TITLE: 06/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Longer maintenance day today, with activities wrapping up an hour or two ago. We've made it through initial alignment but there was no green light in the arms when Oli and I first started locking. We ran the baffle align scripts for the TMS and ITMs but ended up finding the arms by hand. The rest of initial alignment was hands off. The wind has increased and ALS is now having a rough time staying locked, so we'll see how the rest of locking goes.
LOG:

A consequence of WP 11919 today is that we should be able to see the range calculation (eg on the control room wall) for the GDS-CALIB_STRAIN-type channels for more of the time.  Now, rather than needing the overall IFO to be ready for Observing (i.e. at NomLowNoise and no SDF diffs), there should be a range calc (for, eg, the thick red line on the range plot on the control room wall) thorughout much of the locking sequence, just like the range that is calculated from Cal-DELTAL_EXTERNAL (the thin line on the control room wall range plot).

No other configurations have changed, but this will be something that looks different from how it had been, so it's worth noting in the alog.

FranciscoL, [Remote: RickS]

After one week of having the inner beam centered (alog 78247), on June 11, we moved the beam by 5 mm on the Rx sensor.

The Rx side cover was compromised due to work being done by the vacuum team (images attached for reference.) Fortunately, the back cover was accessible and the measurements were done accessing the Rx input aperture through there. There might be a minor uncertainty on the alignment of the target - it was done by "projecting" the front of the power sensor by using the front camera of my phone; instead of the usual alignment by eye. Since the procedure had a regular/similar flow as the movements done on previous weeks, uncertainty of the target alignment should not be problematic for our measurements.

Attachment 'AlignedTarget' shows the alignment with the beam height gauge. Attachment 'BothBeamsBefore' shows the beams before making any changes. The pdf 'EndStationLog.pdf' lists the voltage values after each significant step of procedure T2400163. The steps represent writing down a voltage value after a particular change to the beam position. Some steps were recorded multiple times after minor changes.

• (2) Only inner beam at Rx detector. (see image 'InnerBeamBefore')
  • The beam voltage was maximized before making a move. The first two values are before attempting to move. The third value comes from making a horizontal move. There was an increase of about 0.014 V (1.6%) from this move. There was no increase from moving vertically.
• (3) Finalized beam movement. (see image 'InnerBeamAfter')
  • Signal is significantly higher, ~ 4.1%, than the centered beam.
• (8) Target off. The measurement was recorded after placing the pcal enclosures.

The 'Initial' measurement is *equal* to the last voltage measurement from the previous movement, done on May 21 (alog 78247). The initial and final voltage measurement during today procedure remained the same despite the increase of the inner beam with the target.

We expect this movement to be symmetric (equal in magnitude, opposite in sign) to alog 77840

J. Kissel
TIA D2000592: S/N S2100832_SN02
Whitening Chassis D2200215: S/N S2300003
Accessory Box D1900068: S/N S1900266
SR785: S/N 77429

I've finally got a high quality, trustworthy, no-nonsense measurement of the OMC DCPD transimpedance amplifiers frequency response. For those who haven't seen the saga leading up to today, see the 4 month long story in LHO:77735, LHO:78090, and LHO:78165.

For those who want to move on with their lives, like me: I attach a collection plots showing the following for each DCPD:
Page 1 (DCPDA) and Page 2 (DCPDB)
    - 2023-03-10: The original data set of the previous OMC DCPD's via the same transimpedance amplifier 
    - 2024-05-28: The last, most recent data set before this, where I *thought* that is was good, even though the measurement setup was bonkers, 
    - 2024-06-11: Today's data
Page 3 (the Measurement Setup)
    - The ratio of the measurement setup from 2023-03-10 to 2024-06-11.

With this good data set, we see that
    - there's NO change between the 2023-03-10 and 2024-06-11 data sets at high frequencies, which matches the conclusions from the remote DAC driven measurements (LHO:78112) and
    - there *is* a 0.3% level change in the frequency response at low frequency, which also matches the conclusions from the remote DAC driven measurements. 

