| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15500
|
Fri Jul 24 15:40:59 2020 |
Jordan | Update | VAC | Installation of two new UPS units | I installed the Tripp
Lite SMX1000RT2U and Tripp
Lite Smart1000LCD at the |
|
|
15502
|
Tue Jul 28 12:22:40 2020 |
Jon | Update | VAC | Vac interlock test today 1:30 pm | This afternoon Jordan is going to carry
out a test of the V4 and V5 hardware
interlocks. To inform the interlock improvement |
|
|
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 |
|
|
15504
|
Tue Jul 28 14:11:14 2020 |
Jon | Update | VAC | Vac interlock test today 1:30 pm | This test has been completed. The IFO configuration
has been reverted to nominal.
For future reference: yes, |
|
|
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 |
|
|
15506
|
Thu Jul 30 16:16:43 2020 |
gautam | Update | SUS | Suspension recovery | This
earthquake and friends had tripped all
watchdogs. I used the scripted watchdog re-enabler, |
|
|
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 |
|
15508
|
Thu Aug 6 22:57:20 2020 |
gautam | Update | safety | New live HV Supplies | Be aware that there is now a KEPCO HV supply
that is energized, sitting on the floor immediately
adjacent to the OMC rack, east of the AP |
|
|
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 |
|
|
15515
|
Wed Aug 12 17:36:42 2020 |
gautam | Update | CDS | Timing distribution slot availability | See Attachment
#1. J8 was connected |
|
|
15516
|
Wed Aug 12 17:42:58 2020 |
gautam | Update | Electronics | Photodiode inventory | See Attachments
#1 and #2. |
|
|
15517
|
Wed Aug 12 18:08:54 2020 |
gautam | Update | Electronics | Number of the beast | The "source"
output of the SR785 has a DC offset of -6.66 |
|
|
15518
|
Wed Aug 12 20:14:06 2020 |
Koji | Update | CDS | Timing distribution slot availability | I believe we will use two new chassis at
most. We'll replace c1ioo from Sun to
Supermicro, but we recycle the existing timing |
|
|
15519
|
Wed Aug 12 20:15:42 2020 |
Koji | Update | Electronics | Number of the beast | Grrr. Let's repair the unit. Let's
get a help from Chub & Jordan.
Do you have a second unit in the |
|
|
15520
|
Wed Aug 12 20:16:52 2020 |
Koji | Update | Electronics | Photodiode inventory | When I tested Q3000 for aLIGO, the failure
rate was pretty high. Let's get 10pcs. |
|
|
15521
|
Thu Aug 13 11:30:19 2020 |
gautam | Update | CDS | Timing distribution slot availability | That's great. I wonder if we can also
get away with not adding new Dolphin infrastructure.
I'd really like to avoid changing any |
|
|
15522
|
Thu Aug 13 13:35:13 2020 |
Koji | Update | CDS | Timing distribution slot availability | The new dolphin eventually helps us. But
the installation is an invasive change to
the existing system and should be done at |
|
|
15523
|
Thu Aug 13 18:10:22 2020 |
gautam | Update | General | Power outage | There was a power outage ~30 mins ago that
knocked out CDS, PSL etc. The lights in the
office area also flickered briefly. Working |
|
|
15524
|
Fri Aug 14 00:01:55 2020 |
gautam | Update | CDS | BHD / OMC model channels now added to autoburt | I added the EPCIS channels for the c1omc
model (gains, matrix elements etc) to the
autoburt such that we have a record of these, |
|
|
15525
|
Fri Aug 14 10:03:37 2020 |
Jon | Update | CDS | Timing distribution slot availability | That's great news we
won't have to worry about a new timing
fanout for the two new machines, c1bhd and |
|
|
15529
|
Mon Aug 17 15:18:26 2020 |
gautam | Update | Equipment loan | Beam Profiler + peripherals --> 40m | Gabriele left the DataRay beam profiler
+ peripherals (see Attachment |
|
|
15530
|
Mon Aug 17 21:24:43 2020 |
gautam | Update | General | Fire extinguisher inspection | A technician came to the lab today at ~4pm.
