| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
17461
|
Mon Feb 13 11:54:54 2023 |
yuta | Summary | BHD | 60 Hz frequency noise is coming from MC1 coils | [JC, Yuta]
We have found that MC1 coils are causing |
|
|
17462
|
Mon Feb 13 17:35:20 2023 |
Anchal | Summary | BHD | 60 Hz frequency noise is coming from MC1 coils | [Anchal, Yuta]
We think we have narrowed
down the source of 60 Hz noise to one fo |
|
|
17463
|
Tue Feb 14 10:49:04 2023 |
yuta | Summary | BHD | MC1 electronics diagram and cable diconnection tests | Below are summary of electronics around
MC1 and cable disconnection tests.
These suggest that the 60 Hz noise |
|
|
17466
|
Wed Feb 15 16:16:59 2023 |
Anchal | Summary | BHD | IMC optics Coil Output Filter corrections | Overtime the coil output filters on IMC
optics have drifted into a bad configuration.
Today at the meeting, Rana told us the correct |
|
|
17468
|
Thu Feb 16 14:44:06 2023 |
yuta | Update | BHD | FPMI BHD with BH55 recovered | FPMI BHD with LO phase locked using BH55
is recovered after 60 Hz frequency noise
saga. |
|
|
17476
|
Wed Feb 22 17:32:16 2023 |
yuta | Update | BHD | BH55 and BH44 both amplified | Since we need more signal for both BH55
and BH44 to compare LO phase locking scheme,
BH55 and BH44 RF outputs are now amplified |
|
|
17478
|
Thu Feb 23 14:55:49 2023 |
yuta | Update | BHD | BH55 and BH44 orthogonality checks | Ideally, BH55 and BH44 should give orthogonal
signals to lock LO phase (40m/17302).
This was checked with various interferometer |
|
|
17491
|
Fri Mar 3 18:47:13 2023 |
Paco | Summary | BHD | LO phase POS noise coupling - I | I tried some LO PHASE noise coupling measurements
today. With MICH locked using AS55_Q, I control
the LO phase using the single RF (BH55_Q) |
|
|
17506
|
Mon Mar 13 19:53:36 2023 |
yuta | Update | BHD | FPMI BHD sensing matrix measurement with individual lines | FPMI BHD sensing matrix was measured by
an updated method with updated RF demodulation
phases for REFL55 and AS55. |
|
|
17511
|
Tue Mar 14 18:44:39 2023 |
yuta | Update | BHD | LO phase noise measurements in ITMX single bounce, MICH and FPMI | [Anchal, Yuta]
We have measured LO phase noise in |
|
|
17514
|
Mon Mar 20 20:27:30 2023 |
yuta | Update | BHD | LO phase noise contribution in MICH BHD | [Paco, Yuta]
MICH was locked with balanced homodyne
readout with LO phase locked using BH55_Q |
|
|
17517
|
Wed Mar 22 18:38:54 2023 |
Paco | Summary | BHD | "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" | [Paco, Yehonathan]
I took over the finesse calculations
Yehonathan had set up for BHD. The notebook |
|
|
17518
|
Thu Mar 23 14:20:29 2023 |
Koji | Summary | BHD | "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" | This is interesting. With the FPMI, the
DARM phase shift is enhanced by the cavity.
Therefore, I suppose the effect on the BH55 |
|
|
17525
|
Mon Mar 27 20:28:57 2023 |
Paco | Summary | BHD | "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" | Yuta pointed out that the BH55 signal was
weirdly never going to zero, so I actually
tuned the demod angle and made sure I was |
|
|
17526
|
Tue Mar 28 10:58:03 2023 |
rana | Summary | BHD | "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" | but what about including the DC reflectivity
imbalance of the arms? there would be another
BH55 term from that field maybe. |
|
|
17528
|
Wed Mar 29 16:36:04 2023 |
Paco | Summary | BHD | "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" | I repeated the calculations but with FPMI
(last
case was all MICH). The qualitative behavior |
|
|
17547
|
Tue Apr 18 19:29:43 2023 |
yuta | Update | BHD | LO phase noise measurements in ITMX single bounce, MICH and FPMI | [Anchal, Yuta]
We have repeated LO phase noise measurement |
|
|
17549
|
Wed Apr 19 11:35:20 2023 |
Yehonathan | Update | BHD | PRMI estimated noise budget | First, simple stuff. We estimate the noise
budget with total input and output noises.
