| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
2912
|
Tue May 11 17:02:43 2010 |
Kevin | Update | Green Locking | Green Laser Beam Profile |
|
|
|
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. |
|
|
2933
|
Fri May 14 16:14:37 2010 |
Kevin | Update | Green Locking | Green Laser Beam Profile |
|
|
|
9442
|
Wed Dec 4 21:41:09 2013 |
ericq | Update | Green Locking | Green PDH Characterization | My job right now is to characterize
the green PDH loops on each arm. Today, Jenne
took me around and pointed at the optics |
|
|
9447
|
Fri Dec 6 12:45:51 2013 |
ericq | Update | Green Locking | Green PDH Characterization | Yesterday, made a slew of measurements
on the X-arm when locked on green. By tweaking
the temperature loop offset and the green |
|
|
10446
|
Wed Sep 3 18:42:43 2014 |
Jenne | Update | LSC | Green PDH box boosts | From EricQ's simulations reported in elog
10390, we want to transition from ALS |
|
|
10448
|
Thu Sep 4 00:56:44 2014 |
Jenne | Update | LSC | Green PDH box boosts | Okay, went back to the drawing board with
Rana and Koji on PDH box stuff.
Currently (at least for the Yend), |
|
|
10450
|
Thu Sep 4 03:12:55 2014 |
ericq | Update | LSC | Green PDH box boosts | Jenne made her board modifications, and
the measured TF agreed with the design. Alas,
the green would not lock to the arm in this |
|
|
10452
|
Thu Sep 4 16:45:10 2014 |
Jenne | Update | LSC | Green PDH box boosts | As EricQ mentioned in last night's elog,
the modifications were made to the Yend (SN
17) uPDH board. |
|
|
10458
|
Fri Sep 5 05:32:57 2014 |
Jenne | Update | LSC | Green PDH box boosts | [Rana, Jenne, EricQ]
* Too much gain overall on Yend box,
needed attenuator on output to get lock. |
|
|
12097
|
Thu Apr 28 15:23:11 2016 |
ericq | Update | LSC | Green PDH demod lowpass | The 2F product out of the mixer is a natural
concern when demodulating. However, I think
this isn't so big of a deal in our green |
|
|
12098
|
Thu Apr 28 18:53:05 2016 |
rana | Update | LSC | Green PDH demod lowpass | OK - but give us a circuit diagram and
the expected before/after loop plots. Got
to make sure we keep the right impedance |
|
|
12101
|
Fri Apr 29 16:13:36 2016 |
ericq | Update | LSC | Green PDH demod lowpass | We can get
as much, if not more, attenuation of the
1F line in the mixer output that we get from |
|
|
12110
|
Fri May 6 16:42:12 2016 |
ericq | Update | LSC | Green PDH demod lowpass | I've build the filter, and it seems
to have the desired TF shape.
|
|
|
12111
|
Fri May 6 19:08:52 2016 |
rana | Update | LSC | Green PDH demod lowpass | Seems weird to design a PD lowpass with
a corner at the modulation frequency. Recall
what our strategy is with the other photodetectors |
|
|
12112
|
Sat May 7 09:40:40 2016 |
ericq | Update | LSC | Green PDH demod lowpass | As I was looking at filter designs, it
seemed difficult to get 40dB of supression
at 2F with a bandpass without going to a |
|
|
12113
|
Sun May 8 08:39:21 2016 |
rana | Update | LSC | Green PDH demod lowpass | Indeed. This is why the LSC PDs have a
2f notch in addition to the 1f resonance.
In recent versions, we also put a 2f notch |
|
|
10462
|
Fri Sep 5 21:13:57 2014 |
Jenne | Update | LSC | Green PDH out of loop | I locked the arms with IR, and measured
the beatnote spectra to get the out of loop
noise for the PDH boxes. |
|
|
10296
|
Wed Jul 30 10:16:54 2014 |
Andres | Update | 40m Xend Table upgrade | Green Steering Mirror Upgrade completed | Green Steering Mirror Update
Yesterday,
Nick and I completed the green steering mirrors
upgrade. I attached the file that contained |
|
|
4267
|
Thu Feb 10 00:23:25 2011 |
Jenne | Update | Green Locking | Green TRX DC PD installed on PSL | Using a stray beam that is generated as
the transmitted green beam from the Xarm
goes through the viewport to the PSL table, |
|
|
6855
|
Fri Jun 22 17:51:04 2012 |
Jenne | Update | Cameras | Green Trans camera repositioning attempt | [Yuta, Jenne]
We tried to find a different place,
not in the main green transmitted beam path, |
|
|
16844
|
Tue May 10 18:25:43 2022 |
Paco | Update | BHD | Green Transmission path | [Yuta, Paco]
We installed GRX_SM1,
GRX_SM2, and finished aligning |
|
|
12090
|
Tue Apr 26 23:19:42 2016 |
gautam | Update | endtable upgrade | Green aligned to arm - high order mode flashes seen | Attachment #1
Layout as of today. Most of the
green path is done. The Green REFL PD + PZT |
|
|
7347
|
Thu Sep 6 02:51:47 2012 |
Koji | Update | General | Green beam roughtly aligned (Re: Yarm aligned to IR incident beam) | The Y-End green beam was roughly aligned
by the steering mirrors for the green beam.
