J. Kissel, D. Barker, J. Batch, A. Pele

Another harrowing day of front-end code changes. 

In summary, I've now completed and committed all the simulink / front-end model, MEDM screen, and macro file modifications for the HLTS, HSTS, and OMCS. This involved several more recompiles, reinstalls, restarts, and restores of all 10 models involved, a couple of more crashes and restarts of the DAQ, and a whole lot of eye-crossing details. The final modification -- to the OMCS front-end code -- has crashed the h1sush56 front end again (as the rest of these installs have, save h1sush2a for some reason), and almost undoubtedly because of the usual mx_stream failure. Thankfully, if did not crash the rest of the DAQ, so data taking should still hold over night.

Though I'm confident every thing I've done is legit, we should give a day to get things back up and running before we officially release everything to LLO. (Though I know they're not interested in more changes until they vent next Wednesday.)

Of note -- It was not until I got to the MC_MASTER parts today, and getting some feedback from ISC folks that I realized -- for calibrated, interferometric control channel purposes (think IMC_X, PRCL, SRCL, MICH, DARM) -- we need to send out the output of each LOCK filter bank (including the top stage) to the top level to be sent over IPC to the OAF / Calibration model. For those SUS that aren't involved in global control, we'll just terminate the unused connections at the *top-level* of each model (currently only h1susmc2 is *actually* using this type of spigot to form IMC_X, the remaining IFO DOFs' control signals are pulled out for calibration in the LSC model). There are a couple of ways to do the calibrated channel thing; I'll bring up with ISC / Systems as to how we want to do it (because it's currently inconsistent across the ISC / IO models). Unfortunately, this means I've gotta go back to the QUADs and BSFM, but I'll wait for the discussion to conclude before I do so.

Next on the chopping block -- tackle the severe upgrades and merging needed on the HAUX / HTTS models. Then that finally, finally, OMG finally, will close out this gosh darn ECR. Then we can do it all over again with the watchdog modifications. #facepalm.

Scott Shankle, Nichole Washington

Cleanroom in LVEA West Bay has been staged for assembly of OFI for H1 and L1. Two tables will be moved into cleanroom via Jodi. Laminated drawings, assembly instructions and parts are in bins curbside cleanroom. All parts curbside placed in ICS storage-6963. Additional parts to be wrapped at the VPW. An OMC/OFI structure and braces are located in receiving. The OFI blades and small electropolished parts are located in Thomas Vo's office. The structure, braces, blades and small parts require transport to VPW for Class A cleaning.

Mike Vargas is shipping all clean parts, hardware, tooling and tools currently at LLO to LHO.

 

I noted that when installing the black glass in HAM 3 that there was no plan to have a BG plate on AROM RH7 which was added after the black glass plan was made. We elected to use a spare BG plate from AROM RH5 and install it on this optic.
I also noted that three optics (AROM RH3, ROM RH8, and ROM LH3) were attached to the HAM table with only one screw on one side of their base plates. These were originally planned to have clamping forks before the optic height was reduced do to the discrepancy with the sled and ISC bases were used. I installed three dog clamps (D1100640 v1 type 5) on these optics on the sides with missing screws.
SNs were as follows; AROM RH3: SN 14, ROM RH8: SN 15, ROM LH3: SN 16.

Joseph Gleason, Cheryl Vorvick

We've replaced the IO/ISS QPD cable with the new one provided by Peter and dressed it. I attempted to install one of the ISS PD array cables without success and will require the assistance of someone with longer arms. We've also installed irises in HAMs 2-3 in preparation for the beam re-routing. 

Last friday, Betsy and Travis added weight to the middle mass of SRM currently on the test stand, in order to center the flags with the osems cf alog 8367. A first round of TF have been taken before that, showing clean measurements. A new set have been taken monday night to assess that there's no major change. The new results are showing an excellent match with the previous ones
 

Results in attachments are described below :

(1) H1 SUS SRM M1-M1 (top mass) comparison between modeled and measured undamped transfer functions for the 6 dofs

(2) H1 SUS SRM M1-M1 comparison between modeled and measured damped transfer function for the 6 dofs

(3) H1 SUS SRM M1-M1 undamped TF comparison before and after adding weight to the middle mass

data have been commited under the svn

Came up again with this issue today :

When I  modify an aLog from a "draft" that has been saved for a certain time (not clear how long), it won't let me post, save or preview the modified alog. It will actually delete the modification if trying to do so, and go back to the original draft.

