 Thu May 29 08:43:34 2014, manasa, Update, PEM, Ant season already in
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Ant season has set in. I spotted and killed a few ants around the optics
and the enclosure of the PSL table yesterday. TIme for our pest control crew to get busy! |
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Wed Jun 11 08:57:49 2014, Steve, Update, PEM, air cond maintenance tomorrow morning
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Quote:
The 4th week of no wet mopping of the floor and no wet wiping the vacuum envelope. |
 Thu Jun 19 17:11:52 2014, steve, Update, PEM, it is warmer today 
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| The PSL HEPA was running at 30VAC-variac. It is 1 degree C warmer than usual. The HEPA fan motor turned up to 60 V |
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Wed Jul 2 11:32:44 2014, Jenne, TaraV, Update, PEM, Status of seismometer stations, Yend Guralp moved
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[Jenne, TaraV]
We had a look this morning at the status of the seismometer array, so that we can get it all put together. While we were looking at the Guralp
at the Yend, we noticed that it was pointing the wrong way. The North-South nubbins were pointed East-West, so X and Y coming out of the seismometer |
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Mon Jul 7 16:39:26 2014, Steve, Update, PEM, ants on the PSL table
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Quote:
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Tue Aug 12 13:31:58 2014, Jenne, Update, PEM, Seismometer cables in place, ready for sensors
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[TaraV, Jenne]
The short cable from the slab to the sensor has been assembled and installed for the Trillium slab at the corner station. The corner still
needs the sensor and the long cable, both of which are in use by the gyro experiment. |
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Mon Sep 22 10:18:58 2014, steve, Update, PEM, lab temperatures
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Thu Sep 25 11:38:47 2014, Jenne, Update, PEM, Seismometers in place
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[Zach, Jenne, Steve]
This work happened on Tuesday. Bad Jenne for forgetting to elog it!
Zach brought the 40m's seismometers back (one Guralp and one T-240). We have set the seismometers on their slabs. Also, we ran the |
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Thu Oct 2 14:36:52 2014, steve, Update, PEM, oil drops on vertex crane
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Quote:
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Tue Nov 4 10:40:46 2014, steve, Update, PEM, lab temperatures and particle counts
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Thu Nov 13 22:52:48 2014, kate, Update, PEM, Seismometers set up for huddle test
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Jenne, Diego, Kate
We want to conduct a huddle test with the three 40m seismometers (2 Guralps and 1 Trillium), so we began to get that set up in order. All three
are currently sitting on the large granite slab approximately halfway down the length of the MC tube. We had to move all three seismometers: the Trillium |
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Sat Nov 15 21:51:09 2014, rana, Update, PEM, Seismometers set up for huddle test
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In order to do high quality huddle subtraction, we need to align the seismometer axes to high precision. We would need 1000x subtraction
to see the instrument noise floor, but are likely to only get 100x. For that we need to align the axes to 0.5 deg (or do a Wiener coordinate transform
with the data). To do this, we need to use a high quality bubble level and eventually iterate after trying out. |
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Mon Dec 8 09:03:49 2014, steve, Update, PEM, air cond maintenance tomorrow morning
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AC maintenance is scheduled from 8am till 11am tomorrow morning. |
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Wed Dec 10 14:26:13 2014, steve, Update, PEM, air cond maintenance and particle plot
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Quote:
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Fri Dec 12 10:38:22 2014, Steve, Update, PEM, leaky roof
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| The first real rain of this year finds only one leak at the 40m |
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Tue Jan 20 09:32:19 2015, Steve, Update, PEM, dusty Monday morning
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Yesterday morning was dusty. I wonder why?
The PRM sus damping was restored this morning. |
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Mon Jan 26 13:07:28 2015, Jenne, Update, PEM, Seismometers back in nominal places
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I have just put the seismometers back into their nominal positions, on the concreted slabs. The T-240 is in the vertex, and the 2 Guralps are at
the end stations.
The vertex location doesn't have a spaghetti pot right now. There is an aluminum support for cable trays that is welded to the supports |
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Wed Jan 28 08:53:01 2015, Steve, Update, PEM, Seismometer Vertex is covered
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Quote:
I have just put the seismometers |
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Wed Feb 4 19:21:45 2015, Jenne, Update, PEM, Seismometer Vertex is covered
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I opened up the spaghetti pot over the vertex seismometer, and taped the cable to the slab. The way the cable is coiled, it was touching the underside
of the seismometer. Now the only connection is at the cable connector. There is a ~few inch bit of cable, then it's taped down. |
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Fri Feb 6 10:03:23 2015, Steve, Update, PEM, dusty days
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Quote:
Yesterday morning was |
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Tue Mar 3 02:43:06 2015, Jenne, Omnistructure, PEM, No heat??
