TITLE: 11/07 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.21 μm/s
QUICK SUMMARY:

H1's not made it back to NLN over 24 hrs (with a low duty cycle overall this week[s]).  A quick glance shows ALSy is not stable as seen yesterday afternoon.  Just chatted with Sheila and she suggested checking stability of the PMC overnight after the PSL NPRO Freq temperature change from yesterday.

Microseism did increase a bit in the last 24hrs, but has also come back down to where it was about 18hrs ago; very low winds.

The Ops Work Station (cdsws29) had a bad "left" monitor (started flickering yesterday)---Jonathan is replacing it now.

Attached is a roughly 19 hour trend, going back to relocking the PMC/ISS/FSS after yesterday's NPRO crystal temperature tuning.  As can be seen, there were no excursions in PMC Refl above 18 W, and no sudden drops in the ISS diffracted power % or sudden ISS unlocks, a clear change from the last several days.  We will continue to monitor this, but so far it looks like the new NPRO is much happier with this new crystal temperature.

Tony texted me at 10PM and warned me of an unstable ALSY lock. After resding the alogs and enacting the changes that him and Keita made to manage to lock Y, I was still having issues.

For context, the ALSY laser had maintenance early today and since then has been having either multimode locking issues or more general laser performance issues according to Daniel. To tackle this, Keita and Tony lowered the ALSY locking thresholds in order to make it past ALS and while this worked once, was not repeatable. Their alogs: alog 81116, alog 81114. After some flailing, I decided to call for help.

Daniel came online and began to dianose the ALSY issues. The first guess was that it was a multimode issue, to which he began to change the ALS frequency to test it out. The final conclusion is that it's some tuning error where ALSY doesn't operate stably in its current frequency since being adjusted to PSL freq. Daniel's Alog 81117. Final recommendation is that corrective maintenance needs to be done on-site at EY. Since this is not possible now, with Daniel's recommendation, IFO will remain in LOCKING_ARMS_GREEN until tomorrow's DAY shift.

The laser in EY looks unstable. It may be multimode.

The first attached plot shows the ALSY locking attampts over the past day. The laser was adjjusted to the new PSL frequency about 10 hours ago. Afterwards there is a distinct variation in the green output accompanied by a smaller inverse change of the red power. In the past 6 hours good ALS locks (red trace near +1.0) are correlated with the lower green power states. At higher green p[owers we seem to be locking a intermediate transmitted powers indicating the possibility of a multimode laser.

The second attached plot shows how changing the frequency of the laser changes the green and red powers. The green power varies much between -600 and +400MHz and seems to be stable outside this region.

We need to try adjusting the pump diode current and crystal temperature and see if we can resolve it this way.

TITLE: 11/07 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:
ALS-Y is not correct and is very time consuming to trick into working correctly.
Please see alog https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=81114

Once locking , I took ISC_LOCK to Green arms manual, Keita lowered the Threshold even further:  H1:ALS-Y_REFL_LOCK_TRANSPDNORMTHRESH -> 0.40 which is even lower than initial alignmnet. We did this because the Diff beatnote that we were seeing was -41 dbm
We also increased the gain H1:ALS-Y_REFL_LOCK_LOCKEDGAIN from 6 to 12.

Line 921 in ALS_ARM.py was changed:
if ezca['ALS-C_TR%s_A_LF_OUT16'%self.arm] < 0.5: # WAS Changed From 0.5 to 0.3
We then just waited and eventually it went to LOCKING_ALS !
I then reverted all my changes in ALS_ARM.py and save and reloaded ALS-Yarm as soon as we made it past Locking ALS.

Got all the way up to LOW_NOISE_ETMX[558] before some oscillation seen on ASC Chard P inmon unlocked it again.

The IFO is still very difficult to lock beyond ALS-Y, See the attachment for help finding these channles.

LOG:
Keita went out on the floor to work on the Lockloss Monitor.

Right after the ALSY laser was adjusted earlier today, IR power went down (right column, 2nd from the top) while the green power went up significantly (left column 2nd from the top) and started drifting significantly. There are times when green Y transmission cannot go more than 0.45 or so even when the arm was free swinging despite the higher green power. It doesn't seem as if the problem is not alignment.

Interestingly, last two times when Y arm locking was good (i.e. green transmission divided by the green laser power was reasonable) were when IR output of the laser peaked and the green output went down to the previous power level.

TITLE: 11/07 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 4mph 3min avg
    Primary useism: 0.09 μm/s
    Secondary useism: 0.23 μm/s
QUICK SUMMARY:

Earthquake may have interupted the Initial alignment that was done just before my shift.

