| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2836
|
Fri Apr 23 21:02:14 2010 |
rana, joe | Update | LSC | Started dev of LSC FE | Joe and I started working on the new LSC
FE control today. We made a diagram of the
system in Simulink, but were unable to compile |
|
|
4232
|
Mon Jan 31 12:40:38 2011 |
rana, joe | Update | Green Locking | DFD - medm screen | This is a plot showing the old filters
and the new ones we added this morning.
The new ones have a Cheby for AC |
|
|
3603
|
Thu Sep 23 23:24:43 2010 |
rana, johnny, tara | Summary | PSL | AM modulate AOM to measure RefCav Thermo-Optic coefficient | Big Johnny and I hacked a function
generator output into the cross-connect of
the 80 MHz VCO driver so that we could modulate |
|
|
930
|
Thu Sep 4 18:02:34 2008 |
rana, josephb | Configuration | PEM | Accelerometer gains increased by 10 | [COLOR=chocolate][SIZE=3]We increased the
Accelerometer gains by 10 by modifying the
C1ADCU_PEM.ini file.[/SIZE][/COLOR]
|
|
|
882
|
Mon Aug 25 17:45:34 2008 |
rana, josephb, rob | HowTo | PEM | Accelerometer range | Joe shows us by jumping up ~15" in the control
rom that the accelerometers are set with
not enough gain.
|
|
|
894
|
Thu Aug 28 19:02:25 2008 |
rana, josephb, rob | Summary | Computers | big boot | This afternoon Joe did something with an .ini
file (look for his detailed elog entry) and
the computers went bad.
|
|
|
6034
|
Tue Nov 29 07:45:56 2011 |
rana, josh | Summary | Computer Scripts / Programs | 40m Daily News web pages | As part of the initiative to
get a good daily summary page for aLIGO commissioning,
Josh is spearheading his |
|
|
3014
|
Sun May 30 13:26:07 2010 |
rana, kiwamu | Update | PSL | new HIGH-LOW value for PMC_TRANS | We changed
the HIGH/LOW values of the PMC_TRANS. |
|
|
2442
|
Tue Dec 22 02:50:09 2009 |
rana, kiwamu, jenne | Update | ASS | OAF Feedaround ON and doing something good | Kiwamu made the OAF screen functional today
- screenshot attached.
After this, I used the measured TF |
|
|
4331
|
Sun Feb 20 21:22:33 2011 |
rana, kiwamu, valera | Configuration | IOO | MC Servo Change | For some reason, Kiwamu |
|
|
3556
|
Fri Sep 10 02:35:30 2010 |
rana, kiwamu, valera, tara | Configuration | PSL | update | Over the last couple nights we got the
beam into the FSS path and all the way to
the IMC and out onto the AP table. |
|
|
1451
|
Wed Apr 1 23:18:07 2009 |
rana, koji | Summary | IOO | No Reference Cavity Required | Koji sent us a note about our "No Reference
Cavity Required" entry. I thought that it
nicely summarizes the
|
|
|
1731
|
Fri Jul 10 19:56:23 2009 |
rana, koji | Omnistructure | Environment | Changed office temp | I have increased the temperature setpoint
in the office area by ~0.75 deg F. Figure
attached. Also a few days ago I increased |
|
|
2242
|
Wed Nov 11 18:43:57 2009 |
rana, koji | HowTo | Photos | Illuminated Paintbrush Technique | |
|
|
2762
|
Sun Apr 4 00:21:42 2010 |
rana, koji | Summary | Electronics | Checkout of EG&G (PARC) preamp model #113, s/n 49135 | We tested out the functionality of the
EG&G 113 preamp that I found in one of
the cabinets. This is one of the ancestors |
|
|
3903
|
Fri Nov 12 00:42:11 2010 |
rana, koji | Update | IOO | MC alignment | We decided to ignore the computer script
outputs for the beam positions and use instead
the eyeball method to get the beam into the |
|
|
4253
|
Fri Feb 4 23:39:56 2011 |
rana, koji | Update | LSC | mixer based FD set up for noise test | We set up the mixer based FD to check
out its noise performance.
