ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
10977
|
Wed Feb 4 21:05:24 2015 |
manasa | Update | General | RF amplifier for ALS | The components of the RF amplifier
box are in place. The RF amplifier box has
been mounted on the IOO rack and the front |
|
10978
|
Wed Feb 4 21:09:43 2015 |
manasa | Update | General | X endtable work scheduled tomorrow | The X end fiber setup will be put together
tomorrow morning. |
|
10979
|
Thu Feb 5 04:35:14 2015 |
diego | Update | LSC | CARM Transition to REFL11 using CM_SLOW Path | [Diego, Eric]
Tonight was a sad night... We continued
to pursue our strategy, but with very poor |
|
10981
|
Thu Feb 5 15:21:25 2015 |
manasa | Update | General | X endtable work | [EricG, Manasa]
We were at the X end today trying
to couple AUX X light into the fiber. |
|
10982
|
Fri Feb 6 03:21:17 2015 |
diego | Update | LSC | CARM Transition to REFL11 using CM_SLOW Path | [Diego, Jenne]
We kept struggling with the PRMI,
although it was a little better than yesterday: |
|
10983
|
Fri Feb 6 10:03:23 2015 |
Steve | Update | PEM | dusty days |
|
|
10984
|
Fri Feb 6 15:29:29 2015 |
ericq | Update | CDS | Network Shenanigans | Just now we had another EPICS freeze. The
network was still up; i.e. I could ssh to
chiara and fb, who both seemed to be |
|
10985
|
Fri Feb 6 18:06:18 2015 |
manasa | Update | General | Fiber Optic module for FOL | I pulled out the Fiber Optic Module for
FOL from the rack inside the PSL table enclosure
and modified it. The beat PDs were moved |
|
10987
|
Sat Feb 7 21:30:45 2015 |
Jenne | Update | LSC | PRC aligned | I'm leaving the PRC aligned and locked.
Feel free to unlock it, or do whatever with
the IFO. |
|
10989
|
Mon Feb 9 08:40:49 2015 |
Steve | Update | SUS | recent earthquake 4.9 | Baja 4.9 m earth quake tripped suspentions,
except ETMX Sus damping recovered. MC is
locking. |
|
10990
|
Mon Feb 9 17:23:17 2015 |
diego | Update | Computer Scripts / Programs | New laptops | I forgot to elog about these ones, my bad...
The new/updated laptops are giada, viviana
and paola; paola is already in the lab, while |
|
10991
|
Mon Feb 9 17:47:17 2015 |
diego | Update | LSC | CM servo & AO path status | I wrote the script with the recipe we used,
using the Yarm and AS55 on the IN2 of the
CM board; however, the steps where the offset |
|
10992
|
Tue Feb 10 02:40:54 2015 |
Jenne | Update | LSC | Some locking thoughts on PRMI | [EricQ, Jenne]
We wanted to make the PRMI lock
more stable tonight, which would hopefully |
|
10994
|
Tue Feb 10 03:09:02 2015 |
ericq | Update | LSC | Some locking thoughts on PRMI | Unfortunately, we only had one good CARM
offset reduction to powers of about 25, but
then my QPD loop blew it. We spent the vast |
|
10995
|
Tue Feb 10 13:48:58 2015 |
manasa | Update | LSC | Probable cause for headaches last night | I
found the PSL enclosure open (about |
|
10996
|
Tue Feb 10 16:01:21 2015 |
manasa | Update | General | AUX X fiber coupled 72% | Plan
C finally worked. We have
|
|
10997
|
Tue Feb 10 18:37:17 2015 |
ericq | Update | ASC | QPD ASC ready to go | I've remeasured the QPD ASC sensing
coefficients, and figured out what I did
weird with the actuation coefficients. I've |
 |
10998
|
Wed Feb 11 00:07:54 2015 |
rana | Update | LSC | Lock Loss plot | Here is a lock loss from around 11 PM tonight.
Might be due to poor PRC signals. |
 |
10999
|
Wed Feb 11 02:42:05 2015 |
Jenne | Update | LSC | PRC error signal RF spectra | Since we're having trouble keeping
the PRC locked as we reduce the CARM offset,
and we saw that the POP22 power is significantly |
 |
11000
|
Wed Feb 11 03:41:12 2015 |
Koji | Update | LSC | PRC error signal RF spectra | As the measurements have been done under
feedback control, the lower RF peak height
does not necessary mean |
|
11001
|
Wed Feb 11 04:08:53 2015 |
Jenne | Update | LSC | New Locking Paradigm? | [Rana, Jenne]
While meditating over what to do
about the fact that we can't seem to |
|
11002
|
Wed Feb 11 16:49:41 2015 |
rana | Update | elog | ELOGD restarted | No elog
response from outside and no elogd process
|
|
11003
|
Wed Feb 11 17:31:11 2015 |
ericq | Update | LSC | RFPD spectra | For future reference, I've taken spectra
of our various RFPDs while the PRMI was sideband
locked on REFL33, using a 20dB RF coupler |
   |
11004
|
Wed Feb 11 18:07:42 2015 |
ericq | Update | LSC | RFPD spectra | After some discussion with Koji, I've
asked Steve to order some SBP-30+ bandpass
filters as a quick and cheap way |
|
11006
|
Wed Feb 11 18:44:53 2015 |
manasa | Update | General | Optical fiber module | I have moved the optical fiber
module for FOL to the PSL table. It is setup
on the optical table right now for testing. |
|
11007
|
Wed Feb 11 22:13:44 2015 |
Jenne | Update | LSC | New Locking Paradigm - LSC model changes | In order to try out the new locking scheme
tonight, I have modified the LSC model.
