O1 days 72,73
model restarts logged for Sun 29/Nov/2015 No restarts reported
model restarts logged for Sat 28/Nov/2015 No restarts reported
As Patrick surmised in alog 23788, the lockloss at ~2240 pst Saturday, this lockloss came about after the Tidal signals ultimately driving HEPI hit its ISC imposed limit of 250um about 75 minutes prior.
The attached 1 day trend shows the HPI-ETMX_ISCMON hitting the 250 limit imposed just upstream at the HPI-ETMX_ISCINF filter. HEPI has no problem opening up this relief and I'm sure I should have done so already.
This amount of "Tide" is not real though so something else must be driving the requirement. I suspect an initial acquisition offset that ends up at HEPI or temperature changes either at the ends or in the PSL area? Attached too is a 30 day trend of the 'tidal' drives to the End HEPIs. One other lockloss is attributable to this limit being reached on 10 November.
TITLE: 11/30 DAY Shift: 16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC
STATE of H1: NLN at
Outgoing Operator: TJ
Quick Summary:
TJ mentioned issue with getting the OMC to lock on the carrier during overnight lockloss. He made a change to how the slider sweeps for the carrier in Guardian (will send an email to Kiwamu).
useism is about 0.4um/s in LVEA. Winds are calm (under 10mph). Range is hovering around 75Mpc.
CER temperature has been higher by 5 degrees C than before since 11-27-2015 13:00 UTC-ish (right bottom in the attached). This is a day-ish later than when they started receiving air handler alarms. I notified Richard.
An interesting side effect of this is that I can now see that the output level of RF distribution amplifiers has a small temperature dependence. It's about -0.04dBm/K for 45MHz amplifier in CER (eyeballing right middle and right bottom). This is picked up by the RF AM stabilization (left middle and middle bottom). Not that this is a bad thing in itself.
Also, diode room air conditioning stopped switching on and off repeatedly (middle top) at the same time the CER temperature went up. I notified Peter.
Discussed IFO status:
Substem Reports: Nothing for SEI, SUS, CDS, FACILITIES
Maintenance Activities Tomorrow:
Title: 11/30 OWL Shift: 08:00-16:00UTC (00:00-8:00PDT), all times posted in UTC
State of H1: Observing ~80Mpc for the last 4hrs
Shift Summary: Quiet shift besides one issue after a lockloss from 4.5 in Oklahoma. <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=23821">alog23821</a> describes the OMC issue and my solution.
Incoming Operator: Corey
Activity Log:
Following on from Patrick's entry regarding the reference cavity transmission falling below 0.9 V ... Attached are two plots of the reference cavity transmission and the Laser Room temperature as measured by a sensor on the table, along with an image of the various spots from the pre-modecleaner and reference cavity. Since I didn't save any previous camera image, I will simply have to go on memory. The pre-modecleaner reflected spot looks like it's drifted to the right in yaw (as you look at the image). The reference cavity reflected spot has moved up in pitch. Both alignments were tweaked during last Tuesday's maintenance period. Also attached is a plot of the U100 mirror mount drift due to temperature and similar data from the Newport website for their Suprema series mirror mount. The plots suggest that pitch suffers with any temperature variation, although it's hard to quantify given the ~0.5 degC temperature change. The plot for the U100 mount, suggests that the pitch adjustment does not recover. The degradation in the transmission signal seems to coincide with colder temperatures of late. Prior to last week the last time the alignment was tweaked was mid-July. Another possible reason might be that the reference cavity is slipping in its suspension, for whatever reason. Given the fact that the transmission can almost always be corrected for by a pitch alignment I don't think this is a likely reason. The reference cavity is the same as that used for the Initial LIGO H1 PSL and I do not recall any mention of frequent alignment tweaks to preserve the transmission signal.
Observing 11:58 UTC at 80Mpc.
Had some sissues with finding the 45MHz carrier on the OMC, see alog23821.
Violin modes took a longer time than usual to damp. Wasn't any one in particular, all of them seemed to have started out pretty high.
