 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
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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.
Here's |
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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
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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: |
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Thu May 16 12:41:28 2019, Chub, General, General, fire pillow found on optics table
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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. |
 Fri Jun 14 06:35:21 2013, Jeff, General, General, [LLO] L1 OMC status 
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https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=7410
Weights:
Suspension cage and transportation box: 250.8lb |
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Thu Apr 18 20:47:54 2019, Joe, Optics, , OMC initial alignment and locking
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[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 |
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Fri Apr 19 09:35:28 2019, Joe, General, , Adjusting cavity axis, re-alignment of OMC and locking
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[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, |
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Mon Apr 22 09:54:21 2019, Joe, General, , Shortening cavity (A5,A14,PZT11,PZT22) to get closer to design FSR
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[Koji,Joe,Philip,stephen]
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 |
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Tue Apr 23 10:21:12 2019, Joe, Optics, Configuration, Moving the spots to the centre of the curved mirrors
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[Koji,Philip, Liyuan, Joe]
CM1:
We moved the curved mirrors to these positions: |
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Wed Apr 24 13:58:51 2019, Joe, Optics, Characterization, OMC power budget and UV Epoxy Bonding of BS1
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[koji,philip,joe,liyuan,stephen]
need to add spot positions.
Mirrors: PZT11,PZT22, A14, A5 |
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Thu Apr 25 15:05:19 2019, Joe, Optics, Characterization, Looking at PZT HOM spacing dependance and thinking about workflow
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[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. |
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Fri Jun 15 15:45:49 2012, Koji, General, General, OMC Plan
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LIGO Document G1200683-v1:
aLIGO OMC fabrication and testing plan
aLIGO OMC wiki |
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Sat Jun 16 08:53:09 2012, Koji, General, General, To Do List
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Facility
Work
Replacing wooden work benches
W60" x H28-34" x D30" |
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Wed Jun 20 00:10:53 2012, Koji, Facility, General, Hole on the wall was patched
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Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July
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Facility/Supplies
Work in progress
Floor cleaning
Plug slits on the roof of the HEPA booth - blanking panels have been ordered |
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Wed Jul 18 23:20:13 2012, Koji, Optics, Characterization, Mode scan results of ELIGO
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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: |
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Mon Jul 23 17:15:14 2012, Koji, Clean, General, Talking with Margot
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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 |
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Tue Jul 24 11:41:29 2012, Koji, General, General, Useful references
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Nicolas Smith,
LIGO Document T0900383-v1
3mm Photodiode Characterization for Enhanced LIGO |
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Tue Jul 31 21:29:43 2012, Koji, General, General, Work completed in July [!]
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Completed Work: Facility/Supplies
Plug a big hole on the wall [ELOG]
Purchasing work benches |
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Tue Jul 31 21:33:17 2012, Koji, General, General, Plan Update: August [!]
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Completed work of the previous months: [Jul] [Aug] [Sep] [Oct] [Nov] [Dec]
Facility/Supplies
Work done
Floor |
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Wed Aug 1 19:35:00 2012, Koji, Facility, General, Floor cleaned / Workbench being built / Table top defect
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- The floor of the room was cleaned and waxed!
- Sticky mats are placed! Now we require shoe covers!
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Sat Aug 11 00:59:14 2012, Koji, Facility, General, Laser Safety Barrier
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It seemed that a laser safety barrier was installed today!?
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Mon Aug 13 16:59:11 2012, Koji, Clean, General, Room Cleaning Log
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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) |
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Mon Aug 13 17:01:35 2012, Koji, Clean, General, Particle Counts
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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". |
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Tue Aug 14 03:29:06 2012, Koji, Supply, General, Clean supply rack
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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.
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Wed Aug 22 20:16:43 2012, Koji, Facility, General, Workbenches have been installed / Clean room stools
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Last Friday, new workbenches were installed. Vladimir got a new table and a cleanroom stool.
