| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2871
|
Mon May 3 15:39:39 2010 |
josephb | Update | CDS | Daily Downs update | Talked with Jay briefly today. Apparently
there are 3 IO chassis currently on the test
stand at Downs and undergoing testing (or |
|
|
2872
|
Mon May 3 16:53:27 2010 |
josephb | Update | CDS | Updated lsc.mdl and the ifo plant model with memory locations | I've updated the LSC and IFO models that
Rana created with new shared memory locations.
I've used the C1:IFO- for the ifo.mdl file |
|
|
2877
|
Tue May 4 13:14:43 2010 |
josephb | Update | CDS | lsc.mdl and ifo.mdl to build (with caveats) | I got around to actually try building the
LSC and IFO models on megatron. Turns
out "ifo" can't be used as a model |
|
|
2878
|
Tue May 4 14:57:53 2010 |
josephb | Update | Computers | Ottavia has moved | Ottavia was moved this afternoon from the
control room into the lab, adjacent to Mafalda
in 1Y3 on the top shelf. It has been |
|
|
2880
|
Wed May 5 01:19:05 2010 |
Koji | Update | IOO | MC spot centering cont"d | Koji and Zach
We improved the beam axis rotaion
on the MC. We still have |
|
|
2882
|
Wed May 5 16:32:39 2010 |
Alberto | Update | 40m Upgrading | New REFL55 PD, 11MHz rejection | Here's the (calibrated) transimpedance
of the new REFL55 PD.
T(55.3) / T_(11.06) = 93 dB |
|
|
2883
|
Wed May 5 16:58:21 2010 |
Koji | Update | PSL | 2W hooked up to the interlock service | Ben, Steve, and Koji
Ben came to the 40m and hooked up
a cable to the main interlock service. |
|
|
2884
|
Thu May 6 01:06:16 2010 |
Koji | Update | IOO | MC spot centering cont'd (Triumph) | Zach and Koji,
We
finally aligned the incident beam enough |
|
|
2885
|
Thu May 6 11:34:35 2010 |
rob | Update | CDS | lsc.mdl and ifo.mdl to build (with caveats) |
|
|
|
2886
|
Thu May 6 16:18:37 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode | After munching analytical models, simulations,
measurements of photodiodes I think I got
a better grasp of what we want from them, |
|
|
2889
|
Thu May 6 18:25:20 2010 |
Jenne | Update | PEM | Acc power supply turned on | The accelerometer power supply / preamp
board has been OFF because of exciting new
accelerometer measurements. It's now |
|
|
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 |
|
|
2892
|
Thu May 6 19:51:22 2010 |
Jenne | Update | PEM | New 'Seismic Spectrum of the 40m' | For reasons unknown, the seismic spectra
posted above Rosalba has been wrong since
~January when it was first posted. |
|
|
2893
|
Thu May 6 19:57:26 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
|
|
|
2894
|
Fri May 7 11:21:49 2010 |
koji | Update | 40m Upgrading | New improved design for the 11MHz photodiode | How much is the width?
|
|
|
2895
|
Fri May 7 14:51:04 2010 |
josephb | Update | CDS | Working on meta .mdl file scripts | I'm currently working on a set of scripts
which will be able to parse a "template"
mdl file, replacing certain key words, with |
|
|
2896
|
Fri May 7 18:18:02 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
|
|
|
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 |
|
|
2898
|
Fri May 7 21:55:59 2010 |
kiwamu | Update | PSL | remove Mach-Zehnder | [Koji, Kiwamu]
The |
|
|
2900
|
Sat May 8 03:09:15 2010 |
Koji | Update | IOO | Steering around MC | After the MZ-removal work:
- I found that the input steering
(IM1) was right handed. This was different |
|
|
2902
|
Mon May 10 16:59:35 2010 |
Alberto | Update | 40m Upgrading | Unexpected oscilaltionin the POY11 PD | The measured transimpedance of the latest
POY11 PD matches my model very well up to
100 MHz. But at about ~216MHz I have a resonance |
|
|
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 |
|
|
|
2907
|
Mon May 10 20:03:22 2010 |
Kevin | Update | Green Locking | Green Laser Beam Profile | Kiwamu and Kevin measured the beam profile
of the green laser by the south arm ETM.
The following measurements were made |
|
|
2909
|
Mon May 10 22:25:03 2010 |
Koji | Update | Green Locking | Green Laser Beam Profile | Hey, what a quick work!
