| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
16594
|
Tue Jan 18 18:19:22 2022 |
Koji | Summary | BHD | AS4 placed in ITMY Chamber, OSEMs connected | AS4 satellite amplifier D1002818
/ D080276 troubleshoot
I dug into the circuit to see what/where |
|
|
16595
|
Wed Jan 19 12:50:10 2022 |
Anchal | Summary | BHD | Part IV of BHR upgrade - SR2 OSEM tuning progress. | It was indeed the issue of the top OSEM
plate not being in the right place horizontally.
But the issue was more non-trivial. I believe |
|
|
16596
|
Wed Jan 19 12:56:52 2022 |
Paco | Summary | BHD | AS4 OSEMs installation | [Paco, Tega, Anchal]
Today, we started work on AS4 SOS
by checking the OSEM and cable. Swapping |
|
|
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 |
|
|
16602
|
Thu Jan 20 01:48:02 2022 |
Koji | Update | BHD | PR2 transmission calculation updated | IMC is not such lossy. IMC output is supposed
to be ~1W.
The critical coupling condition |
|
|
16603
|
Thu Jan 20 12:10:51 2022 |
Yehonathan | Update | BHD | AS1 resurrection | I was wondering whether I should take AS1
down to redo the wire clamping on the side
blocks. I decided to take the OpLev spectrum |
|
|
16604
|
Thu Jan 20 16:42:55 2022 |
Paco | Update | BHD | AS4 OSEMs installation - part 2 | [Paco]
Turns out, the shifting was likely
due to the table level. Because I didn't |
|
|
16605
|
Thu Jan 20 17:03:36 2022 |
Anchal | Summary | BHD | Part IV of BHR upgrade - SR2 OSEM tuned. | The main issue with SR2 OSEMs, now that
I think of it, was that the BS table was
very inclined due to the multiple things |
|
|
16607
|
Thu Jan 20 17:34:07 2022 |
Koji | Update | BHD | V6-704/705 Mirror now @Downs | The PR2 candidate V6-704/705 mirrors (Qty2)
are now @Downs. Camille picked them up for
the measurements. |
|
|
16608
|
Thu Jan 20 18:16:29 2022 |
Anchal | Update | BHD | AS4 set to trigger free swing test | AS4 is set to go through a free swinging
test at 10 pm tonight. We have used this
script (Git/40m/scripts/SUS/InMatCalc/ |
|
|
16609
|
Thu Jan 20 18:41:55 2022 |
Anchal | Summary | BHD | SR2 set to trigger free swing test | SR2 is set to go through a free swinging
test at 3 am tonight. We have used this script
(Git/40m/scripts/SUS/InMatCalc/freeSwing.py) |
|
|
16610
|
Fri Jan 21 11:24:42 2022 |
Anchal | Summary | BHD | SR2 Input Matrix Diagonalization performed. | The free swinging test
was successful. I ran the input matrix diagonalization
code ( |
|
|
16612
|
Fri Jan 21 14:51:00 2022 |
Koji | Update | BHD | V6-704/705 Mirror now @Downs | Camille@Downs measured the surface of these
M1 and M2 using Zygo. |
|
|
16613
|
Fri Jan 21 16:40:10 2022 |
Anchal | Update | BHD | AS4 Input Matrix Diagonalization performed. | The free swinging test was successful.
I ran the input matrix diagonalization code
(/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py) |
|
|
16616
|
Mon Jan 24 17:12:27 2022 |
rana | Update | BHD | AS4 Input Matrix Diagonalization performed. | I think our
suspension input matrix diagonalization is
not so robust usually because |
|
|
16617
|
Mon Jan 24 17:58:21 2022 |
Yehonathan | Update | BHD | PR2 Suspension | I picked up the PR2 mirrors (labeled M1,
M2) from Anchel's table and took them
to the cleanroom. By inspection, I spotted |
|
|
16618
|
Mon Jan 24 18:53:09 2022 |
Anchal | Summary | BHD | Part VIII of BHR upgrade - LO2 placed and OSEMs tuned | I placed LO2 in its planned position in
BS chamber, inserted the OSEMs, and tuned
their position to halfway brightness. At |
|
|
16619
|
Mon Jan 24 20:48:48 2022 |
Anchal | Update | BHD | AS4 Input Matrix Diagonalization performed. | I agree. That's an interesting idea.
But does that mean that there is an always
working inverse matrix solution or that any |
|
|
16620
|
Mon Jan 24 21:18:40 2022 |
Paco | Summary | BHD | Part IX of BHR upgrade - AS1 placed and OSEM tuned | [Paco]
AS1 was installed in the ITMY chamber
today. For this I moved AS4 to its nominal |
|
|
16621
|
Tue Jan 25 10:55:02 2022 |
Anchal | Summary | BHD | Part VIII of BHR upgrade - LO2 input matrix diagonalization performed. | The free swinging test was successful.
I ran the input matrix diagonalization code
(/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py) |
|
|
16622
|
Tue Jan 25 11:02:54 2022 |
Anchal | Summary | BHD | Part IX of BHR upgrade - AS1 free swing test failed | For some reasonf the free swing test showed
only one resonance peak (see attachment 1).
This probably happened because one of the |
|
|
16623
|
Tue Jan 25 16:42:03 2022 |
Anchal | Summary | BHD | Reduced filter gains in all damped new SOS | I noticed that our current suspension damping
loops for the new SOS were railing the DAC
outputs. The reason being that cts2um module |
|
|
16624
|
Tue Jan 25 18:37:12 2022 |
TYehonathan | Update | BHD | PR2 Suspension | PR2's side magnet height was adjusted
and its roll was balanced (attachment 1,2).
I verified that the OpLev beam is still aligned. |
|
|
16625
|
Thu Jan 27 08:27:34 2022 |
Paco | Summary | BHD | Part IX of BHR upgrade - AS1 inspection and correction | [Paco]
This morning, I went into ITMY
chamber to inspect AS1 after the free swinging |
|
|
16627
|
Thu Jan 27 17:57:35 2022 |
Anchal | Summary | BHD | Part III of BHR upgrade - Replaced small suspended PR3 with new SOS PR3 and OSEM tuning | [Anchal, Paco]
We removed the old PR3 housed in
a tip-tilt style suspension and put it on |
|
|
16628
|
Thu Jan 27 18:03:36 2022 |
Paco | Summary | BHD | Part III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning | [Paco, Anchal, Tega]
After installing the short OSEMs
into PR2, we moved it into ITMX Chamber. |
|