| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1663
|
Tue Jun 9 23:25:24 2009 |
rob | Update | Locking | ? |
|
|
|
11685
|
Tue Oct 13 05:48:39 2015 |
ericq | Update | LSC | :/ | [ericq, Gautam]
Despite our best efforts, the grappa
remains out of reach: the DRFPMI was not |
|
|
4237
|
Wed Feb 2 03:27:20 2011 |
Koji | Summary | Green Locking | 85MHz Freq divider | The freq divider was built and installed
in the beat detection path.
Attachment 1: Circuit diagram |
|
|
3803
|
Thu Oct 28 03:07:53 2010 |
kiwamu | Update | Green Locking | 80MHz VCO for green PLL : a health check | I
did a health check for a 80MHz VCO box. |
|
|
3820
|
Fri Oct 29 06:20:20 2010 |
kiwamu | Update | Green Locking | 80MHz VCO for green PLL : VCO calibration | I calibrated the VCO frequency
as a function of the applied input voltage.
|
|
|
3898
|
Thu Nov 11 17:47:36 2010 |
kiwamu | Update | Green Locking | 80MHz VCO : improve PLL hold-in range and put a boost | In order
to enlarge the hold-in range I modified the |
|
|
3896
|
Thu Nov 11 13:54:05 2010 |
kiwamu | Update | Green Locking | 80MHz VCO : about PLL hold-in range |
The hold-in |
|
|
3879
|
Mon Nov 8 10:48:58 2010 |
kiwamu | Update | Green Locking | 80MHz VCO : PLL open loop looks good | |
|
|
3881
|
Mon Nov 8 16:03:46 2010 |
kiwamu | Update | Green Locking | 80MHz VCO : PLL open loop looks good |
|
|
|
3397
|
Wed Aug 11 11:51:45 2010 |
Gopal | Update | WIKI-40M Update | 8.5.10 - 8.11.10 Weekly Update | Summary of
this Week's Activities: |
|
|
12511
|
Wed Sep 21 09:04:57 2016 |
Steve | Update | General | 8 hours recovery progress | Good 8 hours
|
|
|
5619
|
Tue Oct 4 20:34:20 2011 |
Katrin | Update | Green Locking | 7kHz Peak in servo input YARM | [Kiwamu, Katrin]
As reported earlier an oscillation
around 7kHz is an the PDH error signal. The |
|
|
7077
|
Thu Aug 2 04:58:00 2012 |
Masha | Update | PEM | 70 Meter Long Guralp 1 Cable | The parts Jenne and I ordered arrived today,
so we made a |
|
|
3219
|
Wed Jul 14 13:03:04 2010 |
Gopal | Update | WIKI-40M Update | 7.8.10 - 7.14.10 Weekly Update | Summary of this Week's Activities:
Wed. 7/7: COMSOL Busbar tutorials;
began stack design; began base; Viton rubber |
|
|
3363
|
Wed Aug 4 20:58:22 2010 |
Gopal | Update | WIKI-40M Update | 7.28.10 - 8.4.10 Weekly Update | Summary
of this week's activities: |
|
|
3307
|
Wed Jul 28 12:31:00 2010 |
Gopal | Update | WIKI-40M Update | 7.21.10-7.28.10 Weekly Update | Summary of this week's activities:
7/21: Frequency Domain Analysis of
rectangular bar; discussed with Koji how |
|
|
3255
|
Wed Jul 21 11:57:59 2010 |
Gopal | Update | WIKI-40M Update | 7.14.10-7.21.10 Weekly Update | Summary of this week's activities:
7/14: Analytical calculation of Viton
spring constant; updated Viton values in |
|
|
5657
|
Wed Oct 12 18:54:02 2011 |
