[Aidan,TJ,Nutsinee]

Following the HWSY lens replacement during last week's mini-vent, we have been working to recover the alignment of both HWS beams. Without the ALS beams, this is accomplished using the more laborious method of injecting the HWS beams into the vacuum system, close to centered on the in-vacuum lens, and swinging SR3 around in PITCH and YAW. The return power on the HWS CCDs is plotted as a function of position and yaw. This technique relies on the ITMs being properly aligned.

HWSX

We received no return beam from ITMX in any portion of the PIT and YAW phase space. We concluded that, given the HEPI lock down and ITMX activity last week, ITMX has not returned to the same alignment that it had before the vent. Without access to the ALS beams or the optical levers, it was difficult to make any progress on HWS alignment until the ITMX alignment is corrected. The HWSX alignment effort is on hold until ITMX is fixed.

HWSY

After locating three regions in SR3 angular phase space that held a total of four return beams, we identified which belonged to the ITMY HR surface by running a ring heater test and observing the expected thermal lens (in agreement with the online simulation).

We had to fold the HWSY layout to lengthen the distance from the last lens to the HWSY CCD such that the latter could be placed at the image plane of ITMY. We added an additional optic and moved the HWS CCD as shown in the attached images. The return beam looked much cleaner and the main BS EQ stops look much sharper (less diffraction).

The current status is that the HWSY camera is running WITHOUT the Hartmann plate installed but WITH the bandpass filter installed. The HWSY CCD is currently attached to the HWSX computer (H1HWSMSR) instead of HWSX. This is a temporary measure until the HWSY computer (H1HWSMSR1) is functioning correctly.

Before:

After:

HWSY return beam - misaligned to show the EQ stops.

WP 6639

The Beckhoff PLC code for h0vacmr was updated to match the change of the IP6 controller from a dualvac to a gamma. This required stopping and restarting the code, so there should be a gap in the data for the vacuum MR channels during this time.

The control room MEDM screens are updated except for the dedicated vacuum computer in the back of the room. I will update that one when the film crew is done.

The minute trend files were renamed to make the following changes:

Old -> New
H0:VAC-MR_IP6_EI166_A_HV_VOLTS -> H0:VAC-MR_IP6_EI166_HV_VOLTS
H0:VAC-MR_IP6_EI166_A_HV_VOLTS_ERROR -> H0:VAC-MR_IP6_EI166_HV_VOLTS_ERROR
H0:VAC-MR_IP6_EI166_A_HV_KVOLTS -> H0:VAC-MR_IP6_EI166_HV_KVOLTS
H0:VAC-MR_IP6_EI166_A_HV_KVOLTS_ERROR -> H0:VAC-MR_IP6_EI166_HV_KVOLTS_ERROR
H0:VAC-MR_IP6_II166_A_IC_VOLTS -> H0:VAC-MR_IP6_II166_IC_VOLTS
H0:VAC-MR_IP6_II166_A_IC_VOLTS_ERROR -> H0:VAC-MR_IP6_II166_IC_VOLTS_ERROR
H0:VAC-MR_IP6_VI166_A_PRESS_TORR -> H0:VAC-MR_IP6_VI166_PRESS_TORR
H0:VAC-MR_IP6_VI166_A_PRESS_TORR_ERROR -> H0:VAC-MR_IP6_VI166_PRESS_TORR_ERROR
H0:VAC-MR_IP6_CS166_A_STATUS -> H0:VAC-MR_IP6_CS166_STATUS

The following channels are no longer available through dataviewer:

