Ring Heater screen

• I made the ring graphics go red when Measure Power is >0.1 instead of Set Power !=0  to avoid the confusion when there is no power fed to the ring heater.

Ops Overview:

• Added graphics that tell you when a ring heater is on. Still no warning for unequal power between the top and the bottom ring heater (Maybe TJ could make Guardian scream?)
• Added (chiller) flow alarm, laser status, and laser power for both ITMX and ITMY.
• Flow alarm tripped will cause the CO2 laser to shutdown afterward. The chillers are on the mezzanine in mechanical area. If I'm not around the operator on shift should go check on them as soon as possible especially during the science run and CO2 laser is being used.
• Laser power notifications will go red when the CO2 laser power is < 50W
• TCS buttons now lead you straight to CO2 laser medm screen. Red color means the CO2 laser is not ready (ITMY should stay red for another while)

Bubba  Gerardo 

We moved 3 clean rooms, several tables, and miscellaneous items left in clean rooms and on tables from HAM 6 area to a location in front of the Hi-Bay.

 We now have access for the east door to be installed and with a few strategic crane/fork lift moves, the south door will be ready to install.

 The garbing room remains powered up and in the same position as this week until the south door is ready for install, therefore travel on the south side of H-1 output is still restricted.

The main installation activity today is closing out HAM6 work.  In parallel a couple of tasks went on:  (1)  Balancing the ISI & (2) Retrofitting top glass plate so it can be installed. 

HAM6 work is done in the chamber.  The day ended with prep work (moving cleanrooms) so the doors can be installed on HAM6 on Monday.  Before HAM6 is closed, the Signature Approval for Chamber Closure  will need to be filled out (E1500273).

LVEA was transitioned to Laser SAFE this morning.

Day's Activities:

• 8:30:  ETMx & ETMy charge measurements (Leonid)
• 9:00  Install a PCal Chassis at EX (Sudarshan)
• 9:15:  HAM6ISI balancing beginning (Hugh & Greg)
• 9:30:  OMC glass retrofit (Matt)
• 9:30:  Grabbing AUX Cart from EY and bringing back to LVEA (Gerardo)
• 10:03:  Cable swap for Low Noise ESD at EY to clear negatively-railed signals (Richard, TJ)
• 10:05-11:15:  Troubleshooting PEM channels in LVEA (Jordan)
• 12:55:  Pepsi truck
• 1:43:  HAM6 in-vac work complete (OMC work done, ISI balanced, and SUS's given clean bill of health)
• 2:10:  Final checks/inspection inside HAM6 (Hugh)
• 2:15:  Ring Heater check (Nutsinee)
• 3:00:  Bubba giving Rebolt a tour of piers/pylons/places to grout.

FRS is now linked from the CDS home page.

I noticed this morning (through the Detchar pages, very sad that last nights SEI data isn't available) that the HAM5 ISI has not been doing well since about the time HAM6 vent activities started. Sadly this casts some doubt on the feedforward data I posted the other day, so I re-evaluated the performance at HAM4 while I was digging into HAM5. My first image shows the difference between HAM's 4 & 5 in the Y direction, all the other DOFs look similar. Second image shows the rotational dof's of HEPI L4C's on the two chambers, and HAM5 sees al lot more motion than HAM4 (dashed lines are HAM5, solid are HAM4). The translations are messier, (third image) but still seem to indicate more motion at HAM5. Hugh reports finding a few mechanical contacts at the chamber while he was working on HAM6, so I'll wait to panic about HAM5 until after that mess is cleaned up. Jeff is filing a report with FRS on this.

On to doing a better evaluation of RY feedforward on HAM'S : the fourth image shows the healthy HAM4 RY feed forward, dashed lines are off, solid are on. Fifth image shows that turning RY FF on has not spoiled the X performance.

Last two images show HAM4's Y and Z feedforward performance, with the same dashed/solid off/on convention.

Jeff, Dave, Jonathan, Ryan:

Jeff K noted that the FRS web service was inaccessible from LHO CDS workstations this afternoon. We raised this as FRS-3241. Jonathan H and Ryan B did some analysis on the problem and suspect it is an issue with LLO DNS when clients use  root-DNS. I opened a LLO GC fault ticket  FRS-3242 and closed out FRS-3241 Until a fix has been implemented, I have reconfigured the internal CDS DNS server to resolve the fed.ligo-la.caltech.edu address internally. This is just a short term fix.

