| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
17407
|
Fri Jan 20 20:13:20 2023 |
Anchal | Update | ASC | Installed 2 flipper mirrors for handingl MC reflection beam to camera | After discussions with Yuta, I figured
that a better optical layout is possible
which does not interfere with the existing |
|
|
17408
|
Sat Jan 21 15:32:40 2023 |
Anchal | Update | ASC | AS WFS path nominally set | I've completed the beam redirection
path for AS beam to WFS heads in a nominal
way. By that I mean that all mirrors (M1, |
|
|
17409
|
Sat Jan 21 18:01:06 2023 |
Anchal | Update | ALS | DFD and Phase tracker AM coupling | I took transfer function measurement
of DFD AM coupling using noise excitation.
Noise excitation |
|
|
17410
|
Mon Jan 23 11:20:44 2023 |
JC | Summary | BHD | BH44 RFPD optical path and LO/AS camera | Here's the beam path of BH44. |
|
|
17411
|
Mon Jan 23 16:31:23 2023 |
rana | Update | ALS | DFD and Phase tracker AM coupling | Both the TF measurement and the noise measurements
are useful, but the nosie measurement is
much more meaningful. Since we expect the |
|
|
17412
|
Mon Jan 23 20:50:58 2023 |
Anchal | Update | ASC | AS WFS path beam profiled | I measured the expected beam profile by
WFS photodiodes by measuring the beam when
mode cleaner was unlocked from the point |
|
|
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 |
|
|
17414
|
Tue Jan 24 11:21:59 2023 |
yuta | Summary | BHD | FPMI displacement noise with 60 Hz harmonics side lobes | Just to show how bad 60 Hz noise is, I
compared FPMI displacement noise with pre-BH44
era (measured on Jan 13, 40m/17400). |
|
|
17415
|
Tue Jan 24 16:12:07 2023 |
rana | Summary | BHD | FPMI displacement noise with 60 Hz harmonics side lobes | 1) do a comparison with the whtiening before
the ADC on/off. This will tell us if it is
pickup before the whtiening filter or not. |
|
|
17416
|
Tue Jan 24 21:04:59 2023 |
Anchal | Update | ASC | AS WFS path beam profiled | I completed the mode matching calculation
today and found good solution with 360.6
mm ROC PLCX lens at -1.2 m from z=0 point. |
|
|
17417
|
Tue Jan 24 21:29:31 2023 |
yuta | Summary | BHD | Electronics diagram around BH44 and BH55 | 1) Turning the whitening filter before
the ADC on/off didn't changed the relative
height of 60 Hz peak compared with the |
|
|
17418
|
Wed Jan 25 10:02:47 2023 |
yehonathan | Update | | Earthquake, MC3 watchdog tripped | We came this morning and noticed the FSS_FAST
channel was moving very rapidly. Short inspection
showed that MC3 watchdog got tripped. After |
|
|
17419
|
Wed Jan 25 11:35:20 2023 |
yuta | Summary | BHD | REFL55 visually inspected, BH44 Kapton taped | Following was done to investigate 60 Hz
noise issue, but no significant change in
the FPMI noise observed. |
|
|
17420
|
Wed Jan 25 12:49:14 2023 |
Radhika | Update | ALS | XARM green laser lock debugging | |
|
|
17421
|
Wed Jan 25 14:33:07 2023 |
rana | Summary | BHD | REFL55 visually inspected, BH44 Kapton taped | Kapton tape is a good insulator, so its
a good block for 60 Hz. But it is mostly
useless for RF since the capacitance between |
|
|
17422
|
Wed Jan 25 16:58:19 2023 |
Alex | Update | Cameras | Recording CCD cameras | Thus far, the software needed for the Magewell
video encoder has been successfully installed
on Donatella. OBS studio has also been installed |
|
|
17423
|
Wed Jan 25 18:01:21 2023 |
yuta | Summary | BHD | BH44 setup isolated, but 60 Hz noise stays the same | [Paco, Anchal, Yuta]
Isolating
BH44 setup from the rest didn't help |
|
|
17424
|
Thu Jan 26 00:18:54 2023 |
Koji | Update | Cameras | Recording CCD cameras | Connect any video signal supported by the
adapter. Use Windows / Mac or any other OS.
