| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15485
|
Wed Jul 15 19:23:44 2020 |
gautam | Update | General | Emergency light on in control room | The emergency lamps above the exit sign
on the NW entrance to the control room are
on. I tried opening and closing the door, |
|
|
15487
|
Wed Jul 15 20:58:40 2020 |
gautam | Update | General | Emergency light on in control room | True - it is now not on anymore.
|
|
|
15488
|
Wed Jul 15 21:08:43 2020 |
gautam | Update | Electronics | ETM coil outputs DQed | To facilitate this investigation, I've
DQed the 4 face coil outputs for the two
ETMs. EX is currently running with 5 times |
|
|
15489
|
Thu Jul 16 01:12:22 2020 |
gautam | Update | BHD | In-air BHD - preparing the LO path | Attachment
#1 - The 80mW pickoff |
|
|
15490
|
Thu Jul 16 14:41:22 2020 |
gautam | Update | General | Fire extinguisher inspection | The (masked) tech accessed all areas in
the lab (office area, control room, VEA)
between ~230pm-3pm. The laser safety goggles |
|
|
15491
|
Fri Jul 17 00:18:13 2020 |
gautam | Update | General | Locking updat |
I found that an EPICS channel wasn't
reset to the correct value by burtrestore
after the FE bootfest yesterday.
This |
|
|
15493
|
Sun Jul 19 15:40:15 2020 |
gautam | Update | BHD | In-air BHD - CDS and wiring summary | Attachment
#1 shows the proposed |
|
|
15494
|
Mon Jul 20 17:23:46 2020 |
gautam | Update | Electronics | Coil drivers for the test masses | Summary:
Looking at the signals to the test
mass coils, it seems borderline |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
15544
|
Fri Aug 28 11:41:23 2020 |
gautam | Bureaucracy | safety | Crane inspection 2020 | Mr Fred Goodbar of Konacrane was in the
lab 830am-1130am today. All three cranes
in the VEA were inspected, loaded with 450lb |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|