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New entries since:Wed Dec 31 16:00:00 1969
    Reply  Thu Sep 27 20:19:15 2018, Aaron, Optics, General, Montecarlo simulation of the phase difference between P and S pols for a modeled HR mirror 
I started some analytic calculations of how OMC mirror motion would add to the noise in the BHD. I want to make some prettier plots, and am adding the
interferometer so I can also compute the noise due to backscatter into the IFO. However, since I've pushed the notebook I wanted to post an update.
    Reply  Thu Nov 1 19:57:32 2018, Aaron, Optics, General, Montecarlo simulation of the phase difference between P and S pols for a modeled HR mirror 
I'm still not satisfied/done with the solution to this, but this has gone too long without an update and anyway probably someone else will have a
direction to take it that prevents me spinning my wheels on solved or basic questions.

The story will have to wait to be on the elog, but I've put it in the jupyter notebook. Basically:
    Reply  Thu May 16 12:41:28 2019, Chub, General, General, fire pillow found on optics table 
That is an expanding fire pillow, also known as firebrick.  It is used to create a fire block where holes in fire-rated walls are made and prevents
lab fires from spreading rapidly to adjacent labs.  I had to pull cable from B254 to our labs on either side during a rather narrow window of time. 
Some of the cable holes are partially blocked, making it difficult to reach the cable to them. The cable is then just guided to the hole from a distance. 
Entry  Fri Jun 14 06:35:21 2013, Jeff, General, General, [LLO] L1 OMC status preamp_arrangement.png
Suspension cage and transportation box: 250.8lb
Entry  Thu Apr 18 20:47:54 2019, Joe, Optics, , OMC initial alignment and locking IMG_7676.JPGIMG_7666.JPGIMG_7670.JPGIMG_7883.JPGIMG_7882.JPG
[Joe, Phillip, Koji, Stephen]

*draft post, please add anymore info if I missed something*

made initial alignment of the cavity. To do this we used the periscope mirrors to aim the incoming beam at the centre of the
Entry  Fri Apr 19 09:35:28 2019, Joe, General, , Adjusting cavity axis, re-alignment of OMC and locking FSR_Scan_Fitfsrdata.pdfIMG_7679_cropped.jpg
[koji,philip, joe, liyuan, steven]

*still need to add photos to post*

PZT 11 was removed and inspected for so dust/dirt on the bottom of the prism. We saw a spot. We tried to remove this with acetone,
Entry  Mon Apr 22 09:54:21 2019, Joe, General, , Shortening cavity (A5,A14,PZT11,PZT22) to get closer to design FSR CM1_IMG_7699.jpgCM2_IMG_7697.jpg

in units 20um per div on the micrometer [n.b. we reailised that its 10um per div on the micrometer]

CM1 inner screw pos: 11.5
Entry  Tue Apr 23 10:21:12 2019, Joe, Optics, Configuration, Moving the spots to the centre of the curved mirrors FSR_detuned_locking.pdfCM1_IMG_7702.JPGCM2_IMG_7704.JPG
[Koji,Philip, Liyuan, Joe]


We moved the curved mirrors to these positions:
Entry  Wed Apr 24 13:58:51 2019, Joe, Optics, Characterization, OMC power budget and UV Epoxy Bonding of BS1 

need to add spot positions.

Mirrors: PZT11,PZT22, A14, A5
Entry  Thu Apr 25 15:05:19 2019, Joe, Optics, Characterization, Looking at PZT HOM spacing dependance and thinking about workflow 
[koji, joe]

The template or glass breadboard was wobbling, and we noticed that the caivty alignment became worse/better when it was pressed down. We saw
that it was the glass breadboard, so it was fixed into the transport fixture more securely. Now its alignement didn't change when it was pressed down.
Entry  Fri Jun 15 15:45:49 2012, Koji, General, General, OMC Plan 
LIGO Document G1200683-v1: 
aLIGO OMC fabrication and testing plan
aLIGO OMC wiki
Entry  Sat Jun 16 08:53:09 2012, Koji, General, General, To Do List 

        Replacing wooden work benches
       W60" x H28-34" x D30" 
Entry  Wed Jun 20 00:10:53 2012, Koji, Facility, General, Hole on the wall was patched P6191706.jpg
Entry  Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July P7071878.jpg

