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  40m Log, Page 322 of 339  Not logged in ELOG logo
ID Date Authorup Type Category Subject
  4701   Thu May 12 09:00:23 2011 steveUpdateGeneraloptical table covers must be used

I found ITMX-ISCT and BS-ISCT ( IFO sensing-control table)  not covered this morning. Please do not leave tables open.

  4728   Mon May 16 17:11:28 2011 steveUpdateElectronicsstrain relieved 1X1

1X1 is strain relieved in the back. I will use similar approach on the rest of the racks .

Attachment 1: P1070724.JPG
  4750   Thu May 19 17:53:03 2011 steveUpdateCDSAA filter box modified at 1X5


[Steve, Joe]

Steve pulled the top AA filter box from 1X5 which handled some of the suspensions channels.  We turned off all the watchdogs before pulling it out, as well as recorded which cables were connected to which inputs.

The case  is undergoing a structural modification to have the ADC adapter card which previously was loosely connected via cables, securely attached to the case.

Steve still wants to do some cabling in the rack while the box is out, and will return it this afternoon once he has finished that.

 Job is done. Sus damping are back on. Cabling-strain reliefing are  not finished yet at 1X5 and 1X4

Attachment 1: P1070727.JPG
  4768   Fri May 27 17:52:53 2011 steveUpdateLSCLSC rack cables strain relieved & labeled

LSC rack 1Y2 cables are strain relieved and labeled. Spare and/or obsolete cables are laid out on the top of the beam tube and on the outside of the rack.

The POY 110 MHZ demodboard has a very touchy position in the VME crate. Watch out for it! It has to be fixed.

  4771   Tue May 31 11:34:13 2011 steveSummarySAFETYsafety glasses checked

  1064 nm transmison were measured of 40m safety glasses as shown . Their performance did not degrade. They are as good as their labels.

Attachment 1: P1070823.JPG
  4775   Tue May 31 17:30:42 2011 steveUpdateSUSETMY damping restored

ETMY's watch dogs were found tripped. They were restored.

  4784   Fri Jun 3 18:12:03 2011 steveUpdateComputersno PEM channels

AA filter box was removed and modified at 1Y7 today. The -5V power supply was current limited when I plugged it back in. It was removed for medical attention.

NO PEM channels available! because of this.


  4789   Mon Jun 6 17:28:31 2011 steveUpdateComputersstill, no PEM channels


AA filter box was removed and modified at 1Y7 today. The -5V power supply was current limited when I plugged it back in. It was removed for medical attention.

NO PEM channels available! because of this.


 D68L8EX-850Hz filter chips were removed and bypassed-shorted as Rana's entry on March 17, 2006 in old elog.

This unit is still has a short somewhere.

Attachment 1: P1070846.JPG
  4794   Tue Jun 7 16:11:09 2011 steveUpdateCamerasITM camera lenses changed

Computar  75-12.5 zooms were installed for closer look at the resonant spots.  Their alignment and focus needs more loving adjustment.

Atm 1, ITMX  (  it was 10-40 mm Tamron before )

Atm 2, ITMY  ( it was 12mm wide angle showing the towers  before )

Attachment 1: P1070865.JPG
Attachment 2: P1070860.JPG
  4798   Thu Jun 9 10:38:30 2011 steveUpdatePSLPMC needs help

The PMC is losing power.

Attachment 1: pmcnothp.jpg
  4814   Tue Jun 14 09:24:36 2011 steveConfigurationPhotosSUS binary IO chassis 2 and 3 moved from 1X5 to 1X4


While preping 1X4 for installation of c1lsc, we removed some old VME crates that were no longer in use.  This freed up lots of space in 1X4.  We then moved the SUS binary IO chassis 2 and 3, which plug into the 1X4 cross-connect, from 1X5 into the newly freed space in 1X4.  This makes the cable run from these modules to the cross connect much cleaner.

 Are we keeping these?

Attachment 1: P1070891.JPG
Attachment 2: P1070893.JPG
  4828   Thu Jun 16 08:45:14 2011 steveUpdateSUSVertex SUS Binary Output Boxes removed


- I was investigating the SUS whitening issue.

- I could not find any suspension which can handle the input whitening switch correctly.

- I went to 1X5 rack and found that both of the two binary output boxes were turned off.
As far as I know they are pulling up the lines which are switched by the open collector outputs.

- I tried to turn on the switch. Immediately I noticed the power lamps did not work. So I need an isolated setup to investigate the situation.

- The cables are labelled. I will ask steve to remove the boxes from the rack.

 I shut down damping to the Vertex optics and removed Binary IO  Adapter chassy BO0 and BO1

About a week ago I discussed the BO0's power indicator lights with Kiwamu. They were  not on or they were blinking on-off.

I put screws into ps connectors in the back, but it did not helped.