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It's super cold in the control room and EE bench area tonight. I'm wondering if, similar to what happened on Dec 29th (http://nodus.ligo.caltech.edu:8080/40m/10846)
the campus steam is off? Or just our heater is broken? The thermostat is cranked up to 80 over by the bathrooms (this is usually ~74F), but
we're still cold. |
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Tue Mar 3 04:43:12 2015, Jenne, Omnistructure, PEM, Ottavia is dead?
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After some searching, including help from 4 security guys (I think they don't have a lot to do at 4:30am :), we found that Ottavia is super warm, and smelled burn-y. She has been powered down and unplugged.
Security guys may call Steve's desk to follow up later today. |
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Wed Apr 1 10:50:59 2015, Steve, Update, PEM, construction ahead
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The 40m fenced area will start storing this large ~ 8000 lbs chamber on April 14. The asphalt will be cut, jack hammered the next 2-3 days in order to
lay concrete.
Their schedule is from 8 to 5 starting tomorrow. We are asking them to work from 6 to 3pm |
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Mon Apr 6 09:13:49 2015, Steve, Update, PEM, jackhammering at ETMX
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Quote:
The 40m fenced area will
start storing this large chamber on April 14. The asphalt will be cut, jack hammered the next 2-3 days in order to lay concrete. |
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Mon Apr 6 13:23:40 2015, rana, Update, PEM, jackhammering at ETMX
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Unfortunately, this kind of trend plot is not detailed enough to know if something has gone bad in a quantitative way. But at least we can tell that
the suspension wire didn't break. |
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Tue Apr 7 04:17:42 2015, Jenne, Update, PEM, jackhammering at ETMX
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Q is writing the locking elog for the night, but just to reply to this thread: The IFO worked well tonight, so things are at least not broken.
Quote:
Unfortunately, this kind |
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Thu Apr 9 07:41:22 2015, Steve, Update, PEM, jackhammering at ETMX
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There was a period of short unexpected jackhammering this morning. I asked them to stop.
The good mood of GTRX was not changed. |
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Tue Apr 14 11:19:52 2015, Steve, Update, PEM, large chamber has arrived
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It is here.
Quote:
The 40m fenced area will |
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Mon Apr 27 09:09:15 2015, Steve, Update, PEM, air cond filters checked
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Quote:
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Sun May 3 01:04:19 2015, rana, Summary, PEM, Seismo signals are bad
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https://ldas-jobs.ligo.caltech.edu/~max.isi/summary/day/20150502/pem/seismic/
Looks like some of our seismometers are oscillating, not mounted well, or something like that. No reason for them to be so different.
Which Guralp is where? And where are our accelerometers mounted? |
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Wed May 13 10:07:36 2015, rana, Frogs, PEM, Guralp breakout paddle
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Reward being offered for the safe return of this thing:
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Wed May 13 13:33:34 2015, Steve, Frogs, PEM, Guralp breakout box recovered
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COD_Sugar napolion is due to Steve: Item delivered, model CMG-SCU-0013, sn G9536
Quote:
Reward being offered |
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Thu May 14 17:41:10 2015, rana, Update, PEM, weather station and Guralp maintenance
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Today Steve and I tried to recenter the Guralps. The breakout box technique didn't work for us, so we just turned the leveling screws until we got
the mass position outputs within +/-50 mV for all DoF as read out by the breakout box.
Some points: |
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Sat May 16 21:40:29 2015, rana, Update, PEM, Guralp maintenance
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Tried swapping cables at the Guralp interface box side. It seems that all of our seismic signal problems have to do with the GUR2 cable being flaky (not
surprising since it looks like it was patched with Orange Electrical tape!!
rather than proper mechanical strain relief). |
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Tue May 19 11:50:52 2015, manasa, Update, PEM, No noticeable effect from M4.0 earthquake
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There was an earthquake: M4.0 - 40km SSW of South Dos Palos,
California
No noticeable effects on the IFO. MC did not lose lock; however the arms did unlock. |
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Tue May 19 19:24:30 2015, rana, Update, PEM, Seismic BLRMS filters
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I was wondering about the design of the BLRMS fitlers for the seismic channels since the STS ones seem to have so little gain compared to the Guralps.
