| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2725
|
Mon Mar 29 01:45:26 2010 |
daisuke | Configuration | General | Periscope version B for green laser ... | Here the design of the periscope for the
90 deg steering version is posted.
straight version http://nodus.ligo.caltech.edu:8080/40m/2709 |
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|
2726
|
Mon Mar 29 02:07:50 2010 |
Koji | Summary | PSL | FSS Work from Sunday: Open Loop Gain |
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|
2727
|
Mon Mar 29 10:40:59 2010 |
josephb | Update | Cameras | GigE camera no work from screen |
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2728
|
Mon Mar 29 15:19:33 2010 |
mevans | Update | Green Locking | frequency discriminator for green PLL | Thanks for the great entry!
In order to make this work for higher
frequencies, I would add Hartmut's suggestion |
|
|
2729
|
Mon Mar 29 15:26:47 2010 |
Mott | HowTo | Computers | New script for controlling the AG4395A | I just put a script in the /cvs/cds/caltech/scripts/general/netgpibdata/
directory to control the network analyzer
called AG4395A_Run.py . A section |
|
|
2730
|
Mon Mar 29 18:41:34 2010 |
Koji | Configuration | SUS | Started to build TTs | Steve and Koji
WE started to build 5 TTs. 4 of them
are used in the recycling cavities. One is |
|
|
2731
|
Mon Mar 29 18:50:14 2010 |
Koji | Update | SUS | PRM sidemagnet glued | PRM was released from the fixuture without
any trouble. This was the last magnet gluing
until ETMs are delivered. |
|
|
2732
|
Mon Mar 29 21:43:27 2010 |
Alberto | Configuration | PSL | Reference Cavity PD Noise Spectrum | [Rana, Alberto]
This evening we measured the noise
spectrum of the reference cavity PD used |
|
|
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 |
|
|
2734
|
Tue Mar 30 11:16:05 2010 |
josephb | HowTo | Computers | ezca update information (CDS SVN) | I'd like to try installing an updated multi-threaded
ezca extension later this week, allowing
for 64-bit builds of GDS ezca tools, provided |
|
|
2735
|
Tue Mar 30 21:11:42 2010 |
kiwamu | Summary | Green Locking | conversion efficiency of PPKTP | With a
30mm PPKTP crystal the conversion efficiency |
|
|
2736
|
Tue Mar 30 22:13:49 2010 |
Koji | Summary | Green Locking | conversion efficiency of PPKTP | Question:
Why does the small spot size for
the case (A) have small efficiency as the |
|
|
2737
|
Wed Mar 31 02:57:48 2010 |
kiwamu | Update | Green Locking | frequency counter for green PLL | Rana
found that we had a frequency counter SR620
which might be helpful for lock acquisition |
|
|
2738
|
Wed Mar 31 03:45:49 2010 |
Mott | HowTo | Computers | New script for controlling the AG4395A |
I took data for the 2 NPRO PLL using
the script I wrote for the AG4395, but it |
|
|
2739
|
Wed Mar 31 10:34:02 2010 |
josephb | Update | elog | Elog not responding this morning | When I went to use the elog this morning,
it wasn't responding. I killed the
process on nodus, and then restarted, per |
|
|
2740
|
Wed Mar 31 11:52:32 2010 |
kiwamu | Summary | Green Locking | Re:conversion efficiency of PPKTP | Good point. There is a trick
to avoid a divergence.
Actually the radius of the cylindrical |
|
|
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 |
|
|
2742
|
Wed Mar 31 15:31:53 2010 |
steve | Update | PSL | Reference Cavity RF PD base upgraded |
|
|
|
2743
|
Wed Mar 31 16:31:44 2010 |
steve | Update | PEM | Guralp interface box turned off |
|
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|
2744
|
Wed Mar 31 16:55:05 2010 |
josephb | Update | Computers | 2 computers from Alex and Rolf brought to 40m | I went over to Downs today and was able
to secure two 8 core machines, along with
mounting rails. These are very thin |
|
|
2745
|
Wed Mar 31 19:29:58 2010 |
Hartmut | Update | Electronics | (1cm-) Si PD transfer functions update | Recorded transfer functions for the 1cm
Si-PD as described on p. 2708
for different biases. I put the plots |
|
|
2746
|
Thu Apr 1 00:43:33 2010 |
Mott | Update | General | PZT response for the innolight | Kiwamu and I measure the PZT response of
the Innolight this evening from 24 kHz to
2MHz. |
|
|
2747
|
Thu Apr 1 07:17:15 2010 |
Koji | Update | General | PZT response for the innolight | The shape of the TF looks nice but the
calibration must be wrong.