At ENGAGE_ASC_PART3, I noticed that the OMC_LOCK was not in READY_FOR_HANDOFF. Re-requesting it did not seem to help. There was a notification that it could not find the 45MHz sideband. I went through the code and saw that adjusting the OMC-PZT2_OFFSET slider while watching H1:OMC-PZT2_MON_DC_OUT and H1:OMC-DCPD_SUM_OUT could work. I thought I got it to where it needs to be, I manually moved past the FIND_CARRIER step and all seemed well until DC_READOUT.
The initial voltage scan for the PZT was changed from -30 to -24 on Nov 18, I found the sidebands to be at an offset voltage of 25.25V. Not sure if I even really got it, but perhaps this initial value needs to be changed slightly?
The same issue happened the second time around. This time I changed the start scan voltage back to the original -30V in the guardian. Worked first try. This change has been saved and committed.
Pretty sure a "smaller" earthquake took both us and LLO out. 4.5 26km WSW of Medford, Oklahoma 2015-11-30 09:49:13 UTC
This is seen in all the seismic FOMs as a spike, there doesn't seem to be any residual seismic activity from the quake.
Generic lockloss plot attached.
TITLE: "11/30 OWL Shift: 08:00-16:00 UTC (00:00-08:00 PDT), all times posted in UTC"
STATE Of H1: Observing at 80 Mpc for 7hours.
OUTGOING OPERATOR: Patrick
QUICK SUMMARY: Cold as usual, wind is low, useism = 0.5 um/s, LVEA/VEAs lights off. TPD flashing on Ops Overview, this wasn't noticed until after going into observing but should still be okay.
TITLE: 11/29 [EVE Shift]: 00:00-08:00 UTC (16:00-00:00 PDT), all times posted in UTC STATE Of H1: Observing @ ~ 80 MPc. SHIFT SUMMARY: Quiet since locking at NLN. 45mHz ISI blends made all the difference. Winds have increased slightly to between ~ 0 to 10 mph. Earthquake band has come down slightly to between ~ 0.02 and 0.1 um/s. No significant change in microseism. SUPPORT: Kiwamu INCOMING OPERATOR: TJ ACTIVITY LOG: 00:52 UTC Switched ISI blends to 45mHz 01:12 UTC NLN 01:28 UTC Observing
No problems since going to observing. SUS ETMY saturations on occasion.
The strip chart was freezing on and off and the camera images were frozen. I did not restart the strip chart because it is the same as the one on nuc2.
Kiwamu, Patrick Switching the ISI blends to 45 mHz made all the difference. Accepted the SDF differences for the blends. (See attached screenshots). No problems as soon as we did that. There is a yellow box with 'TPD' written in it flashing in the PSL area of the Ops overview. Kiwamu looked at the medm code and it appears when H1:PSL-FSS_TPD_DC_OUTPUT < 0.9. It is currently around 0.86. There is still a testpoint open on H1LSC.
Good job, you guys!! (And looks like you might have been up to 85Mpc for the first few hours?! Wow.)
TITLE: 11/29 [EVE Shift]: 00:00-08:00 UTC (16:00-00:00 PDT), all times posted in UTC STATE Of H1: Lock acquisition OUTGOING OPERATOR: Corey QUICK SUMMARY: Kiwamu is here and has been working with Corey to help try to relock. From the cameras: The lights are off in the LVEA. The lights are off in the PSL enclosure. I can not tell if the lights are on or off at mid X and mid Y. The lights are off at end X. The lights are off at end Y. The 0.03 - 0.1 Hz (earthquake) seismic band is between ~ 0.02 and 0.1 um/s. The 0.1 - 0.3 Hz (microseism) seismic band is between ~ 0.2 and 0.8 um/s. The winds are between ~ 0 and 5 mph. The ISI blends are on Quite_90. From pinging: CDS WAP is off at the LVEA. CDS WAP is on at mid X. CDS WAP is on at mid Y. CDS WAP is off at end X. CDS WAP is off at end Y.
TITLE: 11/29 DAY Shift: 16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC
STATE of H1: Lock Acquisition
Incoming Operator: Patrick
Support: Kiwamu over the phone and then
Quick Summary:
Rough shift which hopefully just related to issues with alignment (i.e. input pointing restoration?). Right now we are waiting to see how H1 proceeds through lock aquisition. Kiwamu has been here to help & is here to assist Patrick.
Shift Log:
