ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
14555
|
Fri Apr 19 12:06:31 2019 |
awade | Bureaucracy | Electronics | Borrowed Busby Box May 19th 2019 | I've borrowed the Busby Box for a day
or so. Location: QIL lab at Bridge
West. |
|
|
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 |
|
|
14553
|
Fri Apr 19 09:42:18 2019 |
Koji | Bureaucracy | General | Item borrowing (40m->OMC) | Apr 16, 2019
Borrowed
two laser goggles from the 40m. (Returned |
|
|
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 |
|
|
14551
|
Thu Apr 18 22:35:23 2019 |
gautam | Update | SUS | ETMY actuator diagnosis | [rana, gautam]
Rana did a checkout of my story |
|
|
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: |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 - |
|
|
14545
|
Mon Apr 15 22:55:34 2019 |
gautam | Frogs | Thermal Compensation | Lab thermostat adjusted | It is feeling cold in the office area.
According to the digital wall clock near
the coffee machine, it is 19C. Rana bumped |
|
|
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. |
|
|
14543
|
Mon Apr 15 18:29:07 2019 |
rana | Summary | Computers | new laptop setup: ASIA - yum issues | had trouble using YUM to update. This turned
out to be a config problem with our Martian
router, not the new laptop. Since I've |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
14538
|
Thu Apr 11 12:57:48 2019 |
Jon | Update | SUS | Starting some scripted SUS tests on ITMY | Testing is finished.
|
|
|
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? |
|
|
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. |
|
|
14535
|
Thu Apr 11 11:42:10 2019 |
Koji | Update | PSL | PSL fan is noisy | This thread: ELOG
10295
My interpretation of these ELOGs |
|
|
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. |
|
|
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 |
|
|
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! |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
14527
|
Tue Apr 9 18:44:00 2019 |
gautam | Update | ALS | EX Green PDH discriminant measurement | I decided to use the more direct method,
of disconnecting feedback to the EX laser
PZT, and then looking at the cavity flashes. |
|
|
14526
|
Tue Apr 9 00:18:19 2019 |
gautam | Update | ALS | EX Green PDH error monitor calibrated | wrong assumption - i checked the gain just
now, it is G=10, and is running in the "low-noise"
mode, so can only drive 4V. fixed elog, filter. |
|
|
14525
|
Tue Apr 9 00:16:22 2019 |
rana | Update | ALS | EX Green PDH error monitor calibrated | G=10 or
G=100? |
|
|
14524
|
Mon Apr 8 23:52:09 2019 |
gautam | Update | ALS | EX Green PDH error monitor calibrated | Some time ago, I had done an actuator
calibration of ITMX. This suspension
hasn't been victim to the recent spate |
|
|
14523
|
Mon Apr 8 18:28:25 2019 |
gautam | Update | ALS | EX Green PDH checkout | I worked on characterizing the green PDH
setup at EX, as part of the ALS noise budgeting
process. Summary of my findings: |
|
|
14522
|
Mon Apr 8 11:53:17 2019 |
gautam | Update | CDS | c1oaf needs debugging | I tried restarting c1oaf this weekend to
see if turning on the MC length FF would
affect the ALS noise performance. I burtrestored |
|
|
14521
|
Mon Apr 8 00:04:08 2019 |
gautam | Update | ALS | IR ALS noise budget | To start the noise budgeting, I decided
to measure the "DFD noise", which
is really the quadrature sum of the following |
|
|
14520
|
Sat Apr 6 02:07:40 2019 |
Anjali | Update | Frequency noise measurement | Frequency noise measurement of 1 micron source |
The alignment of the output beam
from the delayed path of MZI to the photodetector
was disturbed when we did the polarisation |
|
|
14519
|
Fri Apr 5 11:49:30 2019 |
gautam | Update | ALS | PSL + X green beat recovery | Since we haven't been using it, the
PID control was not enabled on the doubling
oven on the PSL table (it is disabled after |
|
|
14518
|
Fri Apr 5 11:40:57 2019 |
Anjali | Update | Frequency noise measurement | Frequency noise measurement of 1 micron source |
Attachment #1 shows the present
experimental setup. The photodiode is now
replaced with PDA255. The farther end of |
|
|
14517
|
Fri Apr 5 01:10:18 2019 |
gautam | Update | VAC | TP3 forepump is also noisy | Is this one close to failure as well? |
|
|
14516
|
Fri Apr 5 00:33:58 2019 |
gautam | Update | ALS | Promising IR ALS noise | Summary:
I set up a free-space
beat on theNW side of the PSL table between |
|
|
14515
|
Wed Apr 3 18:35:54 2019 |
gautam | Update | VAC | PSL shutter re-opened | PSL shutter was re-opened at 6pm local
time. IMC was locked. As of 10pm, the main
volume pressure is already back down to the |
|
|
14514
|
Wed Apr 3 16:17:17 2019 |
Jon | Update | VAC | TP2 forepump replaced | I can't explain the mechanical switching
sound Gautam reported. The relay controlling
power to the TP2 forepump is housed in the |
|
|
14513
|
Wed Apr 3 12:32:33 2019 |
Koji | Update | ALS | Note about new fiber couplers | Andrew seems to have an integrated solution
of PBS+HWP in a singe mount. Or, I wonder
if we should use HWP/QWP before the coupler. |
|
|
14512
|
Wed Apr 3 10:42:36 2019 |
gautam | Update | VAC | TP2 forepump replaced | Bob and Chub concluded that the drypump
that serves as TP2's forepump had failed.
Steve had told me the whereabouts of a spare |
|
|
14511
|
Wed Apr 3 09:07:46 2019 |
gautam | Update | VAC | Vac failure | Overnight pressure trends don't suggest
anything went awry after the initial interlock
trip. |
|
|
14510
|
Wed Apr 3 09:04:01 2019 |
gautam | Update | ALS | Note about new fiber couplers | The new fiber beam splitters we are ordering,
PFC-64-2-50-L-P-7-2-FB-0.3W,
have the slow axis working and fast axis |
|
|
14509
|
Tue Apr 2 18:40:01 2019 |
gautam | Update | VAC | Vac failure | While glancing at my |
|
|
14508
|
Tue Apr 2 15:02:53 2019 |
Jon | Update | CDS | ITMY freed | |
|
|
14507
|
Tue Apr 2 14:53:57 2019 |
gautam | Update | CDS | c1vac added to burt | I deleted references to c1vac1 and c1vac2
(which no longer exist) and added c1vac to
the autoburt request file list at |
|