| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14528
|
Tue Apr 9 19:07:12 2019 |
gautam | Update | ALS | IR ALS noise budget | Updated the noise budget to include the
unsuppressed frequency noise from the EX
laser. It does not explain the noise |
|
|
14529
|
Wed Apr 10 00:33:09 2019 |
Anjali | Update | Frequency noise measurement | Frequency noise measurement of 1 micron source |
Attachement #1 shows the input
(ch4-green) modulation frequency and
the photodiode output (ch1-yellow) when the |
|
|
14530
|
Wed Apr 10 16:58:54 2019 |
rana | Update | IOO | fiber MZ for NPRO freq noise measurements | Can we get some panel
mount FC/APC connectors and put them on a |
|
|
14531
|
Wed Apr 10 22:59:22 2019 |
gautam | Update | IOO | Spooled fiber | Steve had showed me some stock of long
fibers a while back - they are from Oz Optics,
and are 50m long, and are already spooled |
|
|
14532
|
Wed Apr 10 23:37:59 2019 |
gautam | Update | PSL | PSL fan is noisy | Attached is my phone recording of what
it sounds like right now in the PSL enclosure
- not good for frequency noise measurement! |
|
|
14533
|
Thu Apr 11 01:10:05 2019 |
gautam | Update | ALS | Large 2kHz peak (and harmonics) in ALS X | These weren't present last week. The
peaks are present in the EX PDH error monitor
signal, and so are presumably connected with |
|
|
14534
|
Thu Apr 11 09:05:06 2019 |
Anjali | Update | IOO | Spooled fiber |
Attchment #1,2,3 and 4 shows the
results with frequency modulation of 32 Hz,
140 Hz , 300 Hz and without frequency modulation. |
|
|
14535
|
Thu Apr 11 11:42:10 2019 |
Koji | Update | PSL | PSL fan is noisy | This thread: ELOG
10295
My interpretation of these ELOGs |
|
|
14536
|
Thu Apr 11 12:04:43 2019 |
Jon | Update | SUS | Starting some scripted SUS tests on ITMY | Will advise when I'm finished, will
be by 1 pm for ALS work to begin. |
|
|
14537
|
Thu Apr 11 12:21:01 2019 |
not Koji | Update | PSL | PSL fan is noisy | I could probably install the new fan if
we have one. Can you do without the
laser for a while? |
|
|
14538
|
Thu Apr 11 12:57:48 2019 |
Jon | Update | SUS | Starting some scripted SUS tests on ITMY | Testing is finished.
|
|
|
14539
|
Thu Apr 11 17:30:45 2019 |
Jon | Update | SUS | Automated suspension testing with susPython | Summary
In anticipation of
needing to test hundreds of suspension
signals after the c1susaux upgrade, I've |
|
|
14540
|
Fri Apr 12 01:22:27 2019 |
Anjali | Update | Frequency noise measurement | Frequency noise measurement of 1 micron source | The alignement was disturbed after the
replcement of the beam splitter. We tried
to get the alignment back . But we are |
|
|
14541
|
Mon Apr 15 10:20:44 2019 |
gautam | Update | Optical Levers | BS Oplev PIT was oscillating | The AS spot on the camera was oscillating
at ~3 Hz. Looking at the Oplevs, the culprit
was the BS PIT DoF. Started about 12 hours |
|
|
14542
|
Mon Apr 15 18:13:23 2019 |
rana | Update | Computer Scripts / Programs | Automated suspension testing with susPython | if this gonna be general for everybody,
maybe it oughta be called IFOtest
(like the last incarnation that was tried |
|
|
14544
|
Mon Apr 15 22:39:10 2019 |
gautam | Update | Frequency noise measurement | Alternate setup with PSL pickoff | [anjali, gautam]
just main points, anajli is going
to fill out the details. |
|
|
14546
|
Tue Apr 16 22:06:51 2019 |
gautam | Update | VAC | Vac interlock tripped again | This happened again, about 30,000 seconds
(~2:06pm local time according to the logfile)
ago. The cited error was the same - |
|
|
14547
|
