40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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ID Date Author Type Categoryup Subject
  2639   Thu Feb 25 11:21:06 2010 KojiUpdateGeneralTanks opened

[Steve, Bob, Joe, Zach, Alberto, Kiwamu, Koji]

We opened the OMC-IMC access connector, ITMX North door, and ITMY West door.
We worked from 9:30-11:00.
The work was quite smooth thanks to the nice preparation of Steve as usual.

Thank the team for the great work!

 

  2643   Fri Feb 26 11:48:36 2010 KojiUpdateGeneralMC incident beam shift

Last night I worked on the MC incident beam such that we can hit the center of the MC mirrors.

Steve and I checked the incident beam on MC1. We found the beam is ~5mm south.
This was not too critical but it is better to be realigned. I moved the steering mirror on the OMC
table (in vac). We kept the MC resonated. After the maximization of the resonance, I realigned the
MC1 and MC3 such that the resonance in dominated by TEM00.

Jenne, Kiwamu, and I then closed the light door on to the OMC/IMC.

I will make more detailed entry with photos in order to explain what and how I did.

  2645   Sun Feb 28 16:45:05 2010 ranaSummaryGeneralPower ON Recovery
  1. Turned ON the RAID above linux1.
  2. Hooked up a monitor and keyboard and then turned ON linux1.
  3. After linux1 booted, turned ON nodus - then restarted apache and elog on it using the wiki instructions.
  4. Turned on all of the control room workstatiions, tuned Pandora to Johnny Cash, started the auto package updater on Rosalba (517 packages).
  5. Started the startStrip script on op540m.
  6. turned on RAID for frames - wait for it to say 'SATA', then turn on daqctrl and then fb40m and then daqawg and then dcuepics
  7. turned on all the crates for FEs, Sorensens, Kepcos for LSC, op340m, mafalda was already on
  8. fb40m again doesn't mount the RAID again!
  9. I turned on fb40m2 and that fixes the problem. The fb40m /etc/vfstab points to 198.168.1.2, not the JetStor IP address.
  10. I plugged in the Video Switch - its power cord was disconnected.
  11. FEs still timing out saying 'no response from EPICS', but Alberto is now here.

Sun Feb 28 18:23:09 2010

Hi. This is Alberto. Its Sun Feb 28 19:23:09 2010

  1. Turned on c1dcuepics, c0daqctrl and c0daqawg. c0daqawg had a "bad"status on the daqdetail medm screen. The FEs still don't come up.
  2. Rebooted c1dcuepics and power cycled c0daqctrl and c0daqawg. The problem is still there.
  3. Turned on c1omc. Problem solved.
  4. Rebooted c1dcuepics and power cycled c0daqctrl and c0daqawg. c0daqawg now good. The FE are coming up.
  5. Plugged in the laser for ETMY's oplev
  6. Turned on the laser of ETMX's oplev from its key.

 Monday, March 1, 9:00 2010 Steve turns on PSL-REF cavity ion pump HV at 1Y1

  2664   Tue Mar 9 09:32:31 2010 KojiSummaryGeneralWideband measurement of Fast PZT response

I have measured a wideband response of the fast PZT in the LWE NPRO 700mW in the Alberto's setup.
This is a basic measurement to determine how much phase modulation we can obtain by actuating the fast PZT,
primarily for the green locking experiment.

RESULT

  • Above 200kHz, there are many resonances that screws up the phase.
     
  • Modulation of 0.1rad can be easily obtained even at 10MHz if the modulation frequency is scanned.
     
  • Change of the laser frequency in DC was observed depending on the modulation frequency.
    i.e. At the resonance the laser frequency escaped from the RF spectrum analyzer.
    This may induced by the heat dissipation in the PZT causing the temperature change of the crystal.
     
  • Some concerns: Is there any undesired AM by the PZT modulation?

---

METHOD

1. Locked the PLL of for the PSL-NPRO beating at 20MHz.

2. Added the modulation signal to the NPRO PZT input.
I used the output of the network analyzer sweeping from 100kHz to 1MHz.

3. Measured the transfer function from the modulation input to the PLL error signal.
The PLL error is sensitive to the phase fluctuation of the laser. Found that the first resonance is at 200kHz.
The TF is not valid below 3kHz where the PLL suppresses the modulation.

4. Single frequency modulation: Disconnected the PLL setup.
Plug Marconi into the fast PZT input and modulate it at various frequencies.
Observing with the RF spectrum analyzer, I could see strong modulation below 1MHz.
It turned out later that the TF measurement missed the narrow peaks of the resonances due to the poor freq resolution.

