 Thu Jul 31 15:07:53 2014, Koji, General, General, Item lending
|
Tara: Laser Safety goggle -> Returned
Evan:
HP signal generator (990MHz) (prev. setting 32.7MHz / +3dBm) |
|
Mon Aug 4 18:59:50 2014, Koji, General, General, A memorandom
|
On breadboarfd cabling for 3IFO OMC
D1300371 - S1301806
D1300372 - S1301808 |
|
Tue Aug 5 13:03:25 2014, Koji, General, General, Missing cable components
|
DCPD Connector Face: Qty2 https://dcc.ligo.org/LIGO-D1201276
QPD Connector Face: Qty2 https://dcc.ligo.org/LIGO-D1201282
PD faster: 92210A07 Qty 4: MCMASTER #2-56 x .25 FHCS |
|
Sat Jan 17 11:40:04 2015, Koji, General, General, 3rd OMC completed
|
Jan 15, 2015 3rd OMC completed
The face caps of the DCPD/QPD cables were installed (Helicoils inserted)
PD7&10 swapped with PD11(for DCPD T) and PD12(DCPD R). |
 Fri Jan 30 19:31:08 2015, Koji, General, General, Item lending
|
Gabriele:
PZT HV Amp
Evan: |
|
Tue Feb 3 18:23:49 2015, Koji, General, General, Item lending
|
- The laser was removed and shipped to LHO today.
- UV illuminator / fused silica fiber light guide / UV power meter / UV face shield (Qty 2) will be shipped to MIT.
They are CIT properties except for the illuminator. |
Wed Feb 4 20:07:24 2015, Koji, General, General, Item lending 
|
Shipment to MIT (L. Barsotti, J. Miller)
1. UV Illuminator (LESCO Super Spot MK III)
2. UV Power meter (American Ultraviolet AIB1001) Caltech property C30140 |
|
Wed Feb 18 21:51:23 2015, Koji, General, General, Notes on OMC Transportation Fixtures & Pelican
|
LLO has one empty OMC transportation fixture.
LHO has one empty OMC transportation fixture.
LHO has one OMC transportation fixture with 3IFO OMC in it. |
|
Tue Jul 21 20:20:12 2015, Koji, General, General, Item lending
|
Kate (ATF)
- 4ch color oscilloscope (Tektronix)
- Chopper controller |
|
Thu Aug 20 01:35:01 2015, Koji, Electronics, General, OMC DCPD in-vacuum electronics chain test
|
We wanted to know the transimpedance of the OMC DCPD at high frequency (1M~10M).
For this purpose, the OMC DCPD chain was built at the 40m. The measurement setup is shown in Attachment 1.
- As the preamp box has the differential output (pin1 and pin6 of the last DB9), pomona clips were used to measure the transfer functions |
|
Wed Aug 26 11:31:33 2015, Koji, Electronics, General, OMC DCPD in-vacuum electronics chain test
|
| The noise levels of the output pins (pin1/pin6) are measured. Note that the measurement is done with SE. i.e. There was no common mode noise rejection. |
|
Sun Sep 6 16:50:51 2015, Koji, Electronics, General, Unit test of the EOM/AOM Driver S1500118
|
TEST Result: S1500118
Additional notes
- Checked the power supply. All voltages look quiet and stationary. |
|
Tue Dec 29 12:15:46 2015, Koji, General, General, Glasgow polarizer passed to Kate
|
| The Glasgow polarizer was passed to Kate on Dec 17, 2015. |
|
Fri Jul 22 22:24:05 2016, Koji, General, General, HQEPD inventory
|
As of Jul 22, 2016
As of Aug 11, 2016
As of Aug 16, 2016 |
|
Mon Aug 15 10:09:10 2016, Koji, General, General, Prev H1 OMC shipped to CIT
|
Previous H1 OMC shipped from LHO to CIT
https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196 |
|
Mon Aug 22 12:58:16 2016, Koji, General, General, UV bond samples -> Garilynn
|
- FS base + Mounting Prism
- FS or SF2 1/2" piece + FS or SF2 1/2" piece
- FS? plate + FS or SF2 1/2" piece + FS or SF2 1/2" piece + FS? plate |
|
Fri Sep 9 14:34:31 2016, Koji, General, General, Item lending
|
To 40m
First Contact Kit by Calum
Class A Kapton sheets |
|
Fri Sep 9 19:43:32 2016, Koji, Optics, General, D1102211 OMC Diode Mount Glass Block went to Downs
|
| D1102211 OMC Diode Mount Glass Block (11pcs) have been given to Calum@Downs |
|
Mon Nov 21 21:19:20 2016, Koji, Optics, General, LWE NPRO Laser / Input Optics / Fiber Coupling
|
- About 1.5 month ago, an 700mW LWE NPRO has been brought to OMC Lab.
