Keita has transitioned EY to laser hazard.

     -Niko

7 weeks of BRSX and BRSY driftmon channels. BRSX is below between 2017-12-28 and 2018-01-04, and above between 2018-02-01 and 2018-02-15. BRSY is within boundaries.

Pressure will rise at CP4 PT-245 while the turbo is valved out again today.

Jim Warner, Georgia Mansell, Sheila Dwyer

This morning we went back to EY to make some follow up measurements with the electric field meter that Rai brought. (40599 and 40597).  Our main result was to confirm that below 300 Hz the measurements we made on Monday were dominated by acoustic noise from the purge air and clean room, and that some care should be taken to mount the meter so that it has some isolation from acoustic noise and ground motion. It also seems like the line we identified as being from the CPSs on Monday is not actually the CPS line, and we are not currently seeing any signal from the CPSs in the field meter.  

Today the field meter was oriented to measure fields parallel to the beam direction and we did not rotate it.  We first repeated the measurement we did on Monday with the cleanrooms and purge air on.  We then turned off the cleanroom over the BSC chamber (leaving the others alone) and repeated the measurement, then repeated it with the purge air also turned off (top panel of attached plot).  We saw that a line at 33.8kHz was coming from the cleanrooms, and that the noise below 300 Hz was driven both by the cleanroom and purge air motion, as we suspected on Monday after seeing that the spectrum didn't change when we added a tin foil Faraday cage. 

We made a single measurement where we attempted to turn off many of the expected sources of fields in the chamber.  

• We powered off the ISI interface chassis for the GS13s, L4Cs, and CPSs
• We powered off the T240 interface chassis
• We powered off the ISI coil drivers
• We powered off all 4 of the HEPI interface chassis on the HEPI piers
• We powered off the CPS timing fanout chassis
• We took the suspensions to safe and unplugged at satellite amplifiers for all osems (ETM and TMS).  We unplugged the cables from the chassis, not the cables to the flange, and saw that the LEDs were no longer lit.
• We powered off the low voltage driver for the ESD. 
• We unplugged the illuminator power
• We turned off the OpLev laser
• The ring heater chassis was powered off before we started this work, and remained off. 

We repeated the measurement with the clean room and purge air off and saw that powering off all of these items didn't make a difference in our spectrum (bottom panel of attached plot).  To confirm that we had really turned of the CPSs, Jim unplugged one of the cables from the CPS interface that is a silver chassis on the cable tray, no error light lit up when he did this. 

Hugh looked up for us the frequency of the CPS clock signal, which is 25.725kHz.  The second attachment  shows the spectra zoomed in around 25kHz, and you can see that the line we see is at 24.8kHz, so it may be due to something other than the CPSs. 

We will take a break from making these measurements for a few days while the end station alignment work is going on, but if we have an opportunity Rai has requested that we try the measurement with the neutral pin of the power supply grounded to the box and floating.  If possible we would also like to mount the meter so that it is held off of the bench and has some vibration isolation. 

Framing is erected and most of the insulation pads are up. Need to work out some bugs in the electrical. Reworked a few areas of strut interference. Designer will create as-built drawings. Thanks everyone for your help today: Ken, Mark, Richard. Tomorrow we resume.

After hearing that both the TMS and PCAL beam alignments did not recover after we swapped the ETMY and aligned it to the OPLEV, I did some brainstorming with Daniel, Sheila, and Keita who were in the CR.  A few trends of OPLEV data later, and I'm thinking that Travis and I have aligned the ETMY to the incorrect OPLEV beam.  

There are 4 red beams heading towards the ETMY OPLEV receiver, of which Travis and I convinced ourselves that we understood the second from the bottom to be the main reflection beam based on the wedge orientation (it's also the brightest, which maybe doesn't matter based on the coating).  Even if this is the correct OPLEV beam, it is not obvious that this was the beam that was used for the "before" alignment of the ETM.  However, a quick look at the trend attached shows that the SUM of the OPLEV was much lower than it is now prior to the test mass swap, maybe arguing that we've got the wrong beam.

Tomorrow we will point one of the other 2 possible beams onto the OPLEV and see if the PCAL and TMS pointing are restored.

We went in the EY chamber and saw that the return beam was off on the secondary mirror at 1:30 position, the radial distance from the forward going beam was maybe 5 or 6mm. The return beam was not even hitting the bottom periscope mirror under the TMS optics table.

We steered TMS suspension as much as we could using the bias slider and it was clear that we need at least twice the range for YAW, more for PIT. We need positive PIT and YAW, both at around a milliradian. That's huge misalignment.

This cannot be ring ERM as the original ERM was wedge-less.

The wedge of the new ETM is somewhat different (old one was 0.076 deg, new one 0.07, the difference is 0.006 deg or 100 urad), and this is not large enough to cause milliradian difference.

We checked apparent interference but we couldn't do a thorough job.

We installed kapton washers to the picos, but we haven't installed collars as it will change the TMS balance (we will NOT fix the lack of collars as there's no need for gross motion of picos at this point).