Attachment 1: P1070894.JPG
  4831   Fri Jun 17 08:03:48 2011 steveUpdateSUSITMY sus damping restored

ITMY sus damping restored.


  4836   Mon Jun 20 09:04:13 2011 steveUpdateSUSETMX damping restored

ETMX sus damping restored

  4842   Mon Jun 20 16:44:02 2011 steveUpdateABSLI-P curve of LightWave M126-1064-700


 Put the serial numbers into the elog. So we can identify the laser and controller in the future.

The old days the NPRO ( inside the MOPA ) was running ~1.7A  500 mW

  4847   Tue Jun 21 16:11:13 2011 steveUpdateSAFETYsurf safety training

40m surfs:  Nicole Ing, Iswita Saikia and Sonali Mohapatra received 40m specific safety training  today.

Attachment 1: P1070902.JPG
  4865   Thu Jun 23 10:17:49 2011 steveUpdatePSLAP table is open to PSL again

Access to the north side of the PSL table is blocked by the    8" beam guard. This opens the beam pathways between them.

Attachment 1: P1070911.JPG
Attachment 2: P1070910.JPG
  4866   Thu Jun 23 10:35:12 2011 steveUpdateComputersold computers leaving the lab

Rod Luna picked up these computers for Larry Wallace yesterday: Dell Inspiron 530, Dell Dimension 4600 and SunBlade 1000

Attachment 1: P1070905.JPG
Attachment 2: P1070904.JPG
Attachment 3: blade1000.JPG
  4876   Fri Jun 24 07:40:23 2011 steveUpdateSUSPRM damping restored

The PRM sus damping restored. C1:SUS-PRM_SDPD_VAR is still 20-30mV and going up.  Side gain  turned on. This pulled it down to 5-8 mV

Why is the side osem sensing voltage 4.4V ? It can not be higher than ~2.4V.......something is rotten in the state of Denmark?

Edit by KI:

 It's because Valera increased the transimpedance gain of the PRM SIDE OSEM to match the signal level to the new ADC range (#3913 ).

  4877   Fri Jun 24 07:49:23 2011 steveUpdateABSLI-P curve of LWE with serial numbers


 The I-P curve was measured again, but this time in a lower current range of 1.0-1.9 [A].

Quote from #4842

The old days the NPRO ( inside the MOPA ) was running ~1.7A  500 mW

 Lightwave Laser Head M126-1064-700   sn238,  mounted on full size Al base and side heat sink on

Controller 125/126 Smart Supply   sn 201M

  4878   Fri Jun 24 10:38:01 2011 steveUpdateCamerasITMY camera gets fixed

ITMY gets new Tamron M118FM50 that has improved close focusing. It is a small fixed focal length camera so the video tube cover can be put on.

The Watec LCL-902K 1/2" ccd camera was losing it power supply voltage because of bad connection. It was replaced.

  4891   Mon Jun 27 16:57:06 2011 steveUpdatePhotosHaixing is back

He has moved the levitation stuff for his surf student to Jan's lab in W-Bridge.

Attachment 1: P1070914.JPG
  4896   Tue Jun 28 10:11:13 2011 steveUpdateIOOPower incident on REFL11 and REFL55


I measured the power incident on REFL11 and REFL55.  Steve was concerned that it is too high.  If we consider this elog the incident power levels were REFL11: 30 mW and REFL55: 87 mW. (assuming efficiency of ~ 0.8 A/W @1064nm for the C30642 PD).  However, currently there is a combination of Polarising BS and Half-waveplate with which we have attenuated the power incident on the REFL PDs.  We now have (with the PRM misaligned):

REFL11:  Power incident = 7.60 mW ;  DC out = 0.330 V  => efficiency = 0.87 A/W

REFL55:  Power incident = 23 mW ;  DC out = 0.850 V  => efficiency = 0.74 A/W

and with the PRM aligned::

REFL11:  DC out = 0.35 V  => 8 mW is incident

REFL55: DC out = 0.975 V  => 26 mW is incident

These power levels may go up further when everything is working well.

The max rated photo-current is 100mA => max power 125mW @0.8 A/W.


What is the power level on MC_REFL_ PDs and WFS  when the MC is not locked?

  4900   Tue Jun 28 15:23:21 2011 steveUpdateElectronicsCoilcraft RF-design kits are restocked

Our design kits are full again. They are waiting for a new brilliant PD design.

Attachment 1: P1070917.JPG
Attachment 2: P1070915.JPG
  4909   Wed Jun 29 11:45:54 2011 steveUpdateGeneralwhere are we storing PDs ?

Photo diodes stored in the east arm cabinet E4:  ALL PDs  meet here, fast  or slow......

