Sheila, Naoki, Camilla

We took FDS, Anti-SQZ and Mean SQZ data at different NLGs: 14, 17, 43, 82 and 123. We think we see evidence of frequency noise. We see less squeezing at high NLGs: around 4.5dB of SQZ at NLG < 43.1 but at NLG 81.9 and 122.8, squeezing at 1kHz reduced to 3.6 and 3.1dB. Attached Plot.

Each time we optimized SQZ angle around 1kHz. Because of this, the low frequency increased noise at high NLGs could be due to incorrect rotation, rather than phase noise. 

Data saved in /camilla.compton/Documents/sqz/templates/dtt/20231025_GDS_CALIB_STRAIN.xml

Vicky and Naoki did an NLG sweep on the Homodyne in 73562.

Famis 26063

In Lock charge measurements ran yesterday, and everything went smoothly up until the the line python3 coeffiencentplots.py . Ryan has an ALOG 73432 which Camilla pointed me to, This worked out well!
 

I made measurements of ringdown constants of the of this mechanical mode to get a measurement of the Q factor.

The measurements were admittendly quite ratty, and often the PLL would lock to some oscillation that it itself creates, giving many occasions where the oscillation vanishes immidiately as the injectoin ends.
This is largely due to the mechancial mode not being significantly larger than the noisefloor, causing PLL to lock to garbage.

Of the times I was able to excite the mechanical mode itself, I measured Q-factors of through the locked PLL amplitude signal:

• Q = 1.807e+06 ± 66650 (1 standard deviation)
• Q = 1.638e+06 ± 51260 (1 standard deviation)
• Q = 1.731e+06 ± 68250 (1 standard deviation)

So the Q-factor is approximately 1.7 million.

At the time of measurement, the frequency difference between the optical mode and the mechanical mode was 14.55 Hz.
Given the optical linewidth is roughly 1 Hz, this is "far" enough away to neglect optomechanical coupling and trust this as a true estimate of mechanical Q.

TITLE: 10/25 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 16mph Gusts, 11mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.20 μm/s 
QUICK SUMMARY: 
H1 is in NOMINAL_LOW_NOISE, but ....
Comissioning is still in progress for a few more minutes so the SQueeZrs can do some Anti-SQZin with different Non Linear Gains(NLG). 

TITLE: 10/25 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Now Locked for 20.5 hours. Had commissioning today starting at 19:07UTC and is ongoing but wrapping up soon.
LOG:

15:00UTC Detector Locked for 12.5hours

--Commissioning Start--
19:07 Out of Observing for Commissioning
19:09 To NLN_CAL_MEAS for Calibration measurements
    - bb measurements: 1382296233 - 1382296559
    - simulines measurements: 1382296585 - 1382297917
19:39 Back to NOMINAL_LOW_NOISE
19:44 - 20:05 DARM Boost
20:08 COMM Gain
    12: 20:08:17 - 20:10:17
     6: 20:10:29 - 20:12:29
    12: 20:12:44 - 20:14:44
     6: 20:14:58 - 20:16:58
    
20:20 - PRESENT SQZ ASQZ w/different NLG      

Ran a BB measurement followed by Simulines:

    - bb measurements: 1382296233 - 1382296559 (2023-10-25 19:10:15 - 19:15:41)
    - simulines measurements: 1382296585 - 1382297917 (2023-10-25 19:16:09 - 19:38:19)

Output files:

BB:
/ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20231025T191015Z.xml

Simulines:
/ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20231025T191609Z.hdf5
/ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20231025T191609Z.hdf5
/ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20231025T191609Z.hdf5
/ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20231025T191609Z.hdf5
/ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20231025T191609Z.hdf5

Today we tested the effect on DARM of additional resonant gains at 2.8 and 3.4 Hz, as described in 73698.

DARM RMS was reduced as expected from 1.6e-9 to 1.2e-9.

Looking at DARM spectrograms, there is no evident difference in the level of non-stationary noise.

Comapring the DARM PSD during two times, there seems to be a small improvement, but that might be a fluctuation.

In summary: the resonant gains improve the DARM RMS, but we don't see a clear improvement in noise; they don't hurt though 

In a follow-up to what TJ did yesterday(73685), I alternated the CARM gains (H1:LSC-REFL_SERVO_IN{1, 2}GAIN) between 6 (what it was nominally at) and 12 every two minutes.

Times when we were at each gain setting (in UTC):

   12: 20:08:17 - 20:10:17
    6: 20:10:29 - 20:12:29
   12: 20:12:44 - 20:14:44
    6: 20:14:58 - 20:16:58

Attached is an ndscope over this timeframe looking at the CARM gain and SQZ BLRMS channels (same as the channels that TJ and Camilla had been looking at yesterday(73682)).

Here is a list of the _known_ corrections to the systematic error that need to be accounted for when regenerating the O4a uncertainty budgets.



