| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2720
|
Sun Mar 28 20:05:33 2010 |
rana | Summary | PSL | FSS Work from Sunday: AOM/VCO level set wrong | Just before working on the FSS today, I
noticed that the VCO RF output level was
set incorrectly. |
|
|
2721
|
Sun Mar 28 20:51:31 2010 |
rana | Summary | PSL | FSS Work from Sunday: Cavity Suspension is Ridiculously Undamped! | What
is the Transfer Function of the suspension |
|
|
2722
|
Sun Mar 28 23:17:46 2010 |
rana | Summary | PSL | FSS Work from Sunday: noise spec | This is the error point spectrum - it is
filled with huge multiples of ~75 kHz as
Yoichi noticed a couple years ago. |
|
|
2723
|
Sun Mar 28 23:47:47 2010 |
rana | Summary | PSL | FSS Work from Sunday: Open Loop Gain | I measured the open loop gain of the FSS
(as usual, I have multiplied the whole OLG
by 10dB to account for the forward loop gain |
|
|
2724
|
Mon Mar 29 01:11:33 2010 |
rana | Summary | PSL | FSS Work from Sunday: RF Out Spectrum | I measured the RF spectrum coming out
the FSS RFPD to look for saturations - its
close to the hairy edge. This is with |
|
|
2733
|
Tue Mar 30 06:37:32 2010 |
rana | Configuration | PSL | Reference Cavity PD Noise Spectrum | Some more words about the RFAM: I noticed
that there was an excess RFAM by unlocking
the RC and just looking at the RF out with |
|
|
2741
|
Wed Mar 31 12:30:31 2010 |
rana | Update | Green Locking | frequency counter for green PLL | Its a good measurement - you should adjust
the input range of the 620 using the front
panel 'scale' buttons to see how the noise |
|
|
2750
|
Thu Apr 1 12:07:22 2010 |
rana | Update | General | PZT response for the innolight | The Lightwave NPRO |
|
|
2751
|
Thu Apr 1 15:21:12 2010 |
rana | Update | Green Locking | frequency counter for green PLL |
|
|
|
2759
|
Sat Apr 3 11:35:47 2010 |
rana | Configuration | PSL | Reference Cavity PD Noise Spectrum | The units on this
plot are completely bogus - we know that
the thermal noise from the resonant part |
|
|
2764
|
Mon Apr 5 01:02:07 2010 |
rana | Update | PEM | Guralp interface box turned off | I was
checking into the Guralp situation today.
I put the rubber balls underneath the granite |
|
|
2805
|
Mon Apr 19 05:54:50 2010 |
rana | Configuration | PSL | RC Temperature Servo Turned OFF temporarily | In order to measure the transfer function
of the RC cavity's foam, I've turned off
the servo so that the room temperature noise |
|
|
2806
|
Mon Apr 19 07:38:07 2010 |
rana | HowTo | Electronics | Repair and Calibration of SR560: s/n 59650 | Frank noticed that this particular SR560
had an offset on the output which was unzeroable
by the usual method of tuning the trim pot |
|
|
2829
|
Wed Apr 21 22:11:48 2010 |
rana | Update | PSL | Innolight 2W Vertical Beam Profile | Back in Gainesville in 1997, I learned
how to do this using the chopper wheel. |
|
|
2839
|
Sun Apr 25 02:56:07 2010 |
rana | Update | LSC | Started dev of LSC FE | LSC
Plant Model. That is all. |
|
|
2865
|
Sun May 2 15:38:12 2010 |
rana | Summary | SUS | Coil Actuator Balancing and Spot Position |
Oh, but it gets even better: in order
to trust the A2L script in this regard you |
|
|
2869
|
Mon May 3 01:16:50 2010 |
rana | HowTo | Electronics | Marconi phase noise measurement setup | To try the 3-corner hat method
on the Marconis, I started to set up the |
|
|
2873
|
Mon May 3 17:49:41 2010 |
rana | Configuration | PSL | RC Temperature Servo Turned OFF temporarily |
|
|
|
2875
|
Tue May 4 02:28:38 2010 |
rana | Configuration | PSL | RC Temperature Servo Turned OFF temporarily |
My attempt to passively measure |
|
|
2879
|
Tue May 4 18:40:27 2010 |
rana | HowTo | Electronics | Marconi phase noise measurement setup | To check the UGF, I increased the gain
of the PLL by 10 and looked at how much the
error point got suppressed. The green trace |
|
|
2881
|
Wed May 5 02:37:55 2010 |
rana | Configuration | PSL | RC Temperature Servo Turned OFF temporarily |
|
|
|
2890
|
Thu May 6 18:43:58 2010 |
rana | Update | PEM | Noise floor of the Ranger Seismometer | I
added a noise model of the SR560 to the LISO
opamp.lib. This assumes you're |
|
|
2897
|
Fri May 7 19:02:27 2010 |
rana | Update | 40m Upgrading | New improved design for the 11MHz photodiode | To measure the width of a resonance, the
standard method is to state the center frequency
and the Q. Use the definition of Q from the |
|
|
2901
|
Sun May 9 20:02:23 2010 |
rana | Configuration | SUS | SUS filters deleted again to reduce CPU load on c1susvme2 again | On Friday, I deleted a bunch of filters
from the c1susvme2 optics' screens (MC1,2,3
+ SRM) so as to reduce the CPU load and keep |
|
|
2904
|
Mon May 10 18:56:53 2010 |
rana | Update | Electronics | Unexpected oscilaltionin the POY11 PD | Where did you get the 55nH based notch
from? I don't remember anything like that
from the other LSC PD schematics. This is |
|
|
2905
|
Mon May 10 19:09:45 2010 |
rana | Update | Electronics | Unexpected oscilaltionin the POY11 PD |
|
|
|
2913
|
Tue May 11 18:58:49 2010 |
rana | HowTo | Electronics | Marconi phase noise measurement setup | Just a little while ago, at 2330 UTC on
5/11, I swapped the phase noise setup to
use another Marconi - this time its the 3rd |
|
|
2914
|
Wed May 12 02:21:56 2010 |
rana | HowTo | Electronics | Marconi phase noise measurement setup | Finally got the 3-cornered-hat measurement
of the IFRs done. The result is attached.
