| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16527
|
Mon Dec 20 14:10:56 2021 |
Anchal | Update | BHD | All coil drivers ready to be used, modified and tested | Koji found some 68nF caps from Downs and
I finished modifying the last remaining coil
driver box and tested it. |
|
|
16528
|
Mon Dec 20 17:26:13 2021 |
Yehonathan | Update | BHD | SOS assembly | {Yehonathan, Anchal}
I released the AS1 wires from the
winches, removed the adapter from the SOS |
7x |
|
16529
|
Tue Dec 21 16:35:39 2021 |
Koji | Update | VAC | ITMX NW feedthru (LO1-1) connector pin bent | I've received a report that a pin of
an ITMX NW feedthru connector was bent. (Attachment
1) |
|
|
16531
|
Tue Dec 21 18:04:46 2021 |
Yehonathan | Update | BHD | SOS assembly | I locked the EQ stops while retaining the
XY alignment on the QPD and installed 5 green
OSEMs. AS1 is ready for transfer into the |
|
|
16532
|
Wed Dec 22 14:57:05 2021 |
Koji | Update | General | chiara local backup | chiara
local backup of /cvs/cds has not been running
since the move of chiara in Nov 19. |
|
|
16534
|
Wed Dec 22 18:16:23 2021 |
Koji | Update | SUS | Remaining task for 2021 | The in-vacuum installation team has reported
that the side OSEMs of ITMX and LO1 are going
to be interfering if place LO1 at the planned |
|
|
16535
|
Thu Dec 23 16:38:21 2021 |
Koji | Update | General | Is megatron down? (Re: chiara local backup) | The local backup seems working fine again.
But I found that megatron
is down and this is a real issue. This should |
|
|
16536
|
Fri Dec 24 16:49:41 2021 |
Koji | Update | General | Is megatron down? (Re: chiara local backup) | It turned out that the UPS installed on
Nov 22 failed (cf https://nodus.ligo.caltech.edu:8081/40m/16479
). As a fact, it was alive just for |
|
|
16538
|
Sun Jan 2 20:46:46 2022 |
Koji | Update | SUS | End SUS Electronics building | 19:00~ Start working on the electronics
bench
The following units were tested |
|
|
16539
|
Mon Jan 3 12:05:08 2022 |
Paco | Update | BHD | 1Y0 rack work for LO2 AS1 AS4 | [Paco, Anchal]
Continue working on 1Y0. Added
coil drivers for LO2, AS1, AS4. Anchal made |
|
|
16540
|
Mon Jan 3 16:46:41 2022 |
Paco | Update | BHD | 1Y1 rack work for SR2, PR2, PR3 | [Paco, Anchal]
Continued working on 1Y1 rack.
Populated the 6 coil drivers, made all connections |
|
|
16541
|
Tue Jan 4 18:26:59 2022 |
Anchal | Update | BHD | Tested 2" PR2 candidates transmission | I used the rejected light from the PBS
after the motorized half-wave plate between
PMC and IMC injection path (used for input |
|
|
16542
|
Tue Jan 4 18:27:23 2022 |
Paco | Update | BHD | SOS assembly -- PR3 | [yehonathan, paco, anchal]
We continue suspending PR3 today.
