| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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.
|
|
|
1080
|
Thu Oct 23 23:09:18 2008 |
Yoichi | Update | PSL | MC UGF is now 75kHz | I measured three loop transfer functions of
the MC servo.
The blue curve in the first attachment is |
|
|
1082
|
Fri Oct 24 11:09:08 2008 |
steve | Update | SAFETY | more lexan plates under cameras | The MC2, MC3&1 and BSC-SUS cameras were repositioned
somewhat in the
process of placing lexan disks under neat |
|
|
1084
|
Fri Oct 24 11:42:48 2008 |
Alberto | Update | General | Abs length: locking the X arm cavity in TEM01/10 | I went back to lock the arm cavity in either
TEM01 or TEM10 mode. Attached are the results.
We still have several resonances which we |
|
|
1085
|
Fri Oct 24 15:05:13 2008 |
steve | Update | VAC | rga is out of order | The old Dycor RGA is out of order.
I'm getting ready to purchase an SRS instrument. |
|
|
1086
|
Fri Oct 24 17:21:13 2008 |
Alberto | Update | General | Abs length: the right amount of beam clipping | I found the reason why the peak at about 6.3MHz
appeared only on the TEM10 mode: the blade
was clipping the beam too much and it was |
|
|
1087
|
Fri Oct 24 18:05:01 2008 |
Alberto | Update | General | Abs length: transverse mode spacing measured for the X arm | The ETMX suffers of astigmatism. I measured
the following frequencies for the higher
order modes:
|
|
|
1090
|
Fri Oct 24 22:30:38 2008 |
Jenne,rana | Update | PEM | Noise from Guralp Seismometer | Attached is a Power Spectrum of the noise
on the Vert1 channel of the Guralp seismometer.
The noise is in the several hundreds of |
|
|
1091
|
Sun Oct 26 21:02:18 2008 |
rana | Update | Computer Scripts / Programs | SVN medm problem | As we've seen in the past a few times, there's
something wrong with the files in the [I]trunk/medm[/I]
area.
|
|
|
1092
|
Mon Oct 27 10:02:16 2008 |
Yoichi | Update | Computer Scripts / Programs | SVN medm problem | I tried to check out medm directory both from
my laptop and nodus.
I did not get the error.
|
|
|
1094
|
Mon Oct 27 11:23:10 2008 |
steve | Update | Photos | new Olympus camera with IR vision | The IR blocker was removed from our new Olympus
camera
SP 570UZ camera.
|
|
|
1097
|
Tue Oct 28 11:10:18 2008 |
Alberto | Update | LSC | Higher Order Mode resonances in the X arms | [quote]Recently we had been having some trouble
locking the full IFO in the [COLOR=green][I][FONT=Verdana]spring[/FONT][/I][/COLOR]
configuration (SRC on [COLOR=blue]+166[/COLOR]).
|
|
|
1100
|
Wed Oct 29 12:54:28 2008 |
Jenne | Update | PEM | Calibrated Guralp Noise compared to average ground motion | Here is a calibrated noise plot of the Guralp
seismometer box. This is the same noise
measured on Friday, measured at TP3 (just |
|
|
1101
|
Thu Oct 30 11:07:25 2008 |
Yoichi | Update | Computers | Wireless bridges arrived | Five wireless bridges for the GPIB-Ethernet
converters arrived.
One of them had a broken AC adapter. We have |
|
|
1103
|
Fri Oct 31 08:52:19 2008 |
steve | Update | SUS | ETMY damping restored | ETMY watchdogs were tripped yesterday morning
also. This is a problem that existed some
months ago.(?)
|
|
|
1105
|
Sun Nov 2 20:44:58 2008 |
rana | Update | ASS | Wiener Filter performance over 5 hours | I took one 2 hour stretch of data to calculate
a MISO Wiener filter to subtract the Ranger
seismometer
|
|
|
1106
|
Sun Nov 2 21:37:22 2008 |
rana | Update | PEM | Ranger recovery | The ranger signal has been bad since around
11 AM on Oct 25 (last Saturday). There are
no elog
|
|
|
1107
|
Mon Nov 3 09:59:47 2008 |
steve | Update | PSL | PSL HEPAs turned on | The psl [COLOR=chocolate]enclosure[/COLOR]
HEPAs were tuned on.
|
|
|
1108
|
Mon Nov 3 19:12:27 2008 |
alberto | Update | General | Transverse mode spacing measurement for the X arm | I know a lot of expectations have been building
up on these days in the scientific community
at the 40m towards a conclusive elog entry |
|
|
1111
|
Mon Nov 3 22:35:40 2008 |
rana | Update | ASS | Wiener Filter performance over 5 hours | [FONT=Comic Sans MS]To speed up the Wiener
filter work I defined a 256 Hz version of
the original 16kHz IOO-MC_L signal. The
|
|
|
1112
|
Tue Nov 4 00:47:53 2008 |
rana | Update | ASS | Wiener Filter performance over 5 hours | Same as before, but now with a working Ranger
seismometer.
|
|
|
1115
|
Wed Nov 5 12:41:36 2008 |
Alberto | Update | LSC | Absolute Length and g-factor measurements conclusions | [SIZE=4][B][COLOR=green]Absolute Length and
g-Factor Measurement for the 40m Arm Cavities,
Summary of Results[/COLOR][/B][/SIZE]
|
|
|
1116
|
Thu Nov 6 09:45:27 2008 |
steve | Update | MOPA | head temp hick-up vs power | The control room AC temp was lowered from
74F to 70F around Oct 10
This hold the head temp rock solid 18.45C |
|
|
1117
|
Thu Nov 6 10:06:41 2008 |
steve | Update | Locking | arms lock degradation | I have been locking the arms in the mornings
lately.
The daily drift of LSC-TRX is ~ 15% and LSC-TRY |
|
|
1120
|
Fri Nov 7 08:08:00 2008 |
steve | Update | PEM | AC turned off in IFO room | All [COLOR=red]tree[/COLOR] AC units in IFO
room 104 switched off at 7:45am
I'm looking for the periodic thump signal |
|
|
1121
|
Fri Nov 7 10:52:57 2008 |
steve | Update | PEM | AC is back on | The 20 minutes and 6 sec thumps are not related
to the 40m ac units
This period is precisely right on so it is |
|
|
1122
|
Fri Nov 7 15:58:10 2008 |
rana | Update | PEM | AC is back on | I'll bet Steve a dollar that it is mechanical.
The attached PDF compares all of the accelerometers
from right now.
|
|