| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
626
|
Mon Nov 27 21:05:51 2023 |
Koji | General | General | Inventory: C30655 PDs | The Cage H&I, as well as OMC DCPD bag,
were brought to the 40m for the 40m BHD.
|
|
|
625
|
Mon Nov 13 23:57:55 2023 |
Koji | Electronics | Loan / Lending | Agilent 4395A Network Analyzer -> WB251 | Aidan and Hanna wanted to use the Agilent
4395A Network Analyzer at the WB251.
All the connections were removed. |
|
|
624
|
Mon Sep 18 15:09:55 2023 |
Thejas | Optics | CAvity Bonding | Piezo inertial micromaters | New piezo actuated micrometers from thorlabs
arrived last week.
4 x MPIA10 |
|
|
623
|
Mon Sep 18 15:08:26 2023 |
Thejas | Optics | General | OMC HEPA enclosure filter fan speed | I went in lab today and turned the HEPA
filter (clsoe to the entrance) to high since
we are not doing any measurements at the |
|
|
622
|
Thu Sep 14 14:26:51 2023 |
Camille Makarem | Electronics | Characterization | Remaining PZT tests | PZTs 31, 32, 35, 40 and 45 have had their
DC responses measured (pre-reliability test)
and have been through the reliability test |
|
|
621
|
Wed Aug 30 12:38:52 2023 |
Thejas | Optics | General | A+ OMC #1: HOM spectrum | Examination into bonding template confimred
the limitation of space available to
change cavity length by at least 10 mm to |
|
|
620
|
Tue Aug 29 16:54:46 2023 |
Koji | Facility | General | LED Strip installed | [JC, Koji]
We've installed the LED strips
on the HEPA frame. We tried not to touch |
|
|
619
|
Fri Aug 25 22:01:29 2023 |
Koji | Facility | General | LED Strip installation plan | Here are the dimensions of the LED strips
and their gaps. |
|
|
618
|
Thu Aug 24 16:09:46 2023 |
Camille Makarem | Optics | General | PZT length-to-angle coupling | [Camille, Thejas]
We checked the length-to-angle coupling |
|
|
617
|
Thu Aug 24 12:30:58 2023 |
Camille Makarem, Thejas | Optics | Characterization | FSR and TMS analysis | Attached are the analysis results from
the measurements in 616.
FSR: 264.657354 +/- 0.003444 MHz |
|
|
616
|
Wed Aug 23 07:48:14 2023 |
Camille Makarem, Tejas | Optics | Characterization | FSR and TMS measuarement of A+ build | [Camille, Thejas]
22 August 2023
|
|
|
615
|
Tue Aug 22 15:51:15 2023 |
Koji | General | General | Inventory: C30655 PDs | During the OMC(004) assembly, the stock
situation for Excelitas C30655 PDs was checked.
PD Cage H |
|
|
614
|
Tue Aug 22 10:25:10 2023 |
Thejas | Optics | Characterization | cavity realignment and new power measurements | Thanks Koji, we did observe this discrepency
and thought that the code normalizes the
power/voltage readings to the reference power |
|
|
613
|
Mon Aug 21 16:15:09 2023 |
Koji | Optics | Characterization | cavity realignment and new power measurements | You should proceed to the next steps. You'll
need to repeat the power measurements before
the bonding. Next time, the measurement procedure |
|
|
612
|
Mon Aug 21 16:05:07 2023 |
Camille Makarem | Optics | Characterization | cavity realignment and new power measurements | Thanks for clarifying that. We will repeat
some power measurements and check the output
offset voltage to the laser. |
|
|
611
|
Mon Aug 21 15:02:32 2023 |
Koji | Optics | General | cavity realignment and new power measurements | This is WOW!
Excellent mode matching work.
The measurement is still |
|
|
610
|
Mon Aug 21 07:59:40 2023 |
Camille Makarem | Optics | General | cavity realignment and new power measurements | [Camille, Thejas]
18 August 2023
|
6x |
|
609
|
Thu Aug 17 09:06:51 2023 |
Camille Makarem | Optics | General | realignment of beam path through mode-matching lenses | [Camille, Thejas]
16 August 2023
|
|
|
608
|
Thu Aug 17 07:57:12 2023 |
Camille Makarem | Optics | General | mode-matching in the cavity | [Camille, Thejas, Koji]
16 August 2023
|
|
|
607
|
Tue Aug 15 16:15:13 2023 |
Camille Makarem | Optics | General | new power measurements (after cleaning) | [Camille, Thejas, Masayuki]
This afternoon we finished the realignment |
|
|
606
|
Mon Aug 14 14:13:34 2023 |
Camille Makarem | Optics | General | mode-mismatch in the cavity | For Set 1 of the data in https://nodus.ligo.caltech.edu:8081/OMC_Lab/604,
VREFL(unlocked) = 3.226V
VREFL(locked) = 0.13V |
|
|
605
|
Mon Aug 14 07:52:11 2023 |
Camille Makarem | Optics | General | 2nd cleaning of the cavity optics | [Camille, Thejas]
11 August 2023
|
|
|
604
|
Fri Aug 11 10:42:05 2023 |
Camille Makarem | Optics | Characterization | power budget measurements | [Camille, Thejas]
10 August 2023
|
|
|
603
|
Thu Aug 10 12:33:42 2023 |
Camille Makarem | Optics | General | optimizing the cavity post-cleaning | [Camille, Thejas]
This morning, we continued the efforts |
|
|
602
|
Wed Aug 9 17:00:52 2023 |
Camille Makarem | Optics | General | cleaning the cavity optics | [Camille, Thejas]
We inspected surfaces of the cavity |
|
|
601
|
Wed Aug 9 07:47:21 2023 |
Camille, Thejas | Optics | General | steering the beam spot on the curved mirrors | [Camille, Thejas, Masayuki]
8 August 2023
|
7x |
|
600
|
Tue Aug 8 10:42:11 2023 |
Thejas | Optics | General | steering the beam spot on the curved mirrors | The spots look quite bright on the CMs,
we need to move the spots towards the center
of the mirorrs to avoid scatter points. |
|
|
599
|
Tue Aug 8 09:38:14 2023 |
Koji | Optics | General | REFL CCD image | It has a higher-order mode, but you can
still extract TEM00 from this beam.
