No damage. The BS sensor UR 0.220 V has been low for some times.
Dataviewer does not work for long term trend.
ETMY - Guralp (B-MIT) was covered with copper lined can yesterday afternoon. It's long cable is connected to ADC interface box input 1
The vertex Trillium was covered just ~2 days before Ignacio left.
ETMX - Guralp (A-Caltech) is not covered. The long 40m cable is disconnected at the the south end.
CC4 cold cathode gauge jump triggered interlock to close VM1 valve to protect the RGA.
The IFO pressure is 1e-5 Torr
Vac normal was recovered by opening VM1
The cold cathode gauge is back to normal. cc4 is the last gauge is "functioning"
MKS is not responding. The spare controller and gauges are back for repair.
Our last effort to change the existing Al-6061 wire standoffs was at April 2012
We requested sapphire and/or ruby materials with smaller R at the bottom of the groove. Groove polishing was asked for.
Insaco Inc. quote 84740 as " best effort " NO POLISHING. The groove cut to be with eximer laser.
Jeff Lewis as 9-12-2012: the LIGO sapphire prisms grooves were NOT POLISHED but Resonatics used the corner of a rasor blade to scrape off the
ablated material wich was redeposited in and around the grooves.
We have talked about the drift of ETMX sus on the Wednesday meeting.
It has stopped moving on Jan 8, 2015 and it has been reasanable stable since than.
The IFO pressure is estimated ~1E-6 Torr with modified Vac normal valve configuration.
CC4 is in a jumping mode between 2e-5 and 1e-6 Torr
Pressure based interlock kicks in to close VM1 at 2e-5 Torr to protect the RGA.
I did open VM1 repeatedly in the last few mornings but as cc4 jumps VM1 closes.
As VM1 closed to RGA scans are not seeing the IFO. I will look at some scans on Monday.
Mean while I opened VM2 to lower the pressure for the RGA. This change will be read by "Current Status: Undefined State"
So do not panic, the IFO pressure is normal.
I need someone's help to raise the interlock threshold to 5e-5 Torr
I'm buying a new cold cathode gauge on Monday.
note: cc1 is out of order!
just read P1 the pressure is < 7e-4 Torr This gauge is very reliable and it is at the low end of it's range.
Gautam and Steve,
The decommissioned server from LDAS is retired to the 40m with 32 cores and 128GB of memory in rack 1X7 http://docs.oracle.com/cd/E19121-01/sf.x4600/
Cable numbered #53 from Accelerometer 4 to 1X7 / DAQ input c26 was squased while removing network card from Sun Fire x4600 today.
This cable has to be tested.
Gautom has received 40m specific basic safety training today.
RGA background scan.
The IFO is closed off from RGA with VM1
CC4 ( and CC1) is still flaky and it's interlock closes VM1
This JDSU 1103P laser, sn P892324 lived for 2 years. It's power output is 0.05 mW now
It was replaced with brand new JDSU 1103P, sn P919645, Mfg date 12/2014 with 2.75 mW output.
There is 0.14 mW light returning to the qpd = 7,250 counts without AR 632 lenses
Vacuum normal configuration with VM1-closed, VM2-open valve positions. Power load normal 24V 0.2A
Maglev rotation 560 Hz at room temp body temp.
"NO COMM" error message on medm screen. Gauge controller pressures are read able.
All vac comp LEDs are green. We have to reboot on Monday to enable communication.
[ericq, Gautam, Steve]
Following roughly the same procedure as ELOG 11354, c1vac1 and c1vac2 were rebooted. The symptoms were identical to the situation in that ELOG; c1vac1 could be pinged and telneted to, but c1vac2 was totally unresponsive.
The only change in the linked procedure was that we did not shut down the maglev. Since I unwittingly had it running for days without V4 open while Steve was away, we now know that it can handle shorter periods of time than that...
Upon reboot, many channels were readable again, unfortunately the channels for TP2 and TP3 are still blank. We were able to return to "Vacuum normal state," but because of unknowned communication problems with VM1's interlock, we can't open VM1 for the RGA. Instead we opened VM2 to expose the RGA to the main IFO volumn, but this isn't part of the "Normal" state definite, so things currently read "Undefined state".
1, Pressure gauges had no communication ( NO COMM ) with c1vac2
2, Lost N2 supply on Oct 9 This triggered a normal all valve closed condition. At this point you replace N2 cylinders and manually swich valves to recreate VAC NORMAL configuration in the correct sequential order.
The very last thing you do is open V1 gate valve.
a, check TP2 that is the forepump of the Maglev. Foreline pressure to drypump ~ 10- 100 mTorr, rotation speed 50 Krpm
b, open V4 if P2 <1Torr
c, check Maglev rotating at 560 Hz
d, open V1 if P1 <500 mTorr
e, check TP3 foreline, rotation speed and open V5 if P3 <1 Torr with VA6 closed
f, open VA6 if PAN <1 Torr
g, open annulos valves one by one , like VASE if PASE <1 Torr and so on...........Now the Current State: should read Vac Normal
3, Maglev run for 7 days with V4 closed. This encreased its foreline pressure to estimated few Torrs and its body temp rose ~30C on the outside.
So it was sweating and it may be back streamed.
The present RGA data is indicating that it had to be very mild.
The RGA will have better sensitivity with VM1 open and VM2 closed.
