| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
975
|
Mon Sep 22 12:06:58 2008 |
rob | Update | SUS | ITMY UL OSEM |
Last week I found the ITMY UL OSEM dead. |
|
|
978
|
Mon Sep 22 18:54:54 2008 |
Jenne | Update | PSL | PMC transfer functions with various brick-on-top configurations | Attached below is a graphical summary of different
things that I have tried putting on the PMC
to reduce the noise in the loop. The motivation |
|
|
979
|
Mon Sep 22 20:00:35 2008 |
Alberto | Update | General | ABSL: running measurement | I'm leaving the X arm locked on the TEm01
mode while a measurement is running. Just
please wait for 40 minute if you need the |
|
|
981
|
Mon Sep 22 21:54:05 2008 |
rana | Update | ASS | New Wiener result with x10 gain in ACC | The 2 attached PDF files show the performance
of the Wiener filter code on 2 hours of data
with a 4000 tap filter on 64 Hz data. All |
|
|
984
|
Tue Sep 23 11:17:59 2008 |
steve | Update | PSL | PMC scattering spot | The PMC output side has a new madly scattering
spot at chamfer 2 o'clock position |
|
|
985
|
Tue Sep 23 13:25:07 2008 |
rob | Update | Locking | a bit better | I've been spending time working on the short
DOF loops (PRC,MICH,SRC) in an attempt to
make the
|
|
|
987
|
Wed Sep 24 17:57:04 2008 |
Alberto | Update | General | ABSL: FSS Slow Actuator Control | Rana, Alberto
Today when I started working with the PLL |
|
|
991
|
Thu Sep 25 10:48:29 2008 |
Yoichi | Update | PSL | FSS calibration again | I did a calibration of the FSS error signal
again with a different method.
This time, I swept the laser frequency with |
|
|
993
|
Thu Sep 25 15:24:05 2008 |
Yoichi | Update | IOO | MC_F VCO calibration | I calibrated the VCO driving the AOM for the
AO path of the MC feedback.
|
|
|
995
|
Fri Sep 26 00:19:54 2008 |
Jenne | Update | PSL | Filter-action with the PMC | Written, but not posted on 24Sept2008:
|
|
|
996
|
Fri Sep 26 09:05:47 2008 |
steve | Update | SUS | MC2 damping restored | The MC2 sus damping was restored. |
|
|
998
|
Fri Sep 26 16:08:39 2008 |
rob | Update | Locking | some progress | There's been good progress in locking the
last couple of nights. A lot of time was
wasted before I found that
|
|
|
999
|
Fri Sep 26 16:13:57 2008 |
rana | Update | IOO | MC_L / MC_F crossover | We were trying to understand why the FAST_F
signal had such large excursions (~1V ~ 5
MHz).
|
|
|
1000
|
Fri Sep 26 18:35:17 2008 |
Jenne | Update | PSL | PMC filter is out for tuning | The PMC's new Pomona Box filter is out for
tuning. I'd like to get the notch right
on the 18.3kHz, rather than being off in |
|
|
1002
|
Fri Sep 26 19:18:39 2008 |
Jenne | Update | IOO | MC2 is having a bad day | As Steve mentioned earlier in today's elog,
MC2 keeps ringing up for no clear reason.
It is definitely only MC2 that is ringing |
|
|
1004
|
Mon Sep 29 11:17:14 2008 |
steve | Update | SAFETY | horizontal viewports are protected with lexan | The four horizontal viewports of arms are
protected
by 3/8" thick, 8.5" OD Lexan disk of MR10 |
|
|
1007
|
Mon Sep 29 15:09:36 2008 |
steve | Update | PSL | almost 4 yrs plot of power & temps | The water chiller is normally running 1.5
C warmer than the laser head temp.
When control room temp is stable and PEM-count_temp |
|
|
1008
|
Mon Sep 29 17:53:33 2008 |
Yoichi | Update | PSL | ISS update | ISS has been saturating easily.
Today I opened the PSL enclosure to inspect
the ISS box. Then I found that the sensor |
|
|
1009
|
Tue Sep 30 13:43:43 2008 |
rob | Update | Locking | last night | Steady progress again in locking again last
night. Initial acquisition of DRMI+2ARMs
was working well.
|
|
|
1010
|
Tue Sep 30 19:50:27 2008 |
Jenne | Update | PSL | Quicky Summary - more details later | Quicky summary for now, more details later
tonight / tomorrow morning:
|
|
|
1011
|
Wed Oct 1 00:24:54 2008 |
rana | Update | Locking | last night | I had mistakenly left the MC boost off during
my FAST investigations. The script is now
restored.
|
|
|
1012
|
Wed Oct 1 02:10:03 2008 |
rana | Update | IOO | MZ is going bad | Here's a 2 day trend of the MZ. You can see
that there is something bad with ERR - it
should really be going to zero.
|
|
|
1013
|
Wed Oct 1 02:47:53 2008 |
rana | Update | PSL | PSL ERR & LODET: Too much offset | Looks like there is an anomolous mixer offset
correlated with the increase in the LO level.