Reverted the Y arm to the OSEM values we had before our lockloss.

Reverting All but SQZ  to last second of the last good Initial Alignment: 1414909471

Before: SUS-IM1_M1_OPTICALIGN_P_OFFSET: 427.4,
After: SUS-IM1_M1_OPTICALIGN_P_OFFSET: 427.4,
Before: SUS-IM1_M1_OPTICALIGN_Y_OFFSET: -384.8,
After: SUS-IM1_M1_OPTICALIGN_Y_OFFSET: -384.8,
Before: SUS-IM2_M1_OPTICALIGN_P_OFFSET: 706.7,
After: SUS-IM2_M1_OPTICALIGN_P_OFFSET: 706.7,
Before: SUS-IM2_M1_OPTICALIGN_Y_OFFSET: -178.3,
After: SUS-IM2_M1_OPTICALIGN_Y_OFFSET: -178.3,
Before: SUS-IM3_M1_OPTICALIGN_P_OFFSET: -232.8,
After: SUS-IM3_M1_OPTICALIGN_P_OFFSET: -232.8,
Before: SUS-IM3_M1_OPTICALIGN_Y_OFFSET: 333.5,
After: SUS-IM3_M1_OPTICALIGN_Y_OFFSET: 333.5,
Before: SUS-IM4_M1_OPTICALIGN_P_OFFSET: -85.2,
After: SUS-IM4_M1_OPTICALIGN_P_OFFSET: -87.0,
Before: SUS-IM4_M1_OPTICALIGN_Y_OFFSET: 392.2,
After: SUS-IM4_M1_OPTICALIGN_Y_OFFSET: 391.5,
Before: SUS-RM1_M1_OPTICALIGN_P_OFFSET: -729.8,
After: SUS-RM1_M1_OPTICALIGN_P_OFFSET: -723.6,
Before: SUS-RM1_M1_OPTICALIGN_Y_OFFSET: 180.9,
After: SUS-RM1_M1_OPTICALIGN_Y_OFFSET: 181.2,
Before: SUS-RM2_M1_OPTICALIGN_P_OFFSET: -48.0,
After: SUS-RM2_M1_OPTICALIGN_P_OFFSET: -32.6,
Before: SUS-RM2_M1_OPTICALIGN_Y_OFFSET: 318.3,
After: SUS-RM2_M1_OPTICALIGN_Y_OFFSET: 303.7,
Before: SUS-MC1_M1_OPTICALIGN_P_OFFSET: 833.3,
After: SUS-MC1_M1_OPTICALIGN_P_OFFSET: 833.3,
Before: SUS-MC1_M1_OPTICALIGN_Y_OFFSET: -2230.6,
After: SUS-MC1_M1_OPTICALIGN_Y_OFFSET: -2230.6,
Before: SUS-MC2_M1_OPTICALIGN_P_OFFSET: 591.5,
After: SUS-MC2_M1_OPTICALIGN_P_OFFSET: 591.5,
Before: SUS-MC2_M1_OPTICALIGN_Y_OFFSET: -580.4,
After: SUS-MC2_M1_OPTICALIGN_Y_OFFSET: -580.4,
Before: SUS-MC3_M1_OPTICALIGN_P_OFFSET: -20.3,
After: SUS-MC3_M1_OPTICALIGN_P_OFFSET: -20.3,
Before: SUS-MC3_M1_OPTICALIGN_Y_OFFSET: -2431.1,
After: SUS-MC3_M1_OPTICALIGN_Y_OFFSET: -2431.1,
Before: SUS-PRM_M1_OPTICALIGN_P_OFFSET: -1627.6,
After: SUS-PRM_M1_OPTICALIGN_P_OFFSET: -1636.9,
Before: SUS-PRM_M1_OPTICALIGN_Y_OFFSET: 622.9,
After: SUS-PRM_M1_OPTICALIGN_Y_OFFSET: 616.7,
Before: SUS-PR2_M1_OPTICALIGN_P_OFFSET: 1553.5,
After: SUS-PR2_M1_OPTICALIGN_P_OFFSET: 1549.5,
Before: SUS-PR2_M1_OPTICALIGN_Y_OFFSET: 2812.8,
After: SUS-PR2_M1_OPTICALIGN_Y_OFFSET: 2808.5,
