| 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 |
|
|
1034
|
Wed Oct 8 19:17:55 2008 |
Yoichi | Configuration | PSL | Laser power is slowly recovering | This afternoon we (rich, steve, yoichi) shutdown
the laser for the DC-DC converter installation.
|
|
|
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.
|
|
|
1043
|
Mon Oct 13 13:51:49 2008 |
pete | Configuration | PSL | attempt to measure FSS ref phase | On Friday I began a measurement of the FSS
reference phase. The setup involves the
following:
|
|
|
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.
|
|
|
1046
|
Tue Oct 14 14:19:36 2008 |
pete | Configuration | PSL | FSS ref phase | Today I made several measurements which should
yield the optimized phase for the FSS 21.5
MHz reference. I made two sets of measurements, |
|
|
1048
|
Tue Oct 14 19:24:34 2008 |
Yoichi | Configuration | PSL | FSS light power reduced | Rana, Yoichi
To change the gain distribution in the FSS, |
|
|
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,
|
|
|
1050
|
Wed Oct 15 22:07:52 2008 |
pete | Configuration | PSL | FSS ref phase measurements | Optimizing the FSS LO/RF phase at 500 kHz,
above the servo band, proved to be noisy
and those measurements were useless. Today |
|
|
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 |
|
|
1052
|
Thu Oct 16 09:47:49 2008 |
Yoichi | Configuration | PSL | FSS ref phase measurements | [quote] I fit the bottom (quadratic) portion
of this curve, and found an optimum delay
of 25.8 ns, which can be implemented as 25.81 |
|
|
1053
|
Thu Oct 16 13:12:58 2008 |
pete | Configuration | PSL | phase between FSS reference outputs | I verified the phase between the FSS reference
outputs (used for LO and RF) using matched
BNC cables. I measured 0.95 degree (average |
|
|
1054
|
Thu Oct 16 16:26:26 2008 |
pete | Configuration | PSL | FSS phase matching cable installed | RG 405 cable has a solid teflon dielectric,
and a velocity factor of 0.69. To get the
8.2 degrees of additional phase on the LO |
|
|
1061
|
Mon Oct 20 20:50:09 2008 |
Yoichi | Configuration | PSL | FSS board chip replacement | A quick update.
I changed two AD797s on the FSS board to |
|
|
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.
|
|
|
1064
|
Tue Oct 21 17:52:30 2008 |
rana | Summary | PSL | FSS Photo: early October | This is a photo of the FSS board before Yoichi
did his surgery - it was taken with the D40
in macro mode, sitting on the big Gorilla |
|
|
1078
|
Thu Oct 23 20:47:28 2008 |
pete | Configuration | PSL | FSS LO calibration for MEDM | Today I took a quick series of measurements
to calibrate the FSS LO power measurement
in the MEDM. This was done by using 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 |
|
|
1083
|
Fri Oct 24 11:21:26 2008 |
pete | Configuration | PSL | FSS LO input calibrated in dBm | Based on the measurements described in my
previous elog, I created a new calc record
in the file /cvs/cds/caltech/target/c1psl/psl.db
|
|
|
1095
|
Mon Oct 27 14:48:27 2008 |
Yoichi | Configuration | PSL | EO shutter installed to the reference cavity | I'm now preparing for cavity ring down measurements
of the reference cavity.
An EOM for polarization rotation is installed |
|
|
1099
|
Wed Oct 29 12:23:04 2008 |
Yoichi | Configuration | PSL | MZ alignment touched and the alarm level changed | Since the MZ reflection is alarming all the
time, I tried to improve the MZ alignment
by touching the folding mirror.
|
|
|
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.
|
|
|
1114
|
Tue Nov 4 17:58:42 2008 |
Alberto | DAQ | PSL | MC temperature sensor | I added a channel for the temperature sensor
on the MC1/MC3 chamber: C1:PSL-MC_TEMP_SEN.
To do that I had to reboot the frame builder. |
|
|
1124
|
Fri Nov 7 18:38:19 2008 |
Alberto | DAQ | PSL | MC temperature sensor hooked up | Alberto, Rana,
we found that the computer handling the signals
from ICS-110B was C1IOVME so we restarted |
|
|
1130
|
Wed Nov 12 11:14:59 2008 |
Caryn | DAQ | PSL | MC temp sensor hooked up incorrectly | MC Temperature sensor was not hooked up correctly.