He entered the VEA (with booties and googles),
and also the clean and bake lab. The whole |
|
|
15531
|
Mon Aug 17 23:36:10 2020 |
gautam | Update | ALS | Whitening and ALS noise | I finally managed to
install a differential-receiving whitening
board in 1Y2 - 4 channels are available at |
|
|
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 |
|
|
15533
|
Tue Aug 18 13:55:23 2020 |
rana | Update | ALS | Whitening and ALS noise | No, there should be no unscheduled visits
from any inspector, marshal, tech, or vendor.
They all have to be escorted or they don't |
|
|
15534
|
Thu Aug 20 00:21:51 2020 |
gautam | Update | Electronics | First look at HV coil driver | Summary:
A single channel of this
board was stuffed (and other channels |
|
|
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%. |
|
|
15536
|
Sun Aug 23 23:36:58 2020 |
gautam | Update | Electronics | First look at HV coil driver | Summary:
A more careful analysis has revealed
some stability problems. |
|
|
15537
|
Mon Aug 24 08:13:56 2020 |
Jon | Update | VAC | UPS installation | I'm in the lab this morning to interface
the two new UPS units with the digital controls
system. Will be out by lunchtime. The disruptions |
|
|
15538
|
Mon Aug 24 11:25:07 2020 |
Jon | Update | VAC | UPS installation | I'm leaving the lab shortly. We're
not ready to switch over the vac equipment
to the new UPS units yet. |
|
|
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.
|
|
|
15541
|
Wed Aug 26 15:48:31 2020 |
gautam | Update | VAC | Control screen left open on vacuum workstation | I found that the control MEDM screen was
left open on the c1vac workstation. This
should be closed every time you leave the |
|
|
15542
|
Wed Aug 26 16:12:25 2020 |
gautam | Update | Electronics | Test mass coil current requirements | Attachment
#1 is a summary of |
|
|
15543
|
Wed Aug 26 22:49:47 2020 |
gautam | Update | Electronics | Checkout of Trek Model 603 | I unboxed
the Trek amplifier today, and performed some
basic tests of the functionality. It seems |
|
|
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. |
|
|
15546
|
Sat Aug 29 18:52:42 2020 |
rana | Update | IOO | IMC gain change | I lowered
the (FAST) PZT gain on the IMC/FSS servo
today. |
|
|
15547
|
Sat Aug 29 20:07:48 2020 |
rana | Update | Electronics | WFS characterization | I set up to do the WFS head modifications
today, but I was shot down in flames due
to a missing AC/DC adapter. |
|
|
15548
|
Sat Aug 29 22:10:09 2020 |
gautam | Update | Electronics | WFS characterization | Clearly this "riff raff" is referring
to me. It won't help today I guess but
there is one each on the carts holding the |
|
|
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 |
|
|
15550
|
Sun Aug 30 11:29:33 2020 |
rana | Update | General | power blink? | My power at home winked out for a second
this morning, but it looks like either nothing
happened in the 40m lab or else it rode it |
|
|
15551
|
Tue Sep 1 01:49:49 2020 |
Koji | Update | Electronics | Teledyne AP1053 etc were transported | Teledyne AP1053 etc were transported from
Rich's office to the 40m. The box is
placed on the shelf at the entrance. |
|
|
15552
|
Tue Sep 1 15:39:04 2020 |
gautam | Update | Electronics | HV coil driver oscillations fixed | Summary:
Increasing the compensation capacitance
(470 pF now instead of 33 pF) seems to have |
|
|
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 |
|
|
15556
|
Fri Sep 4 15:26:55 2020 |
Jon | Update | VAC | Vac system UPS installation | The vac controls are going down now to
pull and test software changes. Will advise
when the work is completed. |
|