e.g., See a past reflection image |
|
|
598
|
Tue Aug 8 07:39:17 2023 |
Camille Makarem | Optics | General | steering the beam spot on the curved mirrors | [Camille, Thejas]
7 August 2023
|
|
|
597
|
Tue Aug 8 07:30:49 2023 |
Camille Makarem | Optics | General | REFL CCD image | [Camille, Thejas]
7 August 2023
|
|
|
596
|
Mon Aug 7 16:01:05 2023 |
Koji | General | General | OMC (004): Production completed | OMC (004) Production completed. The OMC
together with the transport fixture is still
placed at the 40m clean room. |
|
|
595
|
Mon Aug 7 16:00:30 2023 |
Koji | General | General | OMC (004): Cable installation | The writing of this elog is still on going
[Dean, Stephen, Koji]
4th |
|
|
594
|
Mon Aug 7 08:51:56 2023 |
Camille Makarem | Optics | General | optimizing reflected signal | We will plan to look at the reflection
CCD image this afternoon.
|
|
|
593
|
Mon Aug 7 08:37:59 2023 |
Koji | Optics | General | optimizing reflected signal | With the current level of the mode
matching, the spot positions can be optimized.
I'd work on it first as the mirror RoC |
|
|
592
|
Mon Aug 7 07:40:33 2023 |
Camille Makarem | Optics | General | optimizing reflected signal | [Camille, Thejas] 4 August 2023
-REFL PD signal (unlocked): 3.5V |
|
|
591
|
Mon Aug 7 07:36:09 2023 |
Camille Makarem | General | General | particle count | [Camille, Thejas]
We lowered the setting to MEDIUM on |
|
|
590
|
Thu Aug 3 15:24:28 2023 |
Koji | Optics | General | A+OMC mode-matching efficiency | The amount of the reflected beam is a function
of the mode matching and the cavity loss.
|
|
|
589
|
Thu Aug 3 15:15:29 2023 |
Thejas | Optics | General | A+OMC mode-matching efficiency | The cavity falls out
of lock very often when subjected to slight
movements of objects on the optic table. |
|
|
588
|
Thu Aug 3 15:04:26 2023 |
Stephen | General | General | aLIGO Unit 4 Build, Cable Routing, Preparation | [Dean, Stephen]
Unit #4 aLIGO OMC unit
was transported to the 40m Bake Lab. |
|
|
587
|
Thu Aug 3 10:31:55 2023 |
Thejas | Optics | General | A+ OMC build: beam spot positions |
|
|
|
586
|
Thu Aug 3 09:42:36 2023 |
Thejas | Optics | General | OMC Lab HEPA air filter noise | Koji mentioned that previously sarisfactory
particle count was not acheived with the
Med/Med HEPA filter setting once the enclosure |
|
|
585
|
Thu Aug 3 07:22:19 2023 |
Camille Makarem | General | General | particle count and cavity optimization/alignment | Yesterday, we measured the particle count
in the enclosure to ensure that the lower
setting on one of the HEPAs is still acceptable. |
|
|
584
|
Wed Aug 2 07:32:28 2023 |
Camille Makarem, Thejas | Optics | General | Setting up electronics and locking the cavity | [Camille, Thejas, Masayuki, Koji]
Previously, we were using the function
generator to drive the laser without using |
|
|
583
|
Tue Aug 1 11:04:13 2023 |
Camille Makarem | General | General | reoptimizing cavity alignment before locking | [Camille, Thejas]
We rechecked the alignment this morning
and re-optimized the resonance a bit. There |
|
|
582
|
Mon Jul 31 13:19:14 2023 |
Camille Makarem | General | General | plans for this week 31 July 2023 | Plans for this week:
1) Verify electronics setup for cavity
locking. |
|
|
581
|
Sat Jul 29 12:05:52 2023 |
Thejas | Optics | General | A+ OMC unit 1 build: Resonance achieved | [Camille, Thejas]
Steps followed to acheive this
resonance: |
|
|
580
|
Wed Jul 26 15:01:26 2023 |
Madeline Lesovsky | Optics | General | Subassembly Bonding Effort - Oven Bake Profile Results | The bonding efforts were conducted on Thursday,
July 13, 2023 (https://nodus.ligo.caltech.edu:8081/OMC_Lab/561)
The duration of the air bake in |
|
|
579
|
Wed Jul 26 12:14:53 2023 |
Camille Makarem | Optics | Configuration | Swapping Subassemblies | While using mirror SN14 and mirror SN30
for CM1 and CM2 respectively, we monitored
the two beam spots on FM2 and continued to |
|
|
578
|
Tue Jul 25 23:39:07 2023 |
Thejas | Optics | General | A+ OMC unit 1: CM positions swapped | With CM #30 at CM1 position and CM #14
at CM2 postion, when the beam spot on the
CM1 is a little lower than the central line |
|
|
577
|
Tue Jul 25 11:03:13 2023 |
Thejas | Optics | General | A+ OMC Unit 1 Cavity Build | This readjustment to the input beam involved
adjusting the persicope mirorrs and sterring
mirror. We estimate that this will have changed |
|