Also the modulation depth varies frequency by frequency because of the resonances.
Scanned the frequency to have local maximum of the modulation depth. Adjusted the
modulation amplitude such that the carrier is suppressed
(J0(m)=0 i.e. m~2.4). As I could not obtain
the carrier suppression at above 1MHz, the height of the carrier and the sidebands were measured.

The modulation frequency was swept from 100kHz to 10MHz.

5. Calibration. The TF measured has been calibrated using the modulation depth obtained at 100Hz,
where the resonance does not affect the response yet.

The responce of the PZT was ~10MHz/V below 30kHz. Looks not so strange although this valure is
little bit high from the spec (2MHz/V), and still higher than my previous experience at TAMA (5MHz/V).
Note that this calibration does not effect to the modulation depth of the single freq measurement as they are independent.

Attachment 1: PZT_response.png
PZT_response.png
  2709   Wed Mar 24 12:40:25 2010 daisukeConfigurationGeneralPeriscope for green laser delivery from the BSC to PSL table

The periscope design for beam elevation of the green beams is posted. The design for the 90 deg steering version is also coming.

(2010-03-29: update drawings by daisuke)

90deg version: http://nodus.ligo.caltech.edu:8080/40m/2725

40m_periscope.png

Attachment 2: 40m_periscope_A_100329.pdf
40m_periscope_A_100329.pdf 40m_periscope_A_100329.pdf 40m_periscope_A_100329.pdf 40m_periscope_A_100329.pdf
Attachment 3: 40m_periscope_A_dwg_100329.zip
  2725   Mon Mar 29 01:45:26 2010 daisukeConfigurationGeneralPeriscope version B for green laser ...

Here the design of the periscope for the 90 deg steering version is posted.

straight version http://nodus.ligo.caltech.edu:8080/40m/2709

Attachment 1: 40m_periscope_B.png
40m_periscope_B.png
Attachment 2: 40m_periscope_B_100329.pdf
40m_periscope_B_100329.pdf 40m_periscope_B_100329.pdf 40m_periscope_B_100329.pdf 40m_periscope_B_100329.pdf
Attachment 3: 40m_periscope_B_dwg_100329.zip
  2746   Thu Apr 1 00:43:33 2010 MottUpdateGeneralPZT response for the innolight

Kiwamu and I measure the PZT response of the Innolight this evening from 24 kHz to 2MHz.  

We locked the PLL at ~50 MHz offset using the Lightwave NPRO and and swept the Innolight with the network analyzer (using the script I made; it has one peculiar property, but it does work correctly).  

We will post the plot of the Lightwave PZT response tomorrow morning.

 

**EDIT**: As Koji pointed out, the calibration factor on this plot is WRONG.  See my more recent update for the correctly calibrated plot.

Attachment 1: Innolight_Bode.png
Innolight_Bode.png
  2747   Thu Apr 1 07:17:15 2010 KojiUpdateGeneralPZT response for the innolight

The shape of the TF looks nice but the calibration must be wrong.

Suppose 1/f slope with 10^-4 rad/V at 100kHz. i.e. m_pm = 10/f rad/V
This means m_fm = 10 Hz/V. This is 10^6 times smaller than that of LWE NPRO.

(Edit: Corrected some numbers but it is not significant)

Quote:

Kiwamu and I measure the PZT response of the Innolight this evening from 24 kHz to 2MHz.  

We locked the PLL at ~50 MHz offset using the Lightwave NPRO and and swept the Innolight with the network analyzer (using the script I made; it has one peculiar property, but it does work correctly).  

We will post the plot of the Lightwave PZT response tomorrow morning.

 

  2748   Thu Apr 1 10:21:58 2010 MottUpdateGeneralPZT response for the innolight

Quote:

The shape of the TF looks nice but the calibration must be wrong.

Suppose 1/f slope with 10^-4 rad/V at 10kHz. i.e. m_pm = 1/f rad/V
This means m_fm = 1 Hz/V. This is 10^7 times smaller than that of LWE NPRO.

Quote:

Kiwamu and I measure the PZT response of the Innolight this evening from 24 kHz to 2MHz.  

We locked the PLL at ~50 MHz offset using the Lightwave NPRO and and swept the Innolight with the network analyzer (using the script I made; it has one peculiar property, but it does work correctly).  

We will post the plot of the Lightwave PZT response tomorrow morning.

 

 Koji is absolutely right.  I just double checked my matlab code, and saw that I divided when I should have multiplied.  The correctly calibrated plots are attached here for the Innolight and the lightwave.  Kiwamu and I will measure the amplitude and the jitter today.

