ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
9698
|
Thu Mar 6 11:15:32 2014 |
Koji | Summary | LSC | Stuck at step 2 | You don't need to make transition from
ALS X/Y to ALS C/D. Just stabilize the arms
with ALS C/D from the beginning. |
|
9708
|
Mon Mar 10 21:12:30 2014 |
Koji | Summary | LSC | Composite Error Signal for ARms (1) | The ALS error (i.e. phase tracker output)
is linear everywhere, but noisy.
The 1/sqrt(TR) is linear and less |
|
9711
|
Mon Mar 10 21:16:13 2014 |
Koji | Summary | LSC | Composite Error Signal for ARms (4) | The LSC model was modified for CESAR.
A block called ALSX_COMBINE was made
in the LSC block. This block receives the |
  |
9712
|
Mon Mar 10 21:16:56 2014 |
Koji | Summary | LSC | Composite Error Signal for ARms (5) | After making the CDS modification, CESAR
was tested with ALS.
First of all, we run CESAR with threshold |
|
9713
|
Tue Mar 11 14:49:01 2014 |
Koji | Summary | LSC | Important notice on the XARM servo | The nominal gain
of the XARM for the POX11 error signal is |
|
9717
|
Tue Mar 11 15:21:08 2014 |
Koji | Summary | LSC | Composite Error Signal for ARms (1) | True. But we first want to realize this
for a single arm, then move onto the two
arms case. |
|
9718
|
Tue Mar 11 18:33:21 2014 |
Koji | Update | LSC | Composite Error Signal for ARms (6) | Today we modified the CESAR block.
- Now the sign(X) function is in
a block. |
|
9728
|
Fri Mar 14 12:18:55 2014 |
Koji | Update | LSC | Composite Error Signal for ARms (9) | Asymptotic cooling of the mirror motion
with CESAR was tested.
With ALS and the full control bandwidth |
|
9731
|
Mon Mar 17 12:02:55 2014 |
Koji | Summary | General | IFO recovery / confirmed ETMX in trouble | I
confirmed that we need to vent the chambers.
|
|
9733
|
Mon Mar 17 20:14:34 2014 |
Koji | Summary | General | IFO recovery / confirmed ETMX in trouble | I tried to take the photos of the magnets
from outside. So far most suspicious was
LL. |
   |
9735
|
Mon Mar 17 21:55:36 2014 |
Koji | Update | SUS | 4.4M local earthquake | It was little bit surprising to me but
Rana's
professorial rock'n roll excitation released |
|
9739
|
Tue Mar 18 21:19:22 2014 |
Koji | Summary | IOO | MC spot positions checked | MC spot sposition script was ran
/opt/rtcds/caltech/c1/scripts/ASS/MC/mcassMCdecenter |
|
9747
|
Mon Mar 24 21:36:28 2014 |
Koji | Update | General | Power Failure | I'm checking the status from home.
P1 is 8e-4 torr
nodus did not feel the power outage |
|
9750
|
Tue Mar 25 16:11:24 2014 |
Koji | Update | General | Power Failure | As far as I know the system is running
as usual. I had the IMC locked and one of
the arm flashing. |
|
9752
|
Wed Mar 26 11:30:07 2014 |
Koji | Update | General | Power Failure | Recovery work: now arms are locking as usual
- FB is failing very frequently. |
|
9753
|
Wed Mar 26 14:54:32 2014 |
Koji | Summary | LSC | PRMIsb locked with REFL165I&Q again | [Manasa, Eric, Koji]
PRMIsb
was locked with REFL165I&Q. |
|
9758
|
Fri Mar 28 17:22:55 2014 |
Koji | Summary | LSC | PRMIsb locked with REFL165I&Q again | While I'm looking at the PRM ASC servo
model, I tried to use the current servo
filters for the ASC |
|
9761
|
Fri Mar 28 23:28:13 2014 |
Koji | Configuration | General | NTP setting on nodus | [Koji Rana]
We are looking at NTP settings. I
looked at nodus. |
|
9762
|
Sat Mar 29 00:11:39 2014 |
Koji | Configuration | General | NTP setting on nodus | FB: /etc/ntp.conf was updated as
below such that it refers nodus and also
caltech server when nodus is not available |
|
9769
|
Mon Mar 31 23:57:22 2014 |
Koji | Summary | ASC | PRM ASC characterization / design | A
series of measurements / calculations for
the PRM ASC characterization and servo design |
7x |
9773
|
Tue Apr 1 22:03:44 2014 |
Koji | Summary | ASC | New PRM ASC is running | [Koji Jenne]
New PRM ASC was implemented. [to
be cnt'd] |
|
9777
|
Wed Apr 2 19:50:12 2014 |
Koji | Summary | ASC | New PRM ASC is running | As the designed ASC filters in this
entry had too little phase margins (~10deg),
I had to compromise the servo design. |
|
9779
|
Wed Apr 2 23:08:51 2014 |
Koji | Summary | ASC | New PRM ASC is running | The new PRM ASC design
Pitch
FM1: zero at 0Hz, pole at 2000Hz, |
 |
9788
|
Tue Apr 8 10:44:53 2014 |
Koji | Update | LSC | Playing with PRMI + 2 arms | I vaguely remember that the ALS count (Phase
Tracker output) is converted to Hz@532nm
by a factor ~20kHz/cnt. |
|
9800
|
Fri Apr 11 12:21:27 2014 |
Koji | Update | LSC | CARM and DARM both on IR signals!!!!!!!!! | About the ADC range,
According to the elogs, DARM = AS55Q/400.
