| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
901
|
Fri Aug 29 15:01:45 2008 |
steve | Update | PSL | MOPA_HTEMP in increasing | The laser chiller temp is 21.9C ( it should
be 20.0C )
Control room temp 73F ok, no obvious block
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|
902
|
Fri Aug 29 16:35:18 2008 |
Yoichi | Configuration | PSL | beam block distorted | [quote]There was a beam block after the Mach
Zender. Who or what put this there?
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|
903
|
Fri Aug 29 17:39:25 2008 |
rana | Configuration | PSL | PMC: ADC Channels | The attached PNG shows the PMC error and controls
signals with no calibration.
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|
904
|
Fri Aug 29 18:24:48 2008 |
rana | HowTo | PSL | PMC: PZT Calibration | I calibrated the PMC PZT at DC by using 'trianglewave'
to drive the DC offset slider
and reading back PMC_PZT and PMC_TRANSPD_F |
|
|
905
|
Fri Aug 29 22:57:48 2008 |
Yoichi | Update | PSL | FSS loop transfer functions | I've been measuring a bunch of transfer functions
of the FSS related stuffs.
There are a lot to be analyzed yet, but here |
|
|
906
|
Sat Aug 30 13:28:01 2008 |
rana | Configuration | PSL | PMC: List of changes | This is a list of changes made to the PMC
board while we had it out for modifying the
notch:
|
|
|
907
|
Mon Sep 1 04:34:00 2008 |
rana | Update | PSL | FSS loop transfer functions | I started from 6th item in Yoichi's todo list.
1) Increased the setpoint of the thermostat |
|
|
908
|
Mon Sep 1 19:23:17 2008 |
Yoichi | Configuration | PSL | FSS on an auxiliary loop | Summary: The FSS is now temporarily disabled.
Naturally, the MC won't lock. I will fix
it tomorrow morning.
|
|
|
909
|
Tue Sep 2 07:58:34 2008 |
rana | Summary | PSL | FSS & PMC LO trends for 2 years | The attached plot is a 2 year minute trend
of the EPICS readback of the PMC & FSS LO
Monitors (FSS_LODET & PMC_LODET).
|
|
|
910
|
Tue Sep 2 09:58:42 2008 |
Yoichi | Configuration | PSL | FSS on an auxiliary loop | [quote]Summary: The FSS is now temporarily
disabled. Naturally, the MC won't lock. I
will fix it tomorrow morning.
|
|
|
911
|
Tue Sep 2 10:09:03 2008 |
steve | Update | PSL | head temp is cooling down | The chiller was over flowing this morning.
800 cc of water was removed.
PSL-126MOPA_HTEMP peaked at 20.7 C (normal |
|
|
912
|
Tue Sep 2 14:28:41 2008 |
Yoichi | Update | PSL | FSS EOM driving signal spectra | Rich advised me to change the +10V input of
the FSS crystal frequency reference board
from whatever voltage supply we use now to |
|
|
913
|
Tue Sep 2 22:43:16 2008 |
Yoichi | Configuration | PSL | Updated FSS open loop TF | Since the LO level of the FSS servo was too
low, I replaced the RF oscillator board with
a combination of
|
|
|
918
|
Thu Sep 4 00:38:14 2008 |
rana | Update | PSL | c1iovme power cycled | Entry 663 has a plot of this using the PSL/FSS/SLOWscan
script. It shows that the SB's were ~8x smaller
than the carrier.
|
|
|
919
|
Thu Sep 4 07:29:52 2008 |
Yoichi | Update | PSL | c1iovme power cycled | [quote]Entry 663 has a plot of this using
the PSL/FSS/SLOWscan script. It shows that
the SB's were ~8x smaller than the carrier.
|
|
|
923
|
Thu Sep 4 13:48:50 2008 |
Yoichi | Update | PSL | FSS modulation depth | I scanned the reference cavity with the NPRO
temperature (see the attached plot).
The power ratio between the carrier and the |
|
|
924
|
Thu Sep 4 14:43:58 2008 |
Jenne | Update | PSL | PMC Open Loop Gain | I have measured the PMC's open loop gain.
[SIZE=3][COLOR=green]UGF is 629.7Hz, with
a phase margin of 53 degrees.
|
|
|
926
|
Thu Sep 4 17:03:25 2008 |
Yoichi | Update | PSL | RF oscillator noise comparison | I measured current spectra of the RF signal
going to the FSS EOM.
The attachment compares the spectra between |
|
|
927
|
Thu Sep 4 17:12:57 2008 |
Yoichi | Update | PSL | FSS open loop TF | I changed the gain settings of the FSS servo.
Now the Common Gain is 5dB (the last night
it was 2dB) and the Fast Gain is 12dB (formerly |
|
|
929
|
Thu Sep 4 17:44:27 2008 |
Yoichi | Update | PSL | FSS error signal spectrum | Attached is a spectrum of the FSS error signal.
There are a lot of sharp peaks above 100kHz
(the UGF of the servo is about 200kHz).
|
|
|
931
|
Fri Sep 5 08:34:03 2008 |
steve | Update | PSL | MZ locked | The MC is happy.
The MZ can be locked if you move the slider
by hand. |
|
|
937
|
Mon Sep 8 15:38:57 2008 |
Yoichi | Configuration | PSL | POY RF amp is back to its original task | I temporarily fixed the busted ZHL-32A RF
amplifier's power connector by simply soldering
a cable to the internal circuit and pulling |
|
|
951
|
Tue Sep 16 16:47:01 2008 |
pete | Configuration | PSL | Prototype FSS reference installed | After verifying output, I installed the new
prototype 21.5 MHz FSS reference (Wenzel
crystal oscillator and ZHL-2 amp). Yoichi |
|
|
954
|
Wed Sep 17 13:43:54 2008 |
Yoichi | Configuration | PSL | RC sweep going on | I'm doing a cavity sweep of the RC. Please
leave the IFO untouched until the meeting
is over. |
|
|
957
|
Wed Sep 17 15:22:31 2008 |
Yoichi | Configuration | PSL | RC sweep going on | [quote]I'm doing a cavity sweep of the RC.
Please leave the IFO untouched until the
meeting is over.[/quote]
|
|
|
958
|
Wed Sep 17 17:31:24 2008 |
Yoichi | Update | PSL | FSS calibration | I calibrated the reference cavity error signal
with the following procedure.
|
|
|
959
|
Wed Sep 17 17:58:35 2008 |
Yoichi | Configuration | PSL | RC sweep going on | The cavity sweep is done. The IFO is free
now. |
|
|
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 |
|