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Tue Sep 25 14:18:14 2012, Koji, Clean, General, Particle Counts
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Particle counts
Before the prefilter is installed: 0.5um 1191cnts, 0.7um 346cnts
2:20 prefilter installed |
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Mon Oct 1 16:06:55 2012, Koji, Clean, General, Particle Counts
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1. It turned out that the particle counter MET ONE 227A at ATF shows
(particle count)/(0.1 ft^3)
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Fri Oct 5 03:39:58 2012, Koji, Optics, General, RoC Test setup
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Based on Zach's experiment design, I wrote up a bit more detailed optical layout for the mirror test.
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Mon Oct 8 11:30:47 2012, Koji, Optics, General, EG&G 2mm photodiode angle response
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| EGE&G 2mm photodiode angle response measured by Sam T1100564-v1 |
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Tue Oct 9 04:59:24 2012, Koji, Optics, General, OMC Test Optical Setup
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Tue Oct 9 05:03:15 2012, Koji, Electronics, General, OMC Test Electronics Setup
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Fri Oct 12 17:15:19 2012, Koji, Optics, General, Loan from the 40m / ATF
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HWP set
Optics: CVI QWPO-1064-08-2-R10
Mount: New Focus #9401
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Tue Oct 16 15:50:09 2012, Koji, General, General, Work completed in August/September [!]
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Work done
Floor cleaning
[ELOG]
Placing sticky
mats [ELOG]
Label Maker |
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Tue Oct 16 15:51:01 2012, Koji, General, General, Plan Update: October [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]
Facility/Supplies |
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Wed Oct 17 20:36:04 2012, Koji, Optics, General, RoC test cavity locked
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The RoC test setup has been built on the optical table at ATF.
The cavity formed by actual OMC mirrors have been locked. |
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Thu Oct 18 20:23:33 2012, Koji, Optics, Characterization, Improved measurement
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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 |
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Wed Nov 7 01:28:20 2012, Koji, Optics, Characterization, Wedge angle test (A1)
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Wedge angle test
Result: Wedge angle of Prism A1: 0.497 deg +/- 0.004 deg
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Wed Nov 7 20:21:42 2012, Koji, General, General, Work completed in October [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec] |
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Wed Nov 7 20:44:11 2012, Koji, General, General, Plan Update: November [!]
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Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec] |
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Thu Nov 8 13:24:53 2012, Koji, Optics, Characterization, More wedge measurement
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A1
Horiz Wedge 0.497 +/- 0.004 deg
Vert Wedge 0.024 +/- 0.004 deg |
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Thu Nov 8 19:47:55 2012, Koji, Electronics, Configuration, Solder for PZTs
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Rich saids:
I have ordered a small roll of solder for the OMC piezos.
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Thu Nov 8 19:52:57 2012, Koji, Optics, General, How to apply UV epoxy
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KA's question:
Do you know how to apply this epoxy?
Do we need a plunger and a needle for this purpose? |
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Thu Nov 8 20:12:10 2012, Koji, Optics, Configuration, How many glass components we need for a plate
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Optical prisms 50pcs (A14+B12+C6+E18)
Curved Mirrors 25pcs (C13+D12)
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Fri Nov 9 00:43:32 2012, Koji, Optics, Characterization, Further more wedge measurement
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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... |
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Sat Nov 17 02:31:34 2012, Koji, Optics, Characterization, Mirror T test
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Mirror T test
The mirror was misaligned to have ~2deg incident (mistakenly...) angle.
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Mon Nov 19 13:33:14 2012, Koji, Optics, Characterization, Resuming testing mirror RoCs
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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 |
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Mon Nov 26 01:40:00 2012, Koji, Optics, Characterization, More RoC measurement
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C1: RoC: 2.57845 +/− 4.2e−05m
C2: RoC: 2.54363 +/− 4.9e−05m
C3: RoC: 2.57130 +/− 6.3e−05m |
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Thu Nov 29 21:18:23 2012, Koji, Optics, General, OMC Mounting Prisms have come
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Tue Dec 18 20:04:40 2012, Koji, Optics, Characterization, Prism Thickness Measurement
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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. |
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Wed Dec 19 18:47:03 2012, Koji, Clean, General, First Contact Training with Margot
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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 |