ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
16235
|
Thu Jul 1 16:45:25 2021 |
Yehonathan | Update | BHD | SOS assembly | The bonding test passed - the weight still
hangs from the dumbell. Unfortunately, I
broke the bond trying to release the assembly |
|
16234
|
Thu Jul 1 11:37:50 2021 |
Paco | Update | General | restarted c0rga | Physically rebooted c0rga workstation after
failing to ssh into it (even as it was able
to ping into it...) the RGA seems to be off |
|
16233
|
Thu Jul 1 10:34:51 2021 |
Paco, Anchal | Summary | LSC | ETMY QPD fixed | Paco worked on alignign the beam splitter
to get light on the ETMY QPD and was successful
in centering it without any other changes |
|
16232
|
Wed Jun 30 18:44:11 2021 |
Anchal | Summary | LSC | Tried fixing ETMY QPD | I worked in Yend station, trying to get
the ETMY QPD to work properly. When I started,
only one (quadrant #3) of the 4 quadrants |
|
16231
|
Wed Jun 30 15:31:35 2021 |
Anchal | Summary | Optical Levers | Centered optical levers on ITMY, BS, PRM and ETMY | When both arms were locked, we found that
ITMY optical lever was very off-center. This
seems to have happened after the c1susaux |
|
16230
|
Wed Jun 30 14:09:26 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | I have looked at my code from the previous
plot of the transfer function and realized
that there is a slight error that must be |
 |
16229
|
Tue Jun 29 20:45:52 2021 |
Yehonathan | Update | BHD | SOS assembly | I glued another batch of 6 magnet+dumbell
assemblies. I will take a look at them under
the microscope once they are cured. |
 |
16228
|
Tue Jun 29 17:42:06 2021 |
Anchal, Paco, Gautam | Summary | LSC | MICH locking tutorial with Gautam | Today we went through LSC locking mechanics
with Gautam and as a "Hello World"
example, worked on locking michelson cavity. |
|
16227
|
Mon Jun 28 12:35:19 2021 |
Yehonathan | Update | BHD | SOS assembly | On Thursday, I glued another set of 6 dumbells+magnets
using the same method as before. I made sure
that dumbells are pressed onto the magnets. |
    |
16226
|
Fri Jun 25 19:14:45 2021 |
Jon | Update | Equipment loan | Zurich Instruments analyzer | I returned the Zurich Instruments analyzer
I borrowed some time ago to test out at home.
It is sitting on first table across from |
|
16225
|
Fri Jun 25 14:06:10 2021 |
Jon | Update | CDS | Front-End Assembly and Testing | Summary
Here is the final
summary (from me) of where things stand with
the new front-end systems. With Anchal and |
|
16224
|
Thu Jun 24 17:32:52 2021 |
Ian MacMillan | Update | CDS | Front-End Assembly and Testing | Anchal and I ran tests on the two systems
(C1-SUS2 and C1-BHD). Attached are the results
and the code and data to recreate them. |
  |
16223
|
Thu Jun 24 16:40:37 2021 |
Koji | Update | SUS | MC lock acquired back again | [Koji, Anchal]
The issue
of the PD output was that the PD whitened |
|
16222
|
Wed Jun 23 09:05:02 2021 |
Anchal | Update | SUS | MC lock acquired back again | MC was unable to acquire lock because the
WFS offsets were cleared to zero at some
point and because of that MC was very misaligned |
|
16221
|
Tue Jun 22 17:05:26 2021 |
Yehonathan | Update | BHD | SOS assembly | According to the schematics,
the distance between the original EQ tap
holes is 0.5". Given that the original |
|
16220
|
Tue Jun 22 16:53:01 2021 |
Ian MacMillan | Update | CDS | Front-End Assembly and Testing | The channels on both the C1BHD and C1SUS2
seem to be frozen: they arent updating and
are holding one value. To fix this Anchal |
|
16219
|
Tue Jun 22 16:52:28 2021 |
Paco | Update | SUS | ADC/Slow channels issues | After sliding the alignment bias around
and browsing through elog while searching
for "stuck" we concluded the ITMX |
|
16218
|
Tue Jun 22 11:56:16 2021 |
Anchal, Paco | Update | SUS | ADC/Slow channels issues | We checked back in time to see how the
BS and PRM OSEM slow channels are zero. It
was clear that they became zero when we worked |
|
16217
|
Mon Jun 21 17:15:49 2021 |
Ian MacMillan | Update | CDS | CDS Upgrade | Anchal and I wrote a script (Attachment
1) that will test the ADC and DAC connections
with inputs on the INMON |
|
16216
|
Fri Jun 18 23:53:08 2021 |
Koji | Update | BHD | SOS assembly | Then, can we replace the four small EQ
stops at the bottom (barrel surface) with
two 1/4-20 EQ stops? This will require drilling |
|
16215
|
Fri Jun 18 19:02:00 2021 |
Yehonathan | Update | BHD | SOS assembly | Today I glued some magnets to dumbells.
First, I took 6 magnets (the maximum
I can glue in one go) and divided them into |
  |
16214
|
Fri Jun 18 14:53:37 2021 |
Anchal | Summary | PEM | Temperature sensor network proposal | I propose we set up a temperature sensor
network as described in attachment 1.
