan made us think it's a little larger than it's supposed to be; we'll let experts wrestle with it at a later date.)

After considering the periscopes for quite a while, and thinking about drilling holes in various places, we decided the most elegant solution to the ALS/HWS periscope problem was to swap the vertical periscope mounts, so we would have more screw holes to work with.  This allows us to mount the ALS periscope baseplate as intended, and kludge a HWS beam periscope below that.  Pictures attached (from my iPhone - d'oh!).

Modulo some further tweaking, the table layout and alignment should now reflect D1100607-v7.

Apollo-Mark Randy Zack Caleb & Scott

No real issues to report.  We should fuss with the bungees on the cleanroom ceiling but otherwise she slipped right out and Dale has his Springs and seats.  Everything else is ready for the recycler.  A few photos for proof.  Thanks Crew!

Jim, Cyrus, Dave

we installed the Newtonian Noise front end system at the EY end station. It is part of the aLIGO H2 system, using a spare DCU_ID.

The new machine is called h2pemeyaux. It has the IP address 10.201.0.40 and is on the H2 IPMI system.

Its IOP is called h2ioppemeyaux, dcu_id=40. The user model is h2pemeyaux, dcu_id=41 running at 2048Hz. The model reads 44 accelerometers and acquires them to the frame at 1024Hz.

Initially it was found that the duotone signal on the first ADC (chan31) was bleeding into channel 15. Relocating the second ADC to its correct PCI slot has fixed this problem. The IOChassis has a DAC card installed, but the front end does not see this card at all. The DAC card is not immediately needed for the NN project.

The channels in the DAQ are named H2:PEM-EY_AUX_NNARRAY_ACC_n_OUT_DQ when n is in the range 1..44

After a transition to partial mode (not writing frames) and back it was found that h2fw0 was creating corrupt data frames. The transition was made to support LDAS QFS disk reconfiguration.

So data written by h2fw0 and served by h2nds0 in the following time period is corrupt. You should use h2nds1 to serve data in this time period

start:
4/24 22:21UTC 3:22pm local
end:
4/25 17:25UTC 10:25am local

We (CDS and LDAS) are investigating what happened. We will put in checking software to alarm if this happens again.

The new 5/16 bolts worked well with the adaptor plate, and the optic was removed from the chamber.  The optic was wrapped and secured on the Straddle Lift, and the Straddle Lift was lowered to it's lowest level, for transporting the optic to the optics lab. 

FYI: the class-B hardware for lifting the "lift table" in and out of the chamber, was installed in a way that didn't make sense to me, and others agreed, so we reworked the hardware configuration for lifting the lift table - picture will be attached.

Cyrus, Jim B., Dave B.

Beginning Monday (and finishing Tuesday), we cut over to the new CDS core switch.  From the network perspective, this is the last major central change required to support both H1 and H2 installation and is the foundation for implementing everything else remaining.  What is left is to install are the new edge switches that support the vacuum and auxiliary systems, which will likely happen in the coming weeks/months.

The initial cut over took about an hour, and we used the remaining time to clean up cabling and the configurations of the switches that will remain in the near and long term, and to perform testing.  The 'old' cdsnat0 and cdsnat1 have been decommissioned.  cdsnat0 has been replaced by rtr-msr-nat0, which is a PC running the Vyatta open source router system.  It handles the NAT functionality for the CDS control network, and the port forwarding for the limited CDS services available to the open internet.  The functionality of cdsnat1 (which never actually performed any NAT...) in routing between the internal CDS subnets is now provided directly by the Layer 3 core switch, a Cisco Catalyst 4503E/Sup7e.  The core switch also handles forwarding the udp broadcasts from the ops network to the front end network for diaggui/dtt testpoint discovery on port 5355.  Attached to the core switch are all the edge switches that support, for example, the H1 and H2 FE networks, the Ops network, and (for now) what remains of the legacy iLIGO Foundry equipment (running the vacuum and FMCS networks).

