With a fairly light and non-invasive Maintenance Day, able to turn on Sensor Correction, begin LVEA sweep, and run an alignment at around 1830utc (1130pdt). For the alignment, X-arm was stuck in Increase Flashes a bit so Jenne manually addressed this; ALSx green power was a still a bit low max-ing out at 0.65 (similar to what Oli noted during the windstorm last night). But other than that, the rest of alignment was fully automated. And H1 made it to NLN fully-automated with no issues. Range (in the first few minutes is hovering just under 150Mpc as we join L1 & V1 in OBSERVING.
This morning I took the OPLEV charge measurements on both ETMX and ETMY suspensions. I will post the results below after processing the data.
Both the suspensions were restored to their nominal state after the measurements were complete.
Karmeng, Terry
First figure shows the cavity "mode" when it was first assemble. Single pass power measurement shows 5% loss in the crystal (without mirrors). Based on the cavity parameter, the 500% increase in cavity linewidth is caused by 40% loss in the cavity.
We then tried to assemble a cavity without a crystal while using a mirror mount (the reduced cavity length from the removal of crystal is compensated by increasing the separation between both mirrors). The cavity forms good modes.
A new crystal from box labeled "4" was used on a new block, able to form a cavity with the new crystal.
Next step: make a cavity with mirror 2 (back mirror) on the block.
[Jenne, Sheila]
We did a quick check of how much SR2 needs to move in order to reduce the amount of power on AS_C_NSUM by 50%, in hopes that this will help us and Alena check the calibration of the SR2 sliders, for use in Alena's model.
I left the PSL power at 2W. Both ETMs are in use, but the yarm is misaligned enough that it was fine to use ITMY as my single-bounce optic without getting IR flashes. So, I misaligned ITMX and indeed see no IR arm flashes that would confuse my measurement.
I by-hand moved SR2 to center on AS_C so that I had a known starting place (the rest of the IFO hasn't been aligned in the last few hours, and seismic sensor correction is off for maintenance day, which is probably why I needed to move a very small amount to get AS_C centered).
I then moved SR2 up in pitch until the AS_C_NSUM was reduced by 50%, from 0.0045 to 0.00225 (the y-axis cursors on the _NSUM plot attached). I went back to center, repeated for the opposite direction in pitch, then again back to center and checked the two yaw directions.
With these slider and OSEM values, along with Alena's model and Minhyo's finding that the AS_C QPD is 3mm wide, we should be able to check the slider calibration. The thought is that since we've found the slider values at which the NSUM value drops by 50%, that's roughly similar to being able to say that the center of the gaussian beam is at the very edge of the diode.
SR2 P slider | SR2 Y slider | Slider change | |
AS_C centered | -5.9 | 2066.9 | N/A starting position |
AS_C Nsum 50% +pitch | 154.1 | 2066.9 | +160 in pitch |
AS_C Nsum 50% -pitch | -153.9 | 2066.9 | -148 in pitch |
AS_C Nsum 50% -yaw | -5.9 | 1918.9 | -148 in yaw |
AS_C Nsum 50% +yaw | -5.9 | 2154.9 | +88 in yaw |
I'll note that the +yaw slider change is dramatically different from the other 3, so we must be hitting something different. I did double-check, and I get the same answer of 50% reduction in AS_C_NSUM when the SR2 yaw slider goes to 2154.9, so it's not a typo. The beam is starting to fall off of the AS_C camera for that position, so I can't really say if things are qualitatively different in the beam shape between the two yaw extrema. I didn't check what the beam shape looked like for the pitch extrema either.
EDIT: I forgot to add my screenshot. The Y-cursors for the purple AS_C plot in the 3rd row to be the nominal AS_C_NSUM value, and the 50% value. The y-cursors for the other plots are the slider values at the 50% NSUM points.
EDIT EDIT: Anamaria reminds me that it's possible that we could also be clipping somewhere in the path behind OM1 on the way to AS_C. That's a little hard to check, and I think the beam motion back there should be fairly small, but it's something to be mindful of.
We ran the functionality test on the main turbopumps in MY and EY. The scroll pump is started to take pressure down to low 10^-02 Torr, at which time the turbo pump is started, the system reaches low 10^-08 Torr after a few minutes, then the turbo pump system is left ON for about 1 hour, after the hour the system goes through a shut down sequence.
