| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
14506
|
Mon Apr 1 22:33:00 2019 |
gautam | Update | CDS | ITMY freed | While Anjali is working on the 1um MZ setup,
the pesky ITMY was liberated from the OSEMs.
The "algorithm" : |
|
|
14505
|
Mon Apr 1 12:01:52 2019 |
Jon | Update | CDS | | I brought c1susaux back online this morning
for suspension-channel test scripting. It
had been dead for some time. I followed |
|
|
14504
|
Sun Mar 31 18:39:45 2019 |
Anjali | Update | AUX | AUX laser fiber moved from AS table to PSL table |
Attachment #1 shows the schematic
of the experimental setup for the frequency
noise measurement of 1 um laser source. |
|
|
14503
|
Sun Mar 31 15:05:53 2019 |
gautam | Update | ALS | Fiber beam-splitters not PM | I looked into this a little more today.
Looking at the beat signal
between the PSL and EX beams from the |
|
|
14502
|
Fri Mar 29 21:00:06 2019 |
gautam | Update | ALS | BeatMouth with NF1611s installed |
Newfocus 15V current limited supply
was taken from bottom NE corner of the ITMY
Oplev table to power the BeatMouth on the |
|
|
14501
|
Fri Mar 29 15:47:58 2019 |
gautam | Update | AUX | AUX laser fiber moved from AS table to PSL table | [anjali, gautam]
To facilitate the 1um MZ frequency
stabilization project, I decided that the |
|
|
14500
|
Fri Mar 29 11:43:15 2019 |
Jon | Update | Upgrade | Found c1susaux database bug | I found the current bias output channels,
C1:SUS-<OPTIC>_<DOF>BiasAdj,
were all pointed at C1:SUS-<OPTIC>_ |
|
|
14499
|
Thu Mar 28 23:29:00 2019 |
Koji | Update | SUS | Suspension PD whitening and I/F boards modified for susaux replacement | Now
the sus PD whitening bards
are ready to move the |
|
|
14498
|
Thu Mar 28 19:40:02 2019 |
gautam | Update | ALS | BeatMouth with NF1611s assembled | Summary:
The parts I was waiting for arrived.
I finished the beat mouth assembly, and did |
|
|
14497
|
Tue Mar 26 18:35:06 2019 |
Jon | Update | Upgrade | Modbus IOC is running on c1susaux2 | Thanks to new
info from Johannes, I was able to finish
setting up the modbus IOC on c1susaux2. |
|
|
14496
|
Tue Mar 26 04:25:13 2019 |
Johannes | Update | Upgrade | c1susaux upgrade plan |
Quote:
|
|
|
14495
|
Mon Mar 25 10:21:05 2019 |
Jon | Update | Upgrade | c1susaux upgrade plan | Now that the Acromag upgrade of c1vac is
complete, the next system to be upgraded
will be c1susaux. We chose c1susaux because |
|
|
14494
|
Thu Mar 21 21:50:31 2019 |
rana | Update | VAC | Protection against AC power loss | agreed - we need all pumps on UPS for their
safety and also so that we can spin them
down safely. Can you and Chub please find |
|
|
14493
|
Thu Mar 21 18:36:59 2019 |
Jon | Omnistructure | Upgrade | Vacuum Controls Switchover Completed | Updated vac channel list is attached. There
are several new ADC channels.
|
|
|
14492
|
Thu Mar 21 18:09:36 2019 |
Koji | Update | CDS | db file preparation for acromag c1susaux | I have updated the google doc spreadsheet
to indicate the required action for the new
dbfile |
|
|
14491
|
Thu Mar 21 17:22:52 2019 |
Jon | Update | VAC | More vac controls upgrades | I've converted all the vac control
system code to run on Python 3.4, the latest
version available through the Debian |
|
|
14490
|
Thu Mar 21 12:46:22 2019 |
Jon | Update | VAC | More vac controls upgrades | The vac controls system is going down for
migration from Python 2.7 to 3.4. Will advise
when it is back up. |
|
|
14489
|
Wed Mar 20 20:07:22 2019 |
Jon | Update | VAC | Doing vac controls work | Work is completed and the vac system is
back in its nominal state.
|
|