| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16518
|
Thu Dec 16 18:16:36 2021 |
Yehonathan | Update | BHD | SOS assembly | Today I glued magnets onto the new 3/4"
mirror adapters. I also took the opportunity
to make some more side magnets assemblies. |
|
|
16520
|
Fri Dec 17 17:50:17 2021 |
Yehonathan | Update | BHD | SOS assembly | I threaded a new wire through a different
side block with a magnet and clamped it under
a microscope. It was hard, but eventually, |
|
|
16521
|
Fri Dec 17 19:16:45 2021 |
Koji | Update | BHD | SOS assembly | We @40m do the convention of the arrow
at the thinnest side & pointing the HR
side, but nobody says Lambda does the same. |
|
|
16523
|
Fri Dec 17 22:16:07 2021 |
Yehonathan | Update | BHD | SOS assembly | I specifically checked the specification
before mounting the mirror. It says clearly
"Arrow at the thinnest location pointing |
|
|
16524
|
Sat Dec 18 00:56:14 2021 |
Koji | Update | BHD | SOS assembly | Sad... We just need to check the wedge
direction everytime, unfortunately.
Pencil: can you try to gently wipe |
|
|
16526
|
Mon Dec 20 13:52:01 2021 |
Koji | Update | BHD | SOS assembly | LO1: No need to remove
the pencil mark for the damping test. Until
we see serious contamination on the LO1 optic, |
|
|
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 |
|
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 |
|
|
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 |
|
|
16545
|
Thu Jan 6 11:54:20 2022 |
Anchal | Summary | BHD | Part IX of BHR upgrade - Placed AS1 and AS4 | [Paco (Vacuum Work), Anchal]
Today we opened the ITMY Chamber
and installed suspended AS1 and AS4 in their |
|
|
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 |
|
|
16552
|
Thu Jan 6 21:04:41 2022 |
Anchal | Summary | BHD | Part VIII of BHR upgrade - LO1 OSEMs inserted | [Anchal, Koji] Part of elog:
40m/16549.
The magnets on the mirror face |
|
|
16554
|
Fri Jan 7 16:17:42 2022 |
Anchal | Summary | BHD | Part IX of BHR upgrade - Placed AS1 and AS4 filters | [paco]
Added input filters, input matrix,
damping filters, output matrix, coil filters, |
|
|
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. |
|
|
16559
|
Sat Jan 8 16:01:42 2022 |
Paco | Summary | BHD | Part IX of BHR upgrade - Placed LO2 filters | Added input filters, input matrix, damping
filters, output matrix, coil filters, and
copy the state over from ITMX into LO2 |
|
|
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) |
|
|
16562
|
Mon Jan 10 14:52:51 2022 |
Anchal | Summary | BHD | LO1 OSEMs roughly calibrated and noise measured | I used the open light level output of 908
for ITMX side OSEM from 40m/16549
to roughly calibrate cts2um filter module |
|
|
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.
|
|
|
16567
|
Mon Jan 10 18:36:41 2022 |
Anchal | Summary | BHD | LO1 free swinging test set to trigger | LO1 is set to go through a free swinging
test at 1 am tonight. We have used this script
(scripts/SUS/InMatCalc/freeSwing.py) reliably |
|
|
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. |
|
|
16572
|
Tue Jan 11 12:19:12 2022 |
Anchal | Summary | BHD | LO1 Input Matrix Diagonalization performed. | The frree swinging test was successful.
I ran the input matrix diagonalization code
(scripts/SUS/InMAtCalc/sus_diagonalization.py) |
|
|
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 |
|
|
16577
|
Tue Jan 11 18:18:29 2022 |
Anchal | Summary | BHD | Attempted OSEM installation on AS1 | [Anchal, Paco, Yehonathan]
Connected in-cir cable to new flange
on ITMY Chamber |
|
|
16578
|
Tue Jan 11 18:40:25 2022 |
Anchal | Summary | BHD | AS1 Sat Amp has a PCB issue | AS1
Sat Amp (S2100741) has a critical PCB
issue on it's Ch5-8 board S2100548. This |
|
|
16579
|
Thu Jan 13 09:48:41 2022 |
Anchal | Summary | BHD | AS1 Sat Amp fixed | I fixed the issue in AS1
Sat Amp (S2100741) by using a razor blade.
I cut the short between the two places, cleaned |
|
|
16580
|
Thu Jan 13 12:24:08 2022 |
Anchal | Summary | BHD | AS1 SD and LR magnets broke | [Anchal (vacuum work), Paco (outside)]
After the AS1 Sat Amp fix (40m/16579),
we today were able to tune all OSEMs to the |
|
|
16581
|
Thu Jan 13 12:29:27 2022 |
Anchal | Summary | BHD | AS4 LR magnet broke | After the debacle with AS1 (40m/16580),
we decided the put the PEEK earthquake stop
by first removing the lower OSEM plate and |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
16590
|
Fri Jan 14 18:12:47 2022 |
Anchal | Summary | BHD | AS4 placed in ITMY Chamber, OSEMs connected | AS4 was succesfully suspended and trasported
to ITMY chamber (40m/16589).
We placed it near the door to make it easy |
|
|
16591
|
Tue Jan 18 14:26:09 2022 |
Paco | Summary | BHD | Part IX of BHR upgrade - Placed remaining filters SR2, PR3, PR2 | [Anchal, Paco]
Added input filters, input matrix,
damping filters, output matrix, coil filters, |
|
|
16592
|
Tue Jan 18 15:19:49 2022 |
Paco | Summary | BHD | Part IV of BHR upgrade - Replaced old SR3 with SOS SR2. OSEM tuning attemtped. | [Tega, Anchal, Paco]
We started working on SR2 installation.
Preliminary work involved |
|
|
16593
|
Tue Jan 18 18:16:28 2022 |
Anchal | Summary | BHD | Part IV of BHR upgrade - SR2 Sat Amp Box inspection | I tested the monitor ports on the SR2
Sat Amp Box but found that all LED Mon
and PD Mon are giving expected values. I |
|