Attachment 1: Innolight_Response.png
Innolight_Response.png
Attachment 2: Lightwave_response.png
Lightwave_response.png
  2749   Thu Apr 1 10:47:48 2010 KojiUpdateGeneralPZT response for the innolight

Innolight: 100rad/V @ 100kHz  => 1e7/f rad/V => 10MHz/V

LWE: 500rad/V @ 100kHz =>  5e7/f rad/V => 50MHz/V

They sound little bit too big, aren't they?

  2750   Thu Apr 1 12:07:22 2010 ranaUpdateGeneralPZT response for the innolight

The Lightwave NPRO should be around 5 MHz/V. 

The Innolight PZT coefficient is ~1.1 MHz/V.

(both are from some Rick Savage LHO elog entries)

  2754   Thu Apr 1 18:05:29 2010 MottUpdateGeneralPZT response for the innolight

 

 We realized that we had measured the wrong calibration value; we were using the free-running error signal with the marconi far from the beat frequency, which was very small.  When we put the Marconi right at the beat, the signal increased by a factor of ~12 (turning our original calibration of 10 mV/rad into 120 mV/rad).  The re-calibrated plots are attached. 

Attachment 1: Innolight_Response_calFix.png
Innolight_Response_calFix.png
Attachment 2: Lightwave_response_calFix.png
Lightwave_response_calFix.png
  2755   Thu Apr 1 18:44:40 2010 KojiUpdateGeneralPZT response for the innolight

Innolight 10 rad/V @ 100kHz => 1e6/f rad/V => 1MHz/V

LWE 30 rad/V @ 100kHz => 3e6/f rad/V => 3MHz/V

---------

BTW, don't let me calculate the actuator response everytime.

The elog (=report) should be somewhat composed by the following sections

Motivation - Method - Result (raw results) - Discussion (of the results)

Quote:

  We realized that we had measured the wrong calibration value; we were using the free-running error signal with the marconi far from the beat frequency, which was very small.  When we put the Marconi right at the beat, the signal increased by a factor of ~12 (turning our original calibration of 10 mV/rad into 120 mV/rad).  The re-calibrated plots are attached. 

 

  2756   Thu Apr 1 19:59:32 2010 MottUpdateGeneralPZT response for the innolight

 

 We measured the Amplitude Modulation response of the PZTs, to find regions with large phase modulation but small amplitude modulation.

We did this by blocking 1 arm of the PLL, feeding the source output of the Network Analyzer into the PZT input of the laser in question, and reading the output of the PD on the NA.  We calibrated by dividing by the DC voltage of the PD (scaled by the ratio of the AC gain to DC gain of the New Focus PD).

The AM response of the Innolight looks fairly smooth up to ~1MHz, and it is significantly below the PM response for most of its range.  The region between 20 and 30 kHz shows very good separation of about 10^3 rad/RIN (and up to 10^5 rad/RIN at ~21.88 kHz, where there is the negative spike in the AM response). The region between 1.5 MHz and 2MHz also looks viable if it is desirable to actuate at higher frequencies.

The Lightwave offers very good AM/PM separation up to about 500 kHz, but becomes quite noisy about 1MHz.

Attachment 1: Innolight_AM_Response.png
Innolight_AM_Response.png
Attachment 2: Innolight_AM_PM.png
Innolight_AM_PM.png
Attachment 3: InnoVsLW_PM.png
InnoVsLW_PM.png
Attachment 4: Innolight_AM_Response.png
Innolight_AM_Response.png
Attachment 5: Lightwave_AM_PM.png
Lightwave_AM_PM.png
  2763   Sun Apr 4 17:32:07 2010 AlbertoMetaphysicsGeneralnew y-arm?

Quote:

There's several more of the this vintage in one of the last cabinets down the new Y-arm.

 Hold on, did the arms get re-baptized?

  2845   Mon Apr 26 12:24:58 2010 josephbUpdateGeneralDaily Downs update

Talked with Jay briefly this morning.

We are due another 1-U 4 core (8 CPU) machine, which is one of the ones currently in the test stand.  I'm hoping sometime this week I can convince Alex to help me remove it from said test stand.

The megatron machine we have is definitely going to be used in the 40m upgrade (to answer a question of Rana's from last Wednesday's meeting).  Thats apparently the only machine of that class we get, so moving it to the vertex for use as the LSC or SUS vertex machine may make sense.  Overall we'll have the ASS, OMC, Megatron (SUS?), along with the new 4 1-U machines, for LSC, IO, End Y and End X.  We are getting 4 more IO chassis, for a total 5.  ASS and OMC machine will be going without full new chassis.

Speaking of IO chassis, they are still being worked on.  Still need a few cards put in and some wiring work done.  I also didn't see any other adapter boards finished either.

  3063   Thu Jun 10 10:58:02 2010 KojiUpdateGeneralLaTeXlabs

I could not dare to share my google doc with this site...