Kyle, John 

We desire to repair a "legacy" leak on the 1.33" CFF on the north side of GV6.  Our preference is to vent GV6's annulus volume and remove the flex line portion of the external piping (redundant) to this joint and just install blank flanges in place of the removed flex line -> Unfortunately, we weren't able to get GV6 to close enough to vent GV6's gate annulus volume to do this.  Even after 70 psi was applied to the top of the pneumatic piston, GV6 never indicated "RED" or "hard-closed".  Furthermore, introducing small amounts of air into the combined annulus volumes via the vent orifice of the small turbo connected to the annulus pump port resulted in PT124B and PT114B increases which verified the fact that GV6 isn't sealing when closed.  

We will discuss options tomorrow but for tonight we restored the nominal state with the exception of leaving the YBM turbo valved-in and IP5 valved-out

SUS offloading IPC receivers were left in HAM2-ISI and HAM3-ISI models.I removed those receivers and grounded the related master model inputs.

The new models are commited under the SVN:
    - h1isiham2.mdl -r6195
    - h1isiham3.mdl -r6196

Work was covered under ECR E1300578 and WP# 4180 (still open)

They will be moved in the H2 PSL on Friday, but if you want to move these before then, let me know.

Best,

Keita

SEI at EX tying up loose ends
IAS at ITMX taking a shot of position
Work on the ISS PD Array
Close GV6 for vacuum work
Move SEI storage containers to mid station
PSL crashed, brought up partially but the ref cav is not locked
Waste removal was on site
Roofers continued
Cryopump baffle needs mod

After the CPB installation and yesterday's SUS/SEI tweaks I set my equipment back up and took another look at ITMx.

• Longitudinal Error: -0.2 mm (south)
  • Tolerance: ±3.0 mm
• Lateral Error: -0.09 mm (east)
  • Tolerance: ±1.0 mm
• Veritcal Error: -0.14 mm (low)
  • Tolerance: ±1.0 mm
• Yaw: ~ +1.6 mrad (CCW)
  • Tolerance: ±50 µrad

The yaw error is only approximate, ±150 µrad or so.  Due to this large yaw error I wasn't able to get an accurate yaw measurement or a pitch measurement; getting a return beam back into the autocollimator resulted in the beam being steered off the optic.  After talking with Hugh this morning the HEPI dial indicators did not show a large yaw movement, and double checking my setup did not yield different results.  It is possible yesterday's SUS move induced the yaw error; it wouldn't take much more than pushing one side of the suspension 0.5 mm farther than the other to cause it.  Will discuss path forward with Betsy and Hugh tomorrow.

The dedicated truck carrying 2 BSC and 1 HAM ISI Storage Containers arrived this morning. Old Yeller (driven by John W.) was used for unloading. Ski, Mark H. and Kyle used two regular pallet jacks to move the containers past the first bay. The BSC containers are in the VEA and the HAM container is in the middle bay.

The bulk of the work today was concentrated at X End. After consultation with Michael, we altered our plans slightly and then proceeded. Jim Warner unlocked the ISI so that testing could continue uninterrupted.I moved all the items out of the staging space in the lower level cleanroom and then staged the welding cart and laser for removal from the VEA. Mark, Randy, Ed and Tyler started clearing the garbing area. When that work was complete, I checked dust monitors (one to the left of the chamber door, one on the floor to the right of the chamber and one handheld: dust levels were very good (highest reading was 1 count at 3 um). We opened the roll-up door, moved the ISCT from the middle bay to the VEA under the Test Stand cleanroom and checked particle counts again. Things still looked good, so we moved various items out of the VEA and closed the roll up door. Particle counts were still good. The next task was to replace the door on the east side of the chamber and that was quickly accomplished. A garbing/staging cleanroom was was flown over the beam tube along with the engine hoist in preparation for door removal early next week. The dismantling of the Test Stand cleanroom started after lunch. That gets us through #15 on a checklist of 30 items.