- The SOP can be found here.
- The base was made for the beam elevation of 3" height. Four 1" pedestals were attached to rise the beam elevation to 4". |
|
Wed Dec 7 19:18:10 2016, Koji, Optics, General, LWE NPRO Laser / Input Optics / Fiber Coupling
|
FIber Input Mount 132deg
Fiber output mount 275deg
-> 525mW P: 517mW S: 8mW extinction ratio: 0.016 |
|
Wed Dec 7 21:18:35 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned
|
The OMC mode matching sled was fixed on the nominal part of the table. Then the OMC was located at the nominal position marked by three poles.
The input periscope was adjusted to have the input beam roughtly centered on the OMC QPDs. This made the beam from FM2 aligned to the missing
CM1, and the beam just went through the hole of the mounting prism. Very promising! |
|
Thu Dec 8 21:17:09 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned
|
The OMC cavity was locked. The alignment was precisely adjusted. The mode matching was optimized by the lens positions. The reflection during the lock
is ~0.01 compared to the full reflection on non-resonance, meaning the mode matching is ~99%. The error signal was maximized (i.e. demod pahse was adjusted)
by sweeping the modulation frequency. Note that the EOM is broad band. The modulation freq chosen today was 34.6MHz. |
|
Thu Jan 19 20:57:53 2017, Koji, Supply, General, Purchase
|
Ordered:
Office Depot
v AA battery Qty. 24 |
|
Thu Feb 16 17:23:12 2017, Koji, Supply, General, Purchase
|
BNC Patch Panel
8x Amphenol Connex 112443 / Isolated BNC FEMALE TO FEMALE BULKHEAD ISOLATED ADAPTER - 50 ohm
http://www.newark.com/amphenol-rf/112443/bulkhead-adapter-bnc-jack-bnc/dp/99H4399
Hole
Diameter: 13mm (0.512") D width 12.10mm (0.477")
4x Amphenol RF 31-4803-75 (75Ohm)
http://www.newark.com/amphenol-rf/31-4803-75/bulkhead-adapter-bnc-jack-bnc/dp/50B8959
same |
|
Fri Jun 23 01:58:11 2017, Koji, Optics, General, OMC #002 Repair - CM1 gluing 6x
|
[Alena, Koji]
Jun 21: Alena and Koji worked on gluing of the CM1 mirror on the OMC breadboard #002. This
is an irregular procedure. Usually, the PZT mirror subassembly is prepared before the mounting prism is glued on the breadboard. In this |
|
Fri Jun 23 10:55:07 2017, Koji, Optics, General, Dust layer on black glass beam dumps?
|
I wondered why the black glass beam dumps looked not as shiny as before. It was in fact a layer of dusts (or contaminants) accumulated on the surface.
The top part of the internal surface of the black glass was touched by a piece of lens tissue with IPA. The outer surface was already cleaned. IPA
did not work well i.e. Required multiple times of wiping. I tried FirstContact on one of the outer surface and it efficiently worked. So I think the internal |
|
Sat Jul 1 15:29:57 2017, Koji, Optics, General, Black glass cleaning / Final bonding for the emergency repair for OMC #002
|
[Alena, Koji]
Report of the work on June 30.
1. Cleaning of the black glass beam dumps |
|
Sat Jul 1 21:33:18 2017, Koji, General, General, Some purchase notes
|
- Forgot to close the cylinder valve...
v HEPA prefilter (20"x20"x1" MERV 7)
- Replace the filter for the air conditioning |
|
Wed Jul 5 16:59:44 2017, Koji, General, General, The OMC #002 was packed
|
[Stephen Koji]
The OMC #002 was packed for the transportation to Downs.
===> And transported to Downs 227 on Jul 6th. |
|
Fri Sep 8 15:14:05 2017, Koji, Facility, General, Preparation for the plumbing work 7x
|
[Steve, Aaron, Koji]
We've finished the preparation for the forthcoming plumbing work on (nominally) Sept 16th Saturday.
We've covered most of the west side of the OMC lab with plastic sheets and wraps. |
|
Mon Nov 27 20:24:24 2017, Koji, General, General, A former LHO PD (Trans) removed from the OMC #002 for the shipment to Stockholm 6x
|
Attachment 1: The PD was removed from the transmission side of the OMC #002 (former LHO OMC - the one blasted by the optical pulse in
Aug 2016).