Here are some plots of the Bode magnitude and impulse responses of the bandpass filters (before the low passing). There's a bunch of entries
from Masha on this from her SURF summer. Can anyone comment on why they are all so different? |
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Tue May 26 11:05:10 2015, Steve, Update, PEM, worked around ETMY seism.
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| The cable tray holder cross beam is removed and cut short for good access to seismometer. |
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Thu May 28 10:42:19 2015, Steve, Update, PEM, bad Guralp X-cable
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Quote:
Tried swapping cables
at the Guralp interface box side. It seems that all of our seismic signal problems have to do with the GUR2 cable being flaky (not surprising since it |
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Thu May 28 15:10:44 2015, rana, Update, PEM, Seismic Confusion
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You are plotting the STS channels, not Guralp. These are for the Trillium 240 seismometer.
Also, you cannot tell if the seismometer is working by plotting the MEAN trend. That just gives the average and we need
the fluctuations. Better off looking at the spectrum like I did last time. |
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Thu May 28 16:43:52 2015, Steve, Update, PEM, Guralps swapped
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Koji and Steve,
The result: bad Guralp x-arm cable.
I will swap the short cables tomorrow at the base. |
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Mon Jun 1 15:22:19 2015, Steve, Update, PEM, Guralps X- short cable is bad
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Quote:
Koji and Steve, |
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Wed Jun 3 17:04:08 2015, ericq, Update, PEM, Wilcoxon Accelerometer Huddle Test
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I've set up the Wilcoxon accelerometers on the SP table for a huddle test, to estimate their noise levels.
They're clamped down to the table along the same axis, and their housings are in good contact, in hopes to make them as correlated as possible.
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Wed Jun 10 02:50:39 2015, ericq, Update, PEM, Wilcoxon Accelerometer Huddle Test
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Here are some results for the 3-corner hat subtraction for the six accelerometers, from ~1 hour of data that didn't look to have any sharp features/glitches
from human activity in the lab.
I used the python uncertainties package to try and get an estimate of the uncertainty in the subtracted noise floor, by taking into account every |
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Mon Jun 15 16:55:39 2015, ericq, Update, PEM, Accelerometers installed
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The accelerometers have been installed at MC1 and MC2. MC2 data is live, I haven't yet run the cables from the MC1 set to the preamp yet, though.
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Wed Jun 17 15:31:50 2015, ericq, Update, PEM, Accelerometers fully installed
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MC1 accelerometer has been plugged in. The modecleaner locking has been intermittent today, but I looked at a 15 minute lock in DTT, looking at the STS1
seismometer and both accelerometer triplets. Plot and DTT xml attached.
For the sake of not cluttering up everything with legends, the coherence plots are organized by direction (x, y, z), and include the coherence |
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Sun Jun 21 13:21:03 2015, rana, Update, PEM, Wilcoxon Accelerometer Huddle Test
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To improve our sensor noise estimate,
the ACC cables should be clamped using a rubber pad and a big dog clamp on the SP tabletop before exiting the table. Also the sensors
themselves should be covered with a foam box or a double cardboard box. The high-frequency acoustic noise may limit the 10 Hz performance |
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Tue Jun 23 11:18:20 2015, Steve, Update, PEM, cleaning around chambers
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Keven is our regular janitor is out for a few weeks.
The sub is careful- gentel Mario. We wiped arouind the vertex cambers north side on the floor and east arm racks.
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Wed Jul 1 11:45:48 2015, Steve, Update, PEM, cleaning around ETMX chamber
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Quote:
Keven is our regular
janitor is out for a few weeks. |
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Sun Jul 5 18:14:13 2015, Ignacio, Update, PEM, Wilcoxon Accelerometer Huddle Test 8x
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Updated: On Thursday/Friday (sorry for late elog) I was messing with Eric's Wilcoxon 731A accelerometer huddle test data that was taken without
the box and cables being adjusted properly. Anyways, I performed the three cornered hat analysis as he had done but I also performed a six cornered hat
method as well instead of permuting around in pairs of three accelerometers. The following plots of the ASD's show the results, |
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Thu Jul 23 15:41:41 2015, Steve, Update, PEM, fitting ants with TERRO
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Pasadena got 0.2" of rain on Saturday. Temperatures were high with high humidity since than.The ants were back in the Control room east side
benches.
We have started using TERRO Liquid Ant Baits in January 2015 This worked very well to this point. |