It turns out that for the 4 pin LEMO connections
on the DAQ like J13, J14, etc. the channels |
|
|
1136
|
Fri Nov 14 19:20:42 2008 |
Yoichi | Update | PSL | Reference cavity ring down | Thanks to Bob making the high-voltage BNC
cables for the HV pulse generator, I was
able to operate the EOM in front of
|
|
|
1137
|
Fri Nov 14 20:35:47 2008 |
rana | Update | PSL | Reference cavity ring down | To make the DEI pulser make a fast pulse on
the EO shutter EOMs, we had to make sure:
|
|
|
1138
|
Fri Nov 14 22:40:51 2008 |
Yoichi | Update | PSL | Reference cavity ring down | [quote]
To make the DEI pulser make a fast pulse
on the EO shutter EOMs, we had to make sure:
|
|
|
1140
|
Mon Nov 17 15:07:06 2008 |
Yoichi | Update | PSL | Reference cavity ring down | I used MATLAB's system identification tool
box to estimate the response of the reference
cavity, i.e. cavity pole.
|
|
|
1149
|
Thu Nov 20 09:37:39 2008 |
steve | Update | PSL | MZ vs temp | This 12 days plot shows that it can hold lock
if the daily temp variation is not more than
3/4 of a degree C
|
|
|
1151
|
Fri Nov 21 16:11:26 2008 |
rana, alberto, rob | Update | PSL | Mach Zender alignment | The Mach Zender's dark port DC voltage had
gone up too high (~0.5 V)and was turning
yellow
|
|
|
1155
|
Fri Nov 21 20:29:43 2008 |
rana, alberto, rob | Update | PSL | Mach Zender alignment | [quote] So now the MZ alignment seems good;
Alberto is on the MC periscope alignment
like a cheap suit.[/quote]
|
|
|
1160
|
Mon Nov 24 17:14:44 2008 |
rana | Update | PSL | Mach Zender trends | It looks like the MZ has gotten less drifty
after the alignment on Friday. |
|
|
1162
|
Tue Nov 25 18:38:03 2008 |
Alberto, Rob | Update | PSL | MC Periscope Alignment | This morning when I came in I found the MC
cleaner unlocked and the autolocker script
could not lock it. The reflected beam was |
|
|
1166
|
Tue Dec 2 17:56:56 2008 |
Alberto, Rana | Configuration | PSL | MC Alignment | In the attempt to maximize the Mode Cleaner
transmission and minimize the reflection
from the steering mirrors of the MC periscope, |
|
|
1169
|
Wed Dec 3 11:58:10 2008 |
Alberto | Update | PSL | MC Alignment | Rana, Alberto,
more details on the MC alignment we did yesterday.
|
|
|
1190
|
Fri Dec 12 22:51:23 2008 |
Yoichi | Update | PSL | Reference cavity ring down measurement again | Bob made new HV-cables with HV compatible
coaxes. The coax cable is rated for 2kV,
which was as high as Bob
|
|
|
1191
|
Tue Dec 16 19:06:01 2008 |
Yoichi | Update | PSL | Reference cavity ring down repeated many times | Today, I repeated the reference cavity ring
down measurement many times to see how much
the results vary.
|
|
|
1228
|
Wed Jan 14 15:53:32 2009 |
steve | DAQ | PSL | MC temperature sensor | [quote]I added a channel for the temperature
sensor on the MC1/MC3 chamber: C1:PSL-MC_TEMP_SEN.
To do that I had to reboot the frame builder. |
|
|
1244
|
Thu Jan 22 11:54:09 2009 |
Alberto | Configuration | PSL | Mach Zehnder Output Beam QPD | I rotated by 180 degrees the 10% beam splitter
that it is used to fold the beam coming from
the Mach Zehnder (directed to the MC) on |
|
|
1246
|
Thu Jan 22 14:38:41 2009 |
caryn | DAQ | PSL | MC temperature sensor | [quote][quote]I added a channel for the temperature
sensor on the MC1/MC3 chamber: C1:PSL-MC_TEMP_SEN.
To do that I had to reboot the frame builder. |
|
|
1248
|
Fri Jan 23 10:00:21 2009 |
steve | Update | PSL | PMC transmission is down | The PMC transmission is going down.
I have not relocked the PMC yet. |
|
|
1250
|
Fri Jan 23 14:00:02 2009 |
Yoichi | Update | PSL | PMC transmission is down | [quote]The PMC transmission is going down.
I have not relocked the PMC yet.[/quote]
|
|
|
1254
|
Wed Jan 28 12:42:51 2009 |
Yoichi | Update | PSL | MOPA dying | Yoichi, Jenne, Peter
As most of you know, the MOPA output power |
|
|
1256
|
Wed Jan 28 19:08:50 2009 |
Yoichi | Update | PSL | Laser is back (sort of) | Yoichi, Peter, Jenne
Summary:
|
|
|
1257
|
Thu Jan 29 13:52:34 2009 |
Yoichi | Update | PSL | Laser is back (sort of) | Here is what I think has happened to the laser.
After the chiller line to the NPRO base clogged, |
|