It was confirmed that the PD has the scribing mark saying "A". |
|
Thu Nov 30 12:18:41 2017, Stephen, General, General, Preparation for Modal Testing on 4 December
|
Norna Robertson, Stephen Appert || 29 Nov 2017, 2 pm to 4 pm || 227 Downs, CIT
We made some preparations for modal testing, but did not have enough time to make measurements. Below is an after-the-fact log, including some
observations and photos of the current state of the OMC bench. |
|
Sat May 5 22:51:04 2018, Koji, Optics, General, 3IFO EOM Optical test
|
| The 3IFO EOM test performed at the 40m. Result: 40m ELOG 13819 |
|
Tue May 15 19:53:45 2018, Koji, Optics, General, EOM Q comparison
|
Qs' were estimated with a lorentzian function (eye fit)
Current LHO EOM (final version, modulation depth measurement 2018/4/5) |
|
Mon Jul 2 15:27:31 2018, Rich Abbott, Electronics, General, Work on EOM (3rd IFO unit)
|
Koji, Rich
We took apart the unit removed from the 3rd IFO (Unit serial number aLIGO #3, XTAL 10252004) to see what makes it tick. Koji has done a
fine job of adding the plots of the impedance data to this log book. Attached are some details of the physical construction showing the capacitor |
|
Wed Aug 29 11:06:30 2018, Koji, General, General, RF AM RIN and dBc conversion
|
0. If you have an RF signal whose waveform is , the amplitude is constant and 1.
1. If the waveform |
|
Sun Sep 23 19:42:21 2018, Koji, Optics, General, Montecarlo simulation of the phase difference between P and S pols for a modeled HR mirror
|
[Koji Gautam]
With Gautam's help, I ran a coating design code for an HR mirror with the standard quarter-wave design. The design used
here has 17 pairs of lambda/4 layers of SiO2 and Ta2O5 (=34 layers) with the fused silica as the substrate to realize |
|
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.
Here's |
|
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: |
|
Fri Feb 1 12:52:12 2019, Koji, Mechanics, General, PZT deformation simulation
|
A simple COMSOL simulation was run to see how the PZT deforms as the voltage applied.
Use the geometry of the ring PZT which is used in the OMCs - NAC2124 (OD 15mm, ID 9mm, H 2mm)
The material is PZT-5H (https://bostonpiezooptics.com/ceramic-materials-pzt) which |
|
Thu Apr 4 20:07:39 2019, Koji, Supply, General, Purchase
|
== Office Depot ==
Really Useful Box 9L x 6 (delivered)
Really Useful Box 17L x 5 (ordered 4/4) |
|
Fri Apr 5 23:30:20 2019, Koji, General, General, OMC (002) repair completed
|
OMC(002) repair completed
When the cable harness of OMC(004) is going to be assembled, the cable harness of OMC(002) will be replaced with the PEEK one. Otherwise, the
work has been done. |
|
Wed Apr 10 19:22:24 2019, Koji, General, General, OMC(004): preparation for the PZT subassembly bonding
|
Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060 (aLIGO OMC optical
testing procedure)
- Gluing fixture (Qty 4) |
|
Thu Apr 11 10:54:38 2019, Stephen, General, General, OMC(004): preparation for the PZT subassembly bonding
|
Quote:
Preparation for the PZT subassembly bonding (Section 6.2 and 7.3 of T1500060
(aLIGO OMC optical testing procedure) |
|
Thu Apr 11 21:22:26 2019, Koji, Mechanics, General, OMC(004): PZT sub-assembly gluing
|
[Koji Stephen]
The four PZT sub-assemblies were glued in the gluing fixtures. There were two original gluing fixtures and two additional modified fixtures for
the in-situ bonding at the repair of OMC(002). |
|
Thu Apr 11 21:22:58 2019, Koji, General, General, OMC(004): PZT sub-assembly air baking
|
[Stephen Koji]
The baking of the PZT subassemblies was more complicated than we initially thought.
The four PZT subassemblies were placed in the air bake oven A. We meant to bake the assemblies with the ramp time of 2.5h, a plateau of 2h at |
|
Sun Apr 14 23:58:49 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection
|
[Koji Stephen]
(Friday afternoon) We retrieved the PZT sub-assemblies to the clean room.
We started removing the ASSYs from the fixtures. We noticed that some part of the glass and PZT are ripped off from the ASSY and stuck with the |
|
Mon Apr 15 00:08:32 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #7) 6x
|
Sub-ASSY #7
Probably the best glued unit among the four.
Attachment #1: Mounting Block SN001 |
|
Mon Apr 15 00:39:04 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #8) 8x
|
Sub-ASSY #8
Probably the best glued unit among the four.
Attachment #1: Mounting Block SN007 |
|
Mon Apr 15 01:07:30 2019, Koji, General, General, OMC(004): PZT sub-assembly post air-bake inspection (Sub-assy #9) 7x
|
Sub-ASSY #9
The most fractured unit among four.
Attachment #1: Mounting Block SN017 |