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.

The X arm cryo pump spool was installed at GV 7. Before installation we discovered an I LIGO conical baffle in the spool which we removed. We also reconnected the annulus piping at GV 7.

Tested photodiodes in ITMX. Testing was done on feedthru E4-6-1, air side. 

PD forward voltage:
Pin1&2:     0.409V
Pin4&5:     0.422V
Pin7&8:     0.423V
Pin10&11:  0.423V

Filiberto Clara

Crane work at End Y – Apollo
Soft Cycle GV17 at End Y – Kyle
ZV-800 viewport installation (HAM3) – Apollo
Iluminator and camera installation (HAM3) – Jeff L./Travis
Running TF on ITMx - Betsy
Running  TF on MC1/MC2/MC3/PRM – Betsy
GV-8 soft close - Kyle
Cryo Pump reinstall on X arm in LVEA – Apollo
HAM3 ISI rebalance – Jim/Greg

Replaced Top Coil Drivers in SUS-C7 (U37, and U36) with OMC Coil Drivers. Wire Diagram D1002740 calls out for top coil drivers. New units were placed as follows in SUS-C7 Rack:
OMC Coil Driver D1100304 - S1102659 was placed in U37
OMC Coil Driver D1100304 - S1102660 was placed in U36

Filiberto Clara

I'm finishing up my last set on PRM (HAM2).  Jim is going in to start work on rebalancing the HAM3 ISI.

We need a single DOF TF on each of the optics we are cleaning next week in order to run a comparison against  "on the fly" after pulling the First Contact.  So, I am going to run a few this morning to make new references.  I'll take MC1, MC2, MC3, and PRM data.

• Pitch: 976 µrad down
  • Target: 971 µrad down (619 µrad optic pitch + 352 µrad FC correction)
  • Error: 5 µrad down
  • Tolerance: ±50 µrad

The IMs and MCs have been burtrestored to the automatically generated snap file from monday 11/11 at 20:00

Attached are 10 min trends of the IMs osem signals in the euler basis (Long/Pitch/Yaw) during alignment on monday, and today after restoring the snapfile.

picture 1 : Monday 11/11 from 19:50 to 20:00 PT

picture 2 : Today 11/14 from 10:20 to 10:30 PT

No major shift is seen when comparing both trends

J. Kissel, A. Pele

Though Arnaud had posted a few of the pictures from our B&K hammering session of ITMX in BSC3 (see LHO aLOG 8497), I post the rest here because I got more pictures that are not necessarily B&K related. I attach four .pdf albums, captioned below; along with a few of the best publicity photos attached in raw form.

2013-11-13_BSC3Cabling.pdf
-  Nothing to be alarmed by here, but I noticed that tons of cabling were draped from ST0 of ISI-ITMX to their respective feedthroughs in rather hap-hazard ways, and I was worry about potential shorting of isolation between the suspended payload of HEPI and the Chamber. I mentioned this to Jim, and he quickly assured me that the cables are still in a transient state, and will most certainly be cleaned up before the chamber is closed up. I merely post for posterity, so we (i.e. not just folks in SEI) remember what *not* to do.

2013-11-13_BnKHammering.pdf
- Just a few more pictures from the B&K hammering session, indicating where I was hitting and a few action shots. As I said, Arnaud has posted most of these already in LHO aLOG 8497.

2013-11-13_ITMXPublicityPhotos.pdf
- It's always good to get some shots that can be later used for posters and talks. Here's a fashion show of H1 SUS ITMX.

2013-11-13_IXArmCavityBaffle.pdf
- A couple of things to note here:
(1) The first two pages show just how incredibly close the ACB is to the QUAD structure as a result of the move decreed by IAS. In page two I'm trying to hold up a 3/16ths allen key up for perspective, but it didn't work out so well. I would estimate the gap at-closest-approach is no more that 5 [mm]. It just gives me the willies. Especially since I gave the ACB a few milli-Jeffs of calibrated excitation, and it started waggling with reasonably high Q at ~5-10 [Hz]. Is the fundamental resonance of this suspension really that stiff / high-in-frequency? Hurumph.
(2) This is the first time I've seen the suspension system up-close and personally, so I wanted to get some good shots of it. Very interesting design...
(3) There's still some tooling lying around on the baffle itself. We should make sure to grab these before chamber close-out.

This morning Travis, Jason and I made the ~last pitch alignment of the ETMx.  We also pulled the FC from the inside of the 2 East viewports and the ETMx CP-AR.  However, when we pulled the FC off of the CP-AR, the thin central portion of the sheet left segments of a ring around the center of the optic.  Par for the course.  And, of course, I could not get any good pictures of the feature so I'll attach a sketch shortly.  I'll get with COC to see what I should do - note, I cannot get the spray cone on to resheet the First COntact and start over, so either we'll need to live with these remnants, or I'll have to get crafty with a smaller cone.

But, back to the alignment - we aligned the ETMx to an offset pitch pointing such that when we pull the First Contact sheet from the HR surface, the optic bounces up to point the nominal pitch.  However, this does not help TMS with their alignment now.  After consult with IAS/TMS we decided to put the offset pitch onto the bias slider of the ETMx.  We have the range according to the uRad-calibrated bias slider, however Jason is going to go map it out and confirm the calibration of the slider with his optical equipment (still set up).  This should not take long, and he will leave the offset bias enabled for TMS to start their alignment asap.