Wed Apr 17 00:43:38 2019 |
gautam | Update | Frequency noise measurement | MZ interferometer ---> DAQ |
Delay fiber was replaced with 5m
(~30 nsec delay)
The fringing
of the MZ was way too large even with the |
|
|
14548
|
Wed Apr 17 00:50:17 2019 |
gautam | Update | ALS | Large 2kHz peak (and harmonics) in ALS X no more | I looked into this issue today. Initially,
my thinking was that I'd somehow caused
clipping in the beampath somewhere which |
|
|
14549
|
Wed Apr 17 11:01:49 2019 |
gautam | Update | ALS | Large 2kHz peak (and harmonics) in ALS X no more | EX green stayed locked to XARM length overnight
without a problem. The spectrogram doesn't
show any alarming time varying features around |
|
|
14550
|
Wed Apr 17 18:12:06 2019 |
gautam | Update | VAC | Vac interlock tripped again | After getting the go ahead from Chub and
Jon, I restored the Vacuum state to "Vacuum
normal", see Attachment #1. Steps: |
|
|
14551
|
Thu Apr 18 22:35:23 2019 |
gautam | Update | SUS | ETMY actuator diagnosis | [rana, gautam]
Rana did a checkout of my story |
|
|
14552
|
Thu Apr 18 23:10:12 2019 |
gautam | Update | Loss Measurement | X arm misaligned | Yehonathan wanted to take some measurements
for loss determination. I misaligned the
X arm completely and we installed a PD on |
|
|
14554
|
Fri Apr 19 11:36:23 2019 |
gautam | Update | SUS | No consistent solution for output matrix | Ther isn't a consistent set of OSEM
coil gains that explains the best actuation
vectors we determined yesterday. Here are |
|
|
14556
|
Fri Apr 19 14:06:36 2019 |
gautam | Update | PSL | Innolight NPRO shutoff | When I got back from lunch just now, I
noticed that the PMC TRANS and REFL cameras
were showing no spots. I |
|
|
14557
|
Fri Apr 19 15:13:38 2019 |
rana | Update | SUS | No consistent solution for output matrix | let us
have 3 by 4, nevermore |
|
|
14558
|
Fri Apr 19 16:19:42 2019 |
gautam | Update | SUS | Actuation matrix still not orthogonal | I repeated the exercise from yesterday,
this time driving the butterfly mode [+1
-1 -1 +1] and adding the tuned PIT and |
|
|
14559
|
Fri Apr 19 19:22:15 2019 |
rana | Update | SUS | Actuation matrix still not orthogonal | If thy left hand troubles thee
then let the mirror show the right
for if it troubles enough to cut |
|
|
14560
|
Fri Apr 19 20:21:52 2019 |
gautam | Update | PSL | Innolight NPRO shutoff | Happened again at ~730pm.
The NPRO diag channels don't
really tell me what happened in a causal |
|
|
14561
|
Mon Apr 22 21:33:17 2019 |
Jon | Update | SUS | Bench testing of c1susaux replacement | Today I bench-tested most of the Acromag
channels in the replacement c1susaux. I connected
a DB37 breakout board to each chassis feedthrough |
|
|
14562
|
Mon Apr 22 22:43:15 2019 |
gautam | Update | SUS | ETMY sensor diagnosis | Here are the results from this test. The
data for 17 April is with the DC bias for
ETMY set to the nominal values (which gives |
|
|
14563
|
Tue Apr 23 18:48:25 2019 |
Jon | Update | SUS | c1susaux bench testing completed | Today I tested the remaining Acromag channels and
retested the non-functioning channels found
yesterday, which Chub repaired this morning. |
|
|
14564
|
Tue Apr 23 19:31:45 2019 |
Jon | Update | SUS | Watchdog channels separated from autoBurt.req | For the new c1susaux, Gautam and I moved
the watchdog channels from autoBurt.req to
a new file named autoBurt_watchdogs.req. When |
|
|
14566
|
Wed Apr 24 16:06:44 2019 |
gautam | Update | PSL | Innolight NPRO shutoff | After discussing with Koji, I turned the
NPRO back on again, at ~4PM local time. I