FAMIS 6563

Added 100 mL H2O to the H1 PSL crystal chiller. The lower left canister filter is discolored. The top right canister filter is white and clear of debris.

The fault light on the diode chiller is not lit.

Bubba, Gerardo, Kyle 

We removed BSC1's North Door for Betsy W. and re-installed after she completed her in-chamber work.  We are pumping BSC1's annulus with a small turbo backed by a leak detector overnight.  We expect to helium leak test the door in the morning followed by submission of a WP to pump down the Vertex Volume.  

Maik F, Jeff B, Jason O, Peter K, Matt H

Quick summary of recent tasks:

• Beckhoff updates to the new 70W version of the code
• Installed the 70W amplifier diode box and wired up the diode box and the interlocks
• Disconnected the HPO diode boxes and drained them
• Inspected the fibre ends of the recently pulled front end fibres (to be used for the 70W). These were very dirty (at both ends) and needed cleaning. Connected the fibres to the 70W amplifier diode box (using T1500002 as a rough guide)
• Undertook a slope measurement of the 70W amplifier diodes. These correspond very well to the values taken before shipping from neoLASE (data taken from T1700327).
• Connected up the 70W amplifier to the water manifold.
  • One of the connectors of the 70W amplifier leaked (at the thread to the housing). Connection was very loose. Tightening up the connector sealed the leak.
  • We found that the power meter connector to the flow sensor had a wire with its cladding partially stripped off and could cause an intermittent short. Im pretty certain this is the case of the power meter watchdog faults that LHO were seeing occur.
    • We also need to probably cut and re-terminate some of the cables going to the manifold from the control box, so as to get the additional flow sensors into the system.
    • Additionally though the water is flowing work needs to be done to "quieten" down the water manifold
• Connected fibres to the 70W amplifier (after cleaning and Turned on the 70W amplifier (to ~15Ampls) to test that it turns on and that ASE/pump light is emitted. (it does).
• Working on updating various documents related to the 70W work

Summary of the pin layout of the ESD segments as seen from the air-side feed-through connector. Same configuration for ITMY, ITMX, ETMY, and ETMX.

Pin 1 - LR
Pin 2 - UR
Pin 3 - BIAS
Pin 4 - UL
Pin 5 - LL

Following E1400430, Pin 1 is slightly offset in spacing from the other pins. New style feed-through has a one to one pin layout (pins are not flipped inside flange).

ITMX/ITMY alog 39744
ETMX alog 19221
ETMY alog 15656

TITLE: 02/22 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

15:49 UTC Kingsoft water through gate to service RO
16:07 UTC Bubba to LVEA to prep for removing BSC1 door, craning engine hoist
16:08 - 16:16 UTC Hugh to LVEA to retrieve tools, then to end X to lock HEPI
16:14 UTC Peter and Carlos to PSL enclosure
16:32 UTC ISI ITMY stage 2 WD tripped (craning engine hoist into beir garten on camera)
16:39 UTC Corey to LVEA to install posts on top of in air tables
16:48 UTC High dust alarm at end X
16:56 UTC BSC1 north door being removed
16:56 UTC HEPI ETMX WD tripped
16:58 UTC Jason to PSL enclosure to join Peter (WP 7366)
16:59 UTC Betsy to LVEA (BSC1)
17:03 UTC ISI EMTX stage 2 WD tripped
17:15 UTC Travis to end Y to remove cover from ETMY
17:16 - 17:22 UTC TJ to LVEA to retrieve tote of parts
17:21 UTC Jason and Peter back
17:31 UTC Gerardo to BSC1
17:31 UTC ISI ETMY stage 2 WD tripped, SUS TMSY WD tripped
17:33 UTC TCSX CO2 laser off
17:34 UTC Alvaro to optics lab
17:34 UTC TCSY CO2 laser off
17:37 UTC Nutsinee to ISCT6
17:38 UTC Kyle and Bubba removing BSC1 north door, Betsy has turned off CO2 lasers and removed keys
17:39 UTC Hugh back, end X HEPI is locked
17:42 UTC ISI ITMY stage 1 WD tripped
17:44 UTC Jeff K. to LVEA to talk to Betsy
17:49 UTC Travis done
17:51 UTC Sheila, Georgia and Jim to end Y, WP 7365
17:52 UTC ITMY HW WD tripping
18:07 UTC Travis to LVEA
18:12 UTC Filiberto at end Y, retrieving high voltage tester, fixing cable
18:12 UTC TJ to LVEA to retrieve part and then to optics lab to work with Alvaro
18:19 UTC Travis back
18:27 UTC Corey to end Y
18:30 UTC Marc to LVEA to check on squeezer equipment
18:40 UTC Marc back
18:40 UTC Ed to SQZ racks by HAM6 to shorten cables
18:46 UTC Keita transitioning end Y to laser hazard
18:56 UTC Filiberto back
19:14 UTC Filiberto to BSC1 for HV testing
19:15 UTC end Y is laser hazard
19:17 UTC Marc retrieving cable from LVEA
19:34 UTC Jeff, Filiberto, Betsy back. Kyle and Bubba putting door back on
19:39 UTC Columbia Center Engineering through gate
19:54 UTC Corey done at both end stations. Going to LVEA to put equipment back.
19:55 - 20:02 UTC Travis to LVEA
19:59 UTC Nutsinee back
20:02 UTC Mike F. and Matt H. to PSL enclosure
20:08 UTC Corey out of LVEA
20:17 UTC Keita back
20:19 UTC Jason to PSL enclosure
20:29 UTC TJ and Alvaro out
20:31 UTC Jeff K. measuring ITMY
21:09 UTC Georgia, Sheila and Jim back
21:14 UTC Took ITMY SUS to safe. Filiberto to BSC1 to pull cables
21:45 UTC Filiberto back
21:47 UTC Peter back
21:51 UTC TJ and Alvaro to optics lab
22:04 UTC Keita and Georgia to end Y
22:12 UTC Filiberto back to LVEA to check for short at feedthru
22:19 UTC Gerardo to mid Y
22:33 UTC Filiberto back
23:00 UTC Siteweekly meeting
23:58 UTC Jason and Matt done in PSL for day
00:04 UTC Betsy turning CO2 lasers back on, returning keys
00:04 UTC Jeff. B. back from PSL