Yehonathan and Paco suspended the thick optic |
|
|
16543
|
Wed Jan 5 17:46:04 2022 |
Anchal | Update | BHD | Tested 2" PR2 candidates transmission | I tested 2 more optics today, the old PR2
that we took out and another optic I found
in QIL. Both these optics are also not good |
|
|
16544
|
Wed Jan 5 19:18:06 2022 |
Yehonathan | Update | BHD | SOS assembly -- AS4 | {Paco, Yehonathan, Anchal}
Today we suspended AS4
(E2000226-B |
|
|
16546
|
Thu Jan 6 12:52:49 2022 |
Anchal | Update | CDS | Yearly DAQD fix 2022! | Just as predicted, all realtime models
reported "0x4000" error. Read the
parent post for more details. I fixed this |
|
|
16547
|
Thu Jan 6 13:54:28 2022 |
Koji | Update | CDS | Yearly DAQD fix 2022! | Just
restarting all the c1sus2 models fixed the
issue. (Attachment 1) |
|
|
16548
|
Thu Jan 6 14:08:14 2022 |
Koji | Update | CDS | More BHD SUS screens added to sitemap | More BHD SUS screens added to sitemap (Attachment
1) |
|
|
16549
|
Thu Jan 6 15:10:38 2022 |
Koji | Update | SUS | ITMX Chamber work | [Anchal, Koji]
===
Summary === |
|
|
16550
|
Thu Jan 6 17:00:20 2022 |
Yehonathan | Update | BHD | SOS assembly -- LO2 | {Paco, Yehonathan}
Today we suspended LO2 (E1800089) |
|
|
16551
|
Thu Jan 6 17:16:51 2022 |
Yehonathan | Update | BHD | Using Peek screws/nuts | There were several cases where the long
EQ stops didn't perform as expected.
In one type of case, we used a |
|
|
16553
|
Thu Jan 6 22:18:47 2022 |
Koji | Update | CDS | SUS screen debugging | Indicated by the red arrow:
Even when the side damping servo is
off, the number appears at the input of the |
|
|
16555
|
Fri Jan 7 17:54:13 2022 |
Anchal | Update | BHD | PR2 Sat Amp has a bad channel | [Anchal, Paco]
Yesterday we noticed that one of
the ADC channels was overflowing. I checked |
|
|
16556
|
Fri Jan 7 17:59:45 2022 |
Yehonathan | Update | BHD | SOS assembly -- SR2 | {Yehonathan, Paco}
{Paco, Yehonathan}
Today we suspended SR2 ( |
|
|
16557
|
Fri Jan 7 18:24:25 2022 |
Koji | Update | BHD | SOS assembly -- SR2 | Vacseal in the freezer. It could have been
expired sooooo many years ago, We need some
cure testing. |
|
|
16558
|
Fri Jan 7 18:28:13 2022 |
Koji | Update | BHD | PR2 Sat Amp has a bad channel | Leave the unit to me. I can look it at
on Mon. For a while, you can take a replacement
unit from the electronics stack. |
|
|
16560
|
Mon Jan 10 13:35:52 2022 |
Anchal | Update | BHD | PR2 Sat Amp has a bad channel | The unit was tested before by Tege. The
test included testing the testpoint voltages
only. He summarized his work in |
|
|
16561
|
Mon Jan 10 14:00:44 2022 |
not Koji | Update | BHD | SOS assembly -- SR2 | Yes,
For the thin optics adapter design,
we want Peek 1/4-20 screw (part # 98885A131) |
|
|
16563
|
Mon Jan 10 15:45:55 2022 |
Paco | Update | Electronics | ITMY feedthroughs and in-vac cables installed - part I | The ITMY 10" flange with 10 DSUB-25
feedthroughs has been installed with the
cables connected at the in-vac side. |
|
|
16564
|
Mon Jan 10 15:59:46 2022 |
Koji | Update | BHD | PR2 Sat Amp has a bad channel | The issue was present in the cable between
the small adapter board and the rear panel.
The cable and the Dsub 25 connectors were |
6x |
|
16565
|
Mon Jan 10 17:04:47 2022 |
Anchal | Update | BHD | AS1 Sat Amp CH2 had offset | We found that there was a small offset
(~300 mV) at TP6 and TP8, in PD2 circuit
(CH2 of the board). I replaced U3 AD822ARZ |
|
|
16566
|
Mon Jan 10 18:20:45 2022 |
Anchal | Update | BHD | Tested 2" PR2 candidates transmission | I tested 2 more optics found by Paco and
Yehonathan in QIL.
|
|
|
16568
|
Tue Jan 11 09:53:14 2022 |
not Koji | Update | BHD | SOS assembly -- Peek screws and nuts | I handed the Peek parts we got from McMaster
to Jordan for C&B. |
|
|
16569
|
Tue Jan 11 10:23:18 2022 |
Paco | Update | Electronics | ITMY feedthroughs and in-vac cables installed - part II | [Paco, Chub]
The ITMY 10" flange with 4
DSUB-25 feedthroughs has been installed with |
|
|
16570
|
Tue Jan 11 10:46:07 2022 |
Tega | Update | CDS | SUS screen debugging | Seen. Thanks.