first dialled the injection current down |
|
|
14567
|
Wed Apr 24 17:07:39 2019 |
gautam | Update | SUS | c1susaux in-situ testing [and future of IFOtest] | [jon, gautam]
For the in-situ test, I decided
that we will use the physical SRM to test |
|
|
14569
|
Thu Apr 25 00:30:45 2019 |
gautam | Update | SUS | ETMY BR mode | We briefly talked about the bounce and
roll modes of the SOS optic at the meeting
today. |
|
|
14570
|
Thu Apr 25 01:03:29 2019 |
gautam | Update | PSL | MC trans is ~1000 cts (~7%) lower than usual | When dialing up the current, I went up
to 2.01 A on the front panel display, which
is what I remember it being. The label on |
|
|
14571
|
Thu Apr 25 03:32:25 2019 |
Anjali | Update | Frequency noise measurement | MZ interferometer ---> DAQ |
Attachment #1 shows the time domain
output from this measurement. The contrast
between the maximum and minimum is better |
|
|
14572
|
Thu Apr 25 10:13:15 2019 |
Chub | Update | General | Air Handler Out of Commission | The air handler on the roof of the 40M
that supplies the electronics shop and computer
room is out of operation until next week. |
|
|
14573
|
Thu Apr 25 10:25:19 2019 |
gautam | Update | Frequency noise measurement | Homodyne v Heterodyne | If I understand correctly, the Mach-Zehnder
readout port power is only a function of
the differential phase accumulated between |
|
|
14574
|
Thu Apr 25 10:32:39 2019 |
Jon | Update | VAC | Vac interlocks updated | I slightly cleaned up Gautam's disabling
of the UPS-predicated vac interlock and restarted
the interlock service. This interlock is |
|
|
14575
|
Thu Apr 25 11:27:11 2019 |
gautam | Update | VAC | PSL shutter re-opened | This activity seems to have closed the
PSL shutter (actually I'm not sure why
that happened - the interlock should only |
|
|
14576
|
Thu Apr 25 15:47:54 2019 |
Anjali | Update | Frequency noise measurement | Homodyne v Heterodyne | My understanding is that the main advantage
in going to the heterodyne scheme is that
we can extract the frequecy noise information |
|
|
14577
|
Thu Apr 25 17:31:56 2019 |
gautam | Update | PSL | Innolight NPRO shutoff | NPRO shutoff at ~1517 local time
today afternoon. Again, not many clues from
the NPRO diagnostics channel, but to my eye, |
|
|
14578
|
Thu Apr 25 18:14:42 2019 |
Anjali | Update | PSL | Door broken | It is noticed that one of the doors (door
# 2 ) of the PSL table is broken. Attachement
#1 shows the image |
|
|
14579
|
Fri Apr 26 12:10:08 2019 |
Anjali | Update | Frequency noise measurement | Frequency noise measurement of 1 micron source | From the earlier results with homodyne
measurement,the Vmax and Vmin
values observed were comparable with |
|
|
14580
|
Fri Apr 26 12:32:35 2019 |
Jon | Update | PSL | modbusPSL service shut down | Gautam and I are removing the prototype
Acromag chassis from the 1x4 rack to
make room for the new c1susuax hardware. |
|
|
14581
|
Fri Apr 26 19:35:16 2019 |
Jon | Update | SUS | New c1susaux installed, passed first round of scripted testing | [Jon, Gautam]
Today we installed the c1susaux
Acromag chassis and controller computer in |
|
|
14582
|
Sun Apr 28 16:00:17 2019 |
gautam | Update | Computer Scripts / Programs | List of suspension test | Here are some tests we should script.
Checking Coil Vmons, OSEM
PDmons, and watchdog enable wiring
Disable |
|
|
14583
|
Mon Apr 29 16:25:22 2019 |
gautam | Update | PSL | PSL turned on again | I turned the 2W NPRO back on again at ~4pm
local time, dialing the injection current
up from 0-2A in ~2 mins. I noticed today |
|