| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1577
|
Tue May 12 15:22:09 2009 |
Yoichi | Update | LSC | Arm Finesse | [quote]
It looks as if the measured DARM response
is skewed by an extra low pass filter at |
|
|
11430
|
Mon Jul 20 11:57:17 2015 |
ericq | Update | General | Arm Locking recovered | The interferometer is warming up!
I had some issues locking the IMC
at first. It turned out that the MC3 side |
|
|
1456
|
Mon Apr 6 21:50:43 2009 |
rana | Update | LSC | Arm Locking via pushing MC2 | Inspired by our 'No Refcav' scheme here, I
was inspired to re-explore the idea of locking
the
|
|
|
2247
|
Thu Nov 12 02:02:18 2009 |
rana | Summary | LSC | Arm Locking with no feedback to the ETM or ITM | Steps:
1) Turn off feedback to ETMY (the
ETMY button on the LSC screen). |
|
|
10414
|
Wed Aug 20 15:31:27 2014 |
ericq | Update | COC | Arm Loss Investigations Continue | [ericq, Gabriele]
Summary: After today's meeting, Gabriele
and I looked into the arm loss situation, |
|
|
5626
|
Thu Oct 6 15:40:57 2011 |
Jenne | Update | LSC | Arm absl length data taken | [Katrin, Jenne]
We took the data for the new absolute
length measurement of both arms, after the |
|
|
5653
|
Tue Oct 11 21:23:51 2011 |
Jenne | Update | LSC | Arm absl lengths |
|
|
|
728
|
Wed Jul 23 22:34:07 2008 |
Yoichi | Update | LSC | Arm cavity g-factor measurement | I tried the same thing as the X-arm to the
Y-arm.
I'm puzzled. I found exactly the same behavior |
|
|
730
|
Thu Jul 24 01:27:00 2008 |
Koji | Update | LSC | Arm cavity g-factor measurement | [quote]I locked the Y-arm and mis-aligned
the end mirror in Yaw until the transmission
power gets half.
|
|
|
731
|
Thu Jul 24 02:57:26 2008 |
rob | Update | LSC | Arm cavity g-factor measurement | [quote]
So, now I feel that the method for the TEM01
quest should be reconsidered.
|
|
|
733
|
Thu Jul 24 08:09:26 2008 |
Yoichi | Update | LSC | Arm cavity g-factor measurement | [quote]
A-ha! Do you always expect the 30Hz signal,
don't you?
|
|
|
2996
|
Wed May 26 22:22:03 2010 |
Alberto | Configuration | 40m Upgrading | Arm cavity length | The second sideband is resonant in the
arms for a cavity length of 37.9299m.
The nearest antiresonant arm lengths |
|
|
2070
|
Thu Oct 8 20:18:56 2009 |
Koji | Summary | General | Arm cavity loss | Last night (Oct 07), I ran armLoss script
in order to obtain the latest numbers for
the arm cavity loss. |
|
|
2416
|
Mon Dec 14 22:32:56 2009 |
Koji | Update | General | Arm cavity loss ~ result | I like to ask someone to review the calculation
on the wiki. |
|
|
8844
|
Sun Jul 14 18:19:00 2013 |
Annalisa | Update | Green Locking | Arm cavity scan | Yesterday evening Nic and me were in the
lab. The Mode Cleaner was unlocked, but after
many attempt we could fix it and we did many |
|
|
15860
|
Wed Mar 3 23:23:58 2021 |
gautam | Update | ALS | Arm cavity scan | I see no evidence of anything radically
different from my PSL table optical
characterization in the IMC transmitted |
|
|
14944
|
Sun Oct 6 15:23:27 2019 |
gautam | Update | ALS | Arm control using error signals achieved | Summary:
I |
|
|
5079
|
Mon Aug 1 04:08:24 2011 |
kiwamu | Update | ABSL | Arm length measurement : cavity kick technique | I made some
attempts to measure the current length of |
|
|
5095
|
Tue Aug 2 16:55:21 2011 |
rana | Update | ABSL | Arm length measurement : cavity kick technique |
|
|
|
11098
|
Wed Mar 4 19:03:19 2015 |
ericq | Update | LSC | Arm length remeasurement | As discussed at today's meeting, we
would like to (re)measure the Arm cavity
lengths to ~mm precision, and their g-factors. |
|
|
11107
|
Fri Mar 6 02:10:35 2015 |
rana | Update | LSC | Arm length remeasurement | This has been done before:
http://nodus.ligo.caltech.edu:8080/40m/6938
Arm length measurements and g-factor |
|
|
3001
|
Thu May 27 12:52:02 2010 |
Alberto | Update | 40m Upgrading | Arm lengths |
For both sidebands to be antiresonant
in the arms, the first modulation frequency |
|
|
11524
|
Sat Aug 22 15:48:32 2015 |
Koji | Summary | LSC | Arm locking recovery | As per Ignacio's request, I restored
the arm locking.