H0:VAC-MR_IP6_166_STATUS
H0:VAC-MR_IP6_CS166_A_STATUS
H0:VAC-MR_IP6_CS166_B_STATUS
H0:VAC-MR_IP6_EI166_A_HV_KVOLTS
H0:VAC-MR_IP6_EI166_A_HV_KVOLTS_ERROR
H0:VAC-MR_IP6_EI166_A_HV_VOLTS
H0:VAC-MR_IP6_EI166_A_HV_VOLTS_ERROR
H0:VAC-MR_IP6_EI166_B_HV_KVOLTS
H0:VAC-MR_IP6_EI166_B_HV_KVOLTS_ERROR
H0:VAC-MR_IP6_EI166_B_HV_VOLTS
H0:VAC-MR_IP6_EI166_B_HV_VOLTS_ERROR
H0:VAC-MR_IP6_HS166A_A_START
H0:VAC-MR_IP6_HS166B_A_STOP
H0:VAC-MR_IP6_HS166C_B_START
H0:VAC-MR_IP6_HS166D_B_STOP
H0:VAC-MR_IP6_II166_A_IC_VOLTS
H0:VAC-MR_IP6_II166_A_IC_VOLTS_ERROR
H0:VAC-MR_IP6_II166_B_IC_VOLTS
H0:VAC-MR_IP6_II166_B_IC_VOLTS_ERROR
H0:VAC-MR_IP6_VI166_A_PRESS_TORR
H0:VAC-MR_IP6_VI166_A_PRESS_TORR_ERROR
H0:VAC-MR_IP6_VI166_B_PRESS_TORR
H0:VAC-MR_IP6_VI166_B_PRESS_TORR_ERROR
H0:VAC-MR_IP6_XA166_A_FAULT
H0:VAC-MR_IP6_XA166_A_FAULT_ERROR
H0:VAC-MR_IP6_XA166_B_FAULT
H0:VAC-MR_IP6_XA166_B_FAULT_ERROR

With the search for returned IMC ideal, we've reported that the SEI system puts the platforms back from whence they came (before the vent.)  Rather than just relying on our position control loops to do that, the controlled cartesian dofs and the local positional sensors were trended from before through the present after returning to pumped down condition.  This was done for both HAMs 2 & 3.

This showed that in fact the control loops are doing exactly their job--the six cartesian dofs for the HEPI and ISI platforms for both HAMs 2 & 3 have returned to the pre-vent position.  No errant reference position has corrupted the location.  Looking at the local sensors, on the ISIs with just six sensors for the 6 dofs (X Y Z RX RY & RZ), these sensors too have returned to exactly the pre-vent position.  On the HEPIs with an over-constraining 8 sensors for the six dofs, the local sensors do show small local positional shifts.  During the vent, the horizontal sensors clearly show the distortions the vacuum system but the cartesian positions while they see the disrupting air motion, remain locked in place.  Since the pringle modes of the HEPI have been removed from the locked positional control, the local sensors do lock onto a more repeated position to hold the cartesian position.  The vertical sensors of HEPI show even less shift after the vent than the horizontals.  Generally, all the local sensors on HEPI are within about 100 counts of their pre-vent count.  At 655cts/mil:  100cts = 0.000153"=3.9um.

HEPI and ISI for HAMs 2 & 3 are good.

With the vent and FMCS HVAC work can clearly see some variances on some oplevs (namely at the End Stations).  First attachment are the Oplev Pit/Yaw/Sum 7-day trends. 

NOTES: 

• ETMx Pit has nose dived down and is currently more than -30 counts. (Yaw is still within "good" range.)
• ETMy Pit has been a bit all over during the last week, but is under +/- 30counts. (Yaw is nominal.)
• SR3 has had various steps in both Pit/Yaw over the last week.  (updated edit:  This is probably due to TCS HWS work).
• BS yaw was down at -80 (!) at the beginning of the week (2nd Attachment) and returned to nominal values on Monday (5/15).  Pit has had no change & is nominal during this time.

EX Temperature Up 4-degF In Last 24hrs (5/17)!  EY Took 4-degF Step Up On Mon (5/15)  (see 3rd Attachment for 2-week temperature trend)

Apollo started controller work at EX 24hrs ago, and you can definitely see this on the ETMx oplev in Pit.  The temperature sensors (the FMCS sensor went down during this work, but you can see the temperature variances with the Dust Monitors).

EY controller looks like it's back & I chatted with Apollo person in the Control Room and they hope to have the EX controller back tomorrow-ish/possibly today.

This closes FAMIS#4728.

15:00 - 17:15 UTC

15:08 UTC Robert to LVEA to make load acoustical injections.
15:10 UTC Someone unplugged the power supply for the FMCS controller in the control room yesterday around 2:30 PM. Bubba plugged it back in. LVEA temperatures were uncontrolled.
15:33 UTC King soft water through gate to check reverse osmosis
15:45 UTC Robert turned off acoustical injections
15:38 UTC Gerardo to LVEA to move aux carts to GV1 and GV2
15:58 UTC Rush from NOVA film crew through gate
16:04 UTC Christina to mid X
16:09 UTC Karen driving to VPW
16:11 UTC Peter to LVEA to measure green light on one of the tables near HAM1
16:12 UTC Bob, part of video crew, through gate
16:17 UTC Aidan to LVEA to work by HAM4 on HWS table
16:36 UTC Peter done
16:41 UTC TJ to join Aidan in LVEA
Nova film crew setting up in control room
16:58 UTC Karen back
17:02 UTC Christina leaving mid X
17:05 UTC Betsy and Nutsinee to LVEA

We identified the return beam from the ITMY HR surface. The HWY periscope is aligned such that this is now returned to the HWS CCD. We confirmed that this is the ITMY HR reflection by running the ring heater for several hours and measuring a negative thermal lens virtually identical to the one predicted by the online simulation.