Katrin | Update | Green Locking | 60 Hz oscillation due to broken BNC cable | There was a 60 Hz and 120 Hz oscillation
on the green PDH photo diode output. After
a long search, I could identify that |
|
|
17460
|
Thu Feb 9 17:33:34 2023 |
yuta | Summary | BHD | 60 Hz noise investigations around IMC, part 6, TTFSS | [Anchal, Yuta]
Measurements yesterday (40m/17458) |
|
|
17458
|
Thu Feb 9 10:19:22 2023 |
yuta | Summary | BHD | 60 Hz noise investigations around IMC, part 4, using ALS BEAT | [Anchal, Yuta]
Yesterday, we have measured the frequency |
|
|
17455
|
Tue Feb 7 20:10:05 2023 |
yuta | Summary | BHD | 60 Hz noise investigations around IMC, part 3 | [Anchal, Yuta]
We have measured OLTF of IMC loop, |
|
|
17446
|
Fri Feb 3 17:39:38 2023 |
yuta | Summary | BHD | 60 Hz noise investigations around IMC, part 2 | [Paco, Yuta]
We estimated the frequency noise of |
|
|
17450
|
Sun Feb 5 18:02:46 2023 |
rana | Summary | BHD | 60 Hz noise investigations around IMC, part 2 | For the loop calculation, don't you
have to consider the IMC cavity pole? What
about the analog filter on the output of |
|
|
17431
|
Fri Jan 27 19:35:31 2023 |
yuta | Summary | BHD | 60 Hz noise investigations around IMC | So far different measurements are consistent
with the hypothesis that the 60 Hz noise
is from PSL frequency noise (40m/17423). |
6x |
|
6127
|
Sat Dec 17 00:00:03 2011 |
kiwamu | Update | Green Locking | 60 Hz line nose gone |
|
|
|
17413
|
Mon Jan 23 22:51:17 2023 |
yuta | Summary | BHD | 60 Hz harmonics side lobe investigations | [Paco, Yehonathan, Yuta]
Since we have installed BH44, we
are seeing side lobes of 60 Hz + harmonics |
|
|
17461
|
Mon Feb 13 11:54:54 2023 |
yuta | Summary | BHD | 60 Hz frequency noise is coming from MC1 coils | [JC, Yuta]
We have found that MC1 coils are causing |
|
|
17462
|
Mon Feb 13 17:35:20 2023 |
Anchal | Summary | BHD | 60 Hz frequency noise is coming from MC1 coils | [Anchal, Yuta]
We think we have narrowed
down the source of 60 Hz noise to one fo |
|
|
3752
|
Thu Oct 21 12:15:02 2010 |
rana | Update | PEM | 6.9 Mag EQ in Gulf of California |
Magnitude
|
|
|
3166
|
Wed Jul 7 11:35:59 2010 |
Gopal | Update | WIKI-40M Update | 6.30.10 - 7.7.10 Weekly Update | Summary of this Week's Activities:
6/30: 2nd and 3rd drafts of Progress
Report |
|
|
3142
|
Wed Jun 30 11:35:06 2010 |
Gopal | Update | General | 6.23.10 - 6.30.10 Weekly Update | Summary of this Week's Activities:
6/23: LIGO Safety Tour; Simulink
Controls Tutorial |
|
|
3103
|
Wed Jun 23 12:31:36 2010 |
Gopal | Update | General | 6.16.10-6.23.10 Weekly Update | Summary of This Week's Activities:
6/16: LIGO Orientation; First Weekly
Meeting; 40m tour with Jenne; Removed WFS |
|
|
11139
|
Fri Mar 13 03:10:35 2015 |
Jenne | Update | LSC | 6+ CARM->REFL transitions, 1 DARM->AS transition | Much more success tonight.