Sheila, Richard, Jim, Patrick, Dave

Commissioning work on the rotation stage controller caused a 24VDC power glitch to the h1psl0 IO Chassis at 10:55 local time today. The FE computer did not crash, it allowed us to log in and verify that no ADC/DAC cards were visible via the One Stop system.

We powered down the FE computer, power cycled the IO Chassis, powered up the FE computer. When the models auto started with their safe.snap epics settings restored the PSL camera images all went blank due to a shutter closure in the Diode Room. We had seen this before and now know the recovery. On the PSL_LASER MEDM screen, the "External Shutter Request" section, the "Flow sensor" must be set to OPEN by pressing the small RESET button immediately below it. Only when all the requests are GREEN can the main RESET button be pressed. At that point a reset button has to be pressed on the Beckhoff controls system. At the moment this requires someone going into the Diode Room and pressing the button on the Beckhoff PC console. We should set up remote desktop to allow this from the control room.

The safe.snap settings do not appear to be correct. Sheila burt restored ISS, FSS and PMC from 23:00 27th Oct and the upper right video image came to life (PMC refl). But the PMC is not currently locking.

The compilation of the TCS Beckhoff code was giving some warnings and needed to be cleaned up. This is done now.

Scott S, Nicole W, Gerardo M, Randy (Apollo, Mitchell R

Yesterday the ITMX MCPB was installed just before lunch. This baffle was slightly larger in diameter than previous assemblies causing a difficult install. The larger diameter necessitated a modification to the lower copper plate D1100821 which is part of the eddy current damper. The range of adjustment allowable by the slots was insufficient for proper spacing on the eddy current damper. The work around is to lengthen the slot. The two lower copper plates needed for this baffle will be modified clean and installed once the parts are available. The remaining parts will be modified and re-classed. The lack of sufficient travel on lower copper plate was also an issue for both ITM's at LLO although modification was not needed. 

Found h1sush34 frozen following an attempt at restarting user models (yesterday evening).  This caused mx-stream issues which affected most front-ends in the corner station.  I removed h1sush34 from the dolphin network and power cycled it. As soon as the computer restarted, the mx-stream errors went away.  

Following this, several models had a 0x2000 status left over from installation of modified models, so I restarted the DAQ (at 9:01 PST).

Greg Grabeel, Thomas Vo

We spent the afternoon yesterday installing the fixture for the TCS steering mirror in BSC3.  It was a pretty tight fit but we got all the parts in there, I dropped one class A washer under the floor plate.

Attached is a plot of the round trip delay times of EPICS PULL (active read) EPICS PUSH (active write) and EPICS PUSH/PULL (active write to 3rd channel, followed by active read from that channel).

PUSH and PUSH/PULL are dominated by a 2Hz update cycle. PULL sees a 8Hz update cycle.

The minimum delay for PUSH is around 110msec, for PULL and PUSH/PULL it is about twice that.

The delay for all three channels is about 10x too slow to be really useful (i.e. for acknowledgment returns shorter than the blink of an eye.)

As for the HSTSs, I took a spectra of PR3 from Monday. The isolation and damping loops of the ISI were closed (isolation level 3), as well as the damping loops of the suspension. The chamber was still under vacuum. Status of HEPI needs to be double checked.

The attached plot compares the spectra of LHO and LLO PR3, in a similar configuration (ISI isolated, SUS damped), for the 3 levels (M1 M2 and M3) and every degree of freedom.

Looking at the plots, we can see that LLO get more isolation at each level, even though we are using the same damping filters. That said, Jeff discovered that the suspension medm gains are set to different values, (higher values at LLO) which would explain why the resonnances of the suspension are more damped there. Other than this, spectra is very close to sensor noise. The larger signal between 0.1Hz and 1Hz is highly due to ground motion (I quickly took a spectra of the streckeisen sitting next to HAM2 chamber,  which shows the same shape around 0.1Hz) More details to come next week.