It is being acquired as C1:GCV-XARM_FINE_OUT_DAQ. |
|
|
4254
|
Sat Feb 5 23:03:04 2011 |
rana, koji | Summary | Electronics | Analog Frequency Discriminator: splitter + mixer + long cable | This diagram shows the setup |
|
|
6198
|
Sat Jan 14 00:50:08 2012 |
rana, koji | Configuration | IOO | Towards coating thermal noise measurement with RefCav / MC beat | Koji asked aloud tonight if we could |
|
|
9324
|
Thu Oct 31 21:22:00 2013 |
rana, koji | Summary | IOO | modulation beat note in MC servo | I hooked up the 4395 to the MC servo board
test out (TP2A) and looked at the spectrum
using our new SPAG4395.py script. We noticed |
|
|
9760
|
Fri Mar 28 22:10:00 2014 |
rana, koji | Update | SUS | recovery from | * EQ Southeast of LA around 45 minutes
ago. Callum and I felt it.
|
|
|
10832
|
Mon Dec 22 21:53:08 2014 |
rana, koji | Update | IOO | Seven transfer functions | Today we were looking at the MC TFs and
pulled out the FSS box to measure it. We
took photos and removed a capacitor with |
|
|
10833
|
Tue Dec 23 01:55:35 2014 |
rana, koji | Update | IOO | Seven transfer functions | Some TFs of the TTFSS box |
|
|
10841
|
Tue Dec 23 20:50:39 2014 |
rana, koji | Update | IOO | Seven transfer functions | Today we decided to continue to modify
the TTFSS board.
The modified schematic can be found |
|
|
11343
|
Tue Jun 2 21:22:07 2015 |
rana, koji | Configuration | IOO | AOM inserted in beam and aligned | We
spent an hour today to put the AOM back in |
|
|
11361
|
Mon Jun 15 22:36:40 2015 |
rana, koji | Update | Green Locking | BeatBox Assay: not looking good | Because the ALS beatbox schematic is out-of-date
and misleading, we pulled the box to photograph
the current implementation and figure out |
|
|
11363
|
Fri Jun 19 01:24:26 2015 |
rana, koji | Update | Green Locking | BeatBox Assay: not looking good | We had decided a few days ago, to bypass
the IF part of the BeatBox board and put
some of the Haixing Maglev generic filter |
|
|
12639
|
Wed Nov 23 17:48:16 2016 |
rana, koji | Update | IOO | How bad is the McWFS? | Medium.
Previous elog entries on
this: |
|
|
14730
|
Fri Jul 5 23:28:52 2019 |
rana, kruthi | Summary | SUS | ETMX unstuck by shaking the stack | We unstuck ETMX by shaking the stack. Most
effective was to apply large periodic human
sized force to the north STACIS mounts. |
|
|
8741
|
Tue Jun 25 00:28:52 2013 |
rana, manasa | Update | LSC | Arm Cavity scan with X-ALS after ALS servo upgrade | [Rana, Manasa]
ALS noise suppressed to |
6x |
|
3173
|
Wed Jul 7 22:52:38 2010 |
rana, nancy | Configuration | IOO | bad length control offset for the MC | Rana found out that a connection was bad
in the shown place, due to which the MEDM
screen was showing bad offset for length |
|
|
9089
|
Fri Aug 30 01:01:28 2013 |
rana, nic | Summary | Computer Scripts / Programs | aLIGO Noise Budget code installed and running | Chris Wipf has been developing a new Noise
Budget code that allows us to use our existing
Simulink models to handle all of the noise |
|
|
1888
|
Tue Aug 11 23:55:04 2009 |
rana, rich | Summary | OMC | Quantum Efficiency and Dark Current measurements of eLIGO Photodiodes | Rich Abbott, Rana
Summary: We found that the 3mm
InGaAs photodiodes from eGTRAN which are |
|
|
2095
|
Thu Oct 15 02:38:10 2009 |
rana, rob | Update | OMC | Dark Port Mode Scan using the OMC | Bottom trace is proportional to the OMC
PZT voltage - top trace is the transmitted