|
|
|
2926
|
Thu May 13 05:06:43 2010 |
rana | Update | 40m Upgrading | 216 MHz resonance in the POY11 PD killed |
This idea was tried before
by Dale in the ~1998 generation of PDs. Its |
|
|
2973
|
Mon May 24 10:03:14 2010 |
rana | Update | LSC | 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. |
If you have a working 40m Optickle
model, put it in a common place in the SVN, |
|
|
2974
|
Mon May 24 11:32:05 2010 |
rana | Update | LSC | 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. |
|
|
|
2999
|
Thu May 27 09:43:50 2010 |
rana | Update | Green Locking | more details |
|
|
|
3002
|
Thu May 27 23:59:54 2010 |
rana | Update | PEM | New Foam Box installed | Valera
and I put the 2 Guralps and the Ranger onto
the big granite slab and then put the new |
|
|
3003
|
Fri May 28 00:40:53 2010 |
rana | Update | PEM | DAQ down | Although trends are available, I
am unable to get any full data from in the
past (using DTT or DV). I started the FB's |
|
|
3018
|
Sun May 30 22:18:49 2010 |
rana | Update | PEM | Granite slab w/ lead balls is so far a flop | The seismometers showed an increased
noise in the Y-direction when put on top
of the granite slab. By tapping the slab, |
|
|
3022
|
Mon May 31 22:52:57 2010 |
rana | Update | PEM | Granite slab w/ lead balls is so far a flop | This plot shows the noise with the box
on, but no granite. We're still pretty far
off from the Guralp data sheet. |
|
|
3047
|
Thu Jun 3 22:17:05 2010 |
rana | Update | PEM | seismometers off of linoleum floor | At ~2350 UTC on June 2, the seismometers
were turned off. After the granite slab was
repositioned with the new lead, the Ranger |
|
|
3050
|
Fri Jun 4 23:52:57 2010 |
rana | Update | PEM | seismometers off of linoleum floor | |
|
|
3051
|
Sun Jun 6 04:48:41 2010 |
rana | Update | COC | ITM01 HR Phase Map | While trying to set up the SIS-FFT to use
our new ITM phase maps, I noticed that the
surface of our ITMs looks pretty good actually |
|
|
3056
|
Tue Jun 8 18:39:36 2010 |
rana | Update | PEM | DAQ down |
|
|
|
3061
|
Wed Jun 9 21:05:44 2010 |
rana | Summary | Computers | op540m is not to be used | This is a reminder (mainly for Steve, who somehow |
|
|
3078
|
Tue Jun 15 19:24:25 2010 |
rana | Update | IOO | Mode Profile after Mode Matching Telescope |
|
|
|
3090
|
Sat Jun 19 17:31:48 2010 |
rana | DAQ | CDS | Excess Noise in C1:IOO-MC_DRUM1 fixed by reboot | I was getting an excess noise in the C1:IOO-MC_DRUM1
channel - it was a flat spectrum of 10 cts/rHz |
|
|
3110
|
Wed Jun 23 23:08:30 2010 |
rana | Configuration | PSL | FSS SLOWDC should be ~-4.0 |
|
|
|
3123
|
Sat Jun 26 05:02:04 2010 |
rana | HowTo | SVN | SVN woes |
|
|
|
3125
|
Sat Jun 26 21:13:19 2010 |
rana | Summary | Computer Scripts / Programs | COMSOL 4.0 Installation | I've
installed COMSOL 4.0 for 32/64 bit Linux
in /cvs/cds/caltech/apps/linux64/COMSOL40/
It |
|
|
3129
|
Mon Jun 28 21:26:05 2010 |
rana | Summary | CDS | CDS adapter board notes | Those drawings are an OK start, but its
obvious that things have changed at the 40m
since 2002. We cannot rely on these drawings |
|
|
3132
|
Tue Jun 29 10:20:58 2010 |
rana | Update | MOPA | MOPA is NOT dead | Not dead. It just had a HT fault. You can
tell by reading the front panel. Cycling
the power usually fixes this. |
|
|
3141
|
Wed Jun 30 00:45:26 2010 |
rana | Update | VAC | slow pumpdown stopped for the night | As per Steve's instructions, at 12:43 AM,
I used the following steps to stop the pumpdown
until the morning: |
|
|
3151
|
Wed Jun 30 23:03:46 2010 |
rana | Configuration | IOO | Power into MC restored to max | Kiwamu, Nancy, and I restored the power
into the MC today:
Changed the 2" dia. |
|