- MC WFS relief |
|
|
1576
|
Tue May 12 01:22:51 2009 |
Yoichi | Update | LSC | Arm loss | Using the armLoss script (/cvs/cds/caltech/scripts/LSC/armLoss),
I measured the round trip loss (RTL) of the
arms.
|
|
|
12533
|
Wed Oct 5 19:10:04 2016 |
gautam | Update | General | Arm loss measurement review | [ericq,gautam]
There are multiple methods by which
the arm loss can be measured, including, |
|
|
10248
|
Mon Jul 21 17:32:43 2014 |
ericq | Summary | LSC | Arm losses |
|
|
|
15264
|
Tue Mar 10 19:59:09 2020 |
Yehonathan | Update | Loss Measurement | Arm transfer function measurement | I want to measure the transfer function
of the arm cavities to extract the pole frequencies
and get more insight into what is going |
|
|
15269
|
Thu Mar 12 10:43:50 2020 |
rana | Update | Loss Measurement | Arm transfer function measurement |
|
|
|
15277
|
Mon Mar 16 15:23:03 2020 |
Yehonathan | Update | Loss Measurement | Arm transfer function measurement | I measured the cross-calibration of the
two PDs on the PSL table.
I used the existing flip mounted |
|
|
15307
|
Sat Apr 18 14:57:44 2020 |
Yehonathan | Update | Loss Measurement | Arm transfer function measurement | Ok, now I understand my foolishness. It
should definitely be 1/sqrt(f^2+fp^2)
. |
|
|
15355
|
Tue May 26 14:32:44 2020 |
gautam | Update | LSC | Arm transmission RIN | Summary:
The measured RIN of the arm cavity
transmission when the PRFPMI is locked is |
|
|
15359
|
Wed May 27 19:36:33 2020 |
Koji | Update | LSC | Arm transmission RIN | My speculation for the worse RIN is:
- Unoptimized alignment -> Larger
linear coupling of the RIN with the misalignment |
|
|
15361
|
Thu May 28 18:36:45 2020 |
gautam | Update | LSC | Arm transmission RIN | I agree, I think the PRC excess angular
motion, PIT
in particular, is a dominant |
|
|
15362
|
Fri May 29 00:34:57 2020 |
rana | Update | LSC | Arm transmission RIN | how bout corner plot with power signals
and oplevs? I think that would show not just
linear couplings (like your coherence), but |
|
|
2611
|
Wed Feb 17 19:36:05 2010 |
Koji | Update | COC | Arm visibility | I
have measured the arm visibilities.
I did not see any change since the |
|
|
15225
|
Wed Feb 26 17:17:17 2020 |
Yehonathan | Update | | Arms DC loss measurements | {Yehonathan, Gautam}
In order to measure the loss in
the arm cavities in reflection, we use the |
6x |
|
10558
|
Wed Oct 1 19:40:46 2014 |
ericq | Update | LSC | Arms IR aligned | Summary:
Beamsplitter
was put into MC refl path.
HWP
was rotated to maximize power into PMC.
|
|
|
2605
|
Tue Feb 16 10:01:16 2010 |
Alberto | Configuration | LSC | Arms and PRC not locking | Since last Friday either the arms or the
PRC can't lock.
The montors show the beam flashing |
|
|
2607
|
Tue Feb 16 14:10:06 2010 |
josephb, rob, koji | Configuration | LSC | Arms and PRC not locking |
|
|
|
2608
|
Tue Feb 16 15:25:00 2010 |
Alberto | Configuration | LSC | Arms and PRC not locking |
|
|
|
9213
|
Mon Oct 7 13:55:26 2013 |
Jenne | Update | LSC | Arms locked in IR for many hours | Someone left the arms aligned, and the
LSC engaged, so the arms have been locked
almost continuously for several days |
|
|
8974
|
Tue Aug 6 19:53:15 2013 |
Jenne | Update | LSC | Arms locked in IR, aligned. IFO at nominal power | [Koji, Manasa, Jenne]
The Y arm was locked in IR, and we
saw flashing in the Xarm (Gautam had the |
|
|
8975
|
Wed Aug 7 10:09:30 2013 |
Koji | Update | LSC | Arms locked in IR, aligned. IFO at nominal power | I have a concern about the SRM suspension.
The yaw alignment bias produces huge pitch
coupling. |
|
|
9008
|
Tue Aug 13 21:09:03 2013 |
manasa | Update | Green Locking | Arms ready for ALS | I aligned
both the X and Y end green to the arms.
The transmitted green were aligned |
|
|
1233
|
Fri Jan 16 18:25:32 2009 |
Yoichi, Kakeru, Rana | Update | LSC | Arms were unstable | The single arm lock had been unstable for
both arms in the past few days.
|
|
|
3582
|
Fri Sep 17 03:32:11 2010 |
Koji | Update | SUS | Arrangement of the SUS towers | The day before yesterday, I was cleaning
a flow bench in the clean room.
I found that one SOS was standing |
|
|
3761
|
Fri Oct 22 15:06:43 2010 |
Jenne | Update | SUS | Arts and Crafts! | This afternoon I epoxied the guiderod and
wire standoff to the new PRM. I also
epoxied the magnets that Suresh picked out |
|
|
16725
|
Tue Mar 15 10:45:31 2022 |
Paco | Update | General | Assembled small in-vac optics | [Paco]
This morning I assembled LO3,
LO4 and AS3 (all |
|
|
3936
|
Tue Nov 16 23:36:29 2010 |
Suresh, Jenne | Update | SUS | Assembly of ETMs | [Jenne,
Suresh]
|
|
|
15111
|
Mon Jan 6 15:36:55 2020 |
Jon | Update | PSL | Assembly underway for c1psl upgrade | [Jon, Yehonathan]
We've begun assembling the
new c1psl Acromag chassis based on Yehonathan's |
|