Later, we will break it down (ADC, DAC, whitening, |
|
|
17560
|
Mon Apr 24 19:11:20 2023 |
Koji | Summary | BHD | LO/MI(DARM) signal strength comparison between the configurations | Yuta and I had a discussion last week about
the signal strength between the configurations.
Here are some naive calculations. |
|
|
17563
|
Tue Apr 25 21:21:03 2023 |
Yehonathan | Update | BHD | Dewhitening noises | {Mayank, Paco, Yehonathan}
Dewhitening noise curves were taken
using SR785+SR560 for the PRMI noise budget. |
|
|
17564
|
Wed Apr 26 09:37:10 2023 |
Paco | Update | BHD | IQ demod board gains for REFL11 and AS55 | We
measured the IQ demodulation board gains
for REFL11 and AS55. |
|
|
17565
|
Wed Apr 26 11:27:49 2023 |
Paco | Summary | BHD | LO/MI(DARM) signal strength comparison between the configurations with finesse | I'm
checking Koji + Yuta's not-so-naive calculations
using finesse. |
|
|
17567
|
Wed Apr 26 12:59:42 2023 |
Yehonathan | Update | BHD | Updated noise budget with output electronics | I included the output electronic noises
into the PRMI carrier noise budget (attachment
1). |
|
|
17570
|
Fri Apr 28 18:40:49 2023 |
Yehonathan | Update | BHD | Updated noise budget with some input electronic noises | {Mayank, Yehonathan}
Yesterday, we measured AS55 and
REFL11 dark noises at the IQ demod boards |
|
|
17579
|
Wed May 3 12:11:52 2023 |
Yehonathan | Update | BHD | Updated noise budget with measured noise and OLTF | {Paco, Yehonathan, Yuta}
Paco and Yuta locked PRMI carrier
and I took the MICH OLTF measurement (attachment |
|
|
17582
|
Wed May 3 18:40:50 2023 |
Yehonathan | Update | BHD | Whitening noises measurements | {Mayank, Yehonathan}
We measured the noise at the WF1
(REFL11) and WF2 (AS55) boards at the LSC |
|
|
17584
|
Mon May 8 17:05:30 2023 |
Yehonathan | Update | BHD | Whitening TF measurements | {Mayank, Yehonathan}
We measured today the TFs of the
whitening boards. We measured in particular |
|
|
17585
|
Tue May 9 11:32:04 2023 |
Yehonathan | Update | BHD | Whitening TF measurements | We forgot to take a reference TF measurement
by looping the SR785 on itself using the
same BNC cables used for the actual measurement. |
|
|
17588
|
Wed May 10 11:49:34 2023 |
Yehonathan | Update | BHD | Updated PRMI AS55+REFL11 noise budget | I
added input noises and angle to length coupling
to the noise budget. |
|
|
17590
|
Thu May 11 12:05:24 2023 |
rana | Update | BHD | Updated PRMI AS55+REFL11 noise budget | Is the A2L coming from the optical lever
feedback? If so, we can make a 30 Hz ELP
to cut it off by 60 Hz. |
|
|
17600
|
Wed May 24 13:19:28 2023 |
Paco | Update | BHD | BH44 and BH55 dc transimpedance modified | We lowered the BH44
and BH55 DC transimpedances to ~ 50 V/A |
|
|
17601
|
Wed May 24 17:36:25 2023 |
Paco | Update | BHD | BH44_I content and PRC alignment | BH44
is sensitive to PRC alignment noise
[Paco, Yuta] |
|
|
17607
|
Wed May 31 10:23:40 2023 |
Yehonathan | Update | BHD | Sensing matrix model | I calculated the sensing matrix for PRMI
carrier using the Finesse model (git updated)
using MAXTEM=2. PRG is calculated to be 11.14, |
|
|
17608
|
Wed May 31 12:08:07 2023 |
rana | Update | BHD | Sensing matrix model | it is great to see a sensing
matrix without 900 digits of precision! |
|
|
17673
|
Fri Jul 7 20:34:43 2023 |
Hiroki | Summary | BHD | BHD alignment has been restored | [Yuta, Hiroki]
BHD
alignment has been restored
We |
|
|
17703
|
Thu Jul 20 17:28:03 2023 |
Koji | Update | BHD | BHD Platform OMC cables | Dean made the OMC cables for the BHD Platform.