Very refreshing to finally have agreement between these two methods.

OK -- so -- what's next? Now we can return to the mission of fixing the front-end compensation and balance matrix such that we can 
   - reduce the impact on the overall systematic error in the calibration, and 
   - reduce the frequency dependent imbalance
that were each discovered in Feb 2024 (see LHO:76232).

Here's the step-by-step:
- Send the data to Louis for fitting.
- Create/install new V2A filters for A0 / B0 bank
- Switch over to these filters and accept in SDF
- Update pydarm parameter file with new super-Nyquist poles and zeros.
- Measure compensation performance with remote DAC driven measurement of TIA*Wh*AntiWh*V2A
	confirm bitterness / flatness

Once IFO is back up, running, (does it need to be thermalized?)
- Measure balance matrix, 
	Remember -- SQZ OFF
	confirm better-ness / flatness
- Install new balance matrix
- Accept Balance Matrix in SDF

Once IFO is thermalized
- grab a new sensing function.
- push a new updated calibration

FAMIS tasks 24852 and 24876, WP 11915

Procedure checklist for both stations completed.  No issues were identified at this time.

MX: Scroll pump hours: 218.0

       Turbo pump hours: 128

       Crash bearings: 100%

EX: Scroll pump hours: 7146.0

       Turbo pump hours: 1097

       Crash bearings: 100%

A PEM AA chassis was installed at EY in the H1-TCS-YC1 rack, slots U11/12. Unit was left powered off. An ADC will be installed in h1iscey IO chassis at a later date. Same as EX (alog 78368). Magnetometer cables were rerouted to allow installation of new chassis.

PEM AA Chassis: Serial Number S2300113

F. Clara, M. Pirello

WP 11914
ECR E2200401
Drawing D1301004

A PEM AA Chassis was installed in the H1-TCS-XC1 rack, slots U10/11. The AI Chassis D1101785 was moved to slots U13/14. An ADC card and adapter card were installed in the h1iscex IO chassis (third Adneco, first slot). The PEM AA chassis is part of the PEM upgrade ECR E2200401. Chassis will be used for testing of the LIGO DAC32 card.

PEM AA Chassis: Serial Number S2300112

D. Barker, F. Clara, M. Pirello E. Von Reis

Tue Jun 11 10:11:49 2024 INFO: Fill completed in 11min 45secs

Gerardo confirmed a good fill curbside.

There was a small typo on for a filter bank SUS-ITMX_L3_LOCK_L on line 55. By the time I noticed this and fixed it, it delayed it by ~7 min. The measurement completed and we lost lock about a minute afterward, but this seems more like a coincidence.

TITLE: 06/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 1mph Gusts, 0mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY:Locked for 29.5 hours! Magnetic injections currently running. We have a 6 hours maintenance window today.

Workstations were updated and rebooted.  OS packages were updated.  Conda packages were not updated.

TITLE: 06/11 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
INCOMING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 1mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.13 μm/s
SHIFT SUMMARY:

H1 has been locked and observing all shift which is now 23 hours.
Everything seems to be running well.

Cosmic crew still staged in the MPR.

LOG:

FAMIS 26308 HVAC Vibrometer fans

The H0:VAC-MY_FAN1_270_1_ACC_INCHSEC saw a decrease in signal 3.5 days ago that also looks like it have more noise on the signal.

TITLE: 06/10 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 13mph Gusts, 10mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

H1 Has been locked  for 14 hours and 20 minutes and is currently OBSERVING.
All systems seem to be functioning well.
 

TITLE: 06/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 127Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

For the morning H1 was in Observe (from Tony at 2am!) and shortly later we transitioned to Commissioning.  (much of this occurring under a glow of blue light from the visiting film crew!)  

