I have disabled the broadcast storm control feature in the FE network ethernet switches.  I suspect the feature is dropping CA broadcast traffic when IOCs go offline, as the number of channels is significant for even one host; this will negatively impact the ability of systems to reconnect to channels when the come back up, and just extend the period of time the broadcasts are active.  There was a marked reduction in the level of dropped frames on the FE network when dc0 was changed to collect EPICS data via the OpenMX network, but there are still peaks of dropped traffic (at a reduced rate).

Koji A., Jeff B., Andres R., Jeff L.

The OMC was moved into HAM6 this morning.  The move from the cleanroom and into the chamber was smooth with no issues.  The OMC is sitting off to the North side of the ISI table to allow access for IAS.  The cookie cutter (used to position the OMC structure) is attached at the correct location on the ISI table for future use.  The structure is held with a few dog clamps.  The rest of the dog clamps, screws and washers are in a foil bag next to the structure in the chamber.

[Jeff B, Andres R, Rich A, Jeff L, Koji A]

We successfully resolved the grouding issue of the OMC preamps, thanks to the help provided from Peter K, Rick S, and Betsy B
for the necessary isulating materials. Here is the note for ourselves and someone who may work on this insulation for L1 and 3IFO.

The grounding of the ISC cables were caused by the mounting of the preamps (attached figrue, left). The PEEK washers
were used to isolate the bracket from the structure. In order to fit the wahsers, we had to trim them (only for the outer one) with crimpers.
In order to isolate the 1/4-20 screws from the hole walls, we used Kapton tubes. Since the diameter of the tube was too big
for the hole, we had to open the tube and trim it to reduce the number of turns. In addition, the metal washers should have
been removed as they sneakily caused the grounding with the preamp.

Peter King, Joe Gleason

We ran the cables coming from the ether-cat chassis into the PSL for the mechanized rotation stage and connected them to the controller box on the PSL table. We also connected the lock out mechanism cable to the box and ran that cable outside the PSL near the Light Pipe. The excess is coiled up behind the cooling pipes under the light pipe area and needs to have the lock out device attached and the box mounted to the wall. Once the lock out box is attached and mounted the stage can be tested and installed in the beam path with the HWP from the old stage. Currently the stage is sitting along side the mechanical stage on the PSL table.

After discussing the issue of an interfering table mass last week we elected to move the mass 2" in -Y to allow the PR2 scraper baffle to be installed in the correct location using the cookie cutter. There were no further issues encountered and the work is now complete. I placed the old baffle Z plate on a shelf in the clean room outside HAM2 that will need to be sent back to UF for modification.

I've run the latest security updates on the two CDS nameservers, and rebooted them this morning.

[Sheila and Kiwamu]

 The FSS wasn't locking this morning, interrupting PMC's lock. Lowering PSL-FSS_RESONANT_THRES from 0.9 to 0.5 fixed the issue. The alignment on the FSS reflection camera looked bad. It has been unclear why the FSS alignment kept drifting in pitch.

It appears to have crashed over the weekend.

There was an earthquake close by this morning at 06:47. SUS IOP watchdogs did not trip, looks like it was all over in less than a minute.

The plot is 10 minutes of second trends, starting at 06:40.

Changed the /opt/rtcds/userapps/etc/userapps-user-env.sh file to a new copy checked out from the userapps repository.  The new configuration includes paths added to support the userapps repository changes made Nov. 15.  

Changed the /opt/rtcds/userapps/etc/userapps-user-env.sh file to a new copy checked out from the userapps repository.  The new configuration includes paths added to support the userapps repository changes made Nov. 15.  

[Jeff B, Jeff L, Rich A, Koji A]

On Friday, we looked at OMCS for the preparation of the installtion after the TF approval in the late afternoon.

- Dog clamps, 12pt screws, the cookie cutter, and its screws were prepared.

- The genie lift was moved near HAM6

- We looked at the cable routing. The quadrapus cables are too long & we have three unused connectors.
  They will be tacked on the OMCS structure.

- The isolation between the cable shields and the suspension structure was checked. We found that the
  shield of the OMC ISC cables are shorted to the suspension structure. The DCPD preamp housings
  (made of AL) are directly attached on the structure. (The situation is the same for the LLO OMC too.)
  We can't isolate the preamp right now unless we have some special PEEK components
  such as PEEK 1/4-20 screws or PEEK shoulder washers for 1/4-20. We have CLASS A, C&Bed Kapton
  sheets, which may be useful.

  On Monday morning, we continue to work on the cable routing while the remedy for the preamp isolation will also be explored.

With help from CherylV, JoeG, VolkerQ, OlliP, PeterK et al., we completed the installation of the H1 PSL ISS 2nd loop PD array in HAM2 yesterday afternoon.

This array was fabricated and aligned by OlliP, PeterK, RichA, and CalumT at CIT, then shipped to LHO and set up in the H2 laser area enclosure for further testing of sensitivity to pointing fluctuations and final alignment.

An updated method for quantifying the pointing sensitivity and executing the final alignment was developed and is documented in T1300925 which will be posted to the DCC shortly.  Also, the performance of this array is captured in the test report, E1300863, which should also be posted to the DCC shortly.

