ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
15224
|
Tue Feb 25 19:58:06 2020 |
Hang | Update | IOO | MC2 coil balancing | [Yehonathan, Hang]
We did some quick DC balancing
of the MC2 coil drivers to reduce the l2a |
|
|
15223
|
Tue Feb 25 16:17:57 2020 |
Gautam, Hang | Update | CDS | | Seems that the GPS is out of sync on donatella.
We could not get any data from diaggui... |
|
|
15222
|
Mon Feb 24 08:36:32 2020 |
Chub | Update | General | HVAC repair | The HVAC people replaced a valve and repaired
the pneumatic plumbing on the roof air handler.
Temperature has been stable during the day |
|
|
15221
|
Sun Feb 23 18:15:22 2020 |
rana | Update | ALS | ALS OOL noise and PDH | to
make the comparisons meaningfully |
|
|
15220
|
Fri Feb 21 20:44:18 2020 |
shruti | Update | ALS | ALS OOL noise and PDH | [Meenakshi, Shruti]
In order to adjust the relative
phase for PDH locking, we used the Siglent |
|
|
15219
|
Fri Feb 21 13:02:53 2020 |
Koji | Update | ALS | PDH error signals? | Check out this elog:
ELOG
4354 |
|
|
15218
|
Fri Feb 21 10:59:08 2020 |
shruti | Update | ALS | PDH error signals? | |
|
|
15217
|
Wed Feb 19 22:20:22 2020 |
rana | Update | ALS | ALS OOL noise with arms locked | Could you please put physical units on
the Y-axis and also put labels in the legend
which give a physical description of what |
|
|
15216
|
Tue Feb 18 18:14:59 2020 |
shruti | Update | ALS | ALS OOL noise with arms locked | We proceeded with the trying to measure
the ALS out-of-loop noise of the X arm when
the X arm cavity is green-locked using different |
|
|
15215
|
Sat Feb 15 12:56:24 2020 |
Yehonathan | Update | IOO | IMC Transfer function measurement | {Yehonathan, Meenakshi}
We measure the IMC transfer function
using SR785. |
|
|
15214
|
Fri Feb 14 14:52:41 2020 |
gautam | Update | ALS | ALS OOL noise with arms locked | Unlikely, the alignment was probably just
not good. I restored the alignment and now
the arms can be locked to IR frequency. |
|
|
15213
|
Fri Feb 14 14:02:13 2020 |
shruti | Update | ALS | ALS OOL noise with arms locked | [Meenakshi, Shruti]
Even though we were not able to
lock the the IR beat (by enabling LSC) during |
|
|
15212
|
Fri Feb 14 00:53:50 2020 |
gautam | Update | ALS | Fast ALS - more setup | In the process of setting up some cabling
at 1Y2, I must've bumped a cable to the
c1lsc expansion chassis. Anyways, the c1lsc |
|
|
15211
|
Thu Feb 13 21:30:55 2020 |
shruti | Update | ALS | ALS OOL noise with arms locked | [Meenakshi, Gautam, Shruti]
Summary:
- We initially aligned the arm |
|
|
15210
|
Thu Feb 13 02:07:26 2020 |
gautam | Update | LSC | AO path transfer function measurement | Summary:
I measured the transfer function
of the AO path, and think that there are |
|
|
15209
|
Thu Feb 13 01:47:39 2020 |
gautam | Update | ALS | Fast ALS - delay line prep | A few years ago, Koji and I setup a delay
line phase shifter, which can be used to
impart a (switchable) delay to a signal path. |
|
|
15208
|
Wed Feb 12 12:13:37 2020 |
gautam | Update | LSC | AO path attempts | Summary:
The
PRFPMI can be controlled by a mix of ALS |
|
|
15207
|
Tue Feb 11 19:11:35 2020 |
shruti | Update | Computer Scripts / Programs | MATLAB on donatella | Tried to open MATLAB on Donatella and found
the error:
MATLAB is selecting |
|
|
15206
|
Tue Feb 11 16:39:00 2020 |
shruti | Update | ALS | AM/PM | The results of the AM/PM measurements:
Attachment 1: Traces
of 9 AM TFs overlaid on top of each other, |
|
|
15205
|
Mon Feb 10 15:55:46 2020 |
Jordan | Update | PSL | PMCTRANSPD | [Gautam, Jordan]
Gautam showed me how the PMCTRANSPD
signal was reading zero, and he suspected |
|
|
15204
|
Mon Feb 10 15:54:47 2020 |
Jordan | Update | PSL | Completed Acromag Wiring | All spare channels on the PSL acromag chassis
are connected with ~12in of spare wiring
for future use. |
|
|
15203
|
Mon Feb 10 15:04:42 2020 |
Jordan | Update | General | HDMI Routing for new tv | Ran HDMI to the new tv mounted on the north
wall of control room. |
|
|
15202
|
Mon Feb 10 10:07:20 2020 |
gautam | Update | PSL | PMC re-locked | I found the PMC unlocked this morning.
It was re-locked using the usual procedure.
