Last supper before departing at  "Grazie" El Portal. All the best on your journey!

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.

The laser went off around 11am yesterday. It was turned on

Jessica Pena, Megan Kelly, Eve Chase and Ignacio Magana received 40m specific basic safety traning today.

Mario wiped the floor around the ETMX chamber today.

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.

Tree new packages were opened  yesterday and the ants are gone.

We can conclude that these baits must be replaced after 6 mounts.

The liquid baits contains BORAX  and it is safe.

Thursday morning I found the control room emergency exit not locked.

Please check the doors when leaving the lab , specially when you are the last one out.

Specially heavy items: old analoge scope or hardware loaded boxes......etc

 The table cover section holding crossbars are not evenly spaced.

You have to center each cover section on the cross bar so it is supported on both sides !

I will clean up on this table tomorrow

We just had fire alarm trigged avacuation of the 40m lab.

It turned out that the CES building second floor sensor caused this action.

Sorry Jamie, I accidentally deleted your elog entry #11453

Koji could pull out easily 11 of the wires  from their socket.

Koji soldered new 50" long cable for the Y station.

Atm1,  New short-50" long cable was installed at ETMY end ( Y-station ) between Guralp-B ( MIT ) and granite base.

Interface box input 2 was left connected to cable 1 and input 1 to cable 2. This plot shows no change.

Atm2, Than I swapped the two long cables at the interface box

                                                                                                   Now the signal seems to be ok <2 Hz,

                                                                                                                                                       >2 Hz some problem exist.

I will look for more bad soldering tomorrow. How many cables did she make?

We have to redo this cable also

1. Yesterday we did put the vacuum system into safe to reboot mode  for the ethernet card swap.
2. Atm1, IFO pressure
3. Atm2, as prepared valve configuration where " moving " means closed and disconnected

The wasp nest will be removed tomorrow from from the out side of the east arm window.

The resonant frequency of the newly arrived gravity bee detector is not known.
 

Atm1, Before cable swap

Atm2, The long cables were swapped at the input of the interface box.

We can conclude that the problem is in the interface box

I wonder if interface box input 3 is wired?

The Guralp ADC  interface box  D060506 is ready for inspection. It is in front of 1X1 with open top and running.

Obviously c7 as 1 miroF cap is missing.

Koji and Steve,

We took transferfunctions of each channel yesterday. They were identical ?. I will check the cables from ADC to DAQ next.

PMC needed to be locked manually.

I'm making a new long cable. Both connector ends of this X arm long cable were terrible. It was removed from the cable tray yesterday.

The Y arm Guralp is running fine. The interface box is open in front of 1X1 on a cart and it is alive!    Please be aware of it !

Alessandra Marrocchesi received 40m specific basic safety training yesteday.

Ara! Onara suru tsu-mori datta keh-do, un-chi ga de-chatta...

The new cable was made this way:

Pins were located with ohm meter for locations and both ends were cut off.The Belden 1424A cable than was soldered to DB37 and Guralp circular connector " IKPT06F16-26S-ND "

This cable will connect the ADC interface box CCD# DO 60506 to Guralp seismometer at the sout end.

The Guralp's each 3 axies will be connected through a twisted pair to the differential input op amp

Gur  ouput  vertical axis + -  on circular connector   A, B  to DB37 pin 1 &20

Gur output        N/S axis + -  on circular connector   C, D to DB37 pin 2 & 21

Gur output       E/W axis + -  on circular connector   E, F to DB37 pin 3 & 22

Power +12 VDC  from DB37 pin 29 to Gur circular connector pin c (lower case)

Power -12 VDC  from DB37 pin 24 to Gur circular connector pin  M Note: this connection was absent at the first test of this cable!

Ground              from DB37 pin 10 to Gur circular connector pin b (lower case)

Summery: I may destored the opamp  at the Guralp A at the south end.

I moved Gur A from ETMX to ETMY . Gur B at ETMY was disconnected and its cable  connected to Gur A

It seems that Gur A is alive. I will stop using A and B names after we stop swapping components.

Rana, Steve

We investigated the ETMY oplev table set up and did not find a red herring.

Two 2 years  vs one day plot below.

ps: thanks  Q for fixing  DTT, the auto scaling is not working at sampling rate 10 min and 1 hr period??

FOSC-2-64-50-L-1-H64F-2
Single mode coupler, 2x2, 1064nm +/-20nm, 50/50 ratio, 900micron loose tube jacket, Hi1060flex fiber, 1m fiber length, FC/APC connectors

Four of these items ordered yesterday from http://afwtechnologies.com.au/sm_coupler.html

New stage can hold the correct polarization.

DRAWING CORRECTION:  Post block height was lowered to be 1.88" from 2.0"

The ETMY enclosure feedthrough - north is installed. The sealing material is hard to work with.

The upper empty blocks will be replaced by something soft to make changing cables easy.

TP2 dry fore pump sn PLE10082 was replaced at pressure 717 mTorr,  TP2 50K rpm 0.33A @ 112,677 hrs

Top seal life was 8,160 hrs

Model  SH110, Sn LP1007L556 was installed. It's fore line pressure after 30 minutes of running 38 mTorr, TP2 turbo at 50K rpm 0.18A

ETMY optical table enclosure feedthrough- south is in. Now it is time to see how air tightness increases performance.

I doubt we'll see any effect until we carefully seal the holes. If there's 1 hole in your boat it still sinks.

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.

Precondition:

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.