Morning Status

TITLE: 05/18 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 14mph Gusts, 10mph 5min avg
    Primary useism: 0.07 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY:

Quiet morning thus far with technical cleaning team only activity in LVEA.  Ran through the morning items from Ops Checksheet (only items of note were:  OPO was tripped, so untripped watchdog.  Dust Monitor Check looks "OK".  Dust monitor alarm at HAM5 (prob due to cleaning), HEPI EX diff pressure is INVALID.  Vacuum has lots of (usual?) alarms.)

Turbo pump pumping CP4 tripped off

(Chandra R, Gerardo M)

The turbo pump pumping CP4 tripped off this afternoon, the turbo controller was off and the scroll pump backing the turbo was on, but isolated. 

The following was done to restart the system: The turbo was isolated via its manual valve as a precaution, then the turbo was restarted, it reached full RPMs, after reaching normal running condition the backing pump was valved in.

After 1 hour the system seems to be OK.  Pressure is now at 1.40x10^-08 torr.

Something to note, we need a lower alarm setpoint for H0:VAC-MY_Y4_PT245B_PRESS_TORR, by the time I received the first text alarm (00:24 utc while I was at the site) we were at 5x10^-05 torr.

It is not understood why the turbo tripped, but we'll look into it.

CP4 turbo tripped

Around 4:30 pm local time the turbo pump on CP4 tripped for unknown reason. Coincidentally EY chiller pump tripped around the same time. Unfortunately a portion of the foreline (upstream of safety valve) back streamed through the turbo. Thankfully Gerardo was still on site and rushed to MY to turn it back on. But unfortunately the RGA was valved in. We will take a scan tomorrow to assess and then install the small IP at bottom of CP and reconnect the cold cathode gauge so we can leave the turbo valved out. Pressure currently at 2e-8 Torr.

Corner Station Purge Air

Measured dew point for the corner station purge air this afternoon 00:15 utc, value at -37.6 ^oC.

HAM6 SUS Ground Checks

Ground loops for HAM6 suspensions completed. Looked at OMC, ZM1, and VOPO. Found short on ZM1 pin 2 shorted to chamber ground.

AMD #3 and #4 installed on ETMX Test Mass - Final set for H1!

Slawek, Sebastien, Travis

After the usual fussing (care) by a perfectionist team, the last AMDs were successfully glued to the flats of the ETMX test mass!  Well done guys!  

The tooling will be removed tomorrow mid-afternoon.

All 4 H1 test masses now have AMDs installed (4 each).

I'll state again that I'm impressed by how easy the tooling is for this in-situ install and how issue-free the process was.

 

Relief Valve at X-End Purge Air Skid

Replaced worn out relief valve on air compressor #4 for the purge air skid at X-End station.

X-End Purge Air Skid

Replaced burned out indicator lights on the purge air skid at the X-End station.

Ops Day Shift Summary

New Light Piping Installed For SQZT6

(Corey, Daniel) 3:00 - 3:40pm

Installed (qty2) light piping  for the two beam paths coming out of HAM6.  The Viewport Cover/Guillotine was in place for both and the plastic Guillotine is also in place & will need to be removed when people want to work on beams for this table.  This completes WP#7571.

CP4 bake results

We are declaring victory on CP4 bake at MY! Rai Weiss and Dennis Coyne gave it their blessing. :)

Attached is a spreadsheet with RGA scans showing partial pressures of residual gases. Total pressure = 2.4e-9 Torr for the post bake scan. LLO’s CP4 scan at their EX serves as a reference/baseline (coincidentally we’re both changing states of our #4 CPs). I also included a scan of our CP4 before the bake, but after the LN2 was boiled away and ice pumped away (total pressure 2e-7 Torr) in Faraday mode. Not very useful, but it’s data. We baked our newly installed RGA in situ with the CP bake so we never captured a baseline.

Comparing LLO’s reference to our post-bake, the peaks relative to each other look good, expect maybe for AMUs 50-60. Note that LLO’s scan is from an SRS unit and ours is from a Pfeiffer unit. I don’t have Torr/A conversions for these units specifically. Based on VBO scans, we know that the Pfeiffer ion current correlates closer to pressure than the SRS:

Pfeiffer = 1.3 Torr/A of Ar

SRS = 367 Torr/A of Ar

I used these values to convert to Torr and included that plot as well.

We have a new peak at AMU 7. Probably from baking the old 10” CETEC valve with o-ring gate seal.

After the annulus piping is installed and GV electrical connected, we will open GV 11 first to expose the bake volume to CP3 and IP9 and collect an RGA scan and finally open GV12.

 

HAM6 ISI is good to go

CPS Z/RX/RY location residuals are all <15 micron/microradians indicating the table hasn't move much since they were last zero'd (around the time of the last closeout). Today's transfer functions (first image) look much like the Apr 26th measurements (second). I also replaced the 4" cc sample on the table earlier today. Think the chamber is good to close up.

SQZT6 Alignment

The periscopes and beams were realigned, now that SQZT6 is in its final position.All three beams travel down the periscopes and make it to the photodiodes for locking green. The CLF DC has been temporarily hooked up to a Thorlabs PD that is in the homodyne path. For reasons unknown the green transmitted beam seems even weaker than before.

Still to do:

• Install bellows between table and viewport,
• Remove the viewport protectors, and
• Retune the auto lockers.

HAM6 IFO beam profiling

Tvo, Alexei, Dan

We took some more beam profiles of the single bounce (off of ITMX) IFO beam in HAM6 as the north door is off. We took measurements from the edge of the HAM6 table near the viewport and up to OM1. At first glance it seems the astigmatism of the IFO beam is not as bad as our previous measurements. However we still need to analyze the results. We don't have the OPO beam available at the moment so we couldn't profile that, perhaps we can before the doors go back on.

As we were there we also tried to profile the beam shape change induced by the SR3 heater. We got the heater up to ~70C and took profiles with the nanoscan in a single position near the HAM5 viewport. Along with the OMC mode scan results we took the other day we are hoping this will allow us to narrow down where in the beam parameter space we are. Results to come.