S. Dwyer, J. Kissel

While inspecting HAM6 regarding the broken OMC REFL Beam Diverter Dump, we took the opportunity to check out the fast shutter.

We saw several things of concern:
    (1) The cabling that emanates from the shutter itself looks (and has been previously confirmed to be) very close to the main IFO beam path. Koji indicated in his LHO aLOG 28969 that "the clearance does not look great in the [above linked] photo but in reality the beam is clearly away from the wire."
    (2) One of these wires (the wire closer to the IFO beam) has a kink in it, but no visible burn marks, so we suspect this is from mechanical manipulation during install.
    (3) OM3's readout cables are kinked in a stressed position to make room for the fast shutter, which is a little forward (-Y, away from the beam splitter) of the position indicated in the drawing likely because of this interference.
    (4) Some small fleck of particulate on the inside of the "toaster" face, on the HR (back towards OM1) side of the shutter.

I attach picture collections of these things (admittedly the particulate pictures are not great -- we tried lots of times to get a good picture but failed).

Hopes:
   Re (1): Can we find a way to route these cables below the beam line, instead of surrounding it?
   Re (2): Same as (1)
   Re (3): Can we replace OM3's OSEM cables with a 90 deg backshell, so as to clear room for the fast shutter and relieve stress on the cable?
   Re (4): hopefully this is not from the HR surface of the fast shutter optic

S. Dwyer, J. Kissel

This completes the investigation of the broken beam dump found in HAM6 (see LHO aLOG 38918) -- the beam dump has been identified as the OMC REFL Beam Diverter Dump. 
This beam dump captures light *down stream* (toward the OMC) of the fast shutter.
The dump was broken in a relatively clean vertical fracture which lines up with the dump's set screw, and when reconstructed appears to show a small pock-mark from an apparent small laser blast.

While there's no way to prove why it broke, we have two main suspicions:
   - The black glass is secured to the dump's mount with metal set screws. It has been suggested that all such black glass should be secured with PEEK set screws. If not, these metal screws create un-due stress on the glass, especially if over-tightened.
   - During observation, it has become standard to leave the OMC REFL path's Beam Diverter CLOSED, i.e. blocking the path from hitting the OMC REFL QPDs and/or exiting HAM6 onto ISCT6. Thus, during some high-power lock loss in which both
      - the fast shutter protection failed, leaving the OM2 > OM3 > OMC > OMC REFL path exposed, and
      - the OMC was unlocked sending lots of OMC REFL light down the REFL path (instead of through the OMC, if it were locked).


Picture highlights and labeled drawings are attached as .jpgs, and a more complete collection of pictures are compressed as a .pdf.
Regarding the metal set screws on this dump: a survey of other similar beam dumps in the chamber indicate that *all* such dumps in HAM6 are secured with metal set screws (see 2017-10-11_HAM6_BumpDump_SetScrews.pdf).

Open question:
   - Was the beam diverter closed when the shutter failed and killed the OMC DCPDs in Aug 2016 (LHO aLOGs 28820 and 28842)?
   - If closed, did we inspect this path / dump when we went in to fix the DCPDs?
       This picture from the Corey's Resource Space collection show that the dump is at least intact then.

TITLE: 10/12 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: 13mph Gusts, 7mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY:

As Dave mentioned (38991), we have started the model for running the squeezer ASC, although we don't have cables to the actual hardware yet.  

This is a simple model, which takes in the 16 AS_A and AS_B RF42 signals and processes them for sending to ZM1 and ZM2.  The attached medm screenshot isn't finished yet but shows the basic functionality. 

Most of the difficulty was with getting the channel names to be what we wanted.  We wanted to make this a new model rather than adding more parts to the ASC model because the ASC model is already so big that we run into problems with the RCG.  Because the squeezer WFS are really just an additional demod of the AS WFS, I wanted their naming to be consistent with the rest of the AS WFS channels (H1:ASC-AS_A_RF42  ect). 