    Work in progress     
        Floor cleaning
        Plug slits on the roof of the HEPA booth - blanking panels have been ordered 
Entry  Wed Jul 18 23:20:13 2012, Koji, Optics, Characterization, Mode scan results of ELIGO 
Nic Smith sent me a bunch of elog lists where the results of the mode scan can be found.
From Nic:
There have been many mode scan analyses done at LLO:
Entry  Mon Jul 23 17:15:14 2012, Koji, Clean, General, Talking with Margot 
I consulted with Margot about the cleaning of the optics

    Optics are considered as a clean object. Large dusts can be removed by ionized N2 flow etc.
    Barrel of optics can be wiped
with Acetone.
    Optical surfaces are best to be cleaned by First Contact.
    A peek
Entry  Tue Jul 24 11:41:29 2012, Koji, General, General, Useful references 
Nicolas Smith,
LIGO Document T0900383-v1 
3mm Photodiode Characterization for Enhanced LIGO
Entry  Tue Jul 31 21:29:43 2012, Koji, General, General, Work completed in July [!] 

    Completed Work: Facility/Supplies
        Plug a big hole on the wall [ELOG]
        Purchasing work benches
Entry  Tue Jul 31 21:33:17 2012, Koji, General, General, Plan Update: August [!] 
Completed work of the previous months: [Jul] [Aug] [Sep] [Oct] [Nov] [Dec]


    Work done
Entry  Wed Aug 1 19:35:00 2012, Koji, Facility, General, Floor cleaned / Workbench being built / Table top defect P8011949.JPGP8011947.JPGP8011948.JPG
- The floor of the room was cleaned and waxed!
- Sticky mats are placed! Now we require shoe covers!
Entry  Sat Aug 11 00:59:14 2012, Koji, Facility, General, Laser Safety Barrier P8131960.JPG
It seemed that a laser safety barrier was installed today!?
Entry  Mon Aug 13 16:59:11 2012, Koji, Clean, General, Room Cleaning Log 
Floor wiped with a wet wiper (Aug 13, 2012)
Floor wiped with a wet wiper (Aug 15, 2012)
Floor wiped with a wet wiper (Sep 25, 2012)
Entry  Mon Aug 13 17:01:35 2012, Koji, Clean, General, Particle Counts 
Aug 13, 2012 / 0.5um 1000~2000/(0.1 cu ft) / 0.7um   400-600/(0.1 cu ft) by ATF particle counter (MET ONE 227A)
They are counts/(0.1 ft^3)! These numbers should be multiplied by 10 to know the particle "CLASS".
Entry  Tue Aug 14 03:29:06 2012, Koji, Supply, General, Clean supply rack P8131959.JPGP8131961.JPG
Clean supplies & some cleaning tools are located at the right side of the entrance.
The file cabinet there was moved to the left side of the door, but will be removed eventually.
Entry  Wed Aug 22 20:16:43 2012, Koji, Facility, General, Workbenches have been installed / Clean room stools P8171968.jpgP8171969.jpg
Last Friday, new workbenches were installed. Vladimir got a new table and a cleanroom stool.
Entry  Tue Sep 25 14:18:14 2012, Koji, Clean, General, Particle Counts 
Particle counts
Before the prefilter is installed: 0.5um 1191cnts, 0.7um 346cnts
2:20 prefilter installed
    Reply  Mon Oct 1 16:06:55 2012, Koji, Clean, General, Particle Counts 
1. It turned out that the particle counter MET ONE 227A at ATF shows 
(particle count)/(0.1 ft^3) 
Entry  Fri Oct 5 03:39:58 2012, Koji, Optics, General, RoC Test setup RoC_test_setup.pdfRoC_test_setup.png
Based on Zach's experiment design, I wrote up a bit more detailed optical layout for the mirror test.
Entry  Mon Oct 8 11:30:47 2012, Koji, Optics, General, EG&G 2mm photodiode angle response 
EGE&G 2mm photodiode angle response measured by Sam T1100564-v1
Entry  Tue Oct 9 04:59:24 2012, Koji, Optics, General, OMC Test Optical Setup OMC_test_setup.pngOMC_test_setup.pdf

Entry  Tue Oct 9 05:03:15 2012, Koji, Electronics, General, OMC Test Electronics Setup electronics_setup.pngelectronics_setup.pdf
Entry  Fri Oct 12 17:15:19 2012, Koji, Optics, General, Loan from the 40m / ATF 

    HWP set
        Optics: CVI QWPO-1064-08-2-R10

       Mount: New Focus #9401
Entry  Tue Oct 16 15:50:09 2012, Koji, General, General, Work completed in August/September [!] 

