| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
16238
|
Tue Jul 6 10:47:07 2021 |
Paco, Anchal | Update | IOO | Restored MC | MC was unlocked and struggling to recover
this morning due to misguided WFS offsets.
In order to recover from this kind of issue, |
|
|
16239
|
Tue Jul 6 16:35:04 2021 |
Anchal, Paco, Gautam | Update | IOO | Restored MC | We found that megatron is unable to properly
run scripts/MC/WFS/mcwfsoff and scripts/MC/WFS/mcwfson
scripts. It fails cdsutils commands due to |
|
|
16243
|
Fri Jul 9 18:35:32 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | Following Koji's channel list review,
we made changes to the
wiring spreadsheet. |
|
|
16244
|
Mon Jul 12 18:06:25 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | I edited /cvs/cds/caltech/target/c1auxey1/ETMYaux.db
(after creating a backup) and added the spare
coil driver channels. |
|
|
16245
|
Wed Jul 14 16:19:44 2021 |
gautam | Update | General | Brrr | Since the repair work, the temperature
is significantly cooler. Surprisingly, even
at the vertex (to be more specific, inside |
|
|
16246
|
Wed Jul 14 19:21:44 2021 |
Koji | Update | General | Brrr | Jordan reported on Jun 18, 2021:
"HVAC tech came today, and replaced |
|
|
16247
|
Wed Jul 14 20:42:04 2021 |
gautam | Update | LSC | Locking | [paco, gautam]
we decided to give the PRFPMI lock
a go early-ish. Summary of findings today |
|
|
16248
|
Thu Jul 15 14:25:48 2021 |
Paco | Update | LSC | CM board | [gautam, paco]
We tested the CM board by implementing
the high bandwidth IR lock (single arm). |
|
|
16249
|
Fri Jul 16 16:26:50 2021 |
gautam | Update | Computers | Docker installed on nodus | I wanted to try hosting some docker images
on a "private" server, so I installed
Docker on nodus following the instructions |
|
|
16250
|
Sat Jul 17 00:52:33 2021 |
Koji | Update | General | Canon camera / small silver tripod / macro zoom lens / LED ring light borrowed -> QIL | Canon camera / small silver tripod / macro
zoom lens / LED ring light borrowed ->
QIL |
|
|
16251
|
Mon Jul 19 22:16:08 2021 |
paco | Update | LSC | PRFPMI locking | [gautam, paco]
Gautam managed to lock PRFPMI a
little before ~ 22:00 local time. The ALS |
|
|
16252
|
Wed Jul 21 14:50:23 2021 |
Koji | Update | SUS | New electronics | Received:
Jun 29, 2021 BIO I/F 6 units
Jul 19, 2021 PZT Drivers x2 / QPD |
|
|
16253
|
Wed Jul 21 18:08:35 2021 |
yehonathan | Update | Loss Measurement | Loss measurement | {Gautam, Yehonathan, Anchal, Paco}
We prepared for the loss measurement
using DC reflection method. We did the following |
|
|
16254
|
Thu Jul 22 16:06:10 2021 |
Paco | Update | Loss Measurement | Loss measurement | [yehonathan, anchal, paco, gautam]
We concluded estimating the XARM
and YARM losses. The hardware configuration |
|
|
16255
|
Sun Jul 25 18:21:10 2021 |
Koji | Update | General | Canon camera / small silver tripod / macro zoom lens / LED ring light returned / Electronics borrowed | Camera and accesories returned
One HAM-A coildriver and one sat
amp borrowed -> QIL |
|
|
16256
|
Sun Jul 25 20:41:47 2021 |
rana | Update | Loss Measurement | Loss measurement | What are the quantitative root causes for
why the statistical uncertainty is so large?
Its larger than 1/sqrt(N) |
|
|
16257
|
Mon Jul 26 17:34:23 2021 |
Paco | Update | Loss Measurement | Loss measurement | [gautam, yehonathan, paco]
We went back to the loss data from
last week and more carefully estimated the |
|
|
16259
|
Tue Jul 27 17:14:18 2021 |
Yehonathan | Update | BHD | SOS assembly | Jordan has made 1/4" tap holes in
the lower EQ stop holders (attachment). The
1/4" stops (schematics) |
|
|
16260
|
Tue Jul 27 20:12:53 2021 |
Koji | Update | BHD | SOS assembly | 1 or 2. The stained ones are just fine.
If you find the vented 1/4-20 screws in the
clean room, you can use them. |
|
|
16261
|
Tue Jul 27 23:04:37 2021 |
Anchal | Update | LSC | 40 meter party | [ian, anchal, paco]
After our second attempt of locking
PRFPMI tonight, we tried to resotre XARM |
|
|
16262
|
Wed Jul 28 12:00:35 2021 |
Yehonathan | Update | BHD | SOS assembly | After receiving two new tubes of EP-30
I resumed the gluing activities. I made a
spreadsheet |
|
|
16263
|
Wed Jul 28 12:47:52 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | To simulate a differential output I used
two power supplies connected in series. The
outer connectors were used as the outputs |
|
|
16264
|
Wed Jul 28 17:10:24 2021 |
Anchal | Update | LSC | Schnupp asymmetry | [Anchal, Paco]
I redid the measurement of Schnupp
asymmetry today and found it to be 3.8 cm |
|