| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16851
|
Fri May 13 14:26:00 2022 |
JC | Update | Alignment | LO2 Beam | [Yehonathan, JC]
Yehonathan and I attempted to align
the LO2 beam today through the BS chamber |
|
|
16567
|
Mon Jan 10 18:36:41 2022 |
Anchal | Summary | BHD | LO1 free swinging test set to trigger | LO1 is set to go through a free swinging
test at 1 am tonight. We have used this script
(scripts/SUS/InMatCalc/freeSwing.py) reliably |
|
|
17487
|
Wed Mar 1 19:18:18 2023 |
Paco | Update | SUS | LO1 dewhitening | [Paco, Anchal]
Today we invested some time in
the DW filters for LO1 supension. We discovered |
|
|
17488
|
Thu Mar 2 10:54:25 2023 |
Paco | Update | SUS | LO1 dewhitening | We added the DB9 short connectors to all
coil drivers in the BHD suspensions and updated
FM9-FM10 for LO1, LO2, AS1, AS4, SR2, PR2 |
|
|
16562
|
Mon Jan 10 14:52:51 2022 |
Anchal | Summary | BHD | LO1 OSEMs roughly calibrated and noise measured | I used the open light level output of 908
for ITMX side OSEM from 40m/16549
to roughly calibrate cts2um filter module |
|
|
17133
|
Tue Sep 6 17:39:40 2022 |
Paco | Update | SUS | LO1 LO2 AS1 AS4 damping loop step responses | I tuned the local damping gains for LO1,
LO2, AS1, and AS4 by looking at step responses
in the DOF basis (i.e. POS, PIT, YAW, and |
|
|
16919
|
Wed Jun 15 15:45:37 2022 |
yuta | Update | SUS | LO1 LLCOIL now working, it was loose connection | We tracked the issue of LO1 LLCOIL not
actuating LO1, and found that the DB9 cable
from the coil driver to the sat amp was loose. |
|
|
16572
|
Tue Jan 11 12:19:12 2022 |
Anchal | Summary | BHD | LO1 Input Matrix Diagonalization performed. | The frree swinging test was successful.
I ran the input matrix diagonalization code
(scripts/SUS/InMAtCalc/sus_diagonalization.py) |
|
|
17565
|
Wed Apr 26 11:27:49 2023 |
Paco | Summary | BHD | LO/MI(DARM) signal strength comparison between the configurations with finesse | I'm
checking Koji + Yuta's not-so-naive calculations
using finesse. |
|
|
17560
|
Mon Apr 24 19:11:20 2023 |
Koji | Summary | BHD | LO/MI(DARM) signal strength comparison between the configurations | Yuta and I had a discussion last week about
the signal strength between the configurations.
Here are some naive calculations. |
|
|
17167
|
Fri Sep 30 20:18:55 2022 |
Paco | Update | BHD | LO phase noise with different actuation points | [Paco, Koji]
We took lo phase noise spectra
actuating on the for different optics-- LO1, |
|
|
17511
|
Tue Mar 14 18:44:39 2023 |
yuta | Update | BHD | LO phase noise measurements in ITMX single bounce, MICH and FPMI | [Anchal, Yuta]
We have measured LO phase noise in |
|
|
17547
|
Tue Apr 18 19:29:43 2023 |
yuta | Update | BHD | LO phase noise measurements in ITMX single bounce, MICH and FPMI | [Anchal, Yuta]
We have repeated LO phase noise measurement |
|
|
17514
|
Mon Mar 20 20:27:30 2023 |
yuta | Update | BHD | LO phase noise contribution in MICH BHD | [Paco, Yuta]
MICH was locked with balanced homodyne
readout with LO phase locked using BH55_Q |
|
|
17520
|
Thu Mar 23 17:47:53 2023 |
Paco | Update | NoiseBudget | LO phase noise budget (BH55_Q) | I drafted a calibrated LO Phase noise budget
using diaggui whose template is saved under
/opt/rtcds/caltech/c1/Git/40m/measurements/BHD/LO_PHASE_cal_nb.xml |
|
|
17171
|
Mon Oct 3 15:19:05 2022 |
Paco | Update | BHD | LO phase noise and control after violin mode filters | [Anchal, Paco]
We started the day by taking a
spectrum of C1:HPC-LO_PHASE_IN1, |
|
|
17204
|
Fri Oct 21 16:15:10 2022 |