Before: SUS-SRM_M1_OPTICALIGN_P_OFFSET: 2509.1,
After: SUS-SRM_M1_OPTICALIGN_P_OFFSET: 2519.6,
Before: SUS-SRM_M1_OPTICALIGN_Y_OFFSET: -3801.7,
After: SUS-SRM_M1_OPTICALIGN_Y_OFFSET: -3810.4,
Before: SUS-OM1_M1_OPTICALIGN_P_OFFSET: -73.9,
After: SUS-OM1_M1_OPTICALIGN_P_OFFSET: -74.7,
Before: SUS-OM1_M1_OPTICALIGN_Y_OFFSET: 686.7,
After: SUS-OM1_M1_OPTICALIGN_Y_OFFSET: 686.1,
Before: SUS-OM2_M1_OPTICALIGN_P_OFFSET: -1460.3,
After: SUS-OM2_M1_OPTICALIGN_P_OFFSET: -1448.3,
Before: SUS-OM2_M1_OPTICALIGN_Y_OFFSET: -254.3,
After: SUS-OM2_M1_OPTICALIGN_Y_OFFSET: -307.4,
Before: SUS-OM3_M1_OPTICALIGN_P_OFFSET: -1095.0,
After: SUS-OM3_M1_OPTICALIGN_P_OFFSET: -1095.0,
Before: SUS-OM3_M1_OPTICALIGN_Y_OFFSET: -212.0,
After: SUS-OM3_M1_OPTICALIGN_Y_OFFSET: -212.0,
Before: SUS-OMC_M1_OPTICALIGN_P_OFFSET: 36.9,
After: SUS-OMC_M1_OPTICALIGN_P_OFFSET: 36.9,
Before: SUS-OMC_M1_OPTICALIGN_Y_OFFSET: 0.0,
After: SUS-OMC_M1_OPTICALIGN_Y_OFFSET: 0.0,
Before: SUS-ITMX_M0_OPTICALIGN_P_OFFSET: -104.4,
After: SUS-ITMX_M0_OPTICALIGN_P_OFFSET: -101.1,
Before: SUS-ITMX_M0_OPTICALIGN_Y_OFFSET: 109.2,
After: SUS-ITMX_M0_OPTICALIGN_Y_OFFSET: 109.3,
Before: SUS-BS_M1_OPTICALIGN_P_OFFSET: 97.4,
After: SUS-BS_M1_OPTICALIGN_P_OFFSET: 97.6,
Before: SUS-BS_M1_OPTICALIGN_Y_OFFSET: -396.5,
After: SUS-BS_M1_OPTICALIGN_Y_OFFSET: -396.3,
Before: SUS-ITMY_M0_OPTICALIGN_P_OFFSET: -1.5,
After: SUS-ITMY_M0_OPTICALIGN_P_OFFSET: -4.5,
Before: SUS-ITMY_M0_OPTICALIGN_Y_OFFSET: -20.1,
After: SUS-ITMY_M0_OPTICALIGN_Y_OFFSET: -19.1,
Before: SUS-ETMX_M0_OPTICALIGN_P_OFFSET: -35.8,
After: SUS-ETMX_M0_OPTICALIGN_P_OFFSET: -37.1,
Before: SUS-ETMX_M0_OPTICALIGN_Y_OFFSET: -146.7,
After: SUS-ETMX_M0_OPTICALIGN_Y_OFFSET: -146.6,
Before: SUS-ETMY_M0_OPTICALIGN_P_OFFSET: 159.2,
After: SUS-ETMY_M0_OPTICALIGN_P_OFFSET: 157.5,
Before: SUS-ETMY_M0_OPTICALIGN_Y_OFFSET: -165.7,
After: SUS-ETMY_M0_OPTICALIGN_Y_OFFSET: -165.1,
Before: SUS-TMSX_M1_OPTICALIGN_P_OFFSET: -93.1,
After: SUS-TMSX_M1_OPTICALIGN_P_OFFSET: -96.7,
Before: SUS-TMSX_M1_OPTICALIGN_Y_OFFSET: -96.4,
After: SUS-TMSX_M1_OPTICALIGN_Y_OFFSET: -98.7,
Before: SUS-TMSY_M1_OPTICALIGN_P_OFFSET: 75.5,
After: SUS-TMSY_M1_OPTICALIGN_P_OFFSET: 73.8,
Before: SUS-TMSY_M1_OPTICALIGN_Y_OFFSET: -265.9,
After: SUS-TMSY_M1_OPTICALIGN_Y_OFFSET: -267.7,

