| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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. |
|
|
15557
|
Fri Sep 4 21:12:51 2020 |
Jon | Update | VAC | Vac system UPS installation | The vac work is completed. All of the vacuum
equipment is now running on the new 120V
UPS, except for TP1. The 230V TP1 is still |
|
|
15558
|
Sat Sep 5 12:01:10 2020 |
Jon | Update | VAC | Vac system UPS installation | Summary
Yesterday's UPS
switchover was mostly a success. The new
Tripp |
|
|
15559
|
Sat Sep 5 14:28:03 2020 |
Koji | Update | General | LO beam: Fiber coupling work | 2PM: Arrived at the 40m. Started the work
for the coupling of the RF modulated LO beam
into a fiber. -> I left the lab |
|
|
15560
|
Sun Sep 6 13:15:44 2020 |
Jon | Update | DAQ | UPS for framebuilder | Now that the old APC
Smart-UPS 2200 is no longer in use by
the vacuum system, I looked into whether |
|
|
15561
|
Sun Sep 6 14:17:18 2020 |
Jon | Update | Equipment loan | Zurich Instruments analyzer | On Friday, I grabbed the Zurich Instruments
HF2LI lock-in amplifier and brought
it home. As time permits, I will work towards |
|
|
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. |
|
|
15564
|
Tue Sep 8 11:49:04 2020 |
gautam | Update | CDS | Some path changes | I edited /diskless/root.jessie/home/controls/.bashrc
so that I don't have to keep doing this |
|
|
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 |
|
|
15568
|
Thu Sep 10 15:56:08 2020 |
Koji | Update | General | HEPA & Particle Level Status | 15:30
- PSL HEPA was running
at 33% and |
|
|
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 |
|
15570
|
Tue Sep 15 10:57:30 2020 |
gautam | Update | PSL | PMC re-locked, RGA re-enabled | The PMC has been unlocked since September
11 sometime (summary pages are flaky again).
I re-locked it just now. I didn't mess |
|
|
15571
|
Tue Sep 15 12:20:36 2020 |
gautam | Update | Electronics | SR785 repaired | The unit was repaired and returned to the
40m. Now, with a DMM, I measure a DC offset
value that is ~1% of the AC signal amplitude. |
|
|
15572
|
Tue Sep 15 17:04:43 2020 |
gautam | Update | Electronics | DC adaptors delivered | These were delivered to the 40m today and
are on Rana's desk
|
|