With purge on and both door covers open 2' outside of -Y door plane:  Dust counts all zeros!

While Matt was prepping to cut glass, Greg & I did the major rebalance of the ISI.

After Matt got the modified OMC shroud pieces reinstalled, Greg and I completed the ISI rebalance--I'll detail next.

Just before recovering the openings, -X of South Door:

100/0/100/0/200/100 counts for 0.3/0.5/0.7/1.0/2/5/ particals

Got the covers secured and free of the Optical Table with the purge turned down.  Jim made quick TFs (will log seperately) and they look fine.

Dan took over next and reports the OMC is still in good shape.

I've completed a thorough visual inspection and as-built of the new mass layout.

Thanks to GregG who spend nearly four hours in chamber.

Our new tables for the computer users room were installed today. This required the power cycling of several CDS workstations.

Matt H, Bubba G, Greg G, Jeff B, Calum T (remotely), Eddie Sanchez (remotely)

If you remember from yesterday with all the glass pieces of the OMC shroud in we had a cable interference with the shroud (see pic 2424).
 After playing with the cables the decision was made to pull the two interfering panels out so that the cables would hang free (see pic 2431). This however leaves the to now open and exposed (pic 2459). So after some discussion last night we decided to try to score and snap part of the black glass to stop the interference but also so that we could get the plate back in.

By looking side on (pic 2469) we could use the holes that the capture screws go in a s a guide to where the cables interfere with the black glass and how much glass we wanted to remove.

We decided to remove around 2.25 " (see plate mod pdf)...so it should hopefully look like "OMC3D" pic

With a brand new glass cutter we practiced on some test piece bits of black glass Calum had sent Betsy. The trick is to only do one 'score" with a light but even pressure, and then put the pressure over a raised surface (say a small diameter smooth rod), and then with gentle and even pressure that is spread out, push down and will get it to snap along the score.

Once happy with our technique, we went out and did it to the two real pieces. After of course the old carpenters trick of "measuring twice cutting once" :-) Worked like a charm. John W, gave us a small file (diamond tipped I think) to just gently bevel the edges a tiny bit to take off the sharp corners. That also worked really well. We then cleaned it by blowing it down with top gun, and then in area that snapped giving it a methanol rinse.

It went back in no problems at all. Its done.

Pic 2497.....before pic of one of the glass pieces to be cut

Pic 2498......after its been "modified"

Pic 2504...drying after methanol rinse. Thats the AR coated side you see

Pic 2506 & 2510.....The now complete OMC black glass shroud installed

Leonid needed the ESD for some measurments, so Corey and I reset the EX ESD the usual way (toggle H1:ISC-EXTRA_X_BO_4, then click HI on the medm). We couldn't do this with EY since it is the newer low noise ESD, but Jeff showed showed us the SUS_CUST_QUAD_BIO.adl screen and the big reset button.

This worked, kinda, but the driver was railed negative. Richard and I went down the EY to power cycle the driver and this seemed to solve the issue.

Dave Barker

The IRIG-B in EY only had 15 leap seconds set as of yesterday. I manually added an extra leap second at around 12:30 PST and set a pending leap second. Dave and I confirmed that all three operational IRIG-Bs have 16 current leap seconds as well as a leap second pending for June 30th.

Morning Meeting Notes

• SEI:  HAM6 re-balance
• Hartman:  No luck last night.  May work if have laser hazard
• HAM6:  Try to re-install top glass plates (which requires cutting some glass off of them first), then can hand over to Hugh for balancing.  Will need to transfer to Laser SAFE.
• VAC:  Need to crane cart over tube in LVEA
• Office furniture getting installed
• Outreach:  "Particle Fever" viewing with Landry/Dwyer talks on Sat.  Mike will also have a tour on Sunday

The beam tube washers are nearing completion on X2 and are currently near the X end station.

The plot shows 30 days of pt 523.

In an email conversation Norna had asked what we could do to reduce motion on the HAM's in the RX/RY dofs at 25-35 hz. This morning I took a few measurements to design a FF filter. I've taken a first pass at it and I think I have something that works. Attached spectra are of the ground STS X and GS13s in RY the first png, then both sensors in X on the second plot. The live measurements are with FF on, references are from a quiet time last night, FF off.

The third attachment is a plot from the script I used to do the filter fit. Blue is the filter, green is the ideal fit from the St0 L4C's to the ISI GS13's, red is the fit from the HEPI L4C's to the ISI. The design approach is exactly the same as I talked about in my alog 18045.