| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15357
|
Tue May 26 19:19:30 2020 |
Hang | Update | BHD | BHD MM-- effects of astigmatism | Please see the attached doc.
I think the conclusion is that
if the AS1 RoC error is not significantly |
|
|
15363
|
Tue Jun 2 14:05:24 2020 |
Hang | Update | BHD | MM telescope actuation range requirments | We computed the required actuation range
for the telescope design in elog:15357. The result |
|
|
15379
|
Sat Jun 6 14:07:30 2020 |
Jon | Update | BHD | Stock-Part Mode-Matching Telescope Option | Summary
For the initial phase of
BHD testing, we recently discussed whether
the mode-matching telescopes could be built |
|
|
15380
|
Mon Jun 8 11:50:02 2020 |
Hang | Update | BHD | Astigmatism and scattering plots | We consider the astigmatism effects of
the stock options. The conclusions are:
1. For the AS path, the stock should work |
6x |
|
15381
|
Mon Jun 8 12:49:07 2020 |
Koji | Update | BHD | Astigmatism and scattering plots | Can you describe the mode matching
in terms of the total MM? Is MM_total = sqrt(MM_vert
* MM_horiz)? |
|
|
15382
|
Mon Jun 8 17:40:22 2020 |
Jon | Update | BHD | Astigmatism and scattering plots | MM_total = (MM_vert + MM_horiz) / 2.
The large astigmatic MM loss in
the LO case is mainly due to the strong LO4 |
|
|
15384
|
Mon Jun 8 21:45:47 2020 |
Jon | Update | BHD | Astigmatism and scattering plots | Hmm? T1300364
suggests MM_total = Sqrt(MM_Vert * MM_Horiz) |
|
|
15386
|
Tue Jun 9 14:55:43 2020 |
Jon | Update | BHD | MM telescope actuation range requirments | I don't think we ever discussed why
the angular RMS of the ETMs is so much higher
than the ITMs. Maybe that's a separate |
|
|
15387
|
Tue Jun 9 15:02:56 2020 |
eHang | Update | BHD | Astigmatism and scattering plots | Using the updated AOI's for the LO
path: (4.8, 47.9, 2.9, 4.5) deg for (LO1,
LO2, LO3, LO4), we obtain the following results. |
|
|
15389
|
Thu Jun 11 09:37:38 2020 |
Jon | Update | BHD | Conclusions on Mode-Matching Telescopes | After further astigmatism/tolerance analysis
[ELOG
15380, 15387] |
|
|
15456
|
Mon Jul 6 15:10:40 2020 |
Jon | Summary | BHD | 40m --> A+ BHD design analysis | As suggested last week, Hang and I have
reviewed the A+ BHD status
(DRD, CDD, and reviewers' comments) and |
|
|
15464
|
Thu Jul 9 17:12:52 2020 |
gautam | Update | BHD | In-air BHD | Summary:
We can probably learn something
about the interferometer / top level BHD |
|
|
15479
|
Tue Jul 14 15:29:25 2020 |
gautam | Update | BHD | In-air BHD - DCPD amplifier noise | For the first pass, it's probably easiest
to use the existing DCPD
amplifier. Looking at the gain and noise |
|
|
15483
|
Wed Jul 15 19:11:40 2020 |
gautam | Update | BHD | In-air BHD - alignment into OMC | I forgot about the pointing - probably
we will need another actuator to control
the pointing of the AS beam onto the DCPDs. |
|
|
Draft
|
Wed Jul 15 19:17:09 2020 |
gautam | Update | BHD | In-air BHD - alignment into OMC | You can activate all 3axis
|
|
|
15489
|
Thu Jul 16 01:12:22 2020 |
gautam | Update | BHD | In-air BHD - preparing the LO path | Attachment
#1 - The 80mW pickoff |
|
|
15493
|
Sun Jul 19 15:40:15 2020 |
gautam | Update | BHD | In-air BHD - CDS and wiring summary | Attachment
#1 shows the proposed |
|
|
15495
|
Mon Jul 20 17:55:15 2020 |
gautam | Update | BHD | In-air BHD - preparing the LO path | The LO pickoff has been coupled into a
fiber with ~90% MM (8 mW / 9 mW input). While
I wait for the DCPD electronics to be found |
|
|
15497
|
Tue Jul 21 00:30:24 2020 |
gautam | Update | BHD | In-air BHD - LO RIN | Attachment
#1 shows the RIN of |
|
|
15498
|
Tue Jul 21 16:41:46 2020 |
gautam | Update | BHD | PMC assembly space | I decided to use the old EY auxiliary optics
table, which is now stored along the east
arm about 10 m from the end, as a workspace |
|
|
15503
|
Tue Jul 28 13:55:11 2020 |
Hang | Update | BHD | Exploring bilinear SRCL->DARM coupling | We explore bilinear SRCL to DARM noise
coupling mechanisms, and show two cases that
by doing BHD readout the noise performance |
|
|
15505
|
Wed Jul 29 11:57:59 2020 |
rana | Update | BHD | In-air BHD - CDS and wiring summary | 3. I agree - this whitening will be handy
to have for diagnostics.