They are going through the C&B process.
From left to right: QPD cable, |
|
|
17715
|
Wed Jul 26 00:30:16 2023 |
Hiroki | Update | BHD | Mode-matching breadboard for BHD OMCs | Currently, I'm constructing the mode-matching
telescope on a breadboard for the alignment
of two OMCs for BHD. |
|
|
17722
|
Thu Jul 27 03:39:57 2023 |
Hiroki | Update | BHD | Mode-matching breadboard for BHD OMCs | I almost finished constructing the mode-matching
breadboard today.
What I did on July 26th: |
|
|
17732
|
Fri Jul 28 22:43:26 2023 |
JC | Update | BHD | BHD Platform Preparation. | BHD Platform
has been washed and set to dry over the weekend
Yesterday, I began |
|
|
17735
|
Mon Jul 31 15:34:56 2023 |
JC | Update | BHD | BHD Platform Preparation. | [Maty, JC]
This morning, Maty and I proceeded
to work on the BHD Platform work. We rinsed |
|
|
17737
|
Mon Jul 31 16:04:54 2023 |
JC | Update | BHD | BHD Platform Preparation. | [JC]
I began to prepare the temporary clean
room where we will be putting together the |
|
|
17739
|
Tue Aug 1 02:51:46 2023 |
Hiroki | Summary | BHD | Mode-matching breadboard for BHD OMCs | Mode-matching
breadboard has been constructed
I
have constructed the mode-matching breadboard |
|
|
17745
|
Wed Aug 2 10:33:53 2023 |
JC | Update | BHD | BHD Platform Preparation. | BHD platform is estimated to stop baking
by the end of the day. We are following the
LIGO Procedure and baking at 150°C By |
|
|
17807
|
Thu Aug 24 02:54:19 2023 |
Koji | Update | BHD | OMC Interface Aligner / BHD OFI arrangement | OMC Interface Aligner - (It's upside
down...)
BHD OFI arrangement |
|
|
17811
|
Fri Aug 25 20:27:33 2023 |
Koji | Update | BHD | OMC Interface Aligner | A bit improved the design of OMC Interface
Aligner
The idea is...The OMC I/F aligner |
|
|
17814
|
Tue Aug 29 02:02:51 2023 |
Koji | Update | BHD | BHD Prep Status | Ready / Soon Ready
- BHD OMC Cables ready
- OMC#1 / OMC#4 ready |
|
|
17884
|
Wed Oct 4 17:28:48 2023 |
Koji | Summary | BHD | Balance Mass Layout | I went to the Solidworks model of the ITMY
invac table and checked where the center
of mass is. |
|
|
17885
|
Wed Oct 4 19:33:23 2023 |
Koji | Update | BHD | The optical fiber for the BHD/OMC assembly long enough | The optical fiber that Hiroki set up turned
out that long enough for the use in the new
HEPA optical bench. (Attachment 1) |
|
|
17887
|
Thu Oct 5 23:32:47 2023 |
Koji | Update | BHD | Posts used for the BHD OFI | The BHD OFI path consists of a few optical
components: (Attachment 1)
HWP ROtator
Thin |
6x |
|
17888
|
Fri Oct 6 13:51:15 2023 |
JC | Update | BHD | Posts used for the BHD OFI | Not a fanatic of the |
|