| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10290
|
Tue Jul 29 20:14:08 2014 |
Andres | Update | 40m Xend Table upgrade | Xarm Green steering mirror upgrade | Xarm Green Steering Mirror Upgrade
Nick
and I did the upgrade for the green steering
mirror today. |
|
|
10291
|
Tue Jul 29 20:14:10 2014 |
Koji | Update | 40m Xend Table upgrade | Xarm Green steering mirror upgrade | That
was super fast! Great job, Andres and Nic! |
|
|
10422
|
Fri Aug 22 03:55:45 2014 |
Jenne | Update | LSC | Xarm PDH fine, Yarm PDH/ALS needs work | [Rana, Jenne, EricQ]
We did several things tonight.
First, a list (so I can remember them all), |
|
|
10191
|
Sun Jul 13 17:06:35 2014 |
Andres | Update | 40m Xend Table upgrade | Xarm Table Upgrade Calculation and Diagrams of possible new table layout | Current Mode Matching
and Gouy Phase Between Steering Mirrors |
|
|
8624
|
Thu May 23 01:27:11 2013 |
Manasa | Summary | LSC | Xarm beat note search continues | Towards finding the x-arm beat note:
The green would not lock to a maximum |
|
|
8629
|
Thu May 23 13:14:34 2013 |
Koji | Summary | LSC | Xarm beat note search continues | We should consider to hook up the temperature
monitors of the NPROs to the ADCs. |
|
|
14424
|
Wed Jan 30 19:25:40 2019 |
gautam | Update | SUS | Xarm cavity alignment | Squishing cables at the ITMX satellite
box seems to have fixed the wandering ITM
that I observed yesterday - the sooner we |
|
|
1472
|
Fri Apr 10 19:10:53 2009 |
Jenne | Update | General | Xarm locked? | I don't know who left the X arm locked,
but I just ran the Align Full IFO script,
so everything is good in case Yoichi/someone |
|
|
8203
|
Fri Mar 1 01:17:06 2013 |
Jenne | Update | LSC | Xarm oscillation | There is an oscillation in the Xarm at
631Hz, which is not in the Yarm. There
is a small peak in POY11_I at this frequency, |
|
|
8208
|
Fri Mar 1 16:58:37 2013 |
yuta | Update | LSC | Xarm oscillation stopped | POX11 oscillation at 630 Hz was stopped
by installing 630 Hz resonant gain to LSC_XARM.
After few hours, oscillation stopped. |
|
|
8210
|
Sat Mar 2 00:09:31 2013 |
rana | Update | LSC | Xarm oscillation stopped | Don't use resonant gain - it
can lead to a loop instability since it makes
the loop have 3 UGFs. |
|
|
8297
|
Thu Mar 14 20:22:33 2013 |
Jenne | Update | Green Locking | Xbeat attempt | I aligned the Xgreen and PSL green to overlap
on the X beat PD, and reconnected the splitter
which combines the X and Y beat signals and |
|
|
16194
|
Wed Jun 9 11:46:01 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF measurement | We measured the Xend green laser PDH Open
loop transfer function by following method:
We first measured the feedback |
|
|
16197
|
Thu Jun 10 14:01:36 2021 |
Anchal | Summary | AUX | Xend Green Laser PDH OLTF measurement loop algebra | Attachment 1 shows the closed loop of Xend
Green laser Arm PDH lock loop. Free running
laser noise gets injected at laser head after |
|
|
16202
|
Tue Jun 15 15:26:43 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF measurement loop algebra, excitation at control point | Attachment 1 shows the case when excitation
is sent at control point i.e. the PZT output.
As before, free running laser noise |
|
|
16213
|
Fri Jun 18 10:07:23 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF with coherence | We did the measurement of OLTF for Xend
green laser PDH loop with excitation added
at control point using a SR560 as shown in |
|
|
8607
|
Tue May 21 18:18:23 2013 |
Manasa | Update | Green Locking | Xend Green aligned | X arm aligned to green.
Aligned the X arm to IR.
Used steering mirrors to align the |
|
|
8610
|
Tue May 21 23:29:57 2013 |
Manasa | Update | Green Locking | Xend Green aligned | X-green and PSL green have been aligned
so that they interfere at the beat PD for
X. |
|
|
16322
|
Mon Sep 13 15:14:36 2021 |
Anchal | Update | LSC | Xend Green laser injection mirrors M1 and M2 not responsive | I was showing some green laser locking
to Tega, I noticed that changing the PZT
sliders of M1/M2 angular position on Xend |
|
|
8569
|
Tue May 14 01:56:20 2013 |
Jenne | Update | Green Locking | Xend Green tweaked | I locked the Xarm on green. At the
PSL table, I adjusted the steering mirror
to get the beam centered on the GTRX DC PD. |
|
|
8570
|
Tue May 14 02:19:13 2013 |
Koji | Update | Green Locking | Xend Green tweaked | Note that I'm supposed to return one of
the two green beat PDs and the power supply.