Here there are two types of units: |
|
16213
|
Fri Jun 18 10:07:23 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF with coherence | We did the measurement of OLTF for Xend
green laser PDH loop with excitation added
at control point using a SR560 as shown in |
 |
16212
|
Thu Jun 17 22:25:38 2021 |
Koji | Update | SUS | New electronics: Sat Amp / Coil Drivers | It is a belated report: We received 5 more
sat amps on June 4th. (I said 7 more but
it was 6 more) So we still have one more |
|
16211
|
Thu Jun 17 22:19:12 2021 |
Koji | Update | Electronics | 25 HAM-A coil driver units delivered | 25 HAM-A coil driver units
were fabricated by Todd and I've transported
them to the 40m. |
|
16210
|
Thu Jun 17 16:37:23 2021 |
Anchal, Paco | Update | SUS | c1susaux computer rebooted | Jon suggested to reboot the acromag chassis,
then the computer, and we did this without
success. Then, Koji suggested we try running |
|
16209
|
Thu Jun 17 11:45:42 2021 |
Anchal, Paco | Update | SUS | MC1 Gave trouble again | TL;DR
MC1 LL Sensor showed signs of fluctuating
large offsets. We tried to find the issue |
 |
16208
|
Thu Jun 17 11:19:37 2021 |
Ian MacMillan | Update | CDS | CDS Upgrade | Jon and I tested the ADC and DAC cards
in both of the systems on the test stand.
We had to swap out an 18-bit DAC for a 16-bit |
|
16207
|
Wed Jun 16 20:32:39 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | I installed 2 additional isolators in the
Acromag chassis. I set all the input channels
to PNP. I ran the digital inputs (EnableMon |
|
16206
|
Wed Jun 16 19:34:18 2021 |
Koji | Update | General | HVAC | I made a flow sensor with a stick and tissue
paper to check the airflow.
- The HVAC indicator was not lit, |
    |
16205
|
Wed Jun 16 17:24:29 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | I updated the wiring diagram according
to Koji's suggestion. According to the |
|
16204
|
Wed Jun 16 13:20:19 2021 |
Anchal, Paco | Summary | Cameras | Mon 7 in Control Room Replaced | We replaced the Mon 7 with an LCD monitor
from back bench. It is fed the analog signal
from BNC converted into VGS with a converter |
|
16203
|
Tue Jun 15 21:48:55 2021 |
Koji | Update | CDS | Opto-isolator for c1auxey | If my understanding is correct, the (photo
receiving) NPN transistor of the optocoupler
is energized through the acromag. The LED |
|
16202
|
Tue Jun 15 15:26:43 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF measurement loop algebra, excitation at control point | Attachment 1 shows the case when excitation
is sent at control point i.e. the PZT output.
As before, free running laser noise |
|
16201
|
Tue Jun 15 11:46:40 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | I have added more degrees of freedom. The
model includes x, y, z, pitch, yaw, roll
and is controlled by a matrix of transfer |
 |
16200
|
Mon Jun 14 18:57:49 2021 |
Anchal | Update | AUX | Xend is unbearably hot. Green laser is loosing lock in 10's of seconds | Working in Xend with mask on has become
unbearable. It is very hot there and I would
really like if we fix this issue. |
 |
16199
|
Mon Jun 14 15:31:30 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | I checked the BI situation on the HAM-A
coil driver. It seems like these are
sinking BIs and indeed need to be isolated |
|
16198
|
Fri Jun 11 20:19:50 2021 |
Koji | Summary | BHD | BHD OMC invacuum wiring | Stephen and I discussed the in-vacuum OMC
wiring.
- One of the OMCs has already been |
|
16197
|
Thu Jun 10 14:01:36 2021 |
Anchal | Summary | AUX | Xend Green Laser PDH OLTF measurement loop algebra | Attachment 1 shows the closed loop of Xend
Green laser Arm PDH lock loop. Free running
laser noise gets injected at laser head after |
|
16196
|
Wed Jun 9 18:29:13 2021 |
Anchal, Paco | Summary | ALS | Check for saturation in ITMX SOS Driver | We did a quick check to make sure there
is no saturation in the C1:SUS-ITMX_LSC_EXC
analog path. For this, we looked at the SOS |
|
16195
|
Wed Jun 9 13:50:48 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | I have attached an updated transfer function
graph with the residual easier to see. I
thought here I would include a better explanation |
|
16194
|
Wed Jun 9 11:46:01 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF measurement | We measured the Xend green laser PDH Open
loop transfer function by following method:
We first measured the feedback |
  |
16193
|
Tue Jun 8 11:54:39 2021 |
Yehonathan | Update | CDS | BI channels on c1auxey | I tested the digital inputs the following
way: I connected a DB9 breakout to DB9M-5
and DB9M-6 where digital inputs are hosted. |
|
16192
|
Tue Jun 8 11:40:53 2021 |
Anchal, Paco | Summary | ALS | Single Arm Actuation Calibration with IR ALS Beat | We attempted to simulate "oscillator
based realtime calibration noise monitoring"
in offline analysis with python. This helped |
|
16191
|
Mon Jun 7 17:49:19 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | Added difference to the graph. I included
the code so that others could see what it
looks like and use it for easy use. |
 |
16190
|
Mon Jun 7 15:37:01 2021 |
Anchal, Paco, Yehonathan | Summary | Cameras | Mon 7 in Control Room Died | We found Mon7 in control room dead today
afternoon. It's front power on green
light is not lighting up. All other monitors |
|
16189
|
Mon Jun 7 13:14:20 2021 |
Yehonathan | Update | CDS | BI channels on c1auxey | I added a new XT1111 Acromag module to
the c1auxey chassis. I sanitized and configured
it according to the slow |
|
16188
|
Sun Jun 6 16:33:47 2021 |
Jon | Update | CDS | BI channels on c1auxey |
There |
|
16187
|
Sun Jun 6 15:59:51 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | According to the BO interface circuit board
https://dcc.ligo.org/D1001266,
PCIN wires are connected to the coil driver |
|
16186
|
Sun Jun 6 12:15:16 2021 |
Jon | Update | CDS | Opto-isolator for c1auxey | Since this Ocean Controls optoisolator
has been shown to be compatible, I've
gone ahead and ordered 10 more: |
|