ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
10867
|
Wed Jan 7 12:15:17 2015 |
manasa | Update | General | New RF cables | I was
working around the PSL table this morning.
1. I have fibers running from |
|
10871
|
Wed Jan 7 14:41:46 2015 |
Steve | Update | General | Ophir pmeter filter found |
|
|
10873
|
Wed Jan 7 19:49:09 2015 |
manasa | Update | General | X end space issues | I have attached a photo of the ETMX table.
The path of the 1064nm light rejected after
the doubler and the green light are indicated |
|
10874
|
Wed Jan 7 21:13:35 2015 |
rana | Update | General | inane LSCoffsets script removed |
|
|
10880
|
Thu Jan 8 19:41:50 2015 |
ericq | Update | General | inane LSCoffsets script removed | The restored offset script used old tdsavg
calls that our workstations can't do,
and didn't include things like the transmon |
|
10883
|
Fri Jan 9 14:01:17 2015 |
manasa | Update | General | AUX Y + PSL beat note at 1064nm | I
worked around the PSL table today.
The Y+PSL output from the optical |
|
10884
|
Fri Jan 9 14:13:02 2015 |
manasa | Update | General | ALS noise at ~30Hz | Before starting to move things around the
PSL table, I measured the ALS out of loop noise |
 |
10893
|
Tue Jan 13 10:28:02 2015 |
manasa | Update | General | AUX Y + PSL beat note at 1064nm |
|
|
10894
|
Tue Jan 13 13:22:54 2015 |
Jenne | Update | General | AUX Y + PSL beat note at 1064nm: needs work | I'm super excited about this new frequency
readback, but I'm |
|
10895
|
Tue Jan 13 14:01:20 2015 |
manasa | Update | General | AUX Y + PSL beat note at 1064nm: needs work |
|
|
10918
|
Sat Jan 17 15:07:28 2015 |
manasa | Update | General | Beat note frequency discrepancy | I
was around the PSL table and the X end table
today. |
|
10919
|
Mon Jan 19 11:03:32 2015 |
manasa | Update | General | RF connections to adder | RF connections to the beat note adder on
the IOO rack have been undone and it
should be good to proceed with any locking |
|
10955
|
Thu Jan 29 10:14:21 2015 |
manasa | Update | General | X end space issues | It is certain that we have space issues
at the X end that has been preventing us
from sticking in a lens to couple light into |
 |
10956
|
Thu Jan 29 11:59:48 2015 |
manasa | Update | General | Beat note frequency discrepancy | Below is the set of plots comparing measurements
for the green and IR beat notes frequencies.
The measurements were made on the spectrum |
 |
10957
|
Thu Jan 29 16:14:10 2015 |
manasa | Update | General | Updated to do list for FOL | Since there will be some work that supposedly
will involve moving stuff on the table and
racks; here is the updated to-do list for |
|
10964
|
Mon Feb 2 16:58:56 2015 |
manasa | Update | General | RF amplifier for ALS | Today I was around the IOO rack.