I feel like this has been happening more |
|
|
15201
|
Mon Feb 10 09:40:54 2020 |
Larry Wallace | Summary | General | SolidWorks Computer Upgrade and Printer repair | On February 5, 2020, the Dell engineering
workstation located in the 40M lab, was
replaced with a newer Engineering workstation, |
|
|
15200
|
Fri Feb 7 19:39:10 2020 |
Koji | Update | LSC | More high BW POY experiments | This measurement tells you how the gain
balance between the SLOW_CM and AO paths
should be. Basically, what you need is to |
|
|
15199
|
Fri Feb 7 15:00:16 2020 |
gautam | Update | LSC | More high BW POY experiments | To study the evilution of the AO path TFs
a bit more, I've hooked up POY11_Q Mon
to IN1 of the CM board. I will revert the |
|
|
15198
|
Fri Feb 7 12:58:25 2020 |
Yehonathan | Update | General | Metal PMC parts | I took the metal PMC box and examined its
content and find the following items:
|
18x |
|
15197
|
Fri Feb 7 09:45:03 2020 |
shruti | Update | General | AM at X end | I took a few AM TF measurements at the
X end for which I:
Misaligned the ITMX (then |
|
|
15196
|
Fri Feb 7 02:41:28 2020 |
Koji | Update | General | office area temperature | Not sure what's wrong, but the workstation
desk is freezing cold again and the room
temp is 18degC (64degF). |
|
|
15195
|
Fri Feb 7 02:24:24 2020 |
gautam | Update | LSC | Some short notes | [koji, gautam]
Plots + interpretation tomorrow.
CM_Slow path can be used |
|
|
15194
|
Thu Feb 6 21:54:13 2020 |
Jon | Update | PSL | c1psl bench testing complete | Today I engineered the last piece
of the new c1psl system: the multi-bit
binary output (mbbo) channels that control |
|
|
15193
|
Thu Feb 6 16:14:44 2020 |
rana | Update | General | office area temperature | I changed the office area thermostate
near Steve's desk from 68F to 73F
today. Please |
|
|
15192
|
Thu Feb 6 01:25:50 2020 |
gautam | Update | LSC | Locking updates | Summary:
I managed to partially stabilize
the arm citculating powers - they stay in |
|
|
15191
|
Thu Feb 6 01:16:58 2020 |
gautam | Update | LSC | Diagnosis results | Summary:
I did some more detailed tests
to see if I could isolate where the excess |
|
|
15190
|
Wed Feb 5 21:13:17 2020 |
Yehonathan | Update | IOO | IMC Ringdowns extended data analysis | I translate the results obtained in the
previous elog to the IMC 3 mirror cavity.
I assume the loss in each mirror in the IMC |
|
|
15189
|
Wed Feb 5 21:04:10 2020 |
Yehonathan | Update | PSL | Bench testing of PSL ai channels | {Yehonathan, Jon}
We retested the failed ai channels.
Most of them got fixed by applying the inverse |
|
|
15188
|
Wed Feb 5 16:35:12 2020 |
gautam | Update | LSC | Diagnosis plan | The goal is to try and identify the source
of the excess ALS noise as the CARM offset
is reduced. The idea is to look at the MC_F |
|
|
15187
|
Wed Feb 5 08:57:11 2020 |
Yehonathan | Update | PSL | Bench testing of PSL ai channels | I checked the failed channels against
the EPICS database definitions and the yaml
file inputted to IFOTest. The channels where |
|
|
15186
|
Tue Feb 4 18:13:01 2020 |
Yehonathan | Update | PSL | Bench testing of PSL ai channels | {Yehonathan, Jon, Jordan}
I tested the ai channels of the
new PSL Acromag by looping an already-tested |
|
|
15185
|
Tue Feb 4 02:13:02 2020 |
gautam | Update | LSC | Locking updates | Summary:
The CARM-->RF transition remains
out of reach. No systematic diagnosis scheme |
|
|
15184
|
Mon Feb 3 15:22:39 2020 |
Jon | Update | PSL | c1psl progress/Acromag ADC grounding | I tested the c1psl AO channels on the electronics
bench on Friday. While I found all the wiring
to be correct, some of the channels exhibited |
|
|
15183
|
Mon Feb 3 13:54:10 2020 |
Yehonathan | Update | IOO | IMC Ringdowns extended data analysis | I extended the ringdown data analysis to
the reflected beam following Isogai
et al. |
|
|
15182
|
Fri Jan 31 16:57:09 2020 |
gautam | Update | General | Metal PMC parts | Jon brought over a box of parts for constructing
the metal PMCs. I have stored it along the
Y-arm, on top of the green optics cabinet. |
|
|
15181
|
Fri Jan 31 16:04:30 2020 |
gautam | Update | IOO | Input pointing drift | One factor which hampers locking efforts
is the apparent drift of the input beam into
the IFO. Over timescales of ~1 hour, I have |
|
|
15180
|
Thu Jan 30 22:02:42 2020 |
shruti | Update | General | delay line frequency discriminator for PM | I could not find any level 3 mixers, but
by adjusting the beat frequency the power
in each of the delay line channels rose to |
|
|
15179
|
Thu Jan 30 17:41:10 2020 |
gautam | Update | PSL | Errant FSS_INOFFSET change | You can trend the data for the past few
hours and see what the appropriate value.
I think |
|
|
15178
|
Thu Jan 30 17:31:28 2020 |
Jon | Update | PSL | Errant FSS_INOFFSET change | A script I was testing errantly set C1:PSL-FSS_INOFFSET
=> 10 V at about 5:30 pm. I manually reverted
the channel value to 0, but I don't know |
|
|
15177
|
Thu Jan 30 15:24:10 2020 |
? | Update | General | delay line frequency discriminator for PM | yes, its fine to use this
with a level 3 or level 7 mixer; let's |
|
|
15176
|
Thu Jan 30 12:52:10 2020 |
Jon | Update | BHD | Metal OMCs procured | Last night Yehonathan and I located the
two steel PMCs in the QIL, with help from
Anchal. They are currently sitting on my |
|