light through the OMC. Interferometer is |
|
|
2101
|
Fri Oct 16 03:16:50 2009 |
rana, rob | Summary | LSC | funny timing setup on the LSC | While measuring the Piezo Jena noise
tonight we noticed that the LSC timing is
setup strangely. |
|
|
2118
|
Mon Oct 19 14:48:15 2009 |
rana, rob | Summary | Electronics | piezo jena measuring box | Attached is the schematic of the Piezo Jena
driver measuring box made in a Pomona box:
|
|
|
2311
|
Mon Nov 23 00:46:09 2009 |
rana, rob | Update | PSL | ISS RIN: Its too high by 10x | This plot shows the RIN as measured
by the ISS. Its ~2 x 10^-7, whereas its supposed
to be more like 3 x 10^-8. |
|
|
2125
|
Tue Oct 20 11:38:10 2009 |
rana, rolf | Update | Adaptive Filtering | extra delay and noise in PEM -> ASS/OAF system | An email from Rolf about the delay in
the 110Bs:
|
|
|
3052
|
Sun Jun 6 08:08:05 2010 |
rana, sanjit | Summary | Electronics | Capacitor Bridge Test | To get a feel for the Capacitive Bridge
problems, we setup a simple bridge using
fixed (1 nF) caps on a breadboard. We used |
|
|
1601
|
Mon May 18 19:44:52 2009 |
rana, steve | Configuration | VAC | Cryo Pump turned off and valved off: 1 beer can only | I was seeing some excess noise in the ETMY
oplev yaw and so we turned off the cryo and
restarted c1vac2 to get the turbo pump channels |
|
|
2598
|
Fri Feb 12 14:19:28 2010 |
rana, steve | HowTo | lore | International Fax | Steve showed me how to send an international
fax today:
Load paper.
|
|
|
3284
|
Sat Jul 24 13:13:41 2010 |
rana, steve, alberto | Update | General | Initial Crane Inspection reveals flaws: wiring and oil | The guy from KroneCrane (sp?) came today
and started the crane inspection on the X
End Crane. There were issues with our crane |
|
|
3573
|
Wed Sep 15 01:27:52 2010 |
rana, steve, valera | Update | PSL | FSS cables connected | - connected the TTFSS cables (FSS fast
goes directly to NPRO PZT for now)
- measured the reference cavity 21.5 |
|
|
4281
|
Mon Feb 14 00:39:21 2011 |
rana, suresh | Update | Electronics | VCO Frequency Noise Measurement with the MFD | We hooked up the VCO Driver output to the
MFD. We adjusted the levels with attenuators
to match up to the Level 7 mixer that's being |
|
|
3640
|
Fri Oct 1 21:34:14 2010 |
rana, tara | Update | PSL | High Voltage Driver added to TTFSS -> NPRO |
|
|
|
3641
|
Mon Oct 4 06:47:46 2010 |
rana, tara | Update | PSL | High Voltage Driver added to TTFSS -> NPRO | Inside the FSS box, the FAST path has a
~10 Hz pole made up from the 15k resistor
and the 1 uF cap before the output connector. |
|
|
3542
|
Wed Sep 8 00:01:07 2010 |
rana, valera | Update | PSL | PMC update | We ran the cables for the PMC: The RF cable
for the 35.5 MHz drive was cheap and so we
swapped the 29.5 MHz cable for it. |
|
|
4792
|
Mon Jun 6 23:56:16 2011 |
rana, valera | Configuration | SUS | ETMX/ETMY OSEM whitening | We measured the OSEM PD whitening
transfer function of the ETMX OSEM UL whitening
stage ( |
|
|
12573
|
Wed Oct 19 18:32:25 2016 |
rana, yinzi | Update | PSL | RefCav thermal control: heater is dead | We wanted to re-activate the Heater for
the reference cavity today to use it as a
testbed for PID autotuning and the new heater |
|
|
1314
|
Mon Feb 16 22:58:51 2009 |
rana, yoichi | Configuration | SUS | Hysteresis in SUS from Misalignments | WE wondered if there was some hysteresis in
the SUS alignments. When we leave the optics
misaligned for a
|
|