The size and shape of the reflection is consistent with what we expect and what we see at LLO. We see features such as the shadow of the earthquake stops. The beam shows evidence of a considerable amount of dust on one or more of the HWS optics which we will need to clean. Also - we've not yet placed the HWS CCD at the conjugate plane of the ITM HR surface. We will also want to look at shrinking the beam envelope size by 30% or so (by adjusting the SLED fiber launcher) to make the beam more consistent with LLO and reduce diffraction from the edges.

More detailed report to follow.

H1 - HWSY return beam

L1-HWSY return beam

I noticed some red on the CDS Overview and saw that it was a timing error at EY. Verbal reported it at 22:43:43 UTC but was muted for interviews so no one noticed. 

A attached a screenshot of the timing system medms.

FRS 8142
alog 36213

Vacuum group reported GV5 MEDM status did not change once GV5 was hard closed. Issue was traced to a cabling error inside the Vacuum Controls Chassis for LY. The wiring document E1500365 needs to be updated to reflect new change. Readback status of GV5 now shows as being hard closed.

F. Clara, G. Moreno

• 15:57UTC - Chandra in LVEA
• 16:11UTC - notified that a Nova film crews is coming to OSB/CR/LVEA
• 16:20UTC - Chandra, done in LVEA
• 16:38UTC - Nova crew arrives, is on site
• 16:45UTC - JeffB to EY and EX to check dust monitor pumps
• 16:51UTC - fire department here to check ladders... tracked down Bubba who confirmed this was a legit visit from HFD, he met them out front
• 17:15UTC - JeffB, issue at EY, will be there for a while
• 17:28UTC - Karen and Christine to LVEA
• 17:32UTC - JeffB back from EY
• 17:33UTC - Travis to LVEA
• 17:45UTC - tour
• 17:48UTC - Aidan and TJ to HAM4 to work on Hartman
• 17:48UTC - Travis out of LVEA
• 17:54UTC - Gerardo to LVEA, GV5, to check on it
• 18:01UTC - JeffB to EY
• 18:02UTC - Karen to MY
• 18:15UTC - Nova crew on arms
• 18:49UTC - Gerardo and Fil to GV5
• 18:51UTC - Travis to MX
• 18:54UTC - Jenne and film crew person to LVEA
• 19:07UTC - Karen done at MY
• 19:10UTC - tour leaves, I open the doors to outside for about 5 minutes to clear the perfume, etc. from the air
• 19:10UTC - TJ runs ISC_LOCK down script, he and Aidan are only persons working on H1
• 19:12UTC - ISC_LOCK in IDLE
• 19:28UTC - TCS test on Hartman is running, optic alignments need to remain as is for another 1.5+ hours
• 19:40UTC - Gerardo and Fil out of LVEA
• 20:38UTC - filming in the CR, getting set up
• 20:47UTC - Gerardo and Fil back to GV5
• 21:26UTC - Corey to sqeezer bay
• 21:54UTC - Nova begins to film Mike
• 21:59UTC - Gerardo and Fil done at GV5, heading to EY to look at BRS
• 22:07UTC - Travis opening the roll up door in cleaning area
• 22:40UTC - Gerardo and Fil back from EY
• 22:40UTC - Robert at EY
• 22:41UTC - Aidan and TJ to HAM4 to work on Hartman
• 23:00UTC - Robert back from EY
• 23:00UTC - Nova filming continues
  • at this time it appears that these people are still int the LVEA
  • Aidan
  • TJ
  • Corey
  • Chandra
  • I'm not aware of anyone at end or mid stattion
• ISC_LOCK is in IDLE
• IMC is locked

Trend of X&Y beam manifold pressures through various modes of pumping over two days.

I turned the RH drivers back on. ITMY RH was turned onto 6W total power for the last two hours (and now turned off again). ITMX RH returned to 0.5W total power.

Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 84 seconds. TC B did not register fill. LLCV set back to 21.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 857 seconds. LLCV set back to 32.0% open.