The model is broken into two blocks, one of which has the top name ASC and just has the standard WFS parts in it, the other is actually two nested blocks, SQZ with a common block called ASC inside of it which has the matrices and servo filters.  This was done so that the channel names would be SQZ-ASC.  As Dave mentioned we had to change the model name from h1sqzasc to h1sqzwfs to be able to use the name ASC in the model without causing a conflict with the actual ASC model's DCU_ID channel.  

The models and the medm screen (still in progress) are in the squeezer userapps repo.  

G. Moreno, J. Kissel, N. Robertson, B. Weaver

Gerardo and Norna finished installing and cabling up the temporary OSEMs on the current OFI for testing. I helped them buzz out the wiring into the ADC and center the OSEMs.
More details later, but I want to get these numbers in the aLOG: 
  ADC Channel            OSEM     Open Light Current         OSEMINF Offset
ADC0_28                         LF      32767                                16383.5
ADC0_29                         RT     30455.2	                             15227.6
ADC0_30                         SD     30319.6	                            15159.8

Note, when we found the system, the temporary cables were hooked up incorrectly to the last DB9 input (analog 29-32, or digital 28-31) of h1sush56's ADC 1's AA chassis (i.e. U33) in the SUS-C7 rack (incorrectly -- according to D1002740). I've moved the cable to the last DB9 input of ADC 0's AA chassis (i.e. U34) as suggested in D1002740, and was able to use the new OFI MEDM infrastructure as designed (see LHO aLOG 38827 for front-end code, aLOG is still pending on new MEDM screens).

Today, Travis and I put the ITMx main and reaction chains back together and bolted them up.  This process included reseating the UIM and PUM magnet flag assemblies to their proper controls configuration and reattaching them to their 8 respective locations.  We also had to apply First Contact to the CP-HR side and peal it and the ITM-AR sheet prior to pushing the structures togetehr to their nominal 5 mm separation.  The unit is still sitting just outside of the chamber, waiting for install later this week.

GariLynn and I also spent some time installing the AUX alignment system she procured for us in the ITMy chamber.  It is currently installed/clamped to the in-chamber stool pointing toward HAM4/5/6.  We'll continue alignment of various targets tomorrw.

Daniel, Sheila, Dave:

we opted to rename the model h1sqzwfs to resolve an EPICS channel naming duplication while preserving the correct fast channel names.

Because the original model had already been installed, I hand edited the rtsystab, H1.ipc and testpoint.par files to correct the name. The new model was added to the DAQ and to the CDS overview MEDM.

DAQ was restarted at 16:27 PDT to acquire h1sqzwfs

TITLE: 10/11 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
LOG:

16:05 Gerardo out to VPW

16:15 Betsy and Garilynn out to biergarten

17:27 Fil to MX to look for PEM test equipment

17:31 Gerardo out to HAM5

17:43 TJ out to HAM5

17:45 Jeff K and Sheila out to squeezer area

18:36 Jeff and Peter out of the PSL

19:10 Richard into CER

19:41 Fil to LVEA

20:15 Richard back into the CER

20:26 Jeff and Peter back into the PSL to check for water leaks

21:08 Travis and Betsy out to biergarten

21:31 Norna and Gerardo out to HAM5

There was some ambiguity as to whether the NPRO noise eater was on or off because the MEDM screen
did not change.

    Attached is a plot of the NPRO output as seen by the photodetector inside the front end laser
with the noise eater toggled on and off.  Clearly the switch on the power supply works.  However
the status indicator did not change.  The output voltage of the photodetector was 0.210 V and the
number of counts on the MEDM screen was ~ -335.  Blocking the light to the photodiode resulted in
the status indicator changing and an increase in the number of counts to ~ -5000.  We know that
the change in status occurs around ~ -1792 counts.

    I do not recall when this problem first manifested itself.