Quote:

Quote:

BTW, latex launched this new thing for writing pdfs. doesnot require any installations.  check  http://docs.latexlab.org

 so cool!

 

  3064   Thu Jun 10 11:10:21 2010 AlbertoUpdateGeneralLaTeXlabs

Quote:

I could not dare to share my google doc with this site...

Quote:

Quote:

BTW, latex launched this new thing for writing pdfs. doesnot require any installations.  check  http://docs.latexlab.org

 so cool!

 

Just in case,  granted access to Google docs can be revoked any time from here:

https://www.google.com/accounts/IssuedAuthSubTokens

  3082   Wed Jun 16 18:14:13 2010 AidanUpdateGeneralGlass cover from overhead light smashed on PSL table

I was giving a tour of the 40m yesterday. We were looking at the PSL table. About 30 seconds after I turned the lights on a glass cover from one of the lights (NW corner) popped out of its holder and smashed on the table.

I've cleaned up all the broken glass I could see but there may be some small shards there. Please use caution in that area.

Attachment 1: DSC_1769.JPG
DSC_1769.JPG
Attachment 2: DSC_1768.JPG
DSC_1768.JPG
  3085   Fri Jun 18 13:42:52 2010 KojiHowToGeneralUpdate your work

All SURFs (and all others as always) are supposed to post the update of your status on the elog.

In fact, I already heard that Sharmila had been working on the serial connection to TC-200 and made some results. All of us like to hear the story.

  3103   Wed Jun 23 12:31:36 2010 GopalUpdateGeneral6.16.10-6.23.10 Weekly Update

Summary of This Week's Activities:

6/16: LIGO Orientation; First Weekly Meeting; 40m tour with Jenne; Removed WFS Box Upper Panel, Inserted Cable, Reinstalled panel

6/17: Read Chapter 1 of Control Systems Book; LIGO Safety Meeting; Koji's Talk about PDH Techniques, Fabry-Perot Cavities, and Sensing/Control; Meeting w/ Nancy and Koji

6/18: LIGO Talk Part II; Glossed over "LASERS" book; Read Control Systems Book Chapter 2; Literary Discussion Circle

6/21: Modecleaner Matrix Discussion with Nancy; Suggested Strategy: construct row-by-row with perturbations to each d.f. --> Leads to some questions on how to experimentally do this.

6/22: Learned Simulink; Learned some Terminal from Joe and Jenne; LIGO Meeting; Rana's Talk; Christian's Talk; Simulink Intro Tutorial

6/23 (morning): Simulink Controls Tutorial; Successfully got a preliminary feedback loop working (hooray for small accomplishments!)

 

Outlook for the Upcoming Week:

Tutorials (in order of priority): Finish Simulink Tutorials, Work through COMSOL Tutorials

Reading (in order of priority): Jenne's SURF Paper, Controls Book, COMSOL documentation, Lasers by Siegman.

Work: Primarily COMSOL-related and pre-discussed with Rana

  3142   Wed Jun 30 11:35:06 2010 Gopal UpdateGeneral6.23.10 - 6.30.10 Weekly Update

Summary of this Week's Activities:

6/23: LIGO Safety Tour; Simulink Controls Tutorial

6/24: Simulink Diagram for Feedback Loop; Constructed Pendulum Transfer Function; Discussion with Dr. Weinstein

6/25: Prepare for pump-down of vacuum chamber; crane broken due to locking failure; worked through COMSOL tutorials

6/28: Ran through Python Tutorials; Began learning about Terminal

6/29: Wrote Progress Report 1 First Draft

6/30: Began editing Progress Report 1

  3218   Wed Jul 14 12:31:11 2010 nancyUpdateGeneralWeekly Update

Summary of this week's work Wednesday - Aligned the mode cleaner with Koji, and then measured the beam characteristics at MC2 end. Koji then taught me how to read the WFS signals Thursday - wrote a script to measure the signals and calculated the coefficients relating mirror movement and DC signals of WFS. To know the possibility of the control, found SVD of the coeff matrix, and condition number. Friday - Set up the measurement of QPD linear response using a laser outside the cavity. Took data. Monday - did the calculations and plotting for the above experiment. Then played around with the MEDM screens , and also tried to see what happens to the Power Spectrum of WFS signals by changing the coefficients in teh matrix. (failed) Tuesday - played around with WFS, tried seeing what it does when switched on at different points, and also what it does when I disturb the system while WFS has kept it locked.

Today - had switched off the WFS sensors yesterday night after locking the MC as wanted to know that how does MC behave when no WFS gain is applied. I checked in the morning, the MC was locked all night. I am now proceding with my calculations for the sensing matrix
  3251   Tue Jul 20 15:06:48 2010 josephb, bobOmnistructureGeneralNew speakers in ceiling in control room

After the crane training, Bob attached speakers to the ceiling right next to the projector, for use with presentations.