MY Turbo:
Bearing Life:100%
Turbo Hours: 214
Scroll Pump Hours: 78
EY Turbo:
Bearing Life:100%
Turbo Hours: 1282
Scroll Pump Hours: 78
No issues encountered for either turbopump
Tue May 14 10:15:12 2024 INFO: Fill completed in 15min 8secs
Gerardo confirmed a good fill curbside.
I checked the Kepco power supplies located at the corner station CER Mezanine.
Rack C1 - Temps < 72F, no vibrations
Rack C2 - Temps < 72F, no vibrations
Rack C3 - Temps < 72F, no vibrations
Rack C4 - Temps < 72F, no vibrations
Rack C5 - Temps < 72F, (U5-U7 PSL +/- 18V minor vibration noted)
Rack C6 - Temps < 72F, no vibrations
The minor vibration on C5:U5-U7 is not major enough to warrant action, just keep an eye on this one, both supplies running old fans.
The recent alignment shift in the IFO's output arm caused the SR3 optical lever beam to fall off of its QPD, so I re-centered it this morning. I found the OpLev with the following readings:
The SUM counts are very low (usual is just over 20k), indicating the OpLev beam was barely on its QPD. In fact, as I adjusted the horizontal translation stage the yaw reading went further positive to ~31 µrad before moving towards 0. The OpLev is now re-centered with a normal SUM count reading, see attached picture. This closes LHO WP 11861.
TITLE: 05/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 17mph Gusts, 14mph 5min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.12 μm/s
QUICK SUMMARY:
H1 dropped out of Observing a few min ago for magnetic injections---this must be the reason for the handful of SDF defs for PEM (and there was a superevent at 1217utc).
Summary of Activities For Maintenance:
LVEA is laser SAFE! (thanks for checking Betsy!)
Workstations were updated and rebooted. This was an update to OS packages. Conda packages were not updated.
IFO is now in NLN and OBSERVING as of 10:01 UTC
Ran initial alignment - consequent lock was fully automatic.
TITLE: 05/14 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: After the lockloss from wind an hour into my shift, I have been trying to get us back up every time the wind has started to go down but ALSX was having trouble getting above 0.4; I ended up moving ITMX as well as TMX/EX. The wind wasn't reasonable until 07:00 UTC, and I was able to slowly get ALSX above 0.65 by 07:20 UTC, and 0.72 twenty minutes later.
Once Ibrahim got on, he wanted to try running INCREASE_FLASHES, and it was able to catch ALSX at 0.7, and it's just sitting there now. Did something happen today that changed it from being >=1? Ibrahim is running an initial alignment now.
LOG:
23:00 Detector Obseving and Locked for 6.5 hours
00:23 Went to GREEN_ARMS_MANUAL because Increase Flashes wasn't helping and it wanted me to find ALSX by hand
00:46 Took detector to DOWN to ride out the high wind
02:34 Started trying to relock because wind was down to 30mph
- Couldn't get ALSX over 0.49 after multiple rounds
- Ended up moving ITMX, which helped and then we maxed out at 0.6, and wind was picking up
04:06 Couldn't get ALSX still, wind increased to >40mph, so back to DOWN
06:30 Winds lower, trying relocking again
Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
---|---|---|---|---|---|---|
21:34 | SQZ | Terry, Kar Meng | Opt Lab | Local | SHG work | 00:20 |
00:44 | PCAL | Franscisco | PCAL Lab | yes(local) | Preparing things | 01:10 |
Ibrahim, Oli
Starting IFO locking troubleshooting - Oli called me at the end of their shift and filled me in on the ALSX issues we've been having due to severe winds. Now that winds have calmed down, we are attempting relocking.
Still not locked due to wind - it's at ~35mph right now. I started trying to lock half an hour ago and have been able to get ALSY to lock but I haven't been able to get ALSX flashes above 0.49. The values are also fluctuating quite a bit due to the wind, but I might try moving ITMX since multiple rounds of ETM/TMSX haven't helped.
Taking us back to DOWN due to wind increasing to >40mph; I'm still not able to get ALSX over 0.6 but we'll let the wind go down a bit and then continue
Closes FAMIS#26466, last checked 77434
EY_CTRL_OUTPUT has started rising over the past week, and EY_PS_PRESS1_PSI has been much noisier since April 11th, when the ETMY HEPI pump tripped (77112).
Pretty confident that this was due to the wind - it really jumped up this past 1/2 hour
Winds currently hitting 40mph and up to 45mph at EY. Going to try relocking for a bit
00:46 Sitting in DOWN until the wind reduces - ALS wouldn't catch
ETMY's charge appears to be increasing on LL and UL and is just above 50 V. ETMX looks to be mostly constant.