| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15228
|
Wed Feb 26 22:09:52 2020 |
gautam | Summary | BHD | Projected IFO noise budget, post-BHD upgrade | The quantum noise curves here are not correct.
c.f. amplitude quadrature noise
budget. |
|
|
15241
|
Mon Mar 2 23:49:03 2020 |
Jon | Summary | BHD | Projected IFO noise budget, post-BHD upgrade | Updated noise budget curves, now computed
using the latest version of pygwinc. This
resolves the inconsistency between the gwinc |
|
|
15244
|
Tue Mar 3 18:11:05 2020 |
Jon | Summary | BHD | Projected IFO noise budget, post-BHD upgrade | Revised noise estimates, correcting a couple
of factor of 2 and factor of pi errors found
in the coil driver noise calculation. Also |
|
|
15267
|
Wed Mar 11 21:03:57 2020 |
Koji | Update | BHD | SOS packages from Syracuse | I opened the packages send from Syracuse.
- The components are not vacuum
clean. We need C&B. |
|
|
15284
|
Thu Mar 26 17:41:18 2020 |
Jon | Omnistructure | BHD | BHD docs compilation | Since there has been a proliferation of
BHD Google docs recently, I've linked
them all from the BHD |
|
|
15295
|
Fri Apr 3 13:40:07 2020 |
Jon | Update | BHD | BHD front-end complication | I wanted to pass along a complication pointed
out by K. Thorne re: our plan to use Gen1
(old) Dolphin IPC cards in the new real-time |
|
|
15299
|
Tue Apr 7 10:56:39 2020 |
Jon | Update | BHD | BHD front-end complication |
Quote:
|
|
|
15305
|
Thu Apr 16 21:13:20 2020 |
Jon | Update | BHD | BHD optics specifications | Summary
I've generated
specifications for the new BHD optics. This
includes the suspended relay mirrors as |
|
|
15322
|
Fri May 8 14:27:25 2020 |
Hang | Update | BHD | New SRC gouy phase | [Jon, Hang]
After updating the 40 m finesse
file to incorporate the new SRC length (and |
|
|
15334
|
Fri May 15 09:18:04 2020 |
Jon | Update | BHD | BHD telescope designs accounting for ASC | Hang and I have reanalyzed the BHD telescope
designs, with the goal of identifying
sufficiently non-degenerate locations for |
|
|
15336
|
Mon May 18 18:00:16 2020 |
Hang | Update | BHD | BHD mode-matching study | [Jon, Tega, Hang]
We proposed a few BHD mode-matching telescope
designs and then preformed a few monte-carlo |
|
|
15337
|
Tue May 19 15:24:06 2020 |
rana | Update | BHD | BHD mode-matching study | It would be good to have a corner
plot with all the distances/ RoCs. Also
perhaps a Jacobian |
|
|
15339
|
Wed May 20 18:45:22 2020 |
Hang | Update | BHD | BHD mode-matching study--corner plot & adjustment requirement | As Rana suggested, we present the
scattering plot of the AS path
mode matching for various variables. |
|
|
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 |
|