| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
967
|
Thu Sep 18 23:31:26 2008 |
rana | Update | PSL | ISS: Saturating too often at nominal gain | The ISS has been saturating whenever the MC
relocks and puts the gain up to +8dB. I have
lowered the gain to +1 dB for now to stop |
|
|
971
|
Fri Sep 19 08:09:55 2008 |
steve | Update | PSL | psl HEPAs turned on | I have just turned on the PSL HEPA filters
at 60% operational speed. |
|
|
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 |
|
|
980
|
Mon Sep 22 21:30:06 2008 |
rana | Configuration | PSL | bad FSS | The MC refl power was going up and the FSS
PC drive was so large that I had to turn
up the FSS
|
|
|
982
|
Mon Sep 22 22:24:19 2008 |
rana | Configuration | PSL | bad FSS | [quote]The MC refl power was going up and
the FSS PC drive was so large that I had
to turn up the FSS...[/quote]
|
|
|
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 |
|
|
986
|
Tue Sep 23 15:28:06 2008 |
pete | Configuration | PSL | new 21.5 MHz FSS reference installed | The new 21.5 MHz FSS reference is now installed
in the rack with the 7 Sorensen PS. Both
outputs give 18.7 dBm. The MC seems happy.
|
|
|
989
|
Thu Sep 25 02:35:21 2008 |
rana | Summary | PSL | FAST is moving alot | It looks like the FAST signal has started
moving a lot - this is partly what inspired
us to tune the SLOW loop.
|
|
|
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 |
|
|
995
|
Fri Sep 26 00:19:54 2008 |
Jenne | Update | PSL | Filter-action with the PMC | Written, but not posted on 24Sept2008:
|
|
|
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 |
|
|
1001
|
Fri Sep 26 19:08:43 2008 |
rana | Configuration | PSL | Refcav Trans: PD + Camera + Dumps | I went out to improve the Refcav trans path.
I removed all ND filters to get rid of the |
|
|
1003
|
Mon Sep 29 01:19:40 2008 |
rana | Summary | PSL | Laser chiller running a little hot | I looked at it some last night and my suspicion
was the ISS. Whenever the ISS switch came
on the FAST got a kick.
|
|
|
1005
|
Mon Sep 29 13:23:40 2008 |
rob | Summary | PSL | Laser chiller running a little hot | [quote]I looked at it some last night and
my suspicion was the ISS. Whenever the ISS
switch came on the FAST got a kick.
|
|
|
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 |
|
|
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:
|
|
|
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 |
|
|
1017
|
Wed Oct 1 23:05:14 2008 |
Yoichi | Update | PSL | ISS RIN spectra | Stefan, Yoichi
We took relative intensity noise (RIN) spectra |
|
|
1018
|
Wed Oct 1 23:21:03 2008 |
Yoichi | Configuration | PSL | Reference cavity reflection camera | I re-centered the reference cavity reflection
camera, which has been mis-aligned for a
while.
|
|
|
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
|
|