    Work done
        Floor cleaning
        Placing sticky
mats [ELOG]
        Label Maker
Entry  Tue Oct 16 15:51:01 2012, Koji, General, General, Plan Update: October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]

Entry  Wed Oct 17 20:36:04 2012, Koji, Optics, General, RoC test cavity locked detailed_RoC_setup.pdfomc_cav_lock_SCRN_SHOT.pngCav_scan_response_20121016.pdf
The RoC test setup has been built on the optical table at ATF.

The cavity formed by actual OMC mirrors have been locked.
Entry  Thu Oct 18 20:23:33 2012, Koji, Optics, Characterization, Improved measurement Cav_scan_response_zoom_20121017.pdfdetailed_RoC_setup.pdf
Significant improvement has been achieved in the RoC measurement.

    The trans PD has much more power as the BS at the cavity trans was replaced by a 50% BS. This covers the disadvantage of using the a
Si PD.
    The BB EOM has a 50Ohm terminator to ensure the 50Ohm termination at Low freq.
    The length of the cavity was changed
Entry  Wed Nov 7 01:28:20 2012, Koji, Optics, Characterization, Wedge angle test (A1) wedge_measurement.pngwedge_measurement_setup.png
Wedge angle test
Result: Wedge angle of Prism A1: 0.497 deg +/- 0.004 deg

Entry  Wed Nov 7 20:21:42 2012, Koji, General, General, Work completed in October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
Entry  Wed Nov 7 20:44:11 2012, Koji, General, General, Plan Update: November [!] OMC_Project_Schedule.pdf
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
Entry  Thu Nov 8 13:24:53 2012, Koji, Optics, Characterization, More wedge measurement wedge_measurement_overall.pdf
Horiz Wedge    0.497    +/-    0.004 deg
Vert Wedge      0.024    +/-    0.004 deg
Entry  Thu Nov 8 19:47:55 2012, Koji, Electronics, Configuration, Solder for PZTs 
Rich saids:
I have ordered a small roll of solder for the OMC piezos. 
Entry  Thu Nov 8 19:52:57 2012, Koji, Optics, General, How to apply UV epoxy UVepoxy.jpg
KA's question:
Do you know how to apply this epoxy? 
Do we need a plunger and a needle for this purpose?
Entry  Thu Nov 8 20:12:10 2012, Koji, Optics, Configuration, How many glass components we need for a plate 
Optical prisms 50pcs (A14+B12+C6+E18)
Curved Mirrors 25pcs (C13+D12)

Entry  Fri Nov 9 00:43:32 2012, Koji, Optics, Characterization, Further more wedge measurement wedge_measurement_overall.pdf121108a_A1.pdf
Now it's enough for the first OMC (or even second one too).
Today's measurements all distributed in theta>0.5deg. Is this some systematic effect???
I should check some of the compeled mirrors again to see the reproducibility...
Entry  Sat Nov 17 02:31:34 2012, Koji, Optics, Characterization, Mirror T test 
Mirror T test
The mirror was misaligned to have ~2deg incident (mistakenly...) angle.
    Reply  Mon Nov 19 13:33:14 2012, Koji, Optics, Characterization, Resuming testing mirror RoCs Cav_scan_response_zoom_20121016.pdf
In order to resume testing the curvatures of the mirrors, the same mirror as the previous one was tested.
The result looks consistent with the previous measurement.
It seems that there has been some locking offset. Actually, the split peaks in the TF@83MHz indicates 
Entry  Mon Nov 26 01:40:00 2012, Koji, Optics, Characterization, More RoC measurement RoC_measurement.pdf
C1: RoC: 2.57845 +/− 4.2e−05m
C2: RoC: 2.54363 +/− 4.9e−05m
C3: RoC: 2.57130 +/− 6.3e−05m    
Entry  Thu Nov 29 21:18:23 2012, Koji, Optics, General, OMC Mounting Prisms have come PB293030.JPGPB293032.JPG

Entry  Tue Dec 18 20:04:40 2012, Koji, Optics, Characterization, Prism Thickness Measurement prism.png
The thicknesses of the prism mirrors (A1-A5) were measured with micrometer thickness gauge.
Since the thickness of the thinner side (side1) depends on the depth used for the measurement,
it is not accurate. Unit in mm.
    Reply  Wed Dec 19 18:47:03 2012, Koji, Clean, General, First Contact Training with Margot 
Steve and I visited Margot to have a training session for application of First Contact on optics.
- Make "thick" layer of first contact. It becomes thin when it gets dried.
- Apply more FC once a peek sheet is placed on the FC
ELOG V3.1.3-