I only started my tally after I got the CARM |
|
|
11140
|
Fri Mar 13 14:11:59 2015 |
rana | Update | LSC | 6+ CARM->REFL transitions, 1 DARM->AS transition | Since the DARM_OUT signal is only 500 counts_peak,
I don't see why AS55 whitening needs
to be switched on. |
|
|
12392
|
Wed Aug 10 15:34:24 2016 |
Steve | Update | SUS | 6 in-lbs torque driver for wire clamp screw | The 7.5 in-lb of Wiha seems at the upper
end of torque range for a 4-40 SS screw
Wiha 28502 ordered with range 5 |
|
|
11596
|
Mon Sep 14 23:12:49 2015 |
ericq | Update | LSC | 55MHz modulation phase effect on PRMI | With the adjustable delay line box installed
in the 55MHz modulation path, I've
measured the PRMI sensing matrix as a function |
|
|
11173
|
Wed Mar 25 18:48:11 2015 |
Koji | Summary | LSC | 55MHz demodulators inspection | [Koji Den EricG]
We inspected the {REFL, AS, POP}55
demodulators. |
|
|
8057
|
Mon Feb 11 16:16:27 2013 |
Steve | Update | VAC | 55 days at atmoshere | CP
Stat 100 sheet-covers were replaced
by clean ones on open chambers BS, ITMX, |
|
|
11490
|
Tue Aug 11 02:40:29 2015 |
ericq | Update | LSC | 50m delay lines - Rough calibrations | Jessica will soon ELOG about some measurements
suggesting that the conductive connector-ized
ALS delay line enclosure is the way to go, |
|
|
574
|
Thu Jun 26 14:06:00 2008 |
Masha | Update | General | 500mW INNOLIGHT NPRO info | Below is the placement of 500mW INNOLIGHT
NPRO mephisto laser. It is set up on the
Symmetric Port table. [IMG]elog:574/1[/IMG] |
|
|
8557
|
Thu May 9 02:19:53 2013 |
Jenne | Update | Locking | 50% BS installed in POP path | Koji had the good idea of trying to measure
the motion of the POP beam, and feeding that
signal to PRM yaw to stabilize the motion. |
|
|
754
|
Tue Jul 29 11:50:01 2008 |
Jenne | Update | Environment | 5.6 Earthquake | Earthquake Details
Magnitude 5.6
Date-Time
|
|
|
1653
|
Thu Jun 4 23:39:23 2009 |
pete | Update | PEM | 5 days, 20 days of accelerometers | Looks like yesterday was particularly noisy.
It's unclear to me why diurnal variation
much more visible in MC1_Y, and why the floor |
|
|
6092
|
Thu Dec 8 22:44:55 2011 |
Koji | Update | RF System | 4ch demod test result | 1) Linearity Test
LO input level was +10dBm. The LO
freq was 11MHz and 55MHz for CH1 and CH2 |
|
|
6086
|
Thu Dec 8 00:45:13 2011 |
Koji | Update | RF System | 4ch demod is ready | I have tested the left 2ch of 4ch demod
board.
The left most is for 11MHz, and the |
|
|
1414
|
Fri Mar 20 15:54:29 2009 |
steve | Omnistructure | General | 480V crane power switch on MEZ | CES Mezzanine is beeing rebuilt to accommodate
our new neighbor: the 20ft high water slide...&
.jacuzzi |
|
|
2612
|
Thu Feb 18 10:10:43 2010 |
steve | Configuration | General | 480 V AC power turned off | Only the 40m cranes are running on 480VAC
The electricians are rewiring this transformer
on the mezzanine so it was shut down. |
|
|
2966
|
Fri May 21 11:56:34 2010 |
Alberto | Update | 40m Upgrading | 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. | I update my old 40mUpgrade Optickle model,
by adding the latest updates in the optical
layout (mirror distances, main optics transmissivities, |
7x |
|
2968
|
Fri May 21 16:24:11 2010 |
Koji | Update | LSC | 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. | 1. Give us the designed arm length. What
is the criteria?
2. The arm lengths got shorter as |
|
|
2973
|
Mon May 24 10:03:14 2010 |
rana | Update | LSC | 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. |
If you have a working 40m Optickle
model, put it in a common place in the SVN, |
|