yuta | Summary | BHD | LO phase locking with BH55 audio dither trials | [Paco, Yuta]
We are still struggling with locking
LO phase in MICH or ITM single bounce with |
|
|
17212
|
Tue Oct 25 17:27:11 2022 |
Paco | Summary | BHD | LO phase control with RF + audio sidebands | [Yuta, Paco]
Today
we locked LO phase with BH55 + Audio dithering |
|
|
17216
|
Wed Oct 26 16:04:12 2022 |
Paco | Summary | BHD | LO phase control with RF + audio sidebands | [Yuta, Paco]
Today
we again locked the LO phase with BH55 + |
|
|
17343
|
Tue Dec 6 17:12:23 2022 |
yehonathan | Summary | BHD | LO phase control using audio (MICH and AS1) + RF | {Yuta, Yehonathan}
Today we lock LO phase using audio+RF
method in two variants: AS1+RF and MICH(BS)+RF. |
|
|
17491
|
Fri Mar 3 18:47:13 2023 |
Paco | Summary | BHD | LO phase POS noise coupling - I | I tried some LO PHASE noise coupling measurements
today. With MICH locked using AS55_Q, I control
the LO phase using the single RF (BH55_Q) |
|
|
17142
|
Thu Sep 15 21:12:53 2022 |
Paco | Update | BHD | LO phase "dc" control | Locked the LO phase with a MICH offset=+91.
The LO is midfringe (locked using the A-B
zero crossing), so it's far from being |
|
|
11825
|
Mon Nov 30 14:12:14 2015 |
ericq | Update | LSC | LO level check for the LSC RF distribution box | I checked the RF levels at the LSC LO distribution
box, with the agilent scope and a handful
of couplers. This was all done with the Marconi |
|
|
11826
|
Mon Nov 30 15:17:57 2015 |
Koji | Update | LSC | LO level check for the LSC RF distribution box | T1000461
tells us that the nominal LO input is 2dBm
although we don't know what's the |
|
|
11802
|
Mon Nov 23 22:12:10 2015 |
Koji | Update | IOO | LO level check for the IMC demod board | In order to check the proper LO level,
the IMC demod board was checked. As
a short summary, -8dBm is the proper input |
|
|
11807
|
Wed Nov 25 04:24:21 2015 |
rana | Update | IOO | LO level check for the IMC demod board | Hmmm. Very non-standard demod. From the
photo, looks like someone did some surgery
with the attenuators (AT1, AT2, AT3) in the |
|
|
11808
|
Wed Nov 25 10:07:10 2015 |
Koji | Update | IOO | LO level check for the IMC demod board | I didn't finish making the DCC entry
for this module yet.
But the attenuators are |
|
|
11811
|
Wed Nov 25 16:46:10 2015 |
Koji | Update | IOO | LO level check for the IMC demod board | Awwww. I found that the demod board has
the power splitter (PSCJ-2-1) with one output
unterminated. |
|
|
11812
|
Wed Nov 25 20:07:35 2015 |
rana | Update | IOO | LO level check for the IMC demod board | Perhaps we can replace T1 with a mini-circuits
hybrid 0-90 deg splitter and then remove
the trim caps. (JSPQ-80, JYPQ-30, SCPQ-50) |
|
|
6119
|
Wed Dec 14 14:30:43 2011 |
Jenne | Update | RF System | LO for new demod box | The Rich demod box wants 10dBm for the
local oscillator inputs, so I measured the
values that we have coming out of the distribution |
|
|
6121
|
Wed Dec 14 16:19:46 2011 |
Zach | Update | RF System | LO for new demod box | I'm not sure I agree with your conversions,
BUT:
The IQ boards use a PE4140, fancy |
|
|
6122
|
Wed Dec 14 18:06:39 2011 |
Zach | Update | RF System | LO for new demod box | Actually, the LO inputs to the IQ boards
have AP1053 (Cougar) amps on them. These |
|
|
6123
|
Wed Dec 14 19:59:12 2011 |
Jenne | Update | RF System | LO for new demod box |
|
|
|
15559
|
Sat Sep 5 14:28:03 2020 |
Koji | Update | General | LO beam: Fiber coupling work | 2PM: Arrived at the 40m. Started the work