  3284   Sat Jul 24 13:13:41 2010 rana, steve, albertoUpdateGeneralInitial Crane Inspection reveals flaws: wiring and oil

The guy from KroneCrane (sp?) came today and started the crane inspection on the X End Crane. There were issues with our crane so he's going to resume on Monday. We turned off the MOPA fur the duration of the inspection.

  1. None of our cranes have oil in the gearbox and it seems that they never did since they have never been maintained. Sloppy installation job. The crane oiling guy is going to come in on Monday.
  2. They tried to test the X-End crane with 2500 lbs. (its a 1 ton crane). This tripped the thermal overload on the crane as intended with this test. Unfortunately, the thermal overload switch disabled the 'goes down' circuit instead of the 'goes up' circuit as it should. We double checked the wiring diagram to confirm our hypothesis. Seems the X-End crane was wired up incorrectly in the first place 16 years ago. We'll have to get this fixed.

The plan is that they will bring enough weight to test it at slightly over the rating (1 Ton + 10 %) and we'll retry the certification after the oiling on Monday.

  3290   Mon Jul 26 10:04:24 2010 steveUpdateGeneralInitial Crane Inspection reveals flaws: wiring, oil and imbalance

Quote:

The guy from KroneCrane (sp?) came today and started the crane inspection on the X End Crane. There were issues with our crane so he's going to resume on Monday. We turned off the MOPA fur the duration of the inspection.

  1. None of our cranes have oil in the gearbox and it seems that they never did since they have never been maintained. Sloppy installation job. The crane oiling guy is going to come in on Monday.
  2. They tried to test the X-End crane with 2500 lbs. (its a 1 ton crane). This tripped the thermal overload on the crane as intended with this test. Unfortunately, the thermal overload switch disabled the 'goes down' circuit instead of the 'goes up' circuit as it should. We double checked the wiring diagram to confirm our hypothesis. Seems the X-End crane was wired up incorrectly in the first place 16 years ago. We'll have to get this fixed.

The plan is that they will bring enough weight to test it at slightly over the rating (1 Ton + 10 %) and we'll retry the certification after the oiling on Monday.

 The south end crane has one more flaw. The wall cantilever is imbalanced: meaning it wants to rotate south ward, because its axis is off.

This effects the rope winding on the drum as it is shown on Atm2

Atm1 is showing Jay Swar of KoneCrane and the two 1250 lbs load that was used for the test. Overloading the crane at 125% is general practice at load testing.

It was good to see that the load brakes were working well at 2500 lbs. Finally we found a good service company! and thanks for Rana and Alberto

for coming in on Saturday.

Attachment 1: 2500.JPG
2500.JPG
Attachment 2: sedrum.JPG
sedrum.JPG
  3300   Tue Jul 27 16:33:50 2010 KojiSummaryGeneralHigh school students tour

Jenne made the 40m tour for the annual visit of 30-40 students.

c.f.

Tour 2009 http://nodus.ligo.caltech.edu:8080/40m/1717

Tour 2008 http://nodus.ligo.caltech.edu:8080/40m/737

 

Attachment 1: IMG_2657.jpg
IMG_2657.jpg
  3312   Wed Jul 28 16:42:21 2010 steveUpdateGeneralCrane gear box cheched

Quote:

Quote:

The guy from KroneCrane (sp?) came today and started the crane inspection on the X End Crane. There were issues with our crane so he's going to resume on Monday. We turned off the MOPA fur the duration of the inspection.

  1. None of our cranes have oil in the gearbox and it seems that they never did since they have never been maintained. Sloppy installation job. The crane oiling guy is going to come in on Monday.
  2. They tried to test the X-End crane with 2500 lbs. (its a 1 ton crane). This tripped the thermal overload on the crane as intended with this test. Unfortunately, the thermal overload switch disabled the 'goes down' circuit instead of the 'goes up' circuit as it should. We double checked the wiring diagram to confirm our hypothesis. Seems the X-End crane was wired up incorrectly in the first place 16 years ago. We'll have to get this fixed.

The plan is that they will bring enough weight to test it at slightly over the rating (1 Ton + 10 %) and we'll retry the certification after the oiling on Monday.

 The south end crane has one more flaw. The wall cantilever is imbalanced: meaning it wants to rotate south ward, because its axis is off.

This effects the rope winding on the drum as it is shown on Atm2

Atm1 is showing Jay Swar of KoneCrane and the two 1250 lbs load that was used for the test. Overloading the crane at 125% is general practice at load testing.