|
|
|
9367
|
Tue Nov 12 16:49:22 2013 |
Jenne | Update | LSC | Xend QPD and Whitening board pulled |
|
|
|
9418
|
Wed Nov 20 17:05:15 2013 |
Jenne | Update | LSC | Xend QPD and Whitening board replaced | [EricQ, Jenne]
We have put the Xend QPD back in
place, and centered it. The whitening |
|
|
9484
|
Wed Dec 18 00:26:15 2013 |
Jenne | Update | LSC | Xend QPD schematic investigation | I have looked at the photo of the Xend
QPD from elog
9367, as well as the schematic for the |
|
|
9486
|
Wed Dec 18 11:32:34 2013 |
rana | Update | LSC | Xend QPD schematic investigation |
Since we use the TransMon QPD
for triggering the high/low gain switching |
|
|
10794
|
Fri Dec 12 19:54:21 2014 |
Jenne | Update | Electronics | Xend QPD whitening board modified | Okay, I have finished modifying the Xend
QPD whitening board, although I will likely
need to change the gain on Monday. |
|
|
10795
|
Sat Dec 13 00:35:11 2014 |
rana | Update | Electronics | Xend QPD whitening board modified |
16 bit. There aren't any 14-bit
ADCs anywhere in LIGO. The aLIGO suspensions |
|
|
10774
|
Wed Dec 10 15:05:32 2014 |
Jenne | Update | Electronics | Xend QPD whitening board modified already | In April, Koji logged that he had made
some changes to the Yend QPD whitening board
(elog |
|
|
10782
|
Thu Dec 11 16:42:12 2014 |
Jenne | Update | Electronics | Xend QPD whitening board plan | Here is a little PDF of what I plan to
do to both of the transmission QPD whitening
boards later today. The idea is to |
|
|
7180
|
Tue Aug 14 16:19:12 2012 |
Jenne | Update | Green Locking | Xend doubling crystal heater unplugged, replugged | I went down to the Xend table to look at
it to understand Steve's proposal, and I
noticed that the doubling crystal's heater's |
|
|
9025
|
Mon Aug 19 09:36:32 2013 |
Koji | Update | Green Locking | Xend green aligned | [Rana Koji]
This is an elog about the activity
on Friday night. |
|
|
9031
|
Mon Aug 19 14:22:36 2013 |
rana | Update | Green Locking | Xend green aligned | |
|
|
9033
|
Mon Aug 19 16:18:56 2013 |
manasa | Update | Green Locking | Xend green aligned | ASX scripts for PZT dither have been fixed
appropriately. Script resides in |
|
|
9034
|
Mon Aug 19 17:40:32 2013 |
Steve | Update | Green Locking | Xend green layout corrections | Shutter moved, no more clipping.
Pick-off mirror 2" replaced
by 1" one. Laseroptik HR 532nm, incident |
|
|
9035
|
Mon Aug 19 19:08:35 2013 |
Koji | Update | Green Locking | Xend green layout corrections | - An Aluminum mirror instead of 2"
unknown mirror for the pick-off for the rejected
beam from the green faraday isolator (Steve) |
|
|
9039
|
Tue Aug 20 10:59:15 2013 |
Steve | Update | Green Locking | Xend green layout corrections |
|
|
|
9083
|
Wed Aug 28 11:15:02 2013 |
Steve | Update | Green Locking | Xend green layout corrections |
|
|
|
16200
|
Mon Jun 14 18:57:49 2021 |
Anchal | Update | AUX | Xend is unbearably hot. Green laser is loosing lock in 10's of seconds | Working in Xend with mask on has become
unbearable. It is very hot there and I would
really like if we fix this issue. |
|
|
6371
|
Wed Mar 7 11:44:29 2012 |
Jenne | Update | Green Locking | Xgreen beatnote cable made, laid | The Xgreen PD now has a cable going over
to the beatbox. Once beatbox characterization
is done I can re-find the beat, and we can |
|
|
6842
|
Thu Jun 21 01:58:29 2012 |
Jenne | Update | Green Locking | Xgreen preparations | [Yuta, Koji, Jenne]
Lots
of small things happened tonight, in preparation |
|
|
7261
|
Thu Aug 23 21:53:06 2012 |
Jenne | Update | Green Locking | Xgreen still wouldn't lock | [Jenne, Jamie]
We took a look at the Xend green,
and we weren't able to make it lock. |
|
|
7266
|
Thu Aug 23 22:54:32 2012 |
Jenne | Update | Green Locking | Xgreen still wouldn't lock |
|
|
|
10638
|
Fri Oct 24 10:08:24 2014 |
manasa | Update | General | Y AUX laser - fiber coupled | The Y end aux laser light
leaking after the doubling crystal has been |
|
|
10639
|
Fri Oct 24 18:53:23 2014 |
rana | Update | General | Y AUX laser - fiber coupled | 10% seems like a pretty bad coupling
efficiency, even for a single lens. I know
that the NPRO itself isn't so elliptical |
|
|
10650
|
Wed Oct 29 11:45:11 2014 |
manasa | Update | General | Y AUX laser - fiber coupled (52%) |
|
|
|
10640
|
Mon Oct 27 12:17:46 2014 |
manasa | Update | General | Y AUX laser coupling telescope design | Since I obtained a poor coupling efficiency
from the earlier setup, I went back to calculate
the coupling efficiency of the current setup. |
|
|
2186
|
Thu Nov 5 23:09:34 2009 |
Alberto | Update | LSC | Y Arm Cavity Transfer Function | As for the X Arm, this the transfer function
I measured for the Y arm cavity.
|
|
|
2188
|
Fri Nov 6 00:24:06 2009 |
Alberto | Update | LSC | Y Arm Cavity Transfer Function |
|
|
|
9688
|
Mon Mar 3 23:16:06 2014 |
rana | Update | LSC | Y Arm Loop Shape found to be weird: changed now | I was getting the Y Arm ready for
Eric Q's loss measurements and so I looked
at the noise and loop shape. The loop shape |
|
|
8886
|
Mon Jul 22 03:09:51 2013 |
Annalisa | Update | Green Locking | Y Arm cavity scan | Yesterday and today I was in the lab doing
many cavity scan.
First I did many measurement with |
|