| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16148
|
Thu May 20 16:56:21 2021 |
Koji | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | HP HV power supply ( HP6209
) were returned to Downs |
|
|
16149
|
Fri May 21 00:05:45 2021 |
Koji | Update | SUS | New electronics: Sat Amp / Coil Drivers | 11 new Satellite Amps were picked up from
Downs. 7 more are coming from there. I have
one spare unit I made. 1 sat amp has already |
|
|
16150
|
Fri May 21 00:15:33 2021 |
Koji | Update | Electronics | DC Power Strip delivered / stored | DC Power Strip Assemblies delivered and
stored behind the Y arm tube (Attachment
1) |
9x |
|
16151
|
Fri May 21 09:44:52 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | The transfer function given in the previous
post was slightly incorrect the units
did not make sense the new function is: |
|
|
16152
|
Fri May 21 12:12:11 2021 |
Paco | Update | NoiseBudget | AUX PDH loop identification | [Anchal, Paco]
We went into 40m to identify where
XARM PDH loop control elements are. We didn't |
|
|
16153
|
Fri May 21 14:36:20 2021 |
Ian MacMillan | Update | CDS | SUS simPlant model | The plant transfer function of the pendulum
in the s domain is:
|
|
|
16154
|
Sun May 23 18:28:54 2021 |
Jon | Update | CDS | Opto-isolator for c1auxey | The new HAM-A coil drivers have a single
DB9 connector for all the binary inputs.
This requires that the dewhitening switching signals |
|
|
16155
|
Mon May 24 08:38:26 2021 |
Chub | Update | Electronics | 18-bit AI, 16-bit AI and 16-bit AA | - High priority units: 2x 18AI / 1x 16AI
/ 3x 16AA
All six are reworked and on the |
|
|
16156
|
Mon May 24 10:19:54 2021 |
Paco | Update | General | Zita IOO strip | Updated IOO.strip on Zita to show WFS2
pitch and yaw trends (C1:IOO-WFS2_PIY_OUT16 |
|
|
16160
|
Tue May 25 17:08:17 2021 |
Chub | Update | Electronics | chassis rework complete! | All remaining chasses have been reworked
and placed on the floor along the west wall
in Room 104. |
|
|
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 |
|