The installation went relatively smoothly after recovering from compiling issues after the update of the RCG code on Tuesday (thanks to Arnaud and Jeff for help with the suspensions).  The DC voltage levels seem to indicate that the PD positioning was somewhat compromised compared with what was achieved in the H2 Laser Area Enclosure before transporting, installing and connecting cables.  I suspect that the forces involved in connecting the cables and the weight of the cables is responsible for movement of some of the PDs.

All eight array PDs and the QPD checked out electrically and with laser or flashlight light.

The measured DC levels after installation and alignment (viewed from the back - terminal side of PDs) were:
Upper Left:   415 mV
Upper Middle Left: 475 mV
Upper Middle Right: 470 mV
Upper Right: 365 mV
Lower Left: 395 mV
Lower Middle Left: 67 mV
Lower Middle Right: 565 mV
Lower Right: 554 mV

Pre-installation measurements are summarized in the attached plots.

Alexa, Rich

Detectors ASC_AS-A and ASC_AS-B have been installed and roughly placed on the optical table in HAM6.  A quick RF checkout has confirmed that they are both working as expected.  Here are the details for each:

ASC_AS-A
Detector Serial Number:S1300634
Quadrants 2 and 3 are served by a 106 inch in-vacuum 5-way coaxial cable serial number S1301449, which connects to vacuum flange D5, subflange 2D1.  This connects to air side cable 28
Quadrants 1 and 4 are served by a 106 inch in-vacuum 5-way coaxial cable serial number S1301453, which connects to vacuum flange D5, subflange 2D2.  This connects to air side cable 29
The DC power is supplied to this head by a 180 inch, 25 pin D-sub cable serial number S1106833

ASC_AS-B
Detector Serial Number:S1300635
Quadrants 2 and 3 are served by a 106 inch in-vacuum 5-way coaxial cable serial number S1301448, which connects to vacuum flange D5, subflange 1D1.  This connects to air side cable 26
Quadrants 1 and 4 are served by a 106 inch in-vacuum 5-way coaxial cable serial number S1301451, which connects to vacuum flange D5, subflange 1D2.  This connects to air side cable 27
The DC power is supplied to this head by a 180 inch, 25 pin D-sub cable serial number S1106835

Further data will be taken on the transfer functions and specifics

Daniel S., Patrick T.

Daniel found the Beckhoff chassis in the CER for the IOO rotation stage switched off. We also found the cabling from it disconnected from the rotation stage interface box at our test set-up by the H1 PSL electronics racks. It looked like the cables were moved into the H1 PSL enclosure. We disconnected these cables from the chassis in the CER (to be safe, because we don't know the state of them at the other end) and switched the chassis back on.

As we left it, the Beckhoff chassis is on with the IOO rotation stage cables disconnected from it.

J. Kissel, F. Clara, R. McCarthy, R. Abbott, S. Aston

After discovering (last night) that the H1 OMCS transfer functions revealed an excess DC gain of 5.5, Stuart, Richard, and Filiberto identified that an incorrect breed of TOP driver for the OMCS, which was a result of an incorrect wiring diagram. Fil has now swapped in the correct driver, and I've taken transfer functions. I've finished taking all Phase 2b measurements, but not yet processed them all (aLOG to come); I post the raw transfer function data here which has the comparison to the previous measurement (and shows the coherence), just to prove the point and demonstrate victory.


Of interesting note -- the OMCS TOP Driver (D1100304) has a lower transconductance, 2.026 [mA/V], that a Triple Top Driver (D1001242), 11.919 [mA/V]. Therefore, the "incorrect", Triple Top set of transfer functions have better SNR / coherence than the "correct" OMC TOP transfer functions. Who thought hard enough about the OMCS that they calculated the DAC / coil driver noise, which then convinced them to create a whole new, annoyingly different, driver type? I certainly have not seen any such design discussion. R Abbott hasn't either. This applies for the TMTS as well, which also has its own TOP driver. Hurumph.

[ChrisW, Zach]

The OMC model has been genericized and exported to LHO from LLO. Here is a summary of what was done:

• Following a change in the directory structure, the l1omc.mdl and associated files were moved from lsc/l1 to omc/l1
• A library part was created for the OMC model (located in omc/common/models/omc.mdl) and l1omc.mdl now links to this
• An h1omc.mdl was created by H1-ifying l1omc.mdl
• Screens and scripts have been genericized and put in omc/common/medm and omc/common/scripts, respectively
• An L1OMC.txt foton file was committed to the SVN in omc/l1/filterfiles/. It can be copied to omc/h1/filterfiles and renamed when this is desired.
• An h1omc safe.snap was generated from an L1 snap. It is in omc/h1/burtfiles. This should be loaded manually with burtgooey, then makeSafeBackup should be used to create an initial local snap with the appropriate soft links, etc..

All the above is committed to the SVN and has been checked out at LHO.

As I understand, there is an RCG build directory issue that is currently preventing installation, but that should be cleared up shortly.

HugoP ,GregG, JimW

Following the rebalance of HAM3 this afternoon, TFs are now running on HAM3 and ITMX ISIs. Should be done early tomorrow.

Alastair H. Greg G. Robert S. Thomas V.

We were able to complete the alignment of this set of mirrors tonight. One of the 10-24 vented SHCS on the back of the SM2 mirror in BSC2 got bound up and broke at the head but we decided to move forward with the installation and were able to get the mirror secured.  Although all the bolts are tightened down to their capacity on both mirrors, the alignment is still vulnerable to being bumped.