Attachment 1: P1070921.JPG
  4924   Thu Jun 30 17:24:46 2011 steveUpdateSAFETYsafety interlocks

Lightwave M126-1064-700 lasers  sn415  at east end of the Y arm and  sn201 at the AP table  are connected individually  to one each EMERGENCY LASER SHUT OFF SWITCH. 

Attachment 1: P1070949.JPG
Attachment 2: P1070948.JPG
  4937   Tue Jul 5 08:32:38 2011 steveUpdatePEMbad air quality in the lab

The fireworks of yesterday showing up in the lab. Pasadena out side air 6.6 million  cfm for 0.3 micron particles  and 1.5 million cfm for 0.5 micron size.

Attachment 1: badaq.jpg
Attachment 2: july4pem.jpg
  4938   Tue Jul 5 13:35:56 2011 steveUpdateSUSPRM damping restored

The PRM sus damping was restored. It's side rms motion came down from 35 to 4 mV immediately.      Lab   air quality is back to normal.


  4952   Thu Jul 7 10:25:34 2011 steveHowToGeneralcleaning out refregerator

Please ask the owner unless  it is rotten. Do not put food into garbage can inside. Take them outside so you are not inviting ants !

  4953   Thu Jul 7 13:57:28 2011 steveHowToSAFETYhow not to

I found baked allen keys on the top of the clean optics cabinet.  Somewhat heavy box that can come down in an earthquake on our heads.

NOTHING SHOULD GO ON THE TOP OF THE CABINETS OR RACKS except  small plastic boxes that storing our clean clothing.

  4960   Mon Jul 11 14:03:37 2011 steveHowTolorehow to visit your old lab

Alberto is visiting us from Australia. He brought some terrific presents. It is going to be very demanding task to wait for the rest of the 40m team

to return from Wales to taste coffee:  PNG Peaberry of Wagonga, Monsooned Malabar of Jindebah and Signature Blue Blend of Cosmorex.

Attachment 1: P1080069.JPG
  4976   Fri Jul 15 16:14:00 2011 steveUpdateSUSBS oplev error signal spectra
Attachment 1: BS_opl_ersig.pdf
  4981   Mon Jul 18 10:24:48 2011 steveHowToGeneralsolvent bottles for cleaning optics

Each bottle has matched seals. They are not interchangeable.

It is critical that the solvent do not reach the rubber bulb. Practice with the pipet.

In case of solvent touching the suction bulb: do not let the solvent go back into the bottle! Remove bulb, let it dry out and rinse pipet.

It is essential that the solvent bottle must be rinsed and refilled if it's content met with the rubber bulb.

Use glass syringe with SS needle in critical application: Hamilton ~0.1 ml

Attachment 1: P1080090.JPG
  4983   Mon Jul 18 15:51:04 2011 steveUpdateSUSETMY spectra of oplev error signal
Attachment 1: ETMYopler.png
  4987   Tue Jul 19 09:19:14 2011 steveUpdateSUSPRM damping restored

The PRM watchdogs were tripped. The side was kicked up to 180mV Damping was restored.

  4989   Tue Jul 19 10:54:14 2011 steveUpdateGenerallarge sensor card can not be found

Please return sensor card to  laser log box so others can use it. We have only one larger fluorescent sensor card.

  5001   Wed Jul 20 14:42:34 2011 steveUpdateSUSoplev gains today

C1:SUS-ETMX_OLPIT_GAIN set to 1.0     OLYAW 1.0

                ETMY                                     -0.2                   -0.2

                ITMY                                        2.0                    -2.0

                ITMX                                        0.5                     0.5

                  BS                                          0.4                    -0.4

                PRM                                         0.5                    -0.7

                SRM                                         1.0                     1.0

Earlier today Rana and I made power spectra of ETMY_OPLEV_ERROR signals with servo on and off.

It was indicating that the servo is not doing anything. These gain values were not set since IFO rebuilt.

Valera's entries were searched also. He did not do such thing. Rana may know where it is in the elog if it happened.

  5011   Thu Jul 21 10:08:30 2011 steveUpdateSUSsus sensor summary

OSEM voltages to be corrected at upcoming vent: threshold ~ 0.7-1.2V, ( at 22 out of 50 )










Attachment 1: sus_sensor.png
  5014   Thu Jul 21 16:06:35 2011 steveUpdateSUSoplev gains today checked by conlog

 Present values agree with conlog records. It can be concluded that there were no big changes made. There are some 0.1-0.2 gain  and one polarity changes during the periods of Valera's visits.


  5016   Fri Jul 22 10:13:41 2011 steveUpdateVACRGA scan at day 213
Attachment 1: pd70m213scan.jpg
  5017   Fri Jul 22 10:24:34 2011 steveUpdateVACpressure plot at day 213

Dec 21, 2010 we pumped down the MARK4 rebuilt 40m-IFO and the malev has been pumping on it since than

Attachment 1: p.jpg
  5029   Mon Jul 25 11:46:28 2011 steveUpdateSUSETMY sus problem hunt

[Kiwamu / Steve]

We checked some electronics noise on the ETMY shadow sensor system.

