| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
864
|
Wed Aug 20 18:09:48 2008 |
Yoichi | Update | IOO | MC still unlocks | Being suspicious of FSS PC path as the culprit
of the MC unlocks, I opened the FSS box and
connected a probe to the TP7,
|
|
|
868
|
Thu Aug 21 18:13:24 2008 |
rana | Update | IOO | MC WFS Control signals not responsible for lock losses | This is a 4 hour, second-trend of the MC WFS
error and control signals.
|
|
|
869
|
Fri Aug 22 10:39:41 2008 |
Jenne | Update | SUS | Taking Free Swinging spectra of PRM, SRM, ITMX, BS | I'm taking free swinging spectra of PRM, SRM,
ITMX and BS, so I've turned off their watchdogs
for now. I should be done around 11:15am, |
|
|
871
|
Fri Aug 22 16:06:29 2008 |
steve | Update | PEM | particle counter replaced, flowbenches & HEPAs checked | MetOne #2 counter was swapped in (on the top
of IOC, facing SW direction, at ~75 deg upwards)
with channel one size 0.3 micron and channel |
|
|
872
|
Fri Aug 22 17:03:41 2008 |
Yoichi | Update | IOO | MC open loop TF | I measured the open loop TF of the overall
MC loop using the sum-amp A of the MC board.
I used the Agilent 4395A network analyzer |
|
|
873
|
Sat Aug 23 09:39:51 2008 |
rana, jenne | Update | PSL | PMC Survey | Jenne, Rana
We scoped out the PMC situation yesterday. |
|
|
874
|
Mon Aug 25 10:07:35 2008 |
Jenne | Update | PSL | Numbers for the PMC servo board (Re: entry # 873) | Jenne, Rana
These are the numbers that go along with |
|
|
876
|
Mon Aug 25 10:51:06 2008 |
steve | Update | PSL | psl headtemp is coming down | The laser water cooler was overflowing this
morning.
I removed 500 cc water from the chiller.
|
|
|
878
|
Mon Aug 25 12:13:49 2008 |
Jenne | Update | PSL | Broken PMC Servo Board | [SIZE=3]I broke the PMC servo board[/SIZE]
(on accident).
|
|
|
879
|
Mon Aug 25 14:18:36 2008 |
Jenne | Update | PSL | PMC servo board is fixed | The PMC servo board is back in place, all
fixed up with a shiny new resistor. The
PMC locks, and the MC locks (I'm not saying |
|
|
892
|
Wed Aug 27 13:55:43 2008 |
rana,jenne | Update | PSL | PMC Servo Board | Board is back in. PMC is locked.
Nominal gain is now 15 dB with brick. We |
|
|
895
|
Fri Aug 29 02:40:43 2008 |
rana,jenne | Update | PSL | PMC Servo Board | [quote]Board is back in. PMC is locked.
[/quote]
|
|
|
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
|
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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.
|
|
|
920
|
Thu Sep 4 07:46:10 2008 |
Yoichi | Update | IOO | MC is now happy | The MC has been locked for more than 12 hours
continuously now !
Changes I made yesterday were:
|
|
|
921
|
Thu Sep 4 10:13:48 2008 |
Jenne | Update | IOO | We unlocked the MC temporarily | [Joe, Eric, Jenne]
While trying to diagnose some DAQ/PD problems |
|
|
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 |
|
|
928
|
Thu Sep 4 17:17:03 2008 |
Yoichi | Update | IOO | MC open loop TF | I measured open loop transfer functions of
the MC servo.
The UGF was about 30kHz. Since there was |
|
|
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. |
|
|
933
|
Fri Sep 5 10:36:34 2008 |
steve | Update | PEM | thermostate setting changed | Some one changed the thermostat (old control
room ) setting behind 1Y6 from 73 to 79F
It should be in the elog.
|
|
|
934
|
Fri Sep 5 15:09:50 2008 |
rana | Update | PEM | thermostate setting changed | [quote]Some one changed the thermostat (old
control room ) setting behind 1Y6 from 73
to 79F
|
|
|
935
|
Mon Sep 8 10:57:49 2008 |
steve | Update | IOO | the psl and mc are back to normal | The alarm handler is silent this morning.