The film crew completed multiple shots of Nergis, and filmed interviews with Sheila, Ibrahim, and Corey.  And we had lots of extras in the Control Room as well.  This work was mostly done after 1pm (they then moved to the Staging Building, LExC (early eve), and other shots?).
LOG:

• Film Crew has been in/out the site since atleast 730am; For the Control Room we had  studio lighting starting at 845amLOCAL and filming in the Control Room 
• 1455-1507 Addressing a fan near Filter Cavity End Station, no entry into main room (eric)
• 1458-1523 Optics Lab/Vacuum Prep technical cleaning (karen)
• 1520-1554 X1 Tube set-up for film crew & grabbing a fan (Tyler, eric)
• 1535-1855 Started to take (3) violin modes which weren't at their NOMINAL value (ETMy [Mode 1&4], ETMx [Mode 8], & ITMx [Mode 8 & 9]) back to their NOMINAL settings (corey)
• 1550 Out of Observing for COMMISSIONING
  • 1550 Squeezer Alignment (naoki)
  • 1557 & 1705 A2L meas (jenny)
  • .1630 Making a filter change (sheila)
  • 1833 Back to OBSERVING
• 1606-1735 MY cleaning (karen)
  • 1617-1700 MX cleaning (kim)
• 2035 PCal work for much of the afternoon--with a lunch break (francisco)
• 2109-2142 Drone test flights around OSB parking lot (richard)
• 2247 SHG green beam work in optics lab (terry)
• 2253 Incoming M5.1 earthquake from east Pacific Rise

On Friday 06/07/2024 Dave Barker sent an email to the vacuum group noting 3 spikes on the pressure of the main vacuum envelope, I took a closer look at the 3 different events and noticed that the events correlated to the IFO losing lock.  I contacted Dave, and together we contacted the operator, Corey, who made others aware of our findings.

The pressure "spikes" were noted by different components integral to the vacuum envelope.  Gauges noted the sudden rise on pressure, and almost at the same time ion pumps reacted to the rise on pressure.  The outgassing was noted on all stations, very noticeable a the mid stations, and with less effect at both end stations, and for both with a delay.

The largest spike for all 3 events is noted at HAM6 gauge, we do not have a gauge at HAM5 or HAM4.  The one near HAM6 is the one on the relay tube that joins HAM5/7 (PT152), with the restriction of the relay tube, then the next gauge is at BSC2 (PT120), however the spike is not as "high" as the one noted on HAM6 gauge.

A list of aLOGs made by others related to the pressure anomalies and their findings:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78308
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78320
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78323
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78343

Note: the oscillation visible on the plot of the outer stations (Mids and Ends) is the diurnal cycle, nominal behavior.

P. Baxi , J. Kissel 

Finished characterizing (Channels 1 to 4) of the new 524KHz Analog OMC Anti-Alias Chassis - S2300162

• Bode plot for the system include the Transfer function and Phase of each individual Channels (1 to 4) and their (Channel 2 to 4) respective ratio with Channel 1 for comparision. The system was characterised from Start Frequency of 1KHz to a Stop Frequency of 102.4KHz with 100 steps.

                       BodePlot_Channel_1_4_freq_start_102.4KHz_Freq_stop_1KHz_Steps_100.pdf  (raw data - available in DCC S2300162)

              - We see the frequency response has minimal phase impact in the gravitational wave band, with deg of phase loss at 1000 Hz.

• Noise Measurements for Channels 1 to 4 with reference to the noise of SR785 is shown in the plots below. To achieve the maximum frequency range we incorporate and merge three frequency spans: 4Hz to 3.2 KHz, 32 Hz to 25.6 KHz, and 128Hz to 102.4KHz.

                       ASD_SR785_Channel_1_4_Freq_span_4to32K_32to256K_128to1024K.pdf  (raw data - available in DCC S2300162)

              - We see the noise of each of these 4 representative ADC channels is around ~20 nV/rtHz

• Python scripts to regenrate the plots. (Bode plot and ASD plots) 
• Measurement notes to reproduce the above raw data.  (Bode plot and ASD plots) 

LLO noted a 10 Hz comb that was attributed to the IRIG B monitor channel at the end station connected to the PEM chassis. (https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=71217)

LHO has agreed to remove this signal for a week to see how it impacts our DARM signal.

EX and EY cables have been disconnected.