It was good to see that the load brakes were working well at 2500 lbs. Finally we found a good service company! and thanks for Rana and Alberto

for coming in on Saturday.

 Jeff Stinson, technician of KoneCrane inspected the south end crane hoist gear box. This was the one that was really low on oil. The full condition require

~ 950cc of EPX-7 (50-70W) high viscosity gear oil. The remaining 120 cc oil was drained and the gear box cover was removed. See Atm 1

He found the gear box, load brake and gearing in good condition. The slow periodic sound of the drive was explained by the split bearings at Atm 3

The Vertex and the east end crane gear boxes needed only 60 cc oil to be added to each Atm 4 and their drives were tested.

Conclusion: all 3 gear boxes and drives are in good working condition.

Tomorrow's plan: load test at 1 ton and correct-check  3 phase wiring.

Attachment 1: P1060503.JPG
P1060503.JPG
Attachment 2: P1060511.JPG
P1060511.JPG
Attachment 3: P1060515.JPG
P1060515.JPG
Attachment 4: P1060517.JPG
P1060517.JPG
  3318   Thu Jul 29 12:31:09 2010 KojiSummaryGeneralLab Schedule

July
29 Thu BS chamber work: Move cable towers / green steering mirrors / (2 TTs with TT charactrization) / Put the heavy door by 5PM.
30 Fri Pumping down
31 Sat WFS work by Nancy

Aug
1 Sun - 5 Thu WFS work by Nancy
5 Thu PSL Table prep
6 Fri PSL Table prep / Likely to shut down the PSL

9 Mon PSL Table prep / shutting down of the PSL (optional)
10 Tue PSL box Frame lifting
12 Thu PSL table tapping

16 Mon - 17 Tue concrete pouring preparation
19 Thu - 23 Fri Tripod placement
24 Tue - 26 Thu concrete pouring

Attachment 1: PSL_work_schedule.pdf
PSL_work_schedule.pdf
  3333   Fri Jul 30 14:53:09 2010 steveUpdateGeneralPSL table leg upgrade

Quote:

July
29 Thu BS chamber work: Move cable towers / green steering mirrors / (2 TTs with TT charactrization) / Put the heavy door by 5PM.
30 Fri Pumping down
31 Sat WFS work by Nancy

Aug
1 Sun - 5 Thu WFS work by Nancy
5 Thu PSL Table prep
6 Fri PSL Table prep / Likely to shut down the PSL

9 Mon PSL Table prep / shutting down of the PSL (optional)
10 Tue PSL box Frame lifting
12 Thu PSL table tapping

16 Mon - 17 Tue concrete pouring preparation
19 Thu - 23 Fri Tripod placement
24 Tue - 26 Thu concrete pouring

The PSL table height will be raised to the level of the AP table. This will be done using 6 TMC's Rigid Damped Tripod legs. Their planed positions shown below.

The legs will be grouted to the floor with concrete.

 http://www.techmfg.com/products/floorplatforms/rigiddampedtripod.htm

Attachment 1: psllegs.PDF
psllegs.PDF
  3335   Fri Jul 30 17:52:12 2010 KojiConfigurationGeneralJacket

Jenne and I need our jackets. We removed them from the Rb clock.
Thanks for making them warm.
Probably a Scotland sweater would fit.

  3337   Fri Jul 30 19:20:15 2010 AlastairConfigurationGeneralJacket

Quote:

Jenne and I need our jackets. We removed them from the Rb clock.
Thanks for making them warm.
Probably a Scotland sweater would fit.

 Thanks for the loan guys.  I do have a lot of warm weather clothing at home that is not so necessary in the California climate.  I will find some suitable attire for the Rb clocks there.

  3348   Mon Aug 2 17:12:28 2010 KojiUpdateGeneralLab schedule for the week of Aug. 2

Aug

2 Mon - 5 Thu WFS work (Nancy)

2 Mon - 4 Wed

Jenne: Seismometer fix / Seismic measurements on the PSL table
TT characterization (with Koji)
Preparations ETM suspensions (optional: may be in later weeks)

Kiwamu: CDS test for SUS (may be involving Koji)

Alberto: RF system prep.

All: For 5th and 6th: PSL cabling works Koji

5 Thu PSL Table prep
6 Fri PSL Table prep / Likely to shut down the PSL

9 Mon PSL Table prep / shutting down of the PSL (optional)
10 Tue PSL box Frame lifting
12 Thu PSL table tapping

16 Mon - 17 Tue concrete pouring preparation
19 Thu - 23 Fri Tripod placement
24 Tue - 26 Thu concrete pouring

Attachment 1: PSL_work_schedule.pdf
PSL_work_schedule.pdf
  3368   Thu Aug 5 16:18:37 2010 AlastairUpdateGeneralclocks still not locked fully - hut removed

The rubidium clocks are still not quite locked together, though it is clear that the beat frequency has dropped a lot since yesterday.