Unmounted ldas-h2-frames yesterday afternoon from all LDAS systems (gateway, lhoarchive, qfs-nfs1) and CDS h2gw0.  Explicitly enabled the 'writer' mount option on h2gw0 to avoid caching, replacing the following line in /etc/vfstab:
ldas-h2-frames                  -               /ldas-h2-frames          samfs   -       yes     -
with:
ldas-h2-frames                  -               /ldas-h2-frames          samfs   -       yes     writer

Per the man page,

# man mount_samfs
...
writer    Sets the file system to type writer.  There can be
               only one host system that has the file system
               mounted with the writer option at any one time.
               If writer is specified, files are flushed to disk
               at close and directories are always written
               through to disk.  The option atime = 1 is set for
               writer.

               Prior to the 4.0 release, the writer option was
               specified as the shared_writer option.  The older
               syntax is supported for backward compatibility.

The mount options on all LDAS systems were left unchanged:

ldas-h2-frames                  -               /dcs-h2-frames          samfs   -       yes     reader

The filesystem was then remounted and NFS-shared out, first on h2gw0, then on the LDAS QFS readers.

The LDAS systems have not logged any more 'Bad directory validation errors' relating to ldas-h2-frames since the change.  There have been warnings pertaining to cds-h2-frames:

qfs-nfs1:~ # dmesg
...
Apr 25 08:28:35 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 08:28:35 qfs-nfs1 last message repeated 3 times
Apr 25 08:55:10 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 08:55:34 qfs-nfs1 last message repeated 7 times
Apr 25 09:19:34 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 09:20:03 qfs-nfs1 last message repeated 7 times
Apr 25 09:44:05 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 09:44:33 qfs-nfs1 last message repeated 7 times
Apr 25 10:09:03 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 10:09:03 qfs-nfs1 last message repeated 3 times
Apr 25 10:35:36 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 10:36:03 qfs-nfs1 last message repeated 7 times
Apr 25 11:00:05 qfs-nfs1 samfs: [ID 756621 kern.warning] WARNING: SAM-QFS: cds-h2-frames: inode 0x2bdbf has a Bad directory validation error
Apr 25 11:00:34 qfs-nfs1 last message repeated 7 times

The 'writer' mount option was added to /etc/vfstab on h2gw1 yesterday as well, but that filesystem has not been remounted and thus the change has not yet taken effect.

• Pitch: 7.5 µrad down
• Yaw: 87 µrad CCW

These are within our spec for mechanical alignment adjustments (±160 µrad pitch/yaw), therefore IAS is now done at BSC08 and will begin to transition to BSC06 this afternoon.

I went back into BSC8 this morning to fix the ISI's weight problem. Ended up bolting 7 of SUS's dog clamps at various points around the optical table, mostly around the top of the quad. I tried to be careful to not to pinch any cables or interfere with any moving parts. We may not be exactly back to where we were ~2 months ago, but everything is back into spec, or at least as close as we can get. IAS is in now taking final measurements.

Measurements on the M0 & R0 masses are being run on H2 SUS ITMY.  The estimated completion time is ~4:00 AM PST.

Today:
With Jason on the IAS EQ, I finished the fine alignment of the ITMy chains in pitch and yaw. This required knocking the reaction chain top stage blades to swing it into yaw tolerance.  Jason will likely post numbers tomorrow.

With Garcia, I centered up all 20 OSEMs. 

Closed the ring heater.

Finished adding the test mass EQ stops and brackets.

Handed off the SEI to unlock the ISI.

Garcia may run a TF overnight to make sure we're not rubbing anywhere.  Tomorrow, after SEI finishes fussing about their minor weight issue (ehem), Jason will take a final look at the fully floating SEI/SUS BSC8 assembly for any last minute alignment tweeks.

PSL installation team


pulled back the pump light fibers from LAE to Diode room and disassembled them from the diode boxes. They are coiled now and ready to be put into the new rail between the H1 LDR and the H1 LAE.

Moved cables and electronics from the H2 racks next to the H2 LAE to the H1 racks

Installed the PSL water manifold underneath the (new) optical table. The manifold for the "table water" (powermeters, etc.) is not installed yet, because the CPC connectors are not self-sealing (so they are leaking, if nothing is connected to them). Also, the pressure valve for this circuit needs to be mounted to the new filter cartridges.

Since laser diode rack is not going to be moved in one piece, we started to get the shelves into the new laser diode rack (to be continued).