The PSL output shutter stayed open during these period is pointing to IFO pressure stayed P1 <3 mTorr
PROBLEM: P1 and P2 plot should show nothing where there is no communication.http://nodus.ligo.caltech.edu:8080/40m/151016_182003/oct16Fpm2015.png
How do we check if pressure based software interlocks are working in this no communication condition?
Convectron gauge check:
Brand new 10 years old convectron gauge at atm was swapped into the place of existing gauges to see if they read close to 760 Torrs
They did reasonable well at the low end. I tried to imitate calibration and bring down the high end with little success.
( P1 and P2 were reading 7e-4 to ~660 Torr The correction of the upper end pushed up the lower end too. I will correct this later
P3 and P4 high ends are way off )
The point is that they work. Convectron gauges will be replaced and calibrated at the next vent.
Interlocks were not triggered during this test. I was expected to close the PSL shutter when P1 was reading 760 Torr
This hide some problem or not understanding.
It was good to see CC1 and CC4 working at the moment
Somehow I succeded opening VM1 and closed VM2 = vacuum normal
I just hope it stays open overnight to get comparable RGA scan.
Clean comparable scan at vacuum normal. There was no backstreaming.
CC1 and CC2 are working again. Why did they start working again ?
The oplev and the LSC are off.
Yutaro Enamoto, visiting graduate student of Seiji received 40m specific basic safety training.
ETMX was not much effected by this 8.3 M Chilian earthquake. It was kicked up and it was kicking for hours after it. This is a sign of instability but it maintaind it's position.
The 24 hours plot follows the tempeerature.
I just turned off the PSL enclousure lights.
The ITMX OSEMS are oscillating.
The PMC is not happy and the ITMX UL OSEM is moving too much
Building: San Pasqual walkway East to West
(Between Holliston & Wilson)
Date: Thursday 11-12-15 to Wednesday 11-18-15
Time: Between 6:00 a.m. and 4:00 p.m. each day
Notification: Possible Noise Vibration
Contact: Ken Lewis (626) 298-2037
* Plumbing contractor will be inspecting and water jetting Storm drains
Type of interruption: (Some vehicle noise and small vibrations limited to close surrounding area)
Areas effected: San Pasqual walkway from Holliston Street to Wilson)
Potential effects: storm drain loss of use
Reason for interruption: Storm drain cleaning in preparation for rainy season
Are they oscillating or not ?
ETMX, ETMY and MC2 POS _biases are off. Why ?
The Epics MEDMs screens are going blank in ~3-5 minutes reluctantly.
A Caltech maintenance staff dropped by at around noon today, and told me that he had seen a small puddle of water on the other side of the door along the Y-arm that is kept locked (about 10m from the end-table, on the south side of the arm). He suspected a leak in the lab. Koji and I went down to the said door and observed that there was indeed a small puddle of water accumulated there. There isn't any obvious source of a leak on our side of the door, although the walls tiles in the area suggest that there could be a leak in one of the pipes running through the wall/under the floor. In any case, the leak doesn't seem too dramatic, and we have decided to consult Steve as to what is to be done about this once he is back on Wednesday.
The leak was found inside the wall. Fortunately the plumbers were able to access it from CES room 108
This has been leaking for sometimes. The damaged wall area is about 18 ft long and 1 ft high.
Dataviewer x axis end is not there.
On ( 2600 days) longer plots it is missing 8 moths and on (100 days) shorther plot it is missing 1 month.
Q adjusted the Dataviewer so it is not chopping of data any more. Thanks.
Cold cathode gauge reading of 10 years.
The noise floor of the Rga scan is glitching less today
Glitches are gone. Rga scan is good
Two companies are willing to make the ruby grooves and the third one is still working on their quote.
The price is ~$100 each. The cost goes down 10% if we order 50 instead of 30 pieces.
How many should we get ?
c1sus and c1ioo were restarted. PMC locked.
Two mechanical and two sticdky traps were set to catch univited visitor.
Absolutely no food or food remains into inside garbage cans!!!!!!!!!!!!!!!!!!!!!!!!!
A small rat / large mouse just ran through the control room. Ugh.
I think there should be a scientifically based aveluation of the ETMY enclosure so we can make the ETMX better.
Meanwhile I'm counting pieces to move on with the south end table cover.
PMC locked manually and PRM sus damping restored.
Suspensions are recovered after 4.2 Mag earth quake. No obvoius sign of damage.
Suspensions recovered after 4.4 Mag EQ
Our janitor confirmed that Q was not hallucinating about this animal. The dropping size indicating a good size one in the IFO room.
One of the mechanical traps moved from the control room to the east arm, close to the " machine shop " door.
I'm going to get more traps.
Please look around when working close to these five locations. Use flashlights or leave lights on.
These mechanial traps are HAZARDOUS !
No visitors or tours till Monday, Jan 11 2016
IFO restored after 4.5 Mag Banning, Ca earthquake.
Projector light bulb ordered
[ Manasa, Ericq and Steve ]
Vivitek D952HD with 186 hours installed.
PMC locked and ETMX suspension damping restored.
Air condition maintenance is happening. It should be done by 10am
No obvious sign of damage.
Just an other local earthquake 3.6 Mag Ludlow, Ca
No obvious sign of damage
ETMX suspension damping restored.
PRM suspension damping restored after 4.1 Mag Ludlow earthquake.
The noisy fan belt on the roof of the control room was finally replaced on Friday, Jan 22 2016