ALS X looks worse and ALS Y doesnt seem to change much at all.
Ground motion is falling.

Reverted back to a better time: 1414970755

TITLE: 11/06 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

Since there were issues with locking last night/this morning, the main activity of the day was tuning the PSL NPRO crystal temperature again (this was done yesterday during maintnenance).  

Attempted locking toward the end of the shift, but had some issues with ALSy---trans power has only been about 0.8 (earlier in the day we were at 0.9).  It also goes into stretches of troubles during locking.  Tony touched up the alignment and it was able to offload its alignment, but then there was a note about "waiting for PLL DIFF".  Currently trying another alignment.
LOG:

• 1508 lockloss Earthquake 
  • 1533 Initial Alignment started automatically
  • PMC mode hopping  made IMC locking tough.  Took H1 to DOWN/IDLE
  • 1746 Lockloss while holding at 10W
  • 1809 H1 taken to IDLE for PSL rack work (jason, vicky)
• 1602-1640 Quick job shadow tour for Michael (senior from Boardman area) (neil)
• 1645-1005 Camilla covering my tour while I took job shadow to fiber lab
• 1600-1707 Mitch back from FAMIS
• 1620-1647 Optics lab clean (karen)
  • Also MY, woodshop
• 1714-1725 CER checks (Robert)
• 1810-2040 PSL racks (jason, vicky)
• 1818-1822 LVEA (travis)
• 2059-2239 ground injection set-up (robert)
• 2150-2240 Tuning ALS/SQZ lasers after today's new PSL freq change (Vicky, Daniel)
• 2220-2229 Peak inside ISCT1 (corey)
• 2245 Initial Alignment started.
• 2310 Incoming EQ from Mariana Islands
• After alignment went for locking but there was also the EQ.  ALSy had troubles with locking.  Eventually felt the issue of aligning during the EQ could have caused some grief.  Right now Tony is running a new Initial Alignment to see if this helps out ALSy.

V. Xu, J. Oberling

With the PSL NPRO still showing signs of mode hopping, after consulting with Sheila via TeamSpeak it was decided to stop locking attempts and go out to the PSL racks to tune the NPRO crystal temperature to see if we could find a mode hop free region.  I wasn't too familiar with what we were looking for here but Vicky is, so she kindly agreed to lend a hand.  We grabbed an oscilloscope from the EE shop, some Lemo cables and adapters, and out we went.

We wanted to scan the PMC through a complete FSR so we could watch the mode content while we changed the NPRO crystal temperature.  To do this we unplugged the DC cables for PMC Trans and Refl from the PSL Monitoring Fieldbox and plugged them into the oscilloscope.  We also plugged a cable into the 50:1 HV monitor so we could trigger off of the PMC PZT ramp.  For the ramp we used the Alignment Ramp on the PMC MEDM screen, set to +/- 7V at 1 Hz.  Once we got the signals on the scope and successfully triggered, we clearly had a full FSR visible so we kept these ramp settings.  We watched things for a little bit before starting adjustments and noticed the laser frequency drift a little bit; Vicky estimated this at 1-3 GHz in 30 minutes.

We began at the crystal temperature where we left it yesterday (25.2 °C) and used the temperature control on the FSS MEDM to step the temperature down.  At ~24.85 °C we started to see clear mode hopping behavior in the scan, which got worse at 24.75 °C, see first attachment.  We had originally set the crystal temperature to 24.7 °C, so clearly we started in a mode hopping region.  We continued moving the temperature down to see where the mode hop region ended; the scan didn't start looking good again until ~24.5 °C.  We continued moving the temperature down until we maxed the slider.  This had the crystal temperature at 23.95 °C and we were still mode hop free.  So we started moving the temperature up to start mapping out the upper region (>25.2 °C).  When started seeing the bad mode hopping region right above 24.5 °C, so this matches with where we saw things on the way down.  However, it didn't clear up until the temperature was >25.1 °C, uncomfortably close to our starting value of 25.2 °C.  It looks like the spot we locked the RefCav at yesterday was right on the edge of a mode hopping region, and we had been slowly drifting in and out of it.  We continued to move the temperature up via the MEDM slider unil it maxed at a crystal temperature of 25.49 °C and saw no mode hopping behavior.  The second attachment shows some pictures from both of these good regions.

The slider was maxed but we wanted to continue mapping the upper region, especially as this area is closer to the operating temperature of the NPRO we just removed from the PSL (meaning the SQZ and ALS lasers had been happily locked in this area for all of O4 to date).  To do this we set the slider back to 0 (a crystal temperature of ~24.7 °C) and used the knob on the front panel of the NPRO power supply to adjust the crystal temperature.  We moved slowly while watching the power out of the amplifiers and NPRO, in case the temperature adjustment caused beam changes that had a negative effect on amp output.  In this way we moved the crystal temperature up to 26.75 °C and saw no mode hopping behavior.  We did, however, start to see the power out of the amplifiers drop a little.  At a crystal temperature of 26.75 °C we lost roughly 3 mW from the NPRO, ~0.5 W from Amp1, and ~1 W from Amp2.  3 mW from the NPRO results in about 0.25 W lost at Amp2, so most of the loss is likely due to mode changes in the NPRO beam caused by the different operating temperature (if this was alignment we would have lost power a good bit faster, mode matching changes I've observed are generally a good deal slower than alignment changes).  Because of this we stopped here, and set the crystal temperature to ~26.27 °C.  Still had ~139.0 W output from Amp2, so all is well here.

