| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
|
2735
|
Tue Mar 30 21:11:42 2010 |
kiwamu | Summary | Green Locking | conversion efficiency of PPKTP | With a
30mm PPKTP crystal the conversion efficiency |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
2727
|
Mon Mar 29 10:40:59 2010 |
josephb | Update | Cameras | GigE camera no work from screen |
|
|
|
2726
|
Mon Mar 29 02:07:50 2010 |
Koji | Summary | PSL | FSS Work from Sunday: Open Loop Gain |
|
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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. |
|
|
2719
|
Sun Mar 28 20:00:17 2010 |
rana | Update | Cameras | GigE camera no work from screen | Not that this is an urgent concern, just
a data point which shows that it doesn't
just not work at the sites. |
|
|
2718
|
Sun Mar 28 17:28:26 2010 |
matt, kiwamu | Update | Green Locking | frequency discriminator for green PLL | Last Friday, Matt made a frequency discriminator
circuit on a bread board in order |
6x |
|
2717
|
Sat Mar 27 16:23:10 2010 |
Koji | Update | SUS | another SRM sidemagnet glued | Kiwamu and Koji
Last night we have released PRM from
the gluing fixture. All of the six magnets |
|
|
2716
|
Fri Mar 26 10:48:35 2010 |
steve | Update | SAFETY | safety glasses measured | Safety
glasses 1064 nm transmission measured at
~200 mW level. They are all good. |
|
|
2715
|
Thu Mar 25 17:32:42 2010 |
Alberto | Update | 40m Upgrading | REFL55 Upgraded | I upgraded the old REFL199 to the new REFL55.
To do that I had to replace the old
photodiode inside, switching to a 2mm one. |
|
|
2714
|
Thu Mar 25 17:29:48 2010 |
kiwamu, mott | Update | Green Locking | PLL two NPROs | In this afternoon, Mott and I tried to
find a beat note between two NPROs which
are going to be set onto each end table for |
|
|
2713
|
Thu Mar 25 09:07:08 2010 |
steve | Update | PEM | Guralp2 x problem is back |
|
|
|
2712
|
Wed Mar 24 15:59:59 2010 |
kiwamu, matt | Update | Green Locking | leave PLL locked | Matt checked it in this morning and he
found it's been locked during the night.
|
|
|
2711
|
Wed Mar 24 14:57:21 2010 |
Alberto | Update | 40m Upgrading | REFL11 upgraded |
Hartmut suggested a possible
explanation for the way the electronics transfer |
|
|
2710
|
Wed Mar 24 14:52:02 2010 |
Alberto | Update | Green Locking | two NPRO PLL |
|
|
|
2709
|
Wed Mar 24 12:40:25 2010 |
daisuke | Configuration | General | Periscope for green laser delivery from the BSC to PSL table | The periscope design for beam elevation
of the green beams is posted. The design
for the 90 deg steering version is also coming. |
|
|
2708
|
Wed Mar 24 12:38:17 2010 |
Hartmut | Configuration | Green Locking | Broadband PD for green PLL | Modified one of the PD assemblies carrying
a large SI-Diode (~10mm diameter).
Removed elements used for resonant |
|
|
2707
|
Wed Mar 24 04:22:51 2010 |
kiwamu, matt | Update | Green Locking | two NPRO PLL | Now some pedestals, mirrors and lenses
are left on the PSL table, since we are on
the middle way to construct a PLL setup which |
|
|
2706
|
Wed Mar 24 03:58:18 2010 |
kiwamu, matt, koji | Update | Green Locking | leave PLL locked | We are leaving the PLL as it is locked
in order to see the long term stability.
And we will check the results in early morning |
|
|
2705
|
Wed Mar 24 02:06:24 2010 |
Koji | Update | IOO | vac envelope has to be sealed as antproof for overnight | Matt and Koji:
We closed the light doors of the
chambers. |
|
|
2704
|
Tue Mar 23 22:46:43 2010 |
Alberto | Update | 40m Upgrading | REFL11 upgraded | I modified REFL11 according to the changes
lsited in this
schematic (see wiki / Upgrade 09 |
|
|
2703
|
Tue Mar 23 18:44:46 2010 |
Mott | Update | ABSL | PLL reconstructed |
After realigning and getting
the lock today, I tried to add in the SR785 |
|
|
2702
|
Tue Mar 23 15:38:26 2010 |
Alberto | Update | elog | elog just restarted | I found the elog down and I restarted it.
Then, after few seconds it was down
again. Maybe someone else was messing with |
|
|
2701
|
Tue Mar 23 10:11:13 2010 |
steve | Update | PEM | small air cond unit failed yesterday | Old control room air condition failed yesterday
around noon. It was blowing 80-85F hot air
for about 2-3 hours at racks 1Y4-7 and the |
|
|
2700
|
Tue Mar 23 09:55:20 2010 |
Koji | Update | IOO | vac envelope has to be sealed as antproof for overnight | Roger.
|
|
|
2699
|
Tue Mar 23 09:37:36 2010 |
steve | Update | IOO | vac envelope has to be sealed as antproof for overnight |
|
|
|
2698
|
Tue Mar 23 00:31:51 2010 |
Koji | Update | IOO | MC realigned | This is the first touch to the MC mirrors
after the earthquake on 16th.
I made an aluminum access |
|
|
2697
|
Mon Mar 22 23:37:32 2010 |
Mott | Update | ABSL | PLL reconstructed |
We have managed to lock the PLL to
reasonable stability. The RF input is attenuated |
|
|
2696
|
Mon Mar 22 22:11:26 2010 |
Mott | Update | ABSL | PLL reconstructed |
It looks like the PLL drifted
alot over the weekend, and we couldn't get |
|
|
2695
|
Mon Mar 22 16:57:45 2010 |
josephb,daisuke, alex | Configuration | Computers | Megatron test points working again | We changed the pointer on /cvs/cds/caltech/target/gds/bin/awgtpman
from
/opt/gds/awgtpman to |
|
|
2694
|
Mon Mar 22 11:37:09 2010 |
steve | Update | PEM | jackhammering | There was more jackhammering this morning
just about 20 ft north-west of the beamsplitter
chamber, outside. |
|
|
2693
|
Mon Mar 22 10:07:30 2010 |
Koji | Summary | Electronics | UPDH Box #17: Ready | For your reference: Voltage noise of LM7815/LM7915
(with no load) |
|
|
2692
|
Mon Mar 22 02:03:57 2010 |
rana | Summary | Electronics | UPDH Box #17: Ready | It took too long to get this box ready
for action. I implemented all of the changes
that I made on the previous one (#1437). |
|
|
2691
|
Sun Mar 21 21:02:39 2010 |
Koji | Update | PSL | EOM waist size | You don't need a lengthy code for this. It
is obvious that the spot size at the distance
L is minimum when L =
|
|
|
2690
|
Sun Mar 21 20:08:20 2010 |
kiwamu, rana | Update | PSL | EOM wasit size | We
are going to set the waist size to 0.1 mm for |
|
|
2689
|
Sun Mar 21 19:25:29 2010 |
rana | Update | PEM | Guralp2 centered again | From this morning, now in calibrated units,
and with the Güralp self noise spec
from the Güralp manual. |
|