Noise from the WF, AA board and ADC are below the shadow sensor spectra on ETMY.

It means something funny is going on in the upstream side (including the satelight box and shadow sensors)

OR the coil drivers side are going crazy ??


As Rana pointed out in his entry (#5025), the spectra of the shadow sensors on ETMY were quite bad below 3 Hz. The floor are higher than that of ETMX by factor of 10 or so.

To check if the noise comes from some of the electronics, we disconnected D15-sub from pd to whitening in.

The spectra with/without shadow sensors are attached below.

The curves in brown and green are the ones taken when the shadow sensors were disconnected from the WF board.

So these two curves represent the summed noise of the WF, AA and ADC.

This tells us to look toward the OSEM.


Attachment 1: ETMY_AA_ADC.png
  5037   Tue Jul 26 11:38:45 2011 steveUpdateSUSETMY bias checked


 I test drove ETMY biases.

PITCH  worked well in slow and fast modes. Slow drive was from the IFO alignment screen C1:SUS-ETMY_PIT_COM and

the fast one from C1:SUS-ETMY_ASCPIT_OFFSET

YAW did not.  It was always diagonal. It was  specially bad with the fast drive. I compared them with ETMX. ETMX yaw is diagonal a little bit too.

The OPLEV return spots on the qpd ETMX and ETMY are big 5-6 mm diameter. The ETMY spot has weird geometry to qpd.

  5043   Wed Jul 27 10:10:12 2011 steveUpdatePSLlocking status

 80 days: PMC is drifting

Attachment 1: 80dpmcMC.jpg
  5047   Wed Jul 27 15:38:01 2011 steveUpdateVACbeam traps for vacuum

We have cleaned, baked, rga scaned traps for vacuum. Thorlabs LB1 on 1" OD ss posts and forks. The effective surface area is 43 x 18 mm of stacked razors.

Seven pieces are mounted on New Focus #9962  1" OD SS vented-  pedestrals to 5.5" center height and 5 pieces to 4.875"

Attachment 1: P1080095.JPG
  5050   Wed Jul 27 15:49:56 2011 steveUpdateSAFETYManuel receives safety training

Our surf student Manuel Marchiò received 40m specific safety training today.

Attachment 1: P1080096.JPG
  5055   Thu Jul 28 16:26:42 2011 steveUpdateSUSITMX, ITMY & ETMY OSEM gains adjusted


OSEM damping gains were adjusted by observing  real time dataviewer to get Q of 5

OSEMs were kicked up one by one with 200 counts  ~1sec. The error signal was optimized to get 1/2 of exitation amplitude at the 5th sinusoid wave.

C1: SUS-ITMX_SUSPOS_N1 gain   111      ->        65,             PIT        7.2      ->    8,           YAW        12      ->     6,          SIDE     280

                  ITMY                                      277       ->     120,                        19.2     ->     7,                             24     ->     19,                        420    ->      470

                  ETMY                                       10        ->       32,                          20      ->     3,                             20     ->     10,                          50

                  ETMX                                       22        ->      25,                             3,                                                3,                                              -170  

ETMX having problems:  1, YAW can not be excited

                                             2, SIDE has no error signal in dataviewer. Sensing voltage on MEDM screen 0.142V




  5061   Fri Jul 29 16:04:51 2011 steveUpdateSUSETMX, PRM & SRM OSEM gains set

Jamei fixed the computer. Now I had a healthier ETMX with SIDE signal that allowed me to set gains to get Q of 5

The Y arm restore locked the arm at TRY -out 2.4V,    the X arm still did not lock or align to lock. It has some fringes.

ETMX  POS gain   22  -> 17,              PIT  3  ->  1,                    YAW  3,                     SIDE     -170    ->    -110

PRM                        50  ->  30,                     1,                                       2,                                       50

SRM                        55  ->  20,                    2.4  ->  1.5,                      4.8  ->  2,                          140   ->    100

Now all SUS OSEM gains are set

  5080   Mon Aug 1 08:52:37 2011 steveUpdateVACpreparation to vent

Both arms locked easely around 1V transmited.  We should recenter oplevs.

Attachment 1: pztsteering.png
Attachment 2: vac1Aug2011.png
Attachment 3: PEM200d.jpg
  5082   Mon Aug 1 16:06:05 2011 steveUpdateSUSoplevs are centered

Kiwamu, Koji and Steve,

Arm aligned separatly and oplev qpds were centered  including BS. Than we realigned manually DRM and centered their qpds.

ALL SUS oplevs were centered to resonating cavities.

ELOG V3.1.3-