| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
6922
|
Thu Jul 5 13:38:05 2012 |
yuta | Summary | Locking | cavity g-factor from mode scan | Cavity
g-factor for X arm is 0.3737 +/- 0.002, Y
arm is 0.3765 +/- 0.003. |
|
|
6925
|
Fri Jul 6 01:39:56 2012 |
yuta | Update | Locking | MI + Y arm ALS succeed, but not both | MI with X arm length stabilized off resonance
and Y arm length stabilized at resonance
using ALS succeed, but I couldn't bring X |
|
|
6926
|
Fri Jul 6 02:46:03 2012 |
yuta | Update | Locking | Y arm ALS handing off to LSC | Handing off the servo from ALS to LSC for
one arm is quite easy because servo filters
are pretty much same for ALS and LSC. I demonstrated |
|
|
6931
|
Fri Jul 6 14:10:31 2012 |
yuta | Summary | LSC | calculation of FPMI using ALS | From calculation, phase fluctuation of
reflected beam from length stabilized arm
is not disturbing MI lock. |
|
|
6938
|
Sun Jul 8 00:27:54 2012 |
yuta | Summary | Locking | calibrating phase tracking mode scan data | FSR
for X/Y arm are 3.97 +/- 0.03 MHz and 3.96
+/- 0.02 MHz respectively. This |
|
|
6940
|
Sun Jul 8 19:31:53 2012 |
yuta | Update | Locking | characterizing LSC arm lock by ALS error signal | RMS
of X/Y arm length using POX/POY lock is <160
pm and <120 pm respectively. |
|
|
6941
|
Mon Jul 9 05:02:58 2012 |
yuta | Update | Locking | adjusted ALS filters, current RMS | I adjusted filters of ALS to give more
phase margin.
RMS |
|
|
6942
|
Mon Jul 9 05:15:46 2012 |
yuta | Update | Green Locking | locked MI while ALS using ASDC | I locked MI while both arm length are stabilized
at IR resonance. This could be done using
DC READOUT, |
|
|
6947
|
Mon Jul 9 23:18:09 2012 |
yuta | Update | LSC | PRMI got more stable a bit | I modified filiters for LSC_MICH and LSC_PRCL.
Although modes we can see at POP and
AS look still bad, error signals are less |
|
|
6950
|
Tue Jul 10 03:16:17 2012 |
yuta | Update | LSC | PRMI got more stable a bit | I modified filiters for LSC_MICH and LSC_PRCL
again to cope with power recycling gain fluctuation.
After some more alignment, power recycling |
|
|
6952
|
Tue Jul 10 17:47:55 2012 |
yuta | Update | SUS | PRM oplevs fixed | I centetered PRM oplev, lowered gain and
PRM oplev servo is not oscillating any more.
It is OK for more than a softball |
|
|
6953
|
Tue Jul 10 21:37:05 2012 |
yuta | Update | LSC | PRMI glitch study | PRMI
glitch certainly comes from power recylcing
gain fluctuation. |
|
|
6954
|
Wed Jul 11 02:25:11 2012 |
yuta | Update | LSC | PRMI beam spot motion might be from PRM/BS motion | My hypothesis from the measurements below,
to explain PRMI beam spot motion is;
|
|
|
6955
|
Wed Jul 11 03:53:41 2012 |
yuta | Update | LSC | BS 3.3 Hz motion on MI | It is not as dramatic as PRMI, but I could
see BS 3.3 Hz motion at AS and REFL when
MI is locked at dark fringe. |
|
|
6960
|
Wed Jul 11 13:36:58 2012 |
yuta | Update | SUS | OSEM and oplev spectra of optics | Below is angular spectra of every suspended
core optics.
As you can see, there's a peak at |
|
|
6964
|
Wed Jul 11 16:19:08 2012 |
yuta | Update | SUS | oplev servo phiology | I heard that Steve did great work on oplev
in Feb 2012.