I couldn't understand the Y-End green |
|
|
11887
|
Wed Dec 16 18:34:40 2015 |
gautam | Update | Green Locking | Green beat channels temporarily set up as IR beat channels | Since there
are a few hours to go before the locking
efforts tonight, I've temporarily borrowed |
|
|
11888
|
Wed Dec 16 23:15:28 2015 |
ericq | Update | Green Locking | Green beat channels temporarily set up as IR beat channels | With the IR beats going to the nominal
ALS channels as Gautam left them, we're
able to measure the free running frequency |
|
|
4480
|
Thu Mar 31 20:46:11 2011 |
Aidan | Summary | Green Locking | Green beat note PD DC response | I measured the DC response of the Green
PD
|
|
|
12603
|
Mon Nov 7 17:24:12 2016 |
gautam | Update | Green Locking | Green beat setup on PSL table | I've been trying to understand the
green beat setup on the PSL table to see
if I can explain the abysmal mode-matching |
|
|
12609
|
Wed Nov 9 23:21:44 2016 |
gautam | Update | Green Locking | Green beat setup on PSL table | I tried to realize an improvement in the
mode matching onto the BBPDs by moving the
lens mentioned in the previous elog in this |
|
|
11700
|
Mon Oct 19 16:20:52 2015 |
ericq | Update | LSC | Green beatnote couplers installed | Last Friday, I installed some RF couplers
on the green BBPDs' outputs, and sent
them over to Gautam's frequency divider |
|
|
11714
|
Mon Oct 26 18:59:25 2015 |
gautam | Update | LSC | Green beatnote couplers installed | I found
(an old) 10 dB coupler in the RF component
shelves near MC2 - it has BNC connectors |
|
|
10372
|
Wed Aug 13 03:03:37 2014 |
ericq | Update | General | Green beatnote troubles | [Jenne, Rana, ericq]
No luck locking tonight, as spent
a while trying to figure out the complete |
|
|
3763
|
Fri Oct 22 18:15:21 2010 |
kiwamu | Update | Locking | Green era: found a green beat note finally | finally
we found it ! |
|
|
3766
|
Fri Oct 22 21:28:27 2010 |
Aidan | Update | Locking | Green era: found a green beat note finally | Nice work!
|
|
|
3800
|
Wed Oct 27 21:33:42 2010 |
Suresh | Update | Locking | Green from the far end re-obtained |
The
mirror which was moved during the mode matching |
|
|
17682
|
Thu Jul 13 15:48:34 2023 |
Jc | Update | General | Green laser at Y-End | [Yuta, JC]
Yuta and I tested |
|
|
17683
|
Thu Jul 13 17:05:10 2023 |
Koji | Update | General | Green laser at Y-End | The LED blinking on the head is normal.
We can ignore that.
It is likely that the controller |
|
|
17685
|
Thu Jul 13 19:34:08 2023 |
Koji | Update | General | Green laser at Y-End | Borrowed an NPRO controller from
Liyuan @ Downs B138
Model M125/6-OPN-PA |
|
|
12085
|
Thu Apr 21 14:25:52 2016 |
gautam | Update | endtable upgrade | Green light recovered | I've made progress on the new layout
up to the doubling oven. After doing the
coarse alignment with the diode current to |
|
|
1941
|
Tue Aug 25 03:30:23 2009 |
Yoichi | Summary | WIKI-40M Update | Green lock and phase noise | While Koji and I were discussing about the
green laser lock, we wondered if the common
motion of the cavity mirrors,
|
|
|
8133
|
Thu Feb 21 19:55:02 2013 |
Manasa | Update | Locking | Green locking in arms | [Yuta, Manasa]
We have |
|
|
7241
|
Tue Aug 21 01:59:33 2012 |
Jenne | Update | Green Locking | Green locking needs help! | The green beam for the Xarm is flashing
a pretty nice 00 mode, but isn't catching
lock. |
|
|
2835
|
Fri Apr 23 18:30:49 2010 |
Aidan, Jenne, Koji | Summary | Green Locking | Green means GO! | Jenne, Koji and I assembled the Covesion
Oven today, inserted a PPKTP crystal from
Raicol, aligned the crystal to a 50mW focus |
|
|
16883
|
Tue May 31 17:30:01 2022 |
Yehonathan | Update | BHD | Green shutters fixed | [Paco, Yehonathan]
We fixed the slow control over
the green beam shutters. |
|
|
9405
|
Tue Nov 19 00:07:16 2013 |
Jenne | Update | LSC | Green status | After I aligned the IR interferometer (no
ASS - we still need to figure out what's
going on with that), I am trying to find |
|
|
9407
|
Tue Nov 19 01:11:19 2013 |
Jenne | Update | LSC | Green status | I am able to lock the Yarm ALS, but not
at the full gain that I should be.
I attribute this to my mediocre alignment |
|
|
9411
|
Tue Nov 19 14:47:59 2013 |
manasa | Update | LSC | Green status |
|
|
|
8958
|
Thu Aug 1 22:49:31 2013 |
manasa | Update | General | Green status after PR3 flipping investigated | [EricQ, Koji, Manasa]
We opened the BS chamber to check
the status of the green beams. The X green |
|
|
1994
|
Wed Sep 23 17:32:37 2009 |
rob | AoG | Computers | Gremlins in the RFM | A cosmic ray struck the RFM in the framebuilder
this afternoon, causing hours of consternation.
The whole FE system is just now coming back |
|