ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
16162
|
Wed May 26 02:00:44 2021 |
gautam | Update | Electronics | Coil driver noise | I was preparing a short write-up / test
procedure for the custom HV coil driver,
when I thought of something I can't resolve. |
 |
16165
|
Thu May 27 14:11:15 2021 |
Jordan | Update | SUS | CoM to Clamping Point Measurement for 3" Adapter Ring | The current vertical distance between the
CoM and the wire clamping point on the 3"
Ring assembly is 0.33mm. That is the CoM |
 |
16166
|
Fri May 28 10:54:59 2021 |
Jon | Update | CDS | Opto-isolator for c1auxey | I have received the opto-isolator needed
to complete the new c1auxey system. I
left it sitting on the electronics bench |
|
16167
|
Fri May 28 11:16:21 2021 |
Jon | Update | CDS | Front-End Assembly and Testing | An update on recent progress in the lab
towards building and testing the new FEs.
1. Timing problems resolved / |
   |
16169
|
Tue Jun 1 14:26:23 2021 |
Jordan | Update | SUS | CoM to Clamping Point Measurement for 3" Adapter Ring | After changing the material of the Balance
Mass from 6061 Al to 304 Steel, and changing
the thickness to 0.21" from 0.25". |
|
16170
|
Tue Jun 1 16:17:06 2021 |
Yehonathan | Update | BHD | SOS assembly | I tried to push the clean Viton tips into
the vented screws just to find out that the
vented holes are too small. We need to drill |
|
16172
|
Wed Jun 2 01:03:19 2021 |
Koji | Update | BHD | SOS assembly | Can you just cut the viton tips smaller?
If you cut it to have some wedge (or say,
taper), it can get stuck with the vent hole. |
|
16173
|
Wed Jun 2 01:08:57 2021 |
Koji | Update | SUS | CoM to Clamping Point Measurement for 3" Adapter Ring | How about to use the non-Ag coated threaded
shaft + the end SS masses with helicoils
inserted? Does this save the masses to get |
|
16176
|
Wed Jun 2 17:50:50 2021 |
Paco | Update | Equipment loan | Borrow red cart | I borrowed the little red cart 🛒
to help clear the path for new optical tables
in B252 West Bridge. Will return once I am |
|
16177
|
Thu Jun 3 13:06:47 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | I was able to measure the transfer function
of the plant filter module from the channel X1:SUP-C1_SUS_SINGLE_PLANT_Plant_POS_Mod_EXC
to X1:SUP-C1_SUS_SINGLE_PLANT_Plant_POS_Mod_OUT. |
 |
16178
|
Thu Jun 3 17:15:17 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | As Jon wrote we need to use the NPN configuration
(see attachments). I tested the isolator
channels in the following way: |
 |
16180
|
Thu Jun 3 17:49:46 2021 |
Paco | Update | Equipment loan | Borrow red cart | Returned today.
|
|
16181
|
Thu Jun 3 22:08:00 2021 |
Koji | Update | CDS | Opto-isolator for c1auxey | - Could you explain what is the blue thing
in Attachment 1?
- To check the validity of the |
|
16182
|
Fri Jun 4 14:49:23 2021 |
Yehonathan | Update | CDS | Opto-isolator for c1auxey | I made a diagram (Attached). I think it
explains the blue thing in the previous post.
I don't know what is the grounding |
|
16183
|
Fri Jun 4 17:46:25 2021 |
unYehonathan | Update | CDS | Opto-isolator for c1auxey | I mounted the optoisolator on the DIN rail
and connected the 3 first channels
|
|
16184
|
Sun Jun 6 03:02:14 2021 |
Koji | Update | CDS | Opto-isolator for c1auxey | This RTS also use the BO interface with
an opto isolator. https://dcc.ligo.org/LIGO-D1002593
Could you also include the pull |
|
16185
|
Sun Jun 6 08:42:05 2021 |
Jon | Update | CDS | Front-End Assembly and Testing | Here is an update and status report on
the new BHD front-ends (FEs).
Timing
The changes |
  |
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: |
|
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 |
|
16188
|
Sun Jun 6 16:33:47 2021 |
Jon | Update | CDS | BI channels on c1auxey |
There |
|
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 |
|
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. |
 |
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. |
|
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 |
|
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 |
|
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. |
 |
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. |
 |