| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1449
|
Wed Apr 1 15:47:48 2009 |
Yoichi | Update | Locking | 3.8kHz peak looks like a real optical response of the interferometer | Yoichi, Peter
To see where the 3.8kHz peak comes from, |
|
|
1450
|
Wed Apr 1 16:14:36 2009 |
Yoichi | Update | Locking | 3.8kHz peak does not change with SRC offset | Yoichi, Peter
We suspected that maybe the 3.8kHz peak is |
|
|
1433
|
Thu Mar 26 04:27:26 2009 |
Yoichi | Update | Locking | 3.8kHz peak as a function of the arm power | During the power ramp-up, I actuated CARM
using ETMs and measured the transfer functions
to the PO_DC at several arm powers.
|
|
|
580
|
Thu Jun 26 22:08:33 2008 |
Jenne | Update | Electronics | 3.7MHz bandstop filter in MC Servo | The 3.7MHz elliptical bandstop filter that
I made during my SURF summer is now installed
in the MC servo loop to reduce the noise |
|
|
8526
|
Fri May 3 08:55:55 2013 |
Steve | Update | PEM | 3.2 M earthquake | |
|
|
15929
|
Wed Mar 17 10:52:48 2021 |
Jordan | Update | SUS | 3" Ring Adpater for SOS | I have added a .1", 45deg chamfer
to the bottom of the adapter ring. This was
added for a new placement of the eq stops, |
|
|
9549
|
Mon Jan 13 11:08:48 2014 |
Steve | Update | PSL | 3 good days of IOO pointing | Three good days of IOO pointing:
Friday, Sat and Sun What
was changed? May be the clamping on |
|
|
5970
|
Mon Nov 21 16:08:04 2011 |
kiwamu | Update | Green Locking | 2nd trial of Y arm ALS noise budget : broad band noise gone |
|
|
|
1872
|
Mon Aug 10 14:58:01 2009 |
Jenne | Update | PEM | 2nd set of Guralp channels plugged into ADCU | The second set of Guralp channels is now
plugged into the PEM ADCU, into channels
which are confirmed to be working. |
|
|
1882
|
Mon Aug 10 18:12:25 2009 |
Jenne | Update | PEM | 2nd set of Guralp channels plugged into ADCU |
|
|
|
3676
|
Fri Oct 8 07:41:42 2010 |
steve | Configuration | SAFETY | 2W laser shutter is closed | The 2 W Innolight shutter is closed and
enclosure door removed. Beam path blocked.
Do not change this condition. |
|
|
3677
|
Fri Oct 8 10:38:03 2010 |
steve | Configuration | SAFETY | 2W laser shutter is closed |
|
|
|
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. |
|
|
2837
|
Sat Apr 24 15:05:41 2010 |
Kevin | Update | PSL | 2W Vertical Beam Profile | The vertical beam profile of the Innolight
2W laser was measured at eight points along
the axis of the laser. |
|
|
3041
|
Wed Jun 2 22:58:04 2010 |
Kevin | Update | PSL | 2W Second Reflected Beam Profile | [Koji, Kevin]
The profile of the Innolight 2W was
previously measured by measuring the reflected |
|
|
3725
|
Thu Oct 14 23:33:45 2010 |
Suresh | Update | IOO | 2W NPRO laser output power versus temperature | Steve
measured an apparent power drop in the 2W
NPRO output from 2.1W to 1.6W(elog entry |
|
|
3726
|
Fri Oct 15 00:15:52 2010 |
Koji | Update | IOO | 2W NPRO laser output power versus temperature | From the plot, you observed the reduction
of the output power only by 1% between 25deg
to 45deg. |
|
|
3730
|
Fri Oct 15 21:25:23 2010 |
Suresh | Update | IOO | 2W NPRO laser output power drop question | The power meter used in the measurements
of elog entries 2822, 3698 and 3709 was the
Ophir PD300-3W. This power head has |
|
|
3491
|
Mon Aug 30 23:21:36 2010 |
rana | HowTo | PSL | 2W NPRO Mount designed with emachineshop.com software | To test out this website - emachineshop.com,
Jenne and I are designing some of the mounts
for the new beam height. |
|
|
3503
|
Wed Sep 1 08:36:59 2010 |
Koji | HowTo | PSL | 2W NPRO Mount designed with emachineshop.com software | 1. I can not see whether the attaching
surface is flat or not.