So in the current level, the error has +/-40cntpp |
|
9803
|
Fri Apr 11 16:04:31 2014 |
Koji | Update | LSC | congratulation | It's
just one of the stepping stones, but not
yet a mile stone. |
|
9812
|
Tue Apr 15 08:55:57 2014 |
Koji | Update | LSC | Analog phasing of REFL11 and REFL55 | I have never used such a long cable for
RF phase adjustment. The speed of the signal
is 2e8 m/s and the frequency is ~10e6 Hz. |
|
9815
|
Tue Apr 15 16:21:18 2014 |
Koji | Update | IOO | MC2 LSC offset was set to be -5000 | Yesterday, MC2 alignment was slipping all
day. Even when the WFS was off (i.e. there
wa sno actuation), I had continual misalignment |
|
9847
|
Thu Apr 24 11:19:50 2014 |
Koji | Update | LSC | Locking without TRY | This seems the ever best stability at the
zero offset PRFPMI.
Can you look at REFLDC in this data |
|
9852
|
Thu Apr 24 23:55:31 2014 |
Koji | Update | LSC | Y end whitening board | The main problem was a panel fixing bolt
that caused the short circuits between power |
|
9854
|
Fri Apr 25 10:43:57 2014 |
Koji | Update | LSC | (Fixed) Y end whitening board | I went to WB and found the last spare
module of D990399 revB. We need to thank
Frank for his foresight. |
   |
9860
|
Sun Apr 27 20:26:19 2014 |
Koji | Update | LSC | Phase Tracker servo characterization | The measured open loop TF of the ALS Phase
Tracker loop for each arm was characterized
by an empirical model on LISO. |
 |
9861
|
Sun Apr 27 21:30:59 2014 |
Koji | Update | LSC | ALS servo characterization | The measured openloop TF of the ALS servo
for each was characterized by a ZPK model.
The openloop TF can be modeled by: |
 |
9862
|
Mon Apr 28 10:24:10 2014 |
Koji | Update | LSC | error signal characterization | As we now have the loop model, we can characterize
the error signals.
We have the following data: |
 |
9863
|
Mon Apr 28 10:34:51 2014 |
Koji | Update | LSC | new ALS servo design | Based on the evaluation of the error signals,
the new servo was designed.
Concept: |
 |
9864
|
Mon Apr 28 10:48:48 2014 |
Koji | Update | LSC | new ALS servo design: comparison | Comparison of the new and old servo
OLTF
The new servo has the same UGF, slightly |
 |
9865
|
Mon Apr 28 10:59:54 2014 |
Koji | Update | LSC | New ALS servo design: expected error signals | The expected error signals derived from
the estimated free running error signals
of the ALS. |
 |
9866
|
Mon Apr 28 11:03:57 2014 |
Koji | Configuration | LSC | New ALS servo implemented for the X arm | The
new ALS/LSC servo was implemented for the
X arm. |
|
9867
|
Mon Apr 28 11:08:11 2014 |
Koji | Update | LSC | New ALS servo design: expected error signals | Here are the MATLAB scripts and LISO codes
for all of these servo analyses |
|
9874
|
Tue Apr 29 01:10:16 2014 |
Koji | Configuration | LSC | New ALS servo implemented for the X arm | New ALS servo performance
Attachment 1:
Comparison between the old ( |
 |
9875
|
Tue Apr 29 10:01:25 2014 |
Koji | Configuration | General | netgpibdata is working again now | I've moved the WB network analyzer to the
OMC lab. The 40m network analyzer is not
in service for the MC monitoring. |
|
9887
|
Thu May 1 00:13:21 2014 |
Koji | Update | LSC | ALS X beat setup aligned | I saw big misalignment on the GTRX camera,
I went to the PSL table and aligned the beat
beams. |
|
9905
|
Fri May 2 14:31:26 2014 |
Koji | Update | LSC | ALS Y beat setup aligned | Please check the X&Y ALS out-of-loop
stability. Use fine resolution (BW0.01).
Calibrate the POX/POY in Hz. |
|
9939
|
Fri May 9 21:18:51 2014 |
Koji | Update | Green Locking | Reverted X green light power | It is actually very tricky to measure the
green power at the output of the doubling
crystal as the IR often leaks into the measurement. |
|
9992
|
Mon May 26 07:59:23 2014 |
Koji | Update | Electronics | Amplifier removed from BeatX path | And the out-of-loop level of the ALSX compared
with the previous measurement is ...?
|
|
10001
|
Wed May 28 19:15:38 2014 |
Koji | Update | LSC | X green broadband PD NOT working | If the PD is the suspect, just pull it
from the table and bring it to the PD testing
setup. |
|
10004
|
Thu May 29 14:40:17 2014 |
Koji | Update | LSC | High Bandwidth power recycled Yarm. | Wait. It is not so clear.
Do you mean that the IFO was locked
with REFL11I for the first time? |
|
10012
|
Mon Jun 9 16:55:31 2014 |
Koji | Summary | Electronics | BBPD D1002969-v8 transimpedence measurement | How is the modulation depth assumed in
the calculation?
If you don't know the modulation |
|
10031
|
Thu Jun 12 11:03:11 2014 |
Koji | Frogs | General | World Cup Soccer 2014 | |
|
10038
|
Fri Jun 13 19:09:44 2014 |
Koji | Update | IOO | A blown fuse found on the euro card crate at 1X2 (IOO) rack. | [Rana Zach Koji]
We tracked down the MC locking issue
to be associated with the power supply problem. |
|