Issue
Start
End
Status

3.2 kHz ESD Driver Pole in CAL-CS Model (LHO:72043)
2023/04/26 (ER15)
2023/08/08 00:15 UTC
Rough fit exists. LHO:71787

 
Spoiled TDCFs due to noise in Kappa_UIM (LHO:71790, LHO:71846)
 
2023/07/20
 
2023/08/03
 
In progress. Pending correction file.
 

 
Thermalization effects seen in sensing function at 75W
 
ER15
 
2023/06/21
 
In progress by Cal group.
 
 
Thermalization effects seen in sensing function at 60W
 
2023/06/21
 
Now
 
In progress by Cal group.
 


There may be other corrections that are needed by additional unmodeled effects including OM2 hot/cold, drifting Kappa_T, and Pcal error that hasn't been accounted for (if any).

Useful reference: Record of Real-time Calibration Pipeline Parameter Changes: O4 (and ER15) -- H1 (DCC T2300297)

Observing at 157Mpc and Locked for 16.5hours.

We're right about to start some Commissioning for the next four hours.

I measured the optical modes moving in the OMC-DCPD-SUM signal where, with A LOT of averaging (when the optical modes are pseudo stable), the optical high order mode (HOM) spacing can be observed as its changing through a lock stretch.
I look at the spectrum visible in the 5.2kHz range; and the spectrum visible in the 80.3 kHz range.
There are 2 sets of optical modes easily visible. Currently I assume the one I need to worry about is the higher one that is substantially closer to 80297 kHz of the PI.

The 2 two times plotted correspond to:

• [Red] 14 Hours locking as of end of Tuesday Maintenance
• [Black] 28 locking as of the end of the lock just before Tuesday Maintenance

This should, in principle, correspond to 2*FSRx + HOM_spacing, but there is a slight discrepancy at both LLO and LHO (roughly 4 Hz by my estimates), which may be related to the small Gouy phase impact of the PRC, but I'm not sure exactly how.

For these measurements, the difference in frequency is 75047.61 Hz
For completeness,  2*FSRx = 75051.87 Hz (X-arm length is 3994.4704 m)

This is relevant to being able to track how far away we are in terms of optical mode spacing, from the mechanical mode Frequency in a DQ channel for post processing.

Wed Oct 25 10:17:16 2023 INFO: Fill completed in 17min 11secs

Jordan confirmed a good fill curbside. Note TCs only just cleared the trip level, outside temp was 45F at time of fill.

A follow up on the two new IFO range channels which were added to the DMT2EPICS_IOC and the DAQ yesterday.

Attachment shows a new MEDM I created which shows all four range channels, along with their GPS. This MEDM can be opened from SITEMAP -> OPS -> H1 IFO RANGES.

The ndscope second-trend plot shows that CAL has the largest range, HOFT the lowest, CLEAN and NOLINES are inbetween and are phase shifted versions of the same channel.

TITLE: 10/25 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 159Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 7mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.20 μm/s
QUICK SUMMARY:

In Observing and Locked for 12.5 hours.

TJ, Camilla. WP #11483.

Uninstalled the "new" S&K HWS laser (TSOP M1900163) from the ALS table, stored it in it's case in the LVEA TCS cabinets. Removed fiber and fiber launcher.  This was installed in 62089.

Reinstalled the "old"  diode source M530F2 (eye safe). Using M92L02 20um multi-mode fiber and original D1800125 fiber launcher. Reduced length of the tube of D1800125 fiber launcher as we thought we need to bring the F=125mm lens closer to the launcher.  

Realigned the path to get a retro-reflected beam off ETMX and checked this by mis-aligning ETMX. Took new references on EX, and ITMs at 00:08UTC.

Photos before and after attached. Decision made to swap back to original source in T2300336. Will update FRS 14310 with Aidan. 

Summary - Camilla and I removed the running TCSX chiller and replaced it with a new ThermoFlex 1400 SN#1153600201231003.

We've been having some issues with the TCSX laser relocking itself during Observing (ex: alog73331). This seems to be due to inconsistent water temperature from two of our three chilers, causing the temperature of the laser to shift slightly. We've swapped out SN#0110193301120813 for the new chiller and sent off the spare chiller for service. We input the settings from the CO2Y chiller and it the new chiller fired right up and seems to be outputing correct flow and pressure. We'll keep an eye on it the next few days.

I prepared a new filter module with resonant gains at 2.8 Hz and 3.4 Hz. This can be tried tomorrow (on during some commissioning time) to reduce the DARM RMS and see if it helps the non-stationary noise.

The new FM is loaded into DARM2 FM1 "RG2.8-3.4". It is not engaged now.

For future reference, here are the FMs that are used during lock acquisition:

DARM1: FM1 FM2 FM3 FM4 FM7 FM9 FM10

DARM2: FM3 FM4 FM5 FM6 FM7 FM8 FM9 FM10

leaving DARM1 FM5,6,8 and DARM2 FM1,2 unused