I checked on the clocks and the 1pps sync light is on.  The clocks are really hot again though despite the gap left at the bottom of the igloo.  The side of the clocks were hot enough to not be touchable.

I made the executive decision that I would remove the hut just now.  We can let the clocks lock together and then put the hut back on just before measuring.  This way the hut will isolate from temperature fluctuations during the measurement but it won't be running at the hotter equilibrium temperature.  I hope that the temperature won't change too much during the measurement if we put the hut back on.

RA: Attachment deleted because it was in Postscript format. Also not allowed here are the Stone Tablet and Cave Painting formats.

  3377   Fri Aug 6 16:20:08 2010 ranaUpdateGeneralclocks still not locked fully - phase shifted

 I tried to get the clocks to be closer to 90 deg for the relative phase by adding some cable length to one of the lines, but they are still wandering too much. We need to use the serial interface and up the gain in their 1PPS locking loops.

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  3378   Fri Aug 6 17:47:36 2010 steveSummaryGeneralcranes load tested at 1998 lbs

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The guy from KroneCrane (sp?) came today and started the crane inspection on the X End Crane. There were issues with our crane so he's going to resume on Monday. We turned off the MOPA fur the duration of the inspection.

  1. None of our cranes have oil in the gearbox and it seems that they never did since they have never been maintained. Sloppy installation job. The crane oiling guy is going to come in on Monday.
  2. They tried to test the X-End crane with 2500 lbs. (its a 1 ton crane). This tripped the thermal overload on the crane as intended with this test. Unfortunately, the thermal overload switch disabled the 'goes down' circuit instead of the 'goes up' circuit as it should. We double checked the wiring diagram to confirm our hypothesis. Seems the X-End crane was wired up incorrectly in the first place 16 years ago. We'll have to get this fixed.

The plan is that they will bring enough weight to test it at slightly over the rating (1 Ton + 10 %) and we'll retry the certification after the oiling on Monday.

 The south end crane has one more flaw. The wall cantilever is imbalanced: meaning it wants to rotate south ward, because its axis is off.

This effects the rope winding on the drum as it is shown on Atm2

Atm1 is showing Jay Swar of KoneCrane and the two 1250 lbs load that was used for the test. Overloading the crane at 125% is general practice at load testing.

It was good to see that the load brakes were working well at 2500 lbs. Finally we found a good service company! and thanks for Rana and Alberto

for coming in on Saturday.

 Jeff Stinson, technician of KoneCrane inspected the south end crane hoist gear box. This was the one that was really low on oil. The full condition require

~ 950cc of EPX-7 (50-70W) high viscosity gear oil. The remaining 120 cc oil was drained and the gear box cover was removed. See Atm 1

He found the gear box, load brake and gearing in good condition. The slow periodic sound of the drive was explained by the split bearings at Atm 3

The Vertex and the east end crane gear boxes needed only 60 cc oil to be added to each Atm 4 and their drives were tested.

Conclusion: all 3 gear boxes and drives are in good working condition.

Tomorrow's plan: load test at 1 ton and correct-check  3 phase wiring.

 Atm1, service report: load test were performed at max horizontal reach with 1998 lbs ( American Ton is 2000 lbs)

          Vertical drives and brakes worked well. The 5 minutes sagging test showed less than 1 mm movement .

          The wiring is correct. Earlier hypothesis regarding the wiring ignored the mechanical brake action.

Our cranes are certified now. Operator training and SOP is in the work.

Vertex Folding I -beam will get latch-lock and the south end I-beam will be leveled.

Atm2, south end

Atm3, east end

Atm4, folding crane at ITMX at 14 ft horizontal reach

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  3394   Tue Aug 10 17:21:48 2010 steveUpdateGeneralPSL optical table is at 30" height

Mike Gerfen, Koji and Steve,

 

Our old ( 6 x 10 x 1 ) ft Newport optical table will have the same height as the neighboring AP table when this job is finished.

Today's work was to elevate the optical table ~ 2400 lbs to 30" clearance to create a workable space below.

 

Atm1,  enclosure frame was raised by 6"

Atm2,  2 pellet jacks and 4x4 technology in the work.

Atm3,  ready for drill and tap with jig plate in place, note 4 Al legs 8" OD. 1/4" wall safely supporting the load

Atm4,  showing clamps that holding 1/2" plywood with jigs

Atm5, We removed the 4 old legs: 6" OD steel, 1/4" wall and 10" high after they were unloaded.