Sheila, Dave:

the first version of the h1sqzasc model was started on h1asc0 yesterday. We noticed an EPICS channel was a duplicate of h1asc (H1:ASC-DCU_ID), caused by top naming an ASC block in h1sqzasc. We are working this issue. Until it is resolved I'll not add this model to DAQ.

Jeff and Dave:

late entry from yesterday evening. Jeff made a model change to h1susopo (binary IO) which required a DAQ restart at 17:05 PDT Tuesday. I have just renamed the partial second trend frame file to permit NDS1 to provide date when spanning the gap.

Kyle, Chandra

CP2's bottom fill valve (V1) had an obstuction and was allowing LN2 to sneak past and pressurize and frost the line that truck deliveries use to fill the Dewar. Both top and bottom fill valves felt closed, but Kyle opened and reseated both. Fixed.

Elevated HF in plots is clearly due to work being done in-chambers.

TITLE: 10/11 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: 3mph Gusts, 1mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

15:30 Travis out to biergarten with Fil

I'm covering for Cheryl.  Ed covered for me from 8:50 - 10:50.  Cheryl covered 12:30- ?.  Patrick covered from ?-2:30.  And now I'm back to cover while Cheryl heads out to HAM2.

Had "Noise Eater out of range" verbal alarm this morning.  Ed mentioned filing an FRS for this on behalf of Jason.

Day's Log Of Activities

• 15:45 CER Work (Richard, Ryan)
• 15:47 Christina out to EX
• 16:01 Travis out to biergarten
• 16:03, 18:13 Betsy heading out to biergarten a few times.
• 16:15 Cintas on site
• 16:27 Jason out to reset Noise Eater
• 16:28 Elizabeth out to HAM6 area to retrieve equipment (non-specific)
• 16:52 Elizabeth is back
• 17:06 LN2 delivery for CS-X
• 17:57 IAS equipment removal from beer garden; will likely go into afternoon (Jason)
• 18:02 Paradise water 
• 18:04 - 18:28 UofWash Tour (Richard)
• 18:53:26  Jason - GV7 is hissing
• 18:53:37  Travis is out for lunch
• 19:28:02  Jason out of LVEA
• 19:28:31  Richard to CER to test a phone
• 19:34:13  Keita, Ed, Corey, to HAM2 to swap optics
• 19:34:52  Richard to LVEA to deploy phones
• 19:35:10  JeffB out of optics lab
• 20:12:15  Richard is out of the LVEA
• 20:15:11  Travis to ITMX
• 20:37:04  Patrick rebooting ISC at EX
• 21:08:36  Hugh to HAM6
• 21:30 Cheryl out to HAM2

As of 23:12UTC: (completed by Cheryl)

• Jason, Betsy, Travis - at ITMX, not in chamber, in the cleanroom
• Keita, Ed, Corey - out of the LVEA from HAM2
• Gerardo - out of the LVEA

Betsy, Hugh, TJ

Last week Betsy put the heater on the table and today Hugh checked it's vertical center with an auto-level. Some washers were added to get it as close to center as possible, which ended up around 0.4mm high. Betsy and I then had to wiggle the assembly into place, and rotate the entire gold ceramic holder to allow the screws on the outside to clear the OSEM brackets. The heater is currently sitting ~6mm away from the back of the SR3 optic and it is plugged into the feed through.

Picture attached.

J Warner, S Dwyer, S Cooper

We've been looking at what we should do during large earthquakes. The attached plots show the state of both the SEI Guardian (State N), and the L2 watchdog (L2 WDMON) channel, the L3 Oplev and the HEPI L4C's (as the ground STS's saturated) for the 8.1 magnitude Mexico earthquake (GPS: 1188881718), alog 38570, for the chambers ITMX,ITMY,ETMX,ETMY. During the earthquake, all the ISI's tripped as well as the ITMX suspension watchdog. From these plots we think that the decrease in amplitude of the Oplev signal is due to the reduction in ground motion around this time, rather than damping of the ISI, as both the damping and the reduction in ground motion occurred at similar times.