This is almost unbelievably pleasant after
two mount of harassment.
|
|
|
936
|
Mon Sep 8 13:47:35 2008 |
steve | Update | PEM | thermostate setting changed | [quote][quote]Some one changed the thermostat
(old control room ) setting behind 1Y6 from
73 to 79F
|
|
|
938
|
Wed Sep 10 08:57:03 2008 |
steve | Update | General | etmy illuminator turned off | The ETMY illuminator was left on yesterday.
I just turned it off. |
|
|
940
|
Wed Sep 10 19:53:53 2008 |
Alberto | Update | General | abs length experiment | Update of the last days work on the experiment
to measure the absolute length of the cavities.
|
|
|
943
|
Thu Sep 11 23:28:35 2008 |
alberto | Update | General | abs cavity length experiment | The MC lost lock for some reason not related
to either the FSS or the PMC I'm done with
my measurement for tonight. I've shut the |
|
|
944
|
Fri Sep 12 11:09:20 2008 |
Alberto | Update | General | abs cavity length experiment | I'm leaving the lab for a couple of hours.
I shut the NPRO. The interferometer is available
to anyone. |
|
|
945
|
Sat Sep 13 23:13:01 2008 |
Alberto | Update | General | abs cavity length experiment | The Y arm was locked all time today but, suddenly,
this afternoon it lost lock and since then
I've been unable to restore it. I tried unsuccessfully |
|
|
946
|
Sun Sep 14 18:30:32 2008 |
Alberto | Update | General | ABSL: measured X arm | Today I measured the X arm FSR.
Hi moved the fast PD (Thor Labs PDA255) from
the Y end table to the X end table. I had |
|
|
947
|
Sun Sep 14 19:29:07 2008 |
Alberto | Update | General | ABSL: measured X arm | [quote]Today I measured the X arm FSR.
Hi moved the fast PD (Thor Labs PDA255) from
the Y end table to the X end table. I had |
|
|
953
|
Wed Sep 17 12:58:12 2008 |
rob | Update | Locking | bad |
Locking was pretty unsuccessful last night.
All the subparts were locked (ARMs, PRM, |
|
|
956
|
Wed Sep 17 13:58:36 2008 |
Alberto | Update | General | ABSL: results from the X arm | Today I repeated the measurement of the FSR
on the X arm cavity. The noise in the transmitted
power that made the measures fluctuate was |
|
|
958
|
Wed Sep 17 17:31:24 2008 |
Yoichi | Update | PSL | FSS calibration | I calibrated the reference cavity error signal
with the following procedure.
|
|
|
960
|
Wed Sep 17 19:13:47 2008 |
Alberto | Update | General | ABSL: status | I installed the setup for measuring TEM01/10
on the X end table.
I'm leaving. I shut the laser, flipped down |
|
|
962
|
Thu Sep 18 09:30:12 2008 |
steve | Update | General | low noise metal film resistors are in | Low noise metal film resistor and capacitor
kits from www.garrettelec.com are in.
|
|
|
963
|
Thu Sep 18 12:16:01 2008 |
Yoichi | Update | Computers | EPICS BACK | [quote]
Somehow the EPICS system got hosed tonight.
We're pretty much dead in the water till |
|
|
964
|
Thu Sep 18 13:05:05 2008 |
Yoichi | Update | Computers | EPICS BACK | [quote]
The Y-arm doesn't, because one of the digital
filters for the Y-arm lock fails to be loaded |
|
|
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 |
|
|
968
|
Fri Sep 19 00:06:54 2008 |
rana | Update | IOO | MC_F: Too much frequency noise around 100 Hz | WE noticed this excess again in MC_F. We tried
recentering the WFS, but no effect.
|
|
|
969
|
Fri Sep 19 00:18:14 2008 |
rana | Update | Computers | svn is old | [CODE]linux2:mDV>ssh nodus
Password:
Last login: Fri Sep 19 00:11:44 2008 from |
|
|
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. |
|