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  3452   Fri Aug 20 20:36:05 2010 AlastairUpdateGeneralElog

 Elog was down, I restarted it.

  3461   Tue Aug 24 06:34:01 2010 AlastairUpdateGeneralElog...

...was down.  Have restarted it.

  3475   Fri Aug 27 07:21:13 2010 AlastairUpdateGeneralelog...

 was down.  I restarted the version in the 2.7.5 folder.  It went down again almost immediately but stayed up after the second restart.

  3567   Mon Sep 13 12:09:42 2010 kiwamuSummaryGeneralelog restarted

 Elog didn't respond, so I restarted it with the script.

Before killing the process somehow two elog daemons were running at the same time. I killed those two manually. 

  3605   Fri Sep 24 16:31:35 2010 steveConfigurationGeneralopen frame- rack is moved

The squeezing open frame rack was moved from the south side of the PSL enclosure to the north side of the SP table.

AC power breaker is PC-2  #1

 

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  3616   Tue Sep 28 14:12:14 2010 steveUpdateGeneralvertex crane drive is out of order

The vertex crane drive is overheating, it stopped functioning. Service man will be here tomorrow morning.

I crane was just turned  on for for may be  about 5 minutes. The vertical drive was fine for a while, but the horizontal did not worked at all.

The crane is tagged out again and the controller box is cooling down.

  3621   Wed Sep 29 15:34:46 2010 kiwamuUpdateGeneralfixing vertex crane
From Vertex crane -- fixing


Quote:

The vertex crane drive is overheating, it stopped functioning. Service man will be here tomorrow morning.

I crane was just turned  on for for may be  about 5 minutes. The vertical drive was fine for a while, but the horizontal did not worked at all.

The crane is tagged out again and the controller box is cooling down.

 

  3624   Thu Sep 30 09:34:58 2010 steveUpdateGeneralvertex crane trolly drive fixed

Quote:

The vertex crane drive is overheating, it stopped functioning. Service man will be here tomorrow morning.

I crane was just turned  on for for may be  about 5 minutes. The vertical drive was fine for a while, but the horizontal did not worked at all.

The crane is tagged out again and the controller box is cooling down.

 Atm1, Vertex crane controller unit on horizontal I-beam.

            Module CCES-407 1HP 2.3A 460V/3 phase on the right was replaced. Speed was increased  to 30 Hz

Atm2, See burned insulation on black wire that was shorting to the large suppressor resistor on Atm3 One can see the pit marks on the right end of it.

        This large power dissipater resistor got hot as the malfunctioning controller 407 broke down.   Touching black power wire insulation melted and made a short.

          So the heat was created and finally the fuses were blown. The unnecessary large fuses were replaced by small ones.

Fortunately we had one spare controller on hand that made this repair to be done fast.

We used the new Crane Safety Check list  from LIGO-E1000379-v1 the first time yesterday before doors were removed.

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  3733   Mon Oct 18 09:01:48 2010 steveHowToGeneralHow not to

This BNC cable is crying for help. Please do not do this to me.  It should be reported  to the  abused center.Throw this cable into the garbage now.

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  3745   Wed Oct 20 16:41:41 2010 steveOmnistructureGeneral laser chiller leaving for MIT
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  3832   Mon Nov 1 10:17:55 2010 steveUpdateGeneralbreakers relabelled

Pedro of the electrical shop helped to retrace wires from the racks to the breakers. Many wrong labels were replaced. These labels are  still representing                          the south arm as Y and  the east arm as X.

Racks: 1X1,2,3,4 and 1Y3,4,5,6,7 and 9 are connected through manual disconnect swithes to  AC power breaker PC-1 on the west wall of IFO room 104.

             This panel PC-1 is connected to T1 isolation transformer in room 101 Panel L - # 38, 40, 42

Racks: 1Y1 & 2  psl and mc are connected through manual disconnect switches to AC power breaker PC-2 just west of the psl enclosure.

             This panel is connected to T2 isolation transformer in room 101 Panel L - # 32, 34, 36

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  3854   Wed Nov 3 16:49:31 2010 steveUpdateGeneralstorage cabinet is in place

The south end of IFO room 104 was reshuffled. The flow bench was moved all the way to the south end to create more room for the crane reach. The old  large drawing cabinet  was moved under the vacuum tube.

The new clear view through  Acrylic-plexyglass cabinet is anchored. It has powder finished coating so it will not out-gas too much.The back side shelf mounting holes are sealed off with kapton tape. The doors still needs some gaskit seals.

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  3862   Thu Nov 4 17:24:49 2010 steveUpdateGeneralconflat flanges for MIT

8 pieces of 10" CF blanks were shipped to MIT

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