Here's summary what happened to oplev |
|
|
6965
|
Thu Jul 12 02:12:42 2012 |
yuta | Update | SUS | BS 3.3 Hz motion | I tried to reduce BS 3.3 Hz motion with
local damping. 3.3 Hz probably comes from
the stack, but I want to reduce this because |
|
|
6967
|
Thu Jul 12 13:27:16 2012 |
yuta | Update | SUS | measured OLTFs of PRMI optics' SUSPOS | I measured openloop transfer functions
of PRM/BS/ITMX/ITMY SUSPOS servo.
They look great. They all have ~50 |
|
|
6972
|
Thu Jul 12 23:15:34 2012 |
yuta | Update | LSC | PRMI LSC is making PRM motion worse | It looks like PRMI LSC is making PRM motion (and
BS motion) at ~3Hz worse. |
|
|
6974
|
Fri Jul 13 15:49:38 2012 |
yuta | Bureaucracy | General | 40m Priority Action Items | These are all priority action items need
to be done before I come back (in mid-September).
|
|
|
7994
|
Mon Feb 4 19:33:19 2013 |
yuta | Summary | General | rough analysis of aligned PRM-PR2 mode scan | [Jenne, Yuta]
We redid PRM-PR2 cavity scan because |
|
|
7997
|
Tue Feb 5 02:04:44 2013 |
yuta | Summary | General | rough analysis of aligned PRM-PR2 mode scan | I redid PRM-PR2 cavity scan using oscilloscope
to avoid anti-aliasing effect.
Measured |
|
|
8000
|
Tue Feb 5 10:09:08 2013 |
yuta | Summary | General | rough analysis of aligned PRM-PR2 mode scan | stdev of [0.764, 0.751] is 0.007, but what
we need is the error of the averaged number.
Statistical error of the averaged number |
|
|
8006
|
Tue Feb 5 19:32:47 2013 |
yuta | Summary | General | PR2/PR3 flipping and PRC stability | We are considering of flipping PR2 and/or
PR3 to make PRMI stable because PR2/PR3 seems
to be convex. |
|
|
8012
|
Wed Feb 6 15:20:55 2013 |
yuta | Summary | General | FWHM was wrong | I have to blame Jamie for putting extra
2 randomly.
Measured PRM-PR2 cavity |
|
|
8021
|
Thu Feb 7 10:35:35 2013 |
yuta | Update | General | Store optics in respective cabinets | I'm not the one who opened the ITMX table
yesterday, but thanks for reminding me.
I put POP DC oscilloscope and its |
|
|
8028
|
Thu Feb 7 19:25:22 2013 |
yuta | Update | CDS | C1ALS filters reloaded | Filters for C1ALS were all gone. So, I
copied /opt/rtcds/caltech/c1/chans/C1GCV.txt
and renamed it as |
|
|
8034
|
Fri Feb 8 12:39:32 2013 |
yuta | Update | Locking | PRMI work | Half-PRC at this time already have two
changes from the previous half-PRC; PR2 replaced/flipped
and different TM before BS. |
|
|
8036
|
Fri Feb 8 12:43:26 2013 |
yuta | Update | Computers | videocapture.py now supports movie capturing | I updated /opt/rtcds/caltech/c1/scripts/general/videoscripts.py
so that it supports |
|
|
8041
|
Fri Feb 8 19:29:44 2013 |
yuta | Summary | General | arbcav of half PRC with flipped PR2 | We need expected finesse and g-factor to
compare with mode-scan measurement. Can you
give us the g-factor of the half-PRC and |
|
|
8049
|
Fri Feb 8 23:59:42 2013 |
yuta | Update | Locking | PR2-flipped half-PRC mode scan | I did mode scan of PR2-flipped half-PRC
to see if it behaves as we expect.
Measured |
|
|
8052
|
Sun Feb 10 17:30:39 2013 |
yuta | Update | Locking | PR2-flipped half-PRC mode scan | I redid half-PRC mode scan by applying
mislignment to PRM.
Half-PRC's |
|
|
8053
|
Sun Feb 10 18:00:13 2013 |
yuta | Summary | LSC | PR2-flipped half-PRC spectra/OLTF | To compare with future PRMI locking, I
measured spectra of POPDC and feedback signal.