But,
wait... |
|
|
2910
|
Tue May 11 14:39:17 2010 |
Aidan | Update | Green Locking | Green Laser Beam Profile |
Here's a photo of the set-up
used. The beam profile is measured relative |
|
|
2911
|
Tue May 11 16:38:16 2010 |
josephb,rana,rolf | Update | CDS | CDS questions and thoughts | 1) What is c1asc doing? What is ascaux
used for? What are the cables labeled
"C1:ASC_QPD" in the 1X2 rack really |
|
|
2912
|
Tue May 11 17:02:43 2010 |
Kevin | Update | Green Locking | Green Laser Beam Profile |
|
|
|
2915
|
Wed May 12 02:35:13 2010 |
Koji, Rana, Kiwamu | Update | Green Locking | Reflection from ETM and ITM ! | We succeeded in getting
the reflected green beam from both ITMY and |
|
|
2916
|
Wed May 12 03:42:38 2010 |
Koji | Update | Green Locking | Green Laser Beam Profile | Strange.
I thought the new result became twice of
the first result. i.e. w0=32um or so. |
|
|
2917
|
Wed May 12 03:52:54 2010 |
Koji | Update | Green Locking | Reflection from ETM and ITM ! | I could not understand this operation.
Can you explain this a bit more?
It sounds different from the standard |
|
|
2918
|
Wed May 12 03:56:54 2010 |
Koji | Update | IOO | Faraday aligned | Zach and Koji
The old small MMT was removed and
wrapped by Al foils. |
|
|
2919
|
Wed May 12 09:16:29 2010 |
steve | Update | Green Locking | Reflection from ETM and ITM ! |
Now I know why Rana was wearing
his bright green pants yesterday. It is nice |
|
|
2920
|
Wed May 12 10:33:32 2010 |
kiwamu | Update | Green Locking | Re: Reflection from ETM and ITM ! | The procedure you wrote down as a standard
is right. I explain reasons why
we didn't do such way. |
|
|
2921
|
Wed May 12 12:25:11 2010 |
Koji | Update | Green Locking | Re: Reflection from ETM and ITM ! | ???
I still don't understand. What principle
are you rely on? |
|
|
2924
|
Wed May 12 17:10:16 2010 |
Alberto | Update | 40m Upgrading | RF frequency generation box - step 0 | I started putting together the components
that are coint to go inside the frequency
generation box. Here's how it looked like: |
|
|
2925
|
Wed May 12 23:31:17 2010 |
Alberto | Update | 40m Upgrading | 216 MHz resonance in the POY11 PD killed | It turned out that the resonance at 216
MHz in the 11MHz PD that I showed in the
elog entry 2902 |
|
|
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 |
|
|
2927
|
Thu May 13 15:19:44 2010 |
josephb | Update | CDS | Trying to get lsc.mdl and lsp.mdl working | I had a chat with Alex this morning and
discovered that the dcu_ids 13,14,15,16 are
reserved currently, and should not be used. |
|
|
2930
|
Fri May 14 08:18:46 2010 |
steve | Update | Green Locking | Reflection from ETM and ITM ! | I stopped AWG 1 Hz drive to ITMYs.
ITMXe was also driven or oscillating. ITMXe
damping was off, so I turned it on. It did |
|
|
2932
|
Fri May 14 12:14:26 2010 |
josephb | Update | CDS | Need to track down old code for lsc system and remove them | I'm currently in the process of tracking
down what legacy code is interfering with
the new lsc model. |
|
|
2933
|
Fri May 14 16:14:37 2010 |
Kevin | Update | Green Locking | Green Laser Beam Profile |
|
|
|
2934
|
Fri May 14 16:19:22 2010 |
Jenne | Update | PEM | Guts of a Guralp | [Jenne, Rana]
We took apart and examined one of
the Guralp seismometers this afternoon. |
|
|
2936
|
Sun May 16 12:51:08 2010 |
kiwamu | Update | Green Locking | reflected beam at PD | Mode matching
to the cavity has been done. |
|
|
2937
|
Sun May 16 19:25:45 2010 |
Koji | Update | Green Locking | reflected beam at PD | Don't
make a short cut. The beam size at a single
place does not tell you anything. |
|
|
2940
|
Mon May 17 17:17:49 2010 |
josephb, steve, alberto, kiwamu | Update | CDS | New CDS computers now in racks. | We placed 3 new computers in the racks.
One in 1X4 (machine running SCX) and 2 in
1Y4 (LSC and SUS). These are 1U chassis, |
|
|
2941
|
Mon May 17 19:42:11 2010 |
Jenne | Update | IOO | First steps toward MC mode measuring | [Jenne, Kevin, Steve]
We made some progress toward getting
the MC's beam profile measured. In |
|
|
2942
|
Tue May 18 01:40:56 2010 |
Koji | Update | IOO | First steps toward MC mode measuring | OK. Don't worry. This is just an initial
confusion which we also had for the suspensions
a while ago. |
|
|
2945
|
Tue May 18 12:04:13 2010 |
rob | Update | IOO | First steps toward MC mode measuring |
|
|
|
2946
|
Tue May 18 14:30:31 2010 |
josephb | Update | CDS | LSC.mdl problem found and fixed | After having checked old possibilities
and deciding I wasn't imagining the lsc.mdl
file not working, but working as another |
|