Venting vertex and turbos spinning on beam manifolds

Started venting vertex this morning and spun up turbos on XBM and YBM. Looks like IP1 isn't going to make it - its isolation GV is probably leaking. The new GV on IP4 is sealing great!

Transition LVEA to Laser Safe

Peter is transitioning the LVEA to laser safe.

SR3 ROC Heater: Trouble closing OMC angular loops

Dan B, Terra H. Alexei C., Seb N,  TVo

We attempted to try to characterize the SR3 RoC heater's modematching range by mode scanning the OMC.  However, we had trouble getting the OMC alignment loops to close. Even though the alignment on the QPDs using OM1 and OM2 were relatively close to the loop offsets to start, the OMC SUS would rail and push the beam off of the QPDs.  We've had this problem before but we couldn't figure out what the issue was this time around.  Although we got flashes in the OMC, the misalignment was not good enough to get a proper measurement so we'll have to try again some other time.

FYI: For the upcoming vent, we've turned off the SR3 driver and left the IMC locked with 2.5 W input.  Also, a lot of the digital cameras weren't loading for some reason, even after requesting a reboot.

IP11 + chevron baffle + GV installation @ EY

Mark D. & Tyler

The old IP11 isolation GV was removed this morning and replaced with new valve, and the first (SN1) chevron baffle was installed along with a rebuilt IP11.

IP11 was tested prior to installation. At 5000 V each channel measured ~ 2 uA.

Gerardo relocated an empty conduit attached to cable tray to clear the handle of GV actuator.

 

replacing 1" pico mirror with fixed one in OMCR path, removing OMCR components downstream of SiC dump (Sheila, Keita)

We're replaced a 1" pico high reflector and a black glass behind with non-pico version in OMCR path. PSL beam was not available so no alignment.

We removed the following components from HAM6 (refer to D1000342):

• M9. This is aforementioned 1" high reflector on left handed Siskiyou and pico with black glass behind. Pole and base plate were reused. (Non-pico Siskiyou that was used as a replacement is right-handed, not left.)
• 90:10 splitter on a Siskiyou lens mount.
• Black glass dump to receive the reflection of 90:10 splitter.
• M10, this is a 2" high reflector with picos and black glass behind.
• M11, this is a 2" 50:50 splitter without picos.
• The entire OMCR QPD sled including QPDs/cable assy (D1101654, S1108061).
• In-chamber DB25-four mighty mouse cable for pico (D1000238, S1105053).

We found that the black glass dump had some fogging on one of the two panels. Photos to follow.

X-Y beam manifold pump down

Pumped down XBM & YBM for eight hours today. Pressures got down to ~ 2 Torr. Both are valved out from QDP80s (10" valve, safety valve, and o-ring valve all closed). We will resume pump down tomorrow and spin up turbos.

ETMY Closeout, again.

This afternoon, Travis and I pulled the First Contact on the ETMY HR surface.  WE measured charge via the standard procedure at the back of the AERM before and after.  We had a hard time blowing with 10-20psi DI N2 to reduce the charge originally at ~12V to under 3V.  More detail on this in attached alog shortly.

AFter we were satisfied with the final "dis"charged state, we then set the lower earthquake stops/lock nuts on the ETMY, and pulled the ACB (arm cavity baffle) back down into it's nominal position.  I noticed however that the ACB felt like it was rubbing on something when I bounced it vertically.  Inspection revealed that one of the earthquake (EQ) stop bars D1201235 was rubbing the down tube in the roll direction.  I moved weights around on the top of the box in an attempt to free it, however I ran out of range.  Either this unit has been rubbing for a while, unnoticed, or sometime during this last few months of vent work we jostled it enough to twist something like the flexture, blade, down tube shaft, or box.  In consult with Calum and Jeff K, the consensus was to just remove this EQ stop bar since it only constrains the ACB in the less critical roll and yaw motion which have other mechanical backup restraints.  Of course removing the long bar proved difficult because it was trapped between the unit and the chamber wall.  Travis was able to convince it to come out via bending it's tip.

Will file an FRS for this to be investigated further when we have more time/people power than today's closeout mustered up.

After Jim unlocked the ISI, Travis cleared the chamber of tools/stools/CC supplies.  Note, we did not pull any of the freshly placed 3" or 1" samples in this chamber left during closeout just a few weeks ago - all CC kits had already been pulled and I could not organize to get help with this.

Travis and I have been running TFs on the main and reaction chains of ETMY and things look good.  We are good to put the door on tomorrow morning asap.  (Note, Mark D and Tyler have it hanging on the engine hosit ready to go.)

ETMY ISI tfs look ok still

I unlocked the ETMY ISI this afternoon. TFs look okay, pretty similar to my measurements in March. The stage 2 resonance (~1-2 hz) is a little hard to resolve with these tfs, but the St1 resonance (~5-7hz) is pretty clear.

Ops Day Shift Summary

 

Evacuated pump-side of 12.8" GV mounted at IP6 location/port

model restarts after IO Chassis glitching

Two recent cases where work in CER caused front end models to freeze

Monday afternoon: h1iscey

Tuesday morning: h1sush2b

In both cases restarting all the models got everything working again.

CDS maintenace summary

New h1psliss model for production ISS outer-loop chassis

Keita, Ben, Dave, Richard, Fil:

I installed a new h1psliss model which supports the production ISS outer-loop chassis. Main changes are: no need to borrow ADC channels from FSS, no need to borrow DAC channels from PMC, PD[1-80]_DC channels removed, EXC output removed (instead excitation is summed with TXY output channel digitally).

Model and DAQ were restarted at 13:30. The restart delay was due to unknown compile problems encountered when trying to disconnect the EXC output channel from the ISS part. Because this is a common part, I put in a work-around which did not change the number of output ports.

The new ADC channel layout is defined in the wiki https://cdswiki.ligo-wa.caltech.edu/wiki/H1PSLISSModelAdcDacChannels

New Beckhoff code

Daniel, Patrick, Dave:

New DAQ chan lists for ecatc1plc[2,3,4] were installed this morning. Chiller work changed PLC2,3 and SQZ work changed PLC4.

Some SDF updates are outstanding.

 

BSC3 CPS Box - Strained Connector

WP 7455

Removal of temporary cabling under work permit 7455 is now complete. We took extra precaution when pulling around feedthroughs and decided to cut the end connector to make pulling of the cables easier. One of the CPS units on BSC3 had a cable that was causing strain on the one of the board connectors. Cable was redressed to relieve strain on the connector but maybe SEI team can look at the CPS signals.

F. Clara, E. Merilh

BSC10 - ETMY Headed towards closeout, again

This morning, Travis and I checked the ETMY suspension health and then made the pitch adjustments needed to compensate for the addition of the AMD devices to the front of the mass last week.  Like what was reported at LLO, roughly 200 uRad (up) of realignment was needed to recenter on the optical lever.  A few rounds of TFs showed that the suspension was still free of mechanical interferences, and OSEM speed dials looked good.

We then locked the test mass, swung the ACB back, attached the First Contact spray cone, and sprayed an application of the solution to the ETMY HR.  Per procedure, we removed the cone and reinforced the edge of the applied sheet with brush-on First Contact.  It now dries until tomorrow morning.  So, no oplev or pcal beams will be of use over night.

VE intends to work on the IP port near this chamber this afternoon.