We then plugged everything back in and relocked the PMC; it locked without issue.  We then adjusted the crystal temperature down via the MEDM slider to find a RefCav resonance.  We did have one time where the PMC unlocked when the PZT ran out of range (the PMC PZT moves to keep the PMC locked while the laser frequency changes).  We couldn't see a 00 coming through on the PMC ramp, so we moved the crystal temperature back up until a 00 was clearly visible flashing through; at this point the PMC locked without issue.  Continuing to move the temperature down we found a RefCav resonance flash through at a crystal temperature of 26.26 °C, so we locked the RefCav.  It took a couple of passes to grab the lock (had to disable the FSS Guardian to keep it from yanking the gains around), but it did lock.  The final crystal temperature was 26.2 °C.  To finish we locked the ISS, grabbed our equipment, and left the LVEA.

We left things here for an hour and saw no signs of mode hopping again, so Daniel and Vicky started tuning the ALS and SQZ lasers to match the new NPRO frequency.  Time will tell whether or not we are in a better place in regard to NPRO mode hopping, but results so far are promising.

Closes FAMIS#28454, last checked 80607

CO2 trends looking good (ndscope1)

HWS trends looking good (ndscope2)

You can see in the trends when the ITMY laser was swapped about 15-16 days ago.

Closes FAMIS#26316, last checked 80936

Laser Status:
    NPRO output power is 1.9W (nominal ~2W)
    AMP1 output power is 68.62W (nominal ~70W)
    AMP2 output power is 138.7W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 0 days, 0 hr 25 minutes
    Reflected power = 17.47W
    Transmitted power = 108.7W
    PowerSum = 126.2W

FSS:
    It has been locked for 0 days 0 hr and 25 min
    TPD[V] = 0.8925V

ISS:
    The diffracted power is around 3.6%
    Last saturation event was 0 days 0 hours and 33 minutes ago

Possible Issues:
    ISS diffracted power is high

Currently, Jason and Vicky are out on the floor for rack measurements and possible new laser frequency change (which will require changes for the ALS & SQZ lasers).

WP 12139

Entry for work done on 11/5/2024

Two 3T seismometers were installed in the LVEA Biergarten next to the PEM area. Signals are routed through the SUS-R3 PEM patch panel into the CER. Signals are connected to PEM AA chassis 4 and 5.

F. Clara, J. Warner

I've roughly copied the LLO configuration for the AS power monitor (that won't saturate after lock losses) and installed an additional photodiode in the AS_AIR camera enclosure. PD output goes to H1:PEM-CS_ADC_5_19_2K_OUT_DQ for now.

GiGE used to receive ~40ppm of the power coming into HAM6. I replaced the steering mirror in front of GigE with 90:10, the camera now receives ~36ppm and the beam going to the photodiode is ~4ppm. But I installed ND1.0 in front of the PD, so the actual power on PD is ~0.4ppm.

See the attached cartoon (1st attachment) and the picture (2nd attachment).

Details:

1. Replaced the HR mirror with 90:10 splitter (BS1-1064-90-1025-45P), roughly kept the beam position on the camera, and installed a Thorlabs PDA520 (Si detector, ~0.3AW) with OD1.0 absorptive ND filter in the transmission. I set the gain of PDA520 to 0dB (transimpedance=10kOhm).
2. Reflection of the GigE was hitting the mirror holder of 90:10, so I inserted a beam dump there. The beam dump is not blocking the forward-going beam at all (3rd attachment).
3. Reflection of the ND filter hits the black side panel of the enclosure. I thought of using a magnetic base, but the enclosure material is non-magnetic. Angling the PD to steer the reflection into the beam dump for GigE reflection is possible but takes time (the PD is in a inconvenient location to see the beam spot).
4. Fil made a custom cable to route power and signal through the unused DB9 feedthrough on the enclosure.  Pin 1 = Signal, Pin 6 = Signal GND, Pin 4 = +12V, Pin 5 = -12V, Pin 9 = power GND. (However, the power GND and signal GND are connected inside the PD.) All pins are isolated from the chamber/enclosure as the 1/2" metal post is isolated from the PD via a very short (~1/4"?) plastic adapter.
5. Calibration of this channel (using ASC-AS_C_NSUM) seems to be about 48mW/Ct.