for the coupling of the RF modulated LO beam
into a fiber. -> I left the lab |
|
|
17046
|
Fri Jul 29 18:24:53 2022 |
Tega | Update | BHD | LO beam power improved by factor of 6 after LO and AS beam alignment | [Yuta, Tega]
From our previous work (elog 17044) |
|
|
17040
|
Wed Jul 27 18:30:50 2022 |
yuta | Update | BHD | LO beam power at BHD DCPDs is significantly lower than expected | [Paco, Yehonathan, Yuta]
We measured power and counts at
BHD DCPDs with LO beam only and ITM single |
|
|
17042
|
Thu Jul 28 14:34:40 2022 |
Yehonathan | Update | BHD | LO beam power at BHD DCPDs is significantly lower than expected | {Yuta, Yehonathan}
We went to the BS table to check
the POP beam power. We first notice that |
|
|
13646
|
Wed Feb 21 12:17:04 2018 |
gautam | Update | CDS | LO Power mon channels added to c1lsc | To make this setup more permanent, I modified
the c1lsc |
|
|
14020
|
Tue Jun 26 17:20:33 2018 |
Jon | Configuration | Cameras | LLO Python Camera Software is Working | Thanks to a discussion yesterday with Joe
Betzweiser, I was able to identify and fix
the remaining problem with the LLO GigE camera |
|
|
1065
|
Tue Oct 21 18:19:42 2008 |
Yoichi | Configuration | Computers | LISO and Eagle installed | I installed LISO, a circuit simulation software,
into the control room linux machines.
I also installed a PCB CAD called Eagle to |
|
|
9488
|
Wed Dec 18 13:34:03 2013 |
Steve | Update | General | LIGOX people | 40m crew and visitor Holger Muller from
Berkeley. |
|
|
8776
|
Thu Jun 27 22:52:38 2013 |
Rana, Gabriele, Francesco | Summary | Computer Scripts / Programs | LIGO-DV installed | I installed ligoDV in the /ligo/apps/ligoDV/
Now, by pointing the tool at the
local NDS2 server (megatron:31200) you can |
|
|
2130
|
Wed Oct 21 16:18:12 2009 |
Steve | Summary | SAFETY | LIGO Safety Officers visited the 40m | David Nolting, chief LIGO Safety Officer
and his lieutenants from LLO and LHO paid
homage to the 40m lab this morning. |
|
|
4263
|
Tue Feb 8 16:44:43 2011 |
Jenne | Update | Computers | LIGO Grid Cluster client upgraded on Rossa | I did a yum-install of the latest ldg-client
(to get onto the LIGO Clusters) on Rossa.
I followed the instructions on the |
|
|
11899
|
Wed Dec 23 03:27:04 2015 |
rana | Update | Computer Scripts / Programs | LHO EPICS slow down | https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=24321
This LHO log indicates that EPICS
slow down could be due to NFS activity. Could |
|
|
12943
|
Thu Apr 13 21:01:20 2017 |
rana | Configuration | Computers | LG UltraWide on Rossa | we installed a new curved 34" doublewide
monitor on Rossa, but it seems like it has
a defective dead pixel region in it. Unless |
|
|
6247
|
Fri Feb 3 16:13:49 2012 |
steve | Update | PEM | LED lights for chamber illumination | Cold
LED lights replaced hot halogen ones.
Flat LED MYAL 6S, model #112560002 |
|
|
17292
|
Mon Nov 21 14:55:58 2022 |
JC | Configuration | General | LED Instead of Incandescent Lights | Electrical came by today to see the lights.
The issue may be the switches, but they will
come by tomorrow to solve the issue. A couple |
|
|
17323
|
Wed Nov 30 10:48:10 2022 |
JC | Configuration | General | LED Instead of Incandescent Lights | All incondescent lightsbulbs have been
switched over to LED.
|
|
|
188
|
Wed Dec 12 16:22:22 2007 |
alberto | Omnistructure | Electronics | LC filter for the RF-AM monitor circuit | In the LC configuration (see attached schematic)
the resonant frequency is tuned to one of
the peak of our RF-AM monitor and it is amplified |
|