Suppose 1/f slope with 10^-4 rad/V |
|
|
2748
|
Thu Apr 1 10:21:58 2010 |
Mott | Update | General | PZT response for the innolight |
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|
|
2749
|
Thu Apr 1 10:47:48 2010 |
Koji | Update | General | PZT response for the innolight | Innolight: 100rad/V @ 100kHz =>
1e7/f rad/V => 10MHz/V
LWE: 500rad/V @ 100kHz => |
|
|
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 |
|
|
|
2752
|
Thu Apr 1 16:34:29 2010 |
Hartmut | Update | Green Locking | Silicon PDs | just a few infos on Silicon PDs I looked
up.
If you want to go beyond the 100MHz |
|
|
2753
|
Thu Apr 1 17:35:24 2010 |
Koji | Update | SUS | Working on ITMX/Y | Steve and Koji
- We removed old ITMX/Y from the
chambers. Now they are temporarily placed |
|
|
2754
|
Thu Apr 1 18:05:29 2010 |
Mott | Update | General | PZT response for the innolight |
We realized that we had measured
the wrong calibration value; we were using |
|
|
2755
|
Thu Apr 1 18:44:40 2010 |
Koji | Update | General | PZT response for the innolight | Innolight 10 rad/V @ 100kHz => 1e6/f
rad/V => 1MHz/V
LWE 30 rad/V @ 100kHz => 3e6/f |
|
|
2756
|
Thu Apr 1 19:59:32 2010 |
Mott | Update | General | PZT response for the innolight |
We measured the Amplitude Modulation
response of the PZTs, to find regions with |
|
|
2757
|
Thu Apr 1 20:29:02 2010 |
Hartmut | Update | Green Locking | simple PD test circuit | I made a simple PD test circuit which may
allow to test PD response up to few 100MHz.
Its not for low noise, only for characterising |
|
|
2758
|
Fri Apr 2 08:52:21 2010 |
Alberto | Update | elog | elog restarted | i just restarted the elog for the third
time in the past 12 hours.
I checked the elog.log file to debug |
|
|
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 |
|
|
2760
|
Sat Apr 3 16:07:40 2010 |
Alberto | Configuration | PSL | Reference Cavity PD Noise Spectrum | I was aware of a problem on those
units since I acquired the data. Then it
wasn't totally clear to me which were the |
|
|
2761
|
Sat Apr 3 19:54:19 2010 |
Alberto | Update | 40m Upgrading | REFL11 and REFL55 PDs Noise Spectrum | These are the dark noise spectrum that
I measured on the 11MHz and 55MHz PD prototypes
I modified. |
|
|
2762
|
Sun Apr 4 00:21:42 2010 |
rana, koji | Summary | Electronics | Checkout of EG&G (PARC) preamp model #113, s/n 49135 | We tested out the functionality of the
EG&G 113 preamp that I found in one of
the cabinets. This is one of the ancestors |
|
|
2763
|
Sun Apr 4 17:32:07 2010 |
Alberto | Metaphysics | General | new y-arm? |
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|
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 |
|
|
2765
|
Mon Apr 5 08:43:48 2010 |
steve | Update | PEM | earthquake mag 7.2 | Large
earthquake shakes Baja California, Mexico
and 6 over Magnitude 5 aftershakes follow. |
|
|
2766
|
Mon Apr 5 09:48:57 2010 |
Koji | Update | SUS | ITMs placed on the tables in the chambers | Steve and Koji (Friday, Apr 02)
Summary
Intsallation of ITMs are going on. |
|
|
2767
|
Mon Apr 5 10:23:40 2010 |
Alberto | Update | 40m Upgrading | REFL11 Low Frequency Oscilaltion Reduced | After adding an inductor L=100uH and a
resistor R=10Ohm in parallel after the OP547A
opamp that provide the bias for the photodiode |
|
|
2768
|
Mon Apr 5 10:33:12 2010 |
Alberto | Omnistructure | Electronics | soldering iron broken | This morning the pencil soldering iron
of our Weller WD2000M Soldering Station suddenly
stopped working and got cold after I turned |
|
|
2769
|
Mon Apr 5 11:39:41 2010 |
steve | Update | SUS | ITM-south installation |
|
|
|
2770
|
Mon Apr 5 13:07:36 2010 |
Jenne | Omnistructure | Electronics | soldering iron broken |
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|
2771
|
Mon Apr 5 13:20:16 2010 |
Koji | Omnistructure | Electronics | soldering iron broken | Albeto and Koji
We took the tip replacement from
the blue tower. |
|
|
2772
|
Mon Apr 5 13:52:45 2010 |
Alberto | Update | Computers | Front-ends down. Rebooted | This morning, at about 12 Koji found all
the front-ends down.
At 1:45pm rebooted ISCEX, ISCEY, |
|
|
2773
|
Mon Apr 5 14:10:06 2010 |
steve | Update | SUS | sus damping restored |
|
|
|
2775
|
Tue Apr 6 11:27:11 2010 |
Alberto | Update | Computer Scripts / Programs | Data formats in the Agilent AG4395a Spectrum Analyzer | Lately I've been trying to sort out the
problem of the discrepancy that I noticed
between the values read on the spectrum analyzer's |
|