I shutdown the power to the beat
PDs on the PSL table and disconnected the |
|
10970
|
Tue Feb 3 16:43:48 2015 |
manasa | Update | General | RF amplifier for ALS | I pulled out the RF amplifier box from
the IOO rack again and added the new
RF amplifiers for FOL. |
|
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. |
|
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. |
|
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 |
|
10996
|
Tue Feb 10 16:01:21 2015 |
manasa | Update | General | AUX X fiber coupled 72% | Plan
C finally worked. We have
|
|
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. |
|
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. |
|
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 |
|
11058
|
Mon Feb 23 15:04:10 2015 |
Zach | Update | General | Elog restarted | The elog crashed while I was creating
an entry to the Cryo log. I restarted it
with the |
|
11075
|
Thu Feb 26 10:56:34 2015 |
manasa | Update | General | Running cables | [Steve, Manasa]
We ran power cables and sma cables
for the FOL fiber module from the PSL table |
|
11079
|
Thu Feb 26 16:46:37 2015 |
manasa | Update | General | IOO rack power supply | I shutdown the +/-15V and the +/-24V sorensons
on the IOO rack to connect the FOL RF PDs
to the rack power supply. |
|
11101
|
Thu Mar 5 11:18:28 2015 |
manasa | Update | General | RF amplifier box | I pulled out the RF amplifier box from
the IOO rack and swapped the amplifiers
for FOL beat frequency amplification. The |
|
11102
|
Thu Mar 5 12:27:27 2015 |
manasa | Update | General | FOL fiber box on the PSL table | Working
around the PSL table
I have put the FOL |
|
11110
|
Fri Mar 6 14:29:59 2015 |
manasa | Update | General | FOL troubleshooting | [EricQ, Manasa]
Domenica:
Since Domenica |
|
11111
|
Fri Mar 6 14:51:59 2015 |
ericq | Update | General | X arm linewidth, loss | The fit FWHM is 10.444kHz
+-55Hz. |
|
11123
|
Mon Mar 9 14:43:31 2015 |
manasa | Update | General | FOL troubleshooting | Figuring out the problem with
frequency counter readouts:
|
  |
11128
|
Tue Mar 10 17:48:07 2015 |
manasa | Update | General | FOL troubleshooting | [Koji, Manasa]
This problem was solved by changing
the Frequency Counter range settings. |
|
11131
|
Wed Mar 11 13:54:18 2015 |
Steve | Update | General | temporaly storage in the east arm | Green glass for aLIGO OMC shield is temporarly
stored in the inside of the Y-arm. |
 |
11132
|
Wed Mar 11 15:35:38 2015 |
manasa | Update | General | Waking up the PDFR measurement system | I was around the 1Y1 rack today. Trials
were done to get the PDFR of AS55.
|
|
11135
|
Wed Mar 11 19:48:25 2015 |
Koji | Update | General | FOL troubleshooting | There is a frequency counter code written
by the summer student.
The code needed some cleaning up. |
|
11137
|
Thu Mar 12 11:57:38 2015 |
Koji | Update | General | FOL troubleshooting | BTW, during this trouble shoot, we looked
at the IR beatnote spectrum between the Xend
and the PSL. |
|
11164
|
Tue Mar 24 10:53:30 2015 |
manasa | Update | General | Scripts updated to the svn | I found that the scripts in FOL and PDFR
directories were not in the svn. These were
added to the svn. |
|
11171
|
Wed Mar 25 18:27:34 2015 |
Koji | Summary | General | Some maintainance | - I found that the cable for the AS55 LO
signal had the shielding 90% broken. It was
fixed. |
|
11209
|
Wed Apr 8 21:10:55 2015 |
manasa | Update | General | Waking up the PDFR measurement system | I was poking around with the PDFR hardware today.
I moved the Agilent which had its
screen projected on the monitor. I have put |
|
11235
|
Wed Apr 22 11:48:30 2015 |
manasa | Summary | General | Delay line frequency discriminator for FOL error signal | Since the Frequency counters have not been
a reliable error signal for FOL PID loop,
we will put together an analog delay line |
|
11236
|
Wed Apr 22 14:56:18 2015 |
manasa | Summary | General | Delay line frequency discriminator for FOL error signal | [Koji, Manasa]
Since the bandwidth of the fiber
PD is ~ 1GHz, we could design the frequency |
|
11239
|
Thu Apr 23 15:40:41 2015 |
Steve | Update | General | torque for 1/4-20 |
Few 1/4 -20 socket cap head screw
with washers were tested for optimum torque. |
 |
11244
|
Fri Apr 24 18:13:36 2015 |
rana | Update | General | torque for 1/4-20 | For 1/4-20 bolts made of 18-8 Stainless
Steel, the recommended torque varies
from 65-100 inch-pounds, depending upon the |
|
11257
|
Sun Apr 26 20:10:10 2015 |
max isi | HowTo | General | Summary pages | I have set up new summary pages for the
40m: http://www.ligo.caltech.edu/~misi/summary/
This website shows plots (time series, |
|
11270
|
Mon May 4 10:21:09 2015 |
manasa | Summary | General | Delay line frequency discriminator for FOL error signal | Attached is the schematic of the analog
DFD and the plot showing the zero-crossing
for a delay line length of 27cm. The bandwidth |
 |
11272
|
Mon May 4 12:42:34 2015 |
manasa | Summary | General | Delay line frequency discriminator for FOL error signal | Koji suggested that I make a cosine fit
for the curve instead of a linear
fit. |
|