| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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
|
|
|
15573
|
Tue Sep 15 17:19:09 2020 |
gautam | Update | IOO | MC F spectrum | There was an abrupt change in the MC_F
spectrum between August
4 and August |
|
|
15574
|
Tue Sep 15 19:17:30 2020 |
rana | Update | IOO | MC F spectrum | that's a very curious disconnection
the "Pentek" whitening
board that carries the MC channels has jumpers |
|
|
15575
|
Tue Sep 15 22:11:52 2020 |
gautam | Update | BHD | More notes on the RF44 scheme | Summary:
After more trials, I |
|
|
15576
|
Wed Sep 16 09:43:41 2020 |
gautam | Update | IOO | MC F spectrum | This
elog suggests that there is uniformly
1 stage engaged across all channels. I didn't |
|
|
15577
|
Wed Sep 16 12:03:07 2020 |
Jon | Update | VAC | Replacing pressure gauges | Assembled is the list of dead pressure
gauges. Their locations are also circled
in Attachment 1. |
|
|
15578
|
Wed Sep 16 17:44:27 2020 |
gautam | Update | CDS | All vertex FE models restarted | I had to make a CDS change to the c1lsc
model in an effort to get a few more signals
into the models. Rather than risk requiring |
|
|
15579
|
Fri Sep 18 10:47:48 2020 |
gautam | Update | BHD | Sensing scheme for homodyne phase | eSummary:
I |
|
|
15580
|
Sat Sep 19 01:49:52 2020 |
Koji | Update | General | M4.5 EQ in LA | M4.5 EQ in LA 2020-09-19 06:38:46 (UTC)
/ -1d 23:38:46 (PDT) https://earthquake.usgs.gov/earthquakes/eventpage/ci38695658/executive
I only checked the watchdogs. All |
|
|
15581
|
Sat Sep 19 11:27:04 2020 |
rana | Update | General | M4.5 EQ in LA | the seismometers obviously saturated during
the EQ, but the accelerometers captured some
of it. It looks like there's different |
|
|
15582
|
Sat Sep 19 18:07:35 2020 |
Koji | Update | VAC | TP3 RP failure | I came to the campus and Gautam notified
that he just had received the alert from
the vac watchdog. |
|
|
15583
|
Sat Sep 19 18:08:34 2020 |
rana | Update | General | M4.5 EQ in LA | the EQ was ~14 km south of Caltech and
17 km deep
|
|
|
15584
|
Sat Sep 19 18:46:48 2020 |
Koji | Update | General | Hand soap | I supplied a bottle of hand soap. Don't
put water in the bottle to dilute it as it
makes the soap vulnarable for cotamination. |
|
|
15585
|
Sat Sep 19 19:14:59 2020 |
Koji | Update | General | ITMX released / ETMY UR magnet knocked off | There were two SUSs which didn't look
normal.
- ITMX was easily released by the |
|
|
15586
|
Sat Sep 19 19:37:16 2020 |
not Koji | Update | VAC | TP3 RP failure | Disconcerting because those tip seals were
just replaced [15417].
Maybe they were just defective, but if there |
|
|
15588
|
Sun Sep 20 11:41:54 2020 |
gautam | Update | General | IMC re-locked | While I stopped by the lab this morning
to pick up some things, I took the opportunity
to continue the recovery. |
|
|
15590
|
Mon Sep 21 12:40:58 2020 |
gautam | Update | General | Workable IFO recovery | See Attachment
#1. |
|
|
15591
|
Mon Sep 21 15:57:08 2020 |
Jordan | Update | VAC | TP3 Forepump Replacement and Vac reset | I removed the forepump (Varian SH-110)
for TP3 today to see why it had failed over
the weekend. I tested it in the C&B lab |
|
|
15592
|
Mon Sep 21 16:40:52 2020 |
gautam | Update | PSL | HEPAs are no longer running | The HEPA filters on the PSL enclosure are
no longer running. I tried cycling the power
switch on the NW corner of the enclosure, |
|
|
15595
|
Tue Sep 22 16:29:30 2020 |
Koji | Update | General | Control Room AC setting for continuous running | I came to the lab. The control room AC
was off -> Now it is on.
Here is the setting of the AC meant |
|
|
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 |
|
|
15597
|
Tue Sep 22 23:16:54 2020 |
Koji | Update | General | HEPA Inspection | Gautam reported that the PSL HEPA stopped
running (ELOG
15592). So I came in today and started |
11x |