I also measured openloop transfer function |
|
|
8056
|
Mon Feb 11 13:15:16 2013 |
yuta | Update | Locking | PR2-flipped half-PRC mode scan | I found a mistake in my code (thanks Jamie!).
I forgot to square the g-factor.
I corrected the following elogs; |
|
|
8064
|
Mon Feb 11 21:03:15 2013 |
yuta | Update | Locking | PR2-flipped half-PRC mode scan | To estimate the systematic effects to the
g-factor measurement, I changed how to analyze
the data in multiple ways. |
|
|
8065
|
Tue Feb 12 00:14:00 2013 |
yuta | Update | Locking | PRM coil balancing | We tried to lock half-PRC tonight, but
we couldn't. Why?? I could lock yesterday.
It locks for ~ 1 sec, but it beam |
|
|
8066
|
Tue Feb 12 00:50:08 2013 |
yuta | Update | Locking | PR2 oplev spectra | I wanted to see if PR2 motion makes PRC
beam motion or not, using temporary oplev
to PR2. |
|
|
8073
|
Tue Feb 12 23:24:17 2013 |
yuta | Update | Alignment | IFO alignment in prep for in-air PRMI | [Manasa, Yuta]
Lot's of alignment work, |
|
|
8074
|
Wed Feb 13 01:26:08 2013 |
yuta | Summary | General | rough analysis of aligned PRM-PR2 mode scan | Koji was correct.
When you estimate the variance of |
|
|
8078
|
Wed Feb 13 19:09:32 2013 |
yuta | Summary | General | possible explanations to oval REFL beam | [Jenne, Manasa, Jamie, Yuta]
The shape of the REFL beam reflected |
|
|
8080
|
Wed Feb 13 19:41:07 2013 |
yuta | Summary | General | possible explanations to oval REFL beam | We checked that REFL beam is already oval
in the vacuum. We also centered in-air optics,
including lens, in the REFL path, but REFL |
|
|
8082
|
Thu Feb 14 00:10:12 2013 |
yuta | Summary | Alignment | REFL is not clipped | Let's wait for astigmatism calculation.
In either case(clipping or astigmatism), |
|
|
8091
|
Fri Feb 15 20:07:28 2013 |
yuta | Update | Alignment | POP path set up but AS55 is broken | [Manasa, Yuta]
We set up POP camera and POPDC PD, |
|
|
8092
|
Fri Feb 15 21:22:29 2013 |
yuta | Update | Electronics | AS55 replaced with POP55 PD | I temporarily replaced AS55 PD with PD
labeled "POP55(POY55)".
I think POP55 is working because I |
|
|
8093
|
Sat Feb 16 17:27:26 2013 |
yuta | Update | SUS | PRM coil balanced | PRM coil gains and f2a filters are adjusted
for PRMI work.
It seems like |
|
|
8094
|
Sat Feb 16 18:32:01 2013 |
yuta | Summary | RF System | phase tracker: OLTF | I measured openloop transfer function of
the phase tracking loop for the first characterization
of phase tracker. |
|
|
8095
|
Sat Feb 16 19:23:17 2013 |
yuta | Update | LSC | PR2 flipped PRMI locked | It is my pleasure to announce that the
first lock of PR2 flipped PRMI was succeeded.
|
|
|
8099
|
Mon Feb 18 18:28:01 2013 |
yuta | Bureaucracy | Alignment | we are going to pump down | We
will start preparing for pumping down. Main
goal for this is to demonstrate PRFPMI using |
|
|
8102
|
Tue Feb 19 00:21:09 2013 |
yuta | Update | Electronics | POP path set up but AS55 is broken | Hmm......
I thought AS55 is broken because it
was not responding to the AS beam nor flashlight |
|
|
8103
|
Tue Feb 19 02:23:40 2013 |
yuta | Bureaucracy | General | action items for PRFPMI | These are things need to be done for demonstrating
PRFPMI using ALS.
All of these should be done before |
|