4. I think in principle, we can |
|
|
15507
|
Thu Aug 6 00:34:38 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I've pushed an MCMC simulation to the
A+ BHD repo (filename MCMC_TFs.ipynb). The
idea is to show how random offsets around |
8x |
|
15509
|
Fri Aug 7 11:23:47 2020 |
rana | Update | BHD | Monte Carlo Simulations | that's great. I think we would like
to figure out how to present this so that
its clear what the distribution of TFs is. |
|
|
15512
|
Mon Aug 10 07:13:00 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I fixed some stuff in the MCMC simulation:
1. Results are now plotted as shades
from minimum to maximum. I tried making the |
8x |
|
15513
|
Mon Aug 10 16:52:04 2020 |
gautam | Update | BHD | Workable setup prepared | All the details are in E2000436,
and documents linked from there, I think
an elog would be much too verbose. In summary, |
|
|
15514
|
Tue Aug 11 23:20:29 2020 |
gautam | Update | BHD | Some first tests with air BHD setup | Some tests done today:
All of these tests were done with
the PRMI locked with carrier resonant in |
|
|
15532
|
Mon Aug 17 23:41:50 2020 |
gautam | Update | BHD | Whitening and air BHD dark noise | Summary:
With the chosen transimpedance
of 300 ohms, in order to be able to see the |
|
|
15535
|
Fri Aug 21 15:27:00 2020 |
gautam | Update | BHD | Better BHD mode-matching | Summary:
The mode-matching between the LO
and AS beams is now ~50%. |
|
|
15539
|
Tue Aug 25 05:51:29 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I re-plotted the MCMC results as semi-transparent
lines so that probable lines stick out.
This also reveals what is behind |
8x |
|
15540
|
Wed Aug 26 00:52:55 2020 |
gautam | Update | BHD | BHD activities | Listing some talking points from the last
week of activity here.
|
|
|
15545
|
Fri Aug 28 23:33:38 2020 |
gautam | Update | BHD | Some more hardware changes | Just a quick set of notes detailing changes
so that there are no surprises, more details
to follow. |
|
|
15549
|
Sat Aug 29 22:46:29 2020 |
gautam | Update | BHD | New homodyne-phase control electronics | Summary:
The electronics chain used to drive
the three elements of the PI PZT on which |
|
|
15553
|
Wed Sep 2 00:49:47 2020 |
gautam | Update | BHD | Some notes about homodyne phase | Summary:
Using a heterodyne measurement
setup to track both quadratures, I estimated |
|
|
15554
|
Thu Sep 3 00:00:57 2020 |
gautam | Update | BHD | New patch cable installed |
10m PM1064 cable was installed.
I tried a double shielding approach (photos
tmrw here), |
|
|
15555
|
Thu Sep 3 15:55:04 2020 |
gautam | Update | BHD | Phase drift between LO and IFO after fiber replacement | Summary:
After replacement of the fiber
delivering the LO beam to the airBHD setup |
|
|
15562
|
Mon Sep 7 23:49:14 2020 |
gautam | Update | BHD | A first look at RF44 scheme | Summary:
Over the last couple of days, I've
been working towards getting the infrastructure |
|
|
15563
|
Tue Sep 8 01:31:43 2020 |
Koji | Update | BHD | A first look at RF44 scheme | - Loose fiber coupler: Sorry about that.
I could not detect something was loose there,
although some of the locks were not tightened. |
|
|
15565
|
Wed Sep 9 00:05:18 2020 |
gautam | Update | BHD | More notes on the RF44 scheme | Summary:
With the Michelson locked
on a dark fringe, the f2-f1 signal at ~44 |
|
|
15567
|
Thu Sep 10 15:43:22 2020 |
Jon | Update | BHD | Input noise spectra for A+ BHD modeling | As promised some time ago, I've
obtained input noise spectra from the sites calibrated
to physical units. They are located in a |
|
|
15569
|
Mon Sep 14 07:50:01 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | Turns out what was causing the instability
in the aLIGO plots were the lock
commands which I forgot to remove before |
10x |
|
15575
|
Tue Sep 15 22:11:52 2020 |
gautam | Update | BHD | More notes on the RF44 scheme | Summary:
After more trials, I |
|
|
15579
|
Fri Sep 18 10:47:48 2020 |
gautam | Update | BHD | Sensing scheme for homodyne phase | eSummary:
I |
|
|
15596
|
Tue Sep 22 22:38:11 2020 |
gautam | Update | BHD | Sensing scheme for homodyne phase - some analytic calcs | I got some feedback from Koji who pointed
out that the phase tracker is not required
here. This situation is similar to the phase |
|
|
15611
|
Mon Oct 5 00:37:19 2020 |
gautam | Update | BHD | Single bounce interferometer locked | Summary:
The simple interferometer, composed
of a single bounce reflection from ITMY and |
|
|
15612
|
Mon Oct 5 00:53:16 2020 |
Koji | Update | BHD | Single bounce interferometer locked | 🤘🤘🤘
|
|
|
15623
|
Tue Oct 13 11:13:54 2020 |
gautam | Update | BHD | Investigation into RF44 sensing | Attachment
#1: spectra of the |
|
|
15628
|
Thu Oct 15 10:42:39 2020 |
gautam | Update | BHD | More investigation into RF44 sensing | Summary of discussion between
Koji and gautam on 14 Oct:
Koji questioned the accuracy |
|
|
15631
|
Fri Oct 16 09:16:37 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | Pushed another update to MCMC simulation.
This includes:
Added new imbalances: ITM |
8x |
|
15637
|
Thu Oct 22 11:48:08 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I found this H1 alog entry
by Izumi confirming that the calibrated channels
CAL-CS_* need the same dewhitening filter. |
8x |