Red Arrow: The channel was labeled
incorrectly as INMON instead of OUTPUT |
|
|
16571
|
Tue Jan 11 10:58:58 2022 |
Tega | Update | SUS | Temporary watchdog | Started working on this. First created
a git repo for tracking https://git.ligo.org/40m/susaux.git
I have looked through the folder |
|
|
16573
|
Tue Jan 11 13:43:14 2022 |
Koji | Update | SUS | Temporary watchdog | I don't remember the syntax of the
db file, but here this calc channel computes
A&B. And A&B corresponds to INPA |
|
|
16574
|
Tue Jan 11 14:21:53 2022 |
Paco | Update | Electronics | BS feedthroughs and in-vac cables installed | [Paco, Yehonathan, Chub]
The BS chamber 10" flange
with 4 DSUB-25 feedthroughs has been installed |
|
|
16575
|
Tue Jan 11 15:21:16 2022 |
Anchal | Update | BHD | PR2 transmission calculation | I did this simple calculation where I assumed
1W power from laser and 10% transmission
past IMC. We would go ahead with V6-704/V6-705 |
|
|
16582
|
Thu Jan 13 16:08:00 2022 |
Yehonathan | Update | BHD | gluing magnets after AS1/4 misfortune | {Yehonathan, Anchal, Paco}
In the cleanroom, we removed AS1
and AS4 from their SOS towers. We removed |
|
|
16583
|
Thu Jan 13 17:10:55 2022 |
Anchal | Update | BHD | PR2 transmission calculation | I corrected the calculation by adding losses
by the arm cavity ends times the arm cavity
finesse and also taking into account the |
|
|
16584
|
Fri Jan 14 03:07:04 2022 |
Koji | Update | BHD | PR2 transmission calculation | I opened the notebook but I was not sure
where you have the loss per bounce for the
arm cavity. |
|
|
16585
|
Fri Jan 14 11:00:29 2022 |
Anchal | Update | BHD | PR2 transmission calculation | Yeah, I counted the loss from arm cavities
as the transmission from ETMs on each bounce.
I assumed Michelson to be perfectly aligned |
|
|
16586
|
Fri Jan 14 12:01:21 2022 |
Anchal | Update | Electronics | BS & ITMY feedthroughs labeled and connected to Sat Amps | I labeled all the newly installed flanges
and connected the in-air cables (40m/16530)
to appropriate ports. These cables are connected |
|
|
16587
|
Fri Jan 14 13:46:25 2022 |
Anchal | Update | BHD | PR2 transmission calculation updated | I updated the arm cavity roundtrip losses
due to scattering. Yehonathan told me that
arm cavity looses 50ppm every roundtrip other |
|
|
16588
|
Fri Jan 14 14:04:51 2022 |
Paco | Update | Electronics | RFSoC 2x2 board arrived | The Xilinx RFSoC 2x2 board arrived right
before the winter break, so this is kind
of an overdue elog. I unboxed it, it came |
|
|
16589
|
Fri Jan 14 17:33:10 2022 |
Yehonathan | Update | BHD | AS4 resurrection | {Yehonathan, Anchal}
Came this morning, the gluing of
the magnets was 100% successful. Side blocks, |
|
|
16597
|
Wed Jan 19 14:41:23 2022 |
Koji | Update | BHD | Suspension Status | Is this the correct status? Please
directly update this entry.
|
|
|
16598
|
Wed Jan 19 16:22:48 2022 |
Anchal | Update | BHD | PR2 transmission calculation updated | I have further updated my calculation.
Please find the results in the attached pdf.
Following is the description of |
|
|
16599
|
Wed Jan 19 18:15:34 2022 |
Yehonathan | Update | BHD | AS1 resurrection | Today I suspended AS1. Anchal helped me
with the initial hanging of the optics. Attachments
1,2 show the roll balance and side magnet |
|