| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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. |
|
|
6971
|
Thu Jul 12 21:17:44 2012 |
Masha | Update | PEM | Gurlap 2 Problems | I noticed on DataViewer today that GUR2
was outputting only noise (somewhere around
2 counts). Jenne suggested that GUR 2 might |
|
|
6970
|
Thu Jul 12 16:27:04 2012 |
steve | Update | VAC | drypump changed | TP2 dry_pump was changed at intake
pressure 982 mTorr at 84,889 hrs This
seal hold up for one year. |
|
|
6969
|
Thu Jul 12 15:43:07 2012 |
Yaakov | Update | STACIS | New input point, using accelerometers for feedback | Here's a picture of where I am now
inputting signals into the STACIS with the
accelerometers (the orange and blue wires): |
|
|
6968
|
Thu Jul 12 15:25:24 2012 |
Jenne | Update | SUS | Clearing test points | Somehow we got an excitation going on BS
OpLevs, and even though Yuta thought he might
have accidentally started it, he couldn't |
|
|
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 |
|
|
6966
|
Thu Jul 12 11:55:00 2012 |
Jenne | Update | Green Locking | New BS mounts for PSL beats - Y is finished | Yuta and I bought some new BS mounts so
that we could use the 4th port of the beamsplitters
which are combining the PSL green and the |
|
|
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 |
|
|
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 |
|
|
6963
|
Wed Jul 11 14:27:29 2012 |
Yaakov | Summary | STACIS | Current STACIS Status | The X and Y directions in the STACIS still
both oscillate uncontrollably in closed loop,
so I'll be doing my testing in Z for now. |
|
|
6962
|
Wed Jul 11 14:22:54 2012 |
Eric | Summary | General | SURF Update | Here's
what I accomplished since my last elog: |
|
|
6961
|
Wed Jul 11 13:45:01 2012 |
Jenne | Update | PEM | more seismic noise next week |
|
|
|
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 |
|
|
6959
|
Wed Jul 11 11:18:21 2012 |
steve | Update | PEM | more seismic noise next week |
The fabricators
of the big flume in the CES lab have begun
testing the sediment feed system which is |
|
|
6958
|
Wed Jul 11 11:00:45 2012 |
Masha | Summary | General | Week Summary | This week, my work fell into two categories:
Artificial Neural Networks and lab-related
projects. |
|
|
6957
|
Wed Jul 11 10:17:18 2012 |
Sasha | Summary | Simulations | SURF - Week 2 and 3 - Summary | These past two weeks, I've been working
on simulating a basic |
6x |
|
6956
|
Wed Jul 11 09:48:24 2012 |
Liz | Summary | Computer Scripts / Programs | Update/daily summary testing | I have been
working on configuration of the Daily Summary
webpages and have been attempting to create |
|
|
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. |
|
|
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;
|
|
|
6953
|
Tue Jul 10 21:37:05 2012 |
yuta | Update | LSC | PRMI glitch study | PRMI
glitch certainly comes from power recylcing
gain fluctuation. |
|
|
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 |
|
|
6951
|
Tue Jul 10 10:50:02 2012 |
Jamie | Configuration | General | Seismometer repositioning |
|
|
|
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 |
|
|
6949
|
Tue Jul 10 01:52:47 2012 |
Koji | Update | LSC | PRMI got more stable a bit | The phase margins looks still too small.
Do You need such high gain at LF?
This is not a high finesse cavity so can |
|
|
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 |
|
|
6946
|
Mon Jul 9 16:28:13 2012 |
Masha | Configuration | General | Seismometer repositioning | Today I REPOSITIONED
THE SEISMOMETERS |
|
|
6945
|
Mon Jul 9 15:05:00 2012 |
Jenne | Update | PEM | Seismometers being moved, new safety shower | [Masha, Jenne]
Masha is moving the seismometers,
so they are all off right now. Were |
|
|
6944
|
Mon Jul 9 11:27:27 2012 |
Jenne | Update | Computers | c1oaf has been down for several days - BURT restore wasn't done correctly on startup | The c1oaf model hasn't been running for
a few days (since the leap second problems
we were having last week). I had looked |
|
|
6943
|
Mon Jul 9 10:52:48 2012 |
Masha | Update | PEM | StripTools on Wall | The RMS signals generated by the updated
filtering process are now on the wall. The
NaN issue is gone it seems, and the template |
|
|
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, |
|
|
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 |
|
|
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. |
|
|
6939
|
Sun Jul 8 00:58:08 2012 |
Koji | Summary | Locking | calibrating phase tracking mode scan data |
|
|
|
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 |
|
|
6936
|
Sat Jul 7 17:28:11 2012 |
Masha | Update | PEM | PEM no longer freaking out (as much). |
|
|
|
6935
|
Sat Jul 7 16:34:41 2012 |
Masha | Update | PEM | PEM no longer freaking out (as much). | Hi everybody,
Sorry for flooding the ELOG about
the PEM channels. Today I |
|
|
6934
|
Sat Jul 7 15:48:00 2012 |
Masha | Update | PEM | Current PEM status |
|
|
|
6933
|
Fri Jul 6 22:30:14 2012 |
Masha | Update | PEM | Current PEM status |
|
|
|
6932
|
Fri Jul 6 20:54:54 2012 |
Masha | Update | PEM | Current PEM status | Hi everybody,
Last night I (with the help of Jenne
and Jenne's advice - not to implicate her |
|
|
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. |
|
|
6930
|
Fri Jul 6 09:52:35 2012 |
steve | Update | VAC | pump down hick up | I can not understand what really
happened here with CC1 gauge or there was
really a pressure glitch. |
|
|
6929
|
Fri Jul 6 09:27:40 2012 |
steve | Update | VAC | 4 days at atm | I'm looking for some movement indicators
of the vent-pump down events.
|
|
|
6928
|
Fri Jul 6 09:00:34 2012 |
not Zach | Update | Computers | NDS2 client now working on Ubuntu machines |
|
|
|
6927
|
Fri Jul 6 08:38:04 2012 |
steve | Update | Computers | time out | Why do we have these timing blanks? |
|
|
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 |
|
|
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 |
|
|
6924
|
Fri Jul 6 01:12:02 2012 |
Jenne | Update | Computers | c1sus is fine |
|
|
|
6923
|
Thu Jul 5 16:49:35 2012 |
Jenne | Update | Computers | c1sus is funny | I was trying to use a new BLRMs c-code
block that the seismic people developed,
instead of Mirko's more clunky version, but |
|
|
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. |
|
|
6921
|
Thu Jul 5 13:12:12 2012 |
Zach | Update | Computers | NDS2 client now working on Ubuntu machines | From my conversations with JZ and Leo,
it seemed there was no package that generated
the appropriate mex files. It was clear that |
|