It should have ~1mm step to avoid |
|
|
3042
|
Thu Jun 3 00:47:17 2010 |
Kevin | Update | PSL | 2W Beam Profile of Second Reflected Beam | [Koji, Kevin]
The profile of the Innolight 2W was |
|
|
3030
|
Wed Jun 2 03:24:22 2010 |
Kevin | Update | PSL | 2W Beam Profile | [Rana, Kiwamu, Kevin]
The Innolight 2W beam profile was
measured with the beam scan. A W2-IF-1025-C-1064-45P |
|
|
3032
|
Wed Jun 2 04:27:02 2010 |
Koji | Update | PSL | 2W Beam Profile | This is what I already told to Kevin and
Rana:
A direct output beam is |
|
|
566
|
Wed Jun 25 12:25:28 2008 |
Eric | Summary | Cameras | 2D Gaussian Fitting Code | I initially wrote a script in MATLAB that
takes pictures of the laser beam's profile
and fits them to a two dimensional gaussian |
|
|
12801
|
Sun Feb 5 21:56:50 2017 |
Lydia | Update | IMC | 29.5 MHz stabilizer box replacement | Since the "stablizer box" doesn't
really need to stabilize, it just needs to
amplify, I decided to replace it with an |
|
|
12807
|
Tue Feb 7 12:01:10 2017 |
Lydia | Update | IMC | 29.5 MHz stabilizer box replacement | I tested the amplifier with the Agilent
network analyzer and measured 19.5 dB
of gain between 29 and 30 mHz. The phase |
|
|
12809
|
Tue Feb 7 17:00:55 2017 |
Lydia | Update | IMC | 29.5 MHz stabilizer box replacement | I set everything up and connected it as
shown on the block diagram attached to the
previous entry, with the exception |
|
|
12816
|
Fri Feb 10 02:14:10 2017 |
gautam | Update | IMC | 29.5 MHz stabilizer box replacement | Lydia finished up installing the new RF
amplifier, and will elog the details of the
installation. |
|
|
12817
|
Fri Feb 10 11:41:43 2017 |
Lydia | Update | IMC | 29.5 MHz stabilizer box replacement | To install the replacement amplifier, I
did the following:
Mounted the amplifier in |
|
|
12819
|
Fri Feb 10 13:24:28 2017 |
rana | Update | IMC | 29.5 MHz stabilizer box replacement | To remind myself about how to put filter
caps on the mini-circuits RF Amps, I looked
at Koji's recent |
|
|
12755
|
Wed Jan 25 15:41:29 2017 |
Lydia | Update | IMC | 29.5 MHz modulation depth measurement plan | [Lydia, gautam]
To measure the modulation depth
of the 29.5 MHz sideband, we plan to connect |
|
|
12756
|
Wed Jan 25 17:30:03 2017 |
Koji | Update | IMC | 29.5 MHz modulation depth measurement plan | I'm afraid that the bidirectional coupler,
designed to be 50ohm in/out, disturbs the
resonant circuit designed for the EOM which |
|
|
12758
|
Wed Jan 25 19:39:07 2017 |
gautam | Update | IMC | 29.5 MHz modulation depth measurement plan | Just collecting some links from my elog
searching today here for easy reference later.
EOM datasheet: Newfocus |
|
|
12767
|
Fri Jan 27 21:25:11 2017 |
Lydia | Update | IMC | 29.5 MHz modulation depth | [gautam, Lydia]
We set out to measure the 29.5
MHz power going to the EOM today but decided |
|
|
12768
|
Sat Jan 28 01:25:51 2017 |
gautam | Update | IMC | 29.5 MHz modulation depth | Some more details of our investigation:
Here is a spectrum of the
signal to the power combiner on the PSL table, |
|
|
2801
|
Thu Apr 15 14:47:28 2010 |
steve | Update | Electronics | 25MHZ oscillation of HP4195A | The 1979 vintage RF spectrum analyzer HP4195A
sn2904J01587 shipped out for repair
today to http://www.avalontest.com |
|
|
16211
|
Thu Jun 17 22:19:12 2021 |
Koji | Update | Electronics | 25 HAM-A coil driver units delivered | 25 HAM-A coil driver units
were fabricated by Todd and I've transported
them to the 40m. |
|
|
12660
|
Fri Dec 2 16:40:29 2016 |
gautam | Update | IMC | 24V fuse pulled out | I've pulled out the 24V fuse block
which supplies power to the AOM RF driver.
The way things are set up on the PSL table, |
|
|
623
|
Wed Jul 2 13:56:10 2008 |
Rob, Yoichi, John | Update | Locking | 24.5 Hz resonance | Work continues on trying to reduce the CARM
offset using dc signals from PO_DC. Got up
to arm powers of
|
|
|
6359
|
Mon Mar 5 20:31:33 2012 |
Koji | Update | LSC | 22/110MHz path for POP | This a kind of self record...
We need an RF setup at POP to extract
22 and 110 MHz components separately. |
|
|
6366
|
Tue Mar 6 22:23:04 2012 |
Koji | Update | LSC | 22/110MHz path for POP |
As par Kiwamu's request, RF
filters for POP22 and POP110 were installed. |
|
|
6374
|
Wed Mar 7 15:56:36 2012 |
Koji | Update | LSC | 22/110MHz path for POP | The RF separator installed comprises of
the Minicircuits filters cascaded as in the
figure below. |
|
|
8192
|
Wed Feb 27 20:50:41 2013 |
Manasa | Update | LSC | 22/110MHz path for POP | [Yuta, Manasa]
Modified POP path. |
|
|
8397
|
Tue Apr 2 23:14:02 2013 |
rana | Update | LSC | 22/110MHz path for POP |
|
|
|
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 |
|
|
13544
|
Fri Jan 12 20:35:34 2018 |
Udit Khandelwal | Summary | General | 2018/01/12 Summary |
40m Lab CAD
Worked |
|
|
12055
|
Wed Mar 30 16:40:24 2016 |
ericq | Update | LSC | 2016 vs 2010 | I haven't found any data files for
the DARM spectrum of the previous generation
of 40m, but with some GIMP-fu, I have plotted |
|
|
9730
|
Mon Mar 17 10:50:58 2014 |
steve | Update | safety | 2014 annual crane certification |
|
|
|
4651
|
Fri May 6 10:20:00 2011 |
steve | Summary | SAFETY | 2011 safety audit | The emphasis of this annual safety audit
was on safe electrical housekeeping
on March 3, 2011 |
|