In prep for removing the BSC1 door, I turned to OFF, and then removed the keys to the TCS lasers in the LVEA. 

To have a place to hold/anchor bundles of cables for the In-Air tables, fixtures were installed on the top of the enclosures of most of the in-air optical tables for H1; this includes:  ISCT2, TCSy, TCSHT4R, TCSx, ISCT6, SQZT6, ALSy, & ALSx.  (Could not install a fixture on IOT2 because there was other equipment in the way.)  For all tables, I handled cables & had to lift bundles of these cables to fit them on the new fixtures (see photos of various installations).

While closing out the recently replaced SUS ITMY R0 RT OSEM (alog 40634), found short on UIM chain. Short is on cable SUS_ITMY_16, pin 5, cathode side of LED for UIM UR.

Summary:
The core functionality of the Matlab DARM model has now been replicated in Python. Attached are figures in a single PDF file showing the primary results. By eye, these look reasonable. A more detailed study comparing to the Matlab model is forthcoming. I also replicated a study made for the L1 detector by Joe B. (see LLO aLOG 29622). I propose to call this code pyDARM.

Details:
I have ported most of the core functionality of the DARM model from Matlab into Python. So far, I have done spot checks by eye to make sure that the results look sensible. I have not yet done a detailed study comparing to the Matlab version, but will do so soon.

I have produced plots showing:
1) DARM digital filters
2) Sensing function
3) Actuation function
4) Open loop gain
5) Frequency dependent actuation authority of each stage compared to inverse sensing
6) Ratio of each stage to the overall calibration

As can be observed, the scale of each figure appears reasonable (comparing with, e.g., G1700316), the OLG is stable, and with a UGF with the correct value (by eye). The contribution of each suspension stage is closely matching L1's results using the Matlab model (see LLO aLOG 29622).

What was done:
- Write python version of Matlab functions to parse Foton filter files and to compute IOP downsampling filters from RCG code coefficients
- Exported numerical values of zeros, poles, gain, delay from analog AA and AI models (these are objects in .mat files)
- Exported ASCII file of the frequency response for the suspension force-to-length for each stage. This is read in and used in the python DARM model, and so far can only be at specific frequency points
- DARM filter bank digital filters computed, sensing function and actuation functions are computed from parameters
- Intermediary data products can be accessed
- Code structure is "flatter", meaning less jumps between different functions/files. Hopefully this makes the code more accessible and readable.

Required python modules (so far): scipy (e.g., filters), numpy (e.g., arrays/array math), collections (for namedtuples), matplotlib (for plotting)

Quirks found along the way:
- You can't directly multiply or add filter objects together in Python (the + and * functions are not overloaded in Python). I had to code up my own version to 1) add filters by using polynomials from roots, computing a transfer function filter, and then converting to a zpk object, all using scipy built-in functions; and 2) multiply filters by appending zeros together, poles together, and multiplying gain.
- The scipy sos2zpk() function is not exactly like Matlab's version. I found an extra zero and pole when converting because Matlab removes any zeros in the 3rd and 6th positions of an sos section before computing a filter from the sos coefficients

To do list (short term):
- More detailed study comparing Python with Matlab models
- Read in a config file
- Make an L1 model to check for any differences
- See if there is a way to read Matlab .mat file and objects therein. This didn't look trivial when I tried at first, which is why the analog AA and AI models were exported as well as the frequency response of each suspension stage
- Address how to get the force-to-length transfer function for each stage for arbitrary frequencies
- Add computations for GDS / DCS pipelines

Longer term:
- Hook this into a pipeline from measurement to model to uncertainty estimate pipeline