Screens have not yet been made. |
|
11008
|
Thu Feb 12 01:00:18 2015 |
rana | Update | LSC | RFPD spectra | The nonlinearity in the LSC detection chain
(cf T050268)
comes from the |
|
11009
|
Thu Feb 12 01:43:09 2015 |
rana | Update | LSC | New Locking Paradigm - LSC model changes | With the |
|
11010
|
Thu Feb 12 03:43:54 2015 |
ericq | Update | LSC | 3F PRMI at zero ALS CARM | I have been able to recover the ability
to sit at zero CARM offset while the PRMI
is locked on RELF33 and CARM/DARM are on |
|
11011
|
Thu Feb 12 11:14:29 2015 |
Jenne | Update | LSC | New Locking Paradigm - Loop-gebra | I have calculated the response of this
new 2.5 loop system.
The first attachment is my block |
 |
11012
|
Thu Feb 12 11:59:58 2015 |
Koji | Update | LSC | New Locking Paradigm - Loop-gebra | The goals are:
- When the REFL path is
dead (e.g. S_REFL = 0), the system goes back |
|
11013
|
Thu Feb 12 12:16:04 2015 |
manasa | Update | General | Fiber shielding | [Steve, Manasa]
The fibers around the PSL table
were shielded to avoid any tampering. |
|
11014
|
Thu Feb 12 12:23:21 2015 |
manasa | Update | General | Waking up the PDFR measurement system | [EricG, Manasa]
We woke up the PDFR measurement
setup that has been sleeping since summer. |
|
11015
|
Thu Feb 12 15:21:37 2015 |
ericq | Update | Computer Scripts / Programs | netgpib updates | I've fixed the gpib scripts for the
SR785 and AG4395A to output data in the same
format as expected by older scripts when |
|
11016
|
Thu Feb 12 19:18:49 2015 |
Jenne | Update | LSC | New Locking Paradigm - Loop-gebra | EDIT, JCD, 17Feb2015: Updated loop
diagram and calculation: http://131.215.115.52:8080/40m/11043
Okay, Koji and I talked |
|
11017
|
Thu Feb 12 22:28:16 2015 |
Jenne | Update | LSC | New Locking Paradigm - LSC model changes, screens modified | I have modified the LSC trigger matrix
screen, as well as the LSC overview screen,
to reflect the modifications to the model |
|
11018
|
Thu Feb 12 23:40:12 2015 |
rana | Update | IOO | Bounce / Roll stopband filters added to MC ASC filter banks | |
|
11019
|
Thu Feb 12 23:47:45 2015 |
Koji | Update | LSC | 3f modulation cancellation | - I built another beat setup on the PSL
table at the South East side of the table.
- The main beam is not touched, no |
|
11020
|
Fri Feb 13 03:28:34 2015 |
rana | Update | LSC | New Locking Paradigm - Loop-gebra | Not
so fast!
In the drawing,
the FF path should actually be summed in |
|
11021
|
Fri Feb 13 03:44:56 2015 |
Jenne | Update | LSC | Held using ALS for a while at "0" CARM offset with PRMI | [Jenne, Rana]
We wanted to jump right in and
see if we were ready to try the new "ALS |
 |
11022
|
Fri Feb 13 14:27:30 2015 |
ericq | Update | Electronics | Second QPD Whitening Switch enabled | I have re-enabled the second whitening
stage switching on each quadrant of each
end's QPD whitening board, to try and |
|
11023
|
Fri Feb 13 14:59:13 2015 |
ericq | Update | Electronics | Second QPD Whitening Switch enabled | Went to zero CARM offset on ALS; transmission
QPDs are still saturating :(
Maybe we need to switch off all |
|
11024
|
Fri Feb 13 17:07:51 2015 |
Jenne | Update | Electronics | Second QPD Whitening Switch enabled | I first updated the DCC branches for the
Xend and Yend to reflect the as-built situation
from December 2014, and then I updated the |
|
11025
|
Fri Feb 13 18:56:44 2015 |
rana | Update | Electronics | Second QPD Whitening Switch enabled | Depends on the plots of the whitening I
guess; if its low freq sat, then we lower
the light level with ND filters. If its happening |
|
11026
|
Fri Feb 13 19:41:13 2015 |
ericq | Update | General | RF amplifier for ALS | As Koji found one of the spare channels
of the ALS/FOL RF amplifier box nonfunctional
yesterday, I pulled it out to fix it. I found |
|
11027
|
Sat Feb 14 00:42:02 2015 |
Koji | Update | General | RF amplifier for ALS | The RF analyzer was returned to the control
room. There are two beat notes from X/Y confirmed.
I locked the arms and aligned them |
|
11028
|
Sat Feb 14 00:48:13 2015 |
Koji | Update | LSC | 3f modulation cancellation | [SUCCESS]
The 3f sideband cancellation seemed worked
nicely. |
|
11030
|
Sat Feb 14 20:20:24 2015 |
Jenne | Update | LSC | ALS fool cartoon | The ALS fool scheme is now diagrammed up
in OmniGraffle, including its new official
icon. The mathematica notebook has |
 |
11037
|
Mon Feb 16 02:49:57 2015 |
Jenne | Update | LSC | ALS fool measured decoupling TF | I have measured very, very carefully the
transfer function from pushing on
MC2 to the Yarm ALS beatnote. |
 |
11038
|
Mon Feb 16 03:10:42 2015 |
Koji | Update | LSC | ALS fool measured decoupling TF | Wonkey shape: Looks like a loop supression.
Your http://nodus.ligo.caltech.edu:8080/40m/11016
also suggests it too, doesn't it? |
|