If it keeps complaining, contact Magwell |
|
|
17425
|
Thu Jan 26 15:56:30 2023 |
Anchal | Update | ASC | 1X1 -5V sorenson tripped | [Yuta, Anchal]
|
|
|
17426
|
Thu Jan 26 16:07:05 2023 |
yuta | Summary | PSL | PMC aligned, now PMC transmission is 0.7 | PMC aligned (Attachment #1).
Over the past month, PMC transmission
is actually slowly growing from 0.68 to 0.70 |
|
|
17427
|
Thu Jan 26 18:20:43 2023 |
Anchal | Update | PEM | HEPA Monitor setup using WFS BLRMS | I implemented the BLRMS on WFS1/2_I_PIT/YAW
outputs and using there value, a HEPA state
can be defined. I've currently set it |
|
|
17428
|
Thu Jan 26 23:33:19 2023 |
Koji | Update | LSC | EP30-2 Epoxy bonding for Yuta | @OMC Lab
EP30-2 Epoxy bonding of V beam dumps
for LSC PDs. |
|
|
17429
|
Fri Jan 27 11:26:31 2023 |
rana | Update | PEM | HEPA Monitor setup using WFS BLRMS | this is very exciting! Its the beginning
of the task of reducing vast amounts of PEM
data into human-useful (bite sized) info. |
|
|
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 |
|
17432
|
Fri Jan 27 21:22:57 2023 |
yuta | Summary | BHD | V beam dump installed for BH44 RF PD | One of these V beam dumps was installed
for BH44 RF PD.
The rest is now stored in the box |
|
|
17433
|
Mon Jan 30 10:59:15 2023 |
JC | Summary | PSL | PMC aligned, now PMC transmission is 0.7 | PMC hit a drop around mid-day on Saturday
and has been going down since. As of now,
C1:PSL-PMC_PMCTRANSPD - 0.664 |
|
|
17434
|
Mon Jan 30 18:08:56 2023 |
Paco | Summary | BHD | c1cal DAQ error 0x2000 | [JC, Paco]
I tried restarting all models this
afternoon to see if the DC error 0x2000 on |
|
|
17435
|
Tue Jan 31 11:02:16 2023 |
Anchal | Summary | BHD | c1cal DAQ error 0x2000 fixed | The 0x2000 error happens when the rtcds
model can not acquire the requested number
of channels at their data rates. Basically, |
|
|
17436
|
Tue Jan 31 20:49:46 2023 |
Anchal | Update | ALS | Moku Phasemeter AM coupling and comparison | Model changes and addition of
Moku Phasemeter
Today
I setup Moku:Pro MP1 with phasemeter app |
|
|
17437
|
Wed Feb 1 09:56:00 2023 |
Radhika | Update | ALS | XARM green laser lock debugging | |
7x |
|
17438
|
Wed Feb 1 11:52:13 2023 |
Anchal | Update | ALS | Moku Phasemeter AM coupling and comparison | I wondered if Moku could have lied about
its noise measurement since the RF source
was the same Moku device. To avoid this bias, |
6x |
|
17439
|
Wed Feb 1 12:55:14 2023 |
Radhika | Update | ALS | XARM green laser lock debugging | I reconnected the green REFL monitor channel
and acquired its spectra when the laser was
(mostly) locked. During the collection window, |
|
|
17440
|
Wed Feb 1 14:43:21 2023 |
JC | Update | VAC | False Nitrogen Leakage | Chub mentioned to Paco and I that the Nitrogen
seemed to be losing pressure quicker than
usual. After looking over the previous 4 |
|
|
17441
|
Wed Feb 1 16:53:55 2023 |
Alex | Summary | General | Shadowing Anchal on developing a change for the c1ioo CDS computer | During my time shadowing Anchal, we discussed
the need for digital control systems on the
suspension systems for the 40 meter optics. |
|
|
17442
|
Thu Feb 2 13:21:39 2023 |
Radhika | Update | General | Mephisto laser interlock | Today while aligning optics at the xend,
my knee engaged the AUX laser interlock.
I spent some time trying to disable the interlock, |
|