This may be leading to crazy offset locking |
|
|
1014
|
Wed Oct 1 02:54:03 2008 |
rob | Update | Locking | bad |
Tried the spring-y side tonight with a discouraging
lack of progress. There were several locks |
|
|
1017
|
Wed Oct 1 23:05:14 2008 |
Yoichi | Update | PSL | ISS RIN spectra | Stefan, Yoichi
We took relative intensity noise (RIN) spectra |
|
|
1019
|
Thu Oct 2 02:45:50 2008 |
rob | Update | Locking | marginally better | Locking the DRMI with the +f2 sideband was
marginally better tonight. I was able to
get it lock stably enough to take transfer
|
|
|
1023
|
Fri Oct 3 15:09:58 2008 |
rob | Update | PSL | FAST/SLOW |
Last night during locking, for no apparent
reason (no common mode), the PSL FAST/SLOW |
|
|
1024
|
Fri Oct 3 15:57:05 2008 |
rob | Update | Locking | last night, again | Last night was basically a repeat of the night
before--marginally better locking with the
DRMI resonating the +f2
|
|
|
1027
|
Mon Oct 6 10:00:49 2008 |
steve | Update | MOPA | MOPA_HTEMP is up | Monday morning conditions:
The laser head temp is up to 20.5 C
|
|
|
1030
|
Tue Oct 7 10:49:29 2008 |
Alberto | Update | General | Displaced Photodiode | This morning I found that the photodidode
of the PLL in the PSL table was not aligned
to the beam anymore. The PD support was not |
|
|
1032
|
Tue Oct 7 21:19:40 2008 |
Yoichi | Update | IOO | MC_F calibrated spectrum | [COLOR=darkred]I updated the plots because
I did not take into account the double path
AOM effect, which doubles the frequency actuation |
|
|
1035
|
Wed Oct 8 21:26:20 2008 |
Yoichi | Update | PSL | Attempt to replace the DC-DC converter (aborted) | Rich, Steve, Yoichi
We opened the MOPA box and inspected our |
|
|
1037
|
Wed Oct 8 23:18:23 2008 |
Yoichi | Update | PSL | Correlation between the Sorensen switching noise and the FSS error signal | I took some spectra and coherence function
of the FSS error signal and the +24V Sorensen
power line.
|
|
|
1042
|
Mon Oct 13 11:32:50 2008 |
Yoixhi | Update | PSL | MOPA is in trouble now | Steve, Alberto, Yoichi
A quick update.
|
|
|
1044
|
Mon Oct 13 13:56:03 2008 |
Yoichi | Update | PSL | MOPA is not that much in trouble now | The problem was found to be all to do with
the shutter.
The shutter started to work again, after |
|
|
1045
|
Mon Oct 13 18:59:39 2008 |
Yoichi | Update | PSL | NPRO EMI and FSS error signal correlation | I made a simple loop antenna to measure the
electro-magnetic inteference (EMI) around
the master oscillator NPRO.
|
|
|
1047
|
Tue Oct 14 19:18:18 2008 |
Yoichi | Update | Computers | BootFest | Rana, Yoichi
Most of the FE computers failed around the |
|
|
1049
|
Wed Oct 15 17:40:50 2008 |
rana | Update | PSL | PMC Offset adjusted | I set the PMC servo input offset: closed the
MOPA shutter, zeroed the mixer output with
the offset slider,
|
|
|
1051
|
Thu Oct 16 09:44:49 2008 |
Yoichi | Update | PSL | Bad cable for FSS | Yesterday arount 1:30PM, we lost the LO signal
for the FSS.
I found it was caused by a bad cable connecting |
|
|
1056
|
Fri Oct 17 21:41:09 2008 |
Yoichi | Update | Computer Scripts / Programs | burtwb missing on Solaris but installed on linux64 | c1lsc stalled this evening, so I powercycled
it.
After that, I tried to lock arms to confirm |
|
|
1057
|
Mon Oct 20 09:45:56 2008 |
steve | Update | PEM | PSL HEPA on | The PSL HEPA filter was turned on.
It should be running all times.
The 0.5 micron particle count is up to 20,000 |
|
|
1058
|
Mon Oct 20 12:18:38 2008 |
Alan | Update | Computer Scripts / Programs | burtwb missing on Solaris but installed on linux64 | [quote]c1lsc stalled this evening, so I powercycled
it.
After that, I tried to lock arms to confirm |
|
|
1062
|
Tue Oct 21 16:14:42 2008 |
steve | Update | General | divergence of He Ne 1035P | The ITM oplevs laser diodes are noisy.
They will be replaced by JDS 1035P
SN T8093307 was measured with the beamscanner.
|
|
|
1063
|
Tue Oct 21 16:17:45 2008 |
Yoichi | Update | PSL | AD797 Oscillation in the FSS board | I checked each op-amp's output in the FSS
board to see if any indication of slew-rate
saturation can be found.
|
|
|
1067
|
Wed Oct 22 12:37:47 2008 |
josephb | Update | Computers | Network spreadsheet | Attached in open office format as well as
excel format is spreadsheet containing all
the devices with IP addresses at the 40m. |
|
|
1069
|
Wed Oct 22 17:48:58 2008 |
Yoichi | Update | General | Lenses for focusing the optical lever laser (Re:divergence of He Ne 1035P) | Steve had difficulty in finding lenses for
focusing the HeNe laser for the ITM op-lev.
Following his measurement of the beam divergence, |
|
|
1072
|
Thu Oct 23 15:27:19 2008 |
Alberto | Update | General | Abs length | Here are the measurements I've got yesterday.
The plot shows the transmitted power after
the X arm while sweeping the frequency of |
|
|
1073
|
Thu Oct 23 18:23:47 2008 |
Alberto | Update | General | Abs length | [quote]Here are the measurements I've got
yesterday. The plot shows the transmitted
power after the X arm while sweeping the |
|
|
1074
|
Thu Oct 23 18:27:04 2008 |
Alberto | Update | General | Abs length | [quote]Here are the measurements I've got
yesterday. The plot shows the transmitted
power after the X arm while sweeping the |
|
|
1079
|
Thu Oct 23 21:52:27 2008 |
Yoichi | Update | PSL | FSS UGF now 450kHz | I measured the open loop transfer function
of the FSS, for the first time after I mitigated
the oscillation.
|
|