| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10733
|
Mon Nov 24 20:24:29 2014 |
diego | Update | SUS | Anti-Jitter Telescope for OpLevs | I stared a bit longer at the plots and
thanks to Eric's feedback I noticed I payed
too much attention to the comparison between |
6x |
|
10732
|
Fri Nov 21 18:23:01 2014 |
diego | Update | SUS | Anti-Jitter Telescope for OpLevs | EDIT: some images look
bad on the elog, and the notebook is parsed, |
14x |
|
10731
|
Fri Nov 21 13:58:51 2014 |
ericq | Update | Optical Levers | HeNe RIN test | Steve had me measure the RIN of a
JDSU HeNe laser. I used a PDA520, and measured
the RIN after the laser had been running |
|
|
10730
|
Fri Nov 21 11:41:24 2014 |
manasa | Update | General | X end fiber insulated and on cable tray |
|
|
|
10729
|
Fri Nov 21 02:22:25 2014 |
ericq | Update | LSC | More ALS PRFPMI exploration | Similar to what Jenne did the other
night, I kept the PRFPMI arm DoFs locked
on ALS, in hopes to check out the RF error |
|
|
10728
|
Thu Nov 20 22:43:15 2014 |
Koji | Update | IOO | IMC WFS damping gain adjustment | From the measured OLTF, the dynamics of
the damped suspension was inferred by calculating
H_damped = H_pend / (1+OLTF). |
|
|
10727
|
Tue Nov 18 22:34:28 2014 |
Jenne | Update | LSC | Some other plots from PRFPMI |
|
|
|
10726
|
Tue Nov 18 17:11:30 2014 |
Jenne | Update | LSC | Some lockloss plots from PRFPMI | I am still staring at / trying to figure
out the latter 4 locklosses posted earlier.
But, I have just included the transmission |
|
|
10725
|
Tue Nov 18 15:20:58 2014 |
Jenne | Update | LSC | Some lockloss plots from PRFPMI | Elog from ~5am last night:
Tonight was just several trials
of PRFPMI locking, while trying to pay more |
8x |
|
10724
|
Mon Nov 17 23:04:51 2014 |
Jenne | Update | PSL | Aligned PMC | I aligned the beam into the PMC, mostly
in yaw. Don't know why it drifted,
but it was annoying me, so I fixed it. |
|
|
10723
|
Mon Nov 17 20:40:29 2014 |
rana, diego | Update | IOO | Investigating the IMC WFS situation | We've known for years that the IMC WFS
sensing chain is pointlessly bad, but until
recently, we haven't thought it was worth |
|
|
10722
|
Mon Nov 17 20:28:17 2014 |
rana | Summary | IOO | MC servo summing amp | I modified the /cvs/cds/caltech/target/c1psl/psl.db
file to adjust the records for the FSS-FAST
signal (to make it go yellow / red at the |
|
|
10721
|
Sat Nov 15 21:51:09 2014 |
rana | Update | PEM | Seismometers set up for huddle test | In order to do high quality
huddle subtraction, we need to align the
seismometer axes to high precision. We would |
|
|
10720
|
Fri Nov 14 20:31:13 2014 |
ericq | Update | LSC | RIN in transmission a problem? | I took a quick look at single arm RIN.
Actuating on MC2 vs. the ETM, or using AS55
instead of POY11 made no noticeable difference |
|
|
10719
|
Fri Nov 14 19:28:33 2014 |
Jenne | Update | SUS | ASS gain reduced for Yarm | [Koji, Jenne]
We noticed last night that the yarm
couldn't handle the old nominal gain for |
|
|
10718
|
Fri Nov 14 17:08:17 2014 |
Jenne | Update | LSC | RIN vs. Seismic | T-240 has a different convention than we
use. It assumes that North is aligned
with the Y-axis. Since this is the |
|
|
10717
|
Fri Nov 14 15:45:34 2014 |
Jenne | Update | CDS | Computers back up after reboot | [Jenne, Q]
Everything |
|
|
10716
|
Fri Nov 14 15:26:45 2014 |
Steve | Update | safety | Diego gets safety traning | Diego Bersanetti received 40m specific
safety training today. |
|
|
10715
|
Fri Nov 14 11:07:59 2014 |
manasa | Update | CDS | Not able to run models on FE machines |
|
|
|
10714
|
Fri Nov 14 08:25:29 2014 |
Steve | Update | SUS | morning issues | PRM, SRM and the ENDs are kicking up.
Computers are down. PMC slider is stuck
at low voltage. |
|
|
10713
|
Fri Nov 14 02:43:05 2014 |
ericq | Update | LSC | PRFPMI HOM resonances | I've extended my analysis to the PRFPMI
case, with the current working knowledge
of radii of curvature and cavity lengths. |
|
|
10712
|
Thu Nov 13 23:42:01 2014 |
Jenne | Update | LSC | RIN vs. Seismic | After Kate, Diego and I moved the seismometers
to the corner for a huddle test (see elog
10711), I wanted to check the coherence |
|
|
10711
|
Thu Nov 13 22:52:48 2014 |
kate | Update | PEM | Seismometers set up for huddle test | Jenne, Diego, Kate
We want to conduct a huddle test
with the three 40m seismometers (2 Guralps |
|
|
10709
|
Thu Nov 13 04:28:28 2014 |
Jenne | Update | LSC | RIN in transmission a problem? | [Jenne, Rana, Koji]
We
did some thinking on what could be causing |
|
|
10708
|
Thu Nov 13 01:03:28 2014 |
rana, jenne | Update | SUS | OL updates on ITMs and ETMs | We copied the new SRM filters over
onto the OL banks for the ITMs and ETMs.
We then adjusted the gain to be 3x lower |
|
|
10707
|
Thu Nov 13 01:00:37 2014 |
rana | Update | LSC | RIN in transmission a problem? |
I modified the MC2 trans optical
setup a little bit: the reflection from the |
|
|
10706
|
Wed Nov 12 22:22:11 2014 |
Koji | Summary | IOO | Estimation of the angular jitter imposed by the TTs | [Koji, Rana, Jenne]
One coil of the TT produce 36nrad/rtHz
at DC. |
|
|
10705
|
Wed Nov 12 21:18:32 2014 |
ericq | Update | LSC | DRFPMI, PRFPMI HOM resonances | So, with my last entry, I was guilty of
just throwing stuff into the simulation and
not thinking about physics... so I retreated |
|
|
10704
|
Wed Nov 12 20:11:41 2014 |
Koji | Update | IOO | MC WFS gain reduced again | MC WFS was oscillative at 1Hz. I've reduced
the servo gain further (x1, x1, x10, x1,
x1, and x10). |
|
|
10703
|
Wed Nov 12 18:08:35 2014 |
Jenne | Update | LSC | RIN in transmission a problem? | In my previous meditations about RIN, particularly
elog
10258, I was only thinking about the |
|
|
10702
|
Wed Nov 12 15:14:09 2014 |
manasa | Update | General | X end AUX laser fiber setup | I looked at the endtable for possible
space to setup optics in order to couple
the X end laser into a PM fiber. |
|
|
10701
|
Wed Nov 12 03:22:23 2014 |
Jenne | Update | LSC | 3f DRMI sensing mat | Koji pointed out something to me that I
think he had told me ages ago, and Rana alluded
to last night: Since I'm not tuning |
8x |
|
10700
|
Wed Nov 12 01:30:39 2014 |
ericq | Update | LSC | DRFPMI, PRFPMI HOM resonances | I did some simulations to see if we are
susceptible to HOM resonances as we reduce
the CARM offset. I restricted my search to |
|
|
10699
|
Wed Nov 12 00:55:56 2014 |
ericq | Update | LSC | Notch at 110MHz |
|
|
|
10698
|
Tue Nov 11 21:41:09 2014 |
Koji | Update | LSC | 3f DRMI sensing mat | Sensing
matrix calculation using DTT + Matlab
Note: If the signal phase is, for |
|
|
10697
|
Tue Nov 11 19:46:35 2014 |
diego | Update | Computer Scripts / Programs | Status of the new nodus | The new nodus machine is being brought
to life; until installation is finished and
everything is fine, the old nodus will be |
|
|
10696
|
Tue Nov 11 03:48:46 2014 |
Jenne | Update | LSC | 3f DRMI | I was
able to lock the DRMI on 3f signals this
evening, although the loops are not stable, |
|
|
10695
|
Tue Nov 11 01:38:23 2014 |
Koji | Update | LSC | Notch at 110MHz | To further reduce the RF power at 110MHz
in the REFL165 chain, I made a twin-t notch
in a pomona box. |
|
|
10694
|
Mon Nov 10 23:14:20 2014 |
rana | Summary | SUS | SRM: damping gains & Optical Lever servo Tune-up |
tweaked gains for POS,
PIT, YAW, SIDE by ~10-20% to get nice ringdowns
with Q~5.
Measured bounce rool |
|
|
10693
|
Mon Nov 10 18:23:10 2014 |
ericq | Configuration | LSC | DRMI sensing | ARG, I accidentally permuted the digital
demod angles. This significantly weakens
the argument for believing AS55I is broken... |
|
|
10692
|
Mon Nov 10 18:11:57 2014 |
ericq | Update | LSC | 3F RFPD RF spectra | Jenne and I measured the situation
using a SHP-150 directly attached to the
REFL165 RF output, and at first glance, the |
|
|
10691
|
Mon Nov 10 07:36:35 2014 |
Steve | Update | SUS | PRM damping recovered | PRM sus damping recovered and PMC locked. |
|
|
10690
|
Sat Nov 8 16:01:32 2014 |
ericq | Configuration | LSC | DRMI sensing | Here are some preliminary results from
the sensing sweeps I did the other night.
Notes: |
6x |
|
10689
|
Sat Nov 8 11:35:05 2014 |
rana | Update | LSC | 3F RFPD RF spectra |
I think 'saturation'
here is a misleading term to think about. |
|
|
10688
|
Sat Nov 8 11:31:51 2014 |
rana | Update | Computer Scripts / Programs | Anaconda + CDSutils |
|
|
|
10687
|
Fri Nov 7 17:44:10 2014 |
diego | Update | LSC | IR Resonance Script Status | Yesterday I did some more tests with a
modifies script; the main difference is that
scipy's default wavelet implementation is |
|
|
10686
|
Fri Nov 7 16:15:53 2014 |
Jenne | Update | LSC | 3F RFPD RF spectra | I have found an SHP-150, but no SHP-175's
(also, several 200's, and a couple of 500's).
Why do you say the SHP-150 isn't |
|
|
10685
|
Fri Nov 7 14:41:18 2014 |
ericq | Update | LSC | 3F RFPD RF spectra |
|
|
|
10684
|
Fri Nov 7 10:29:56 2014 |
Steve | Update | General | He/Ne telescope |
|
|
|
10683
|
Fri Nov 7 02:21:12 2014 |
ericq | Update | LSC | 3F RFPD RF spectra |
After some enlightening conversation
with Koji, we figured that the RF amplifier |
|