| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11998
|
Thu Feb 18 02:52:27 2016 |
ericq | Update | IOO | Some housekeeping | I manually aligned the IMC. Spot positions
are all < 1.5mm. PMC trans of ~0.74, MC2
Trans of ~15400, MC Refl ~0.4, which is better |
|
|
11997
|
Wed Feb 17 13:45:15 2016 |
ericq | Update | General | No monit on frontends | daqd has indeed continued to be unstable.
I found system times had drifted apart again...
I think something weird happened in the booting |
|
|
11996
|
Wed Feb 17 09:05:07 2016 |
Steve | Update | VAC | forepump replaced | TP3 drypump replaced after 10,344 hrs at
750 mTorr foreline pressure.
The foreline pressure is 13 mTorr |
|
|
11995
|
Tue Feb 16 23:42:22 2016 |
gautam | Update | General | Power Glitch recovery - arms recovered | I was able to realign the arms, lock
them, and have run the dither align to maximize
IR transmission - looks like things are back |
|
|
11993
|
Tue Feb 16 15:02:19 2016 |
ericq | Update | General | Power Glitch recovery | Chiara reports an uptime of >195 days,
so its UPS is working fine |
|
|
11992
|
Tue Feb 16 09:13:39 2016 |
Steve | Update | General | there was a power outage & EQ | Pasadena reported the Sunday night event
as a power transient caused by the trip of
a power transmission line. This affected |
|
|
11991
|
Mon Feb 15 13:09:33 2016 |
Koji | Update | General | Something has gone wrong - was there a power outage? | Looks like that's the case. LIGO GC
also sent an e-mail that there was a popwer
glitch. |
|
|
11990
|
Mon Feb 15 12:28:03 2016 |
gautam | Update | General | Something has gone wrong - was there a power outage? | I came into the 40m a few minutes ago,
and noticed the following (approximately
in this order): |
|
|
11989
|
Fri Feb 12 19:07:52 2016 |
Koji | Update | Green Locking | Laser swap - green light recovered but no flashes in the arm | 800e-6 / 0.225^2 = 0.016
=> 1.6%/W
I thought Kiwamu had roughtly 2%/W. |
|
|
11988
|
Fri Feb 12 17:05:40 2016 |
gautam | Update | Green Locking | Laser swap - green light recovered but no flashes in the arm | After carefully tweaking the mode-matching
of the IR into the crystal and the four-axis
translation stage on which the doubling oven |
|
|
11987
|
Fri Feb 12 11:10:49 2016 |
Steve | Update | Green Locking | Innolight laser is 10 years old | It shipped out for repair evaluation.
Arrived to Hayward,CA 2016Feb16
|
|
|
11986
|
Thu Feb 11 14:28:50 2016 |
Steve | Update | Treasure | 091415 declared |
Beautifully Done
|
|
|
11985
|
Wed Feb 10 17:57:15 2016 |
gautam | Update | Green Locking | Laser swap - updates | After the discussion at the meeting, I
decided to go ahead and open the top of the
oven so that I could get a visual on where |
|
|
11984
|
Tue Feb 9 19:15:36 2016 |
gautam | Update | Green Locking | Laser swap - updates | Some updates on the laser swap situation:
Mode-matching calculation:
I
should have caught this earlier, but it was |
|
|
11983
|
Tue Feb 9 11:49:47 2016 |
gautam | Update | Green Locking | Laser swap initiated | Steve pointed me to an old
elog by Zach where he had measured the
waist of the 1W Innolight NPRO. I ran |
|
|
11982
|
Tue Feb 9 04:37:10 2016 |
ericq | Update | Green Locking | Laser swap initiated | [ericq, Gautam]
Tonight we embarked on the laser
swap. In short, we have gotten ~210mW through |
|
|
11981
|
Mon Feb 8 15:36:37 2016 |
gautam | Update | Green Locking | Alternative mode-matching scheme | I looked in the optics cabinet to see what
lenses we have available, and re-ran the
mode-matching calculation to see if we could |
|
|
11980
|
Mon Feb 8 09:37:07 2016 |
Steve | Update | SUS | EQ 3.9m | No sign of damage
|
|
|
11979
|
Fri Feb 5 16:50:24 2016 |
gautam | Update | Green Locking | First pass at mode-matching | I've done a first pass at trying to
arrive at a mode-matching solution for the
X-end table once we swtich the lasers out. |
|
|
11978
|
Fri Feb 5 15:02:13 2016 |
gautam | Update | Green Locking | X-end NE cable | [Steve, gautam]
Steve thinks that the X-end Innolight
does not come with the noise-eater option |
|
|
11977
|
Fri Feb 5 00:23:01 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I've repeated the measurement for the
x-direction and also did the y-direction,
taking into account Koji's suggestion |
|
|
11976
|
Thu Feb 4 10:19:05 2016 |
Steve | Update | safety | fire marshal inspection | Pasadena fire marshal inspected the lab
today. No violation was found. |
|
|
11975
|
Thu Feb 4 10:14:52 2016 |
Steve | Update | SUS | earthquake 3.5M |
|
|
|
11974
|
Thu Feb 4 09:16:46 2016 |
Koji | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I don't think the discrepancy is a
serious issue as long as the mode is clean.
The mode is determined by the NPRO crystal |
|
|
11973
|
Wed Feb 3 23:23:47 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | As Koji pointed out in the previous elog,
the CCD beam profiler was ill suited for
this measurement. Nevertheless, to get a |
|
|
11972
|
Wed Feb 3 08:39:17 2016 |
Steve | Update | CDS | blank daily summary pages | Daily summary pages are blank today. Yesterday
is ok |
|
|
11971
|
Tue Feb 2 18:54:02 2016 |
Koji | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | jiIn fact, it is one of the most difficult
type mode profiling to measure a beam directly
out from a laser source. |
|
|
11970
|
Tue Feb 2 18:35:47 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I've moved the following components
that was a part of Koji's setup from
the PSL table to the SP table so that I may |
|
|
11969
|
Mon Feb 1 18:11:25 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | Before distrubing the beat setup with the
spare Lightwave laser, I wanted to see if
I could resolve the apparent difference in |
|
|
11968
|
Mon Feb 1 15:43:18 2016 |
Koji | Update | Green Locking | Innolight laser is 10 years old | This is the same one as what you got from
Steve. But you can find full pages.
https://wiki-40m.ligo.caltech.edu/PSL/NPRO |
|
|
11967
|
Mon Feb 1 15:16:28 2016 |
gautam | Update | Green Locking | Innolight laser is 10 years old | The Innolight laser control unit has a
25 pin D-sub connector on the rear which
is meant to serve as a diagnostics aid, and |
|
|
11966
|
Mon Feb 1 14:08:06 2016 |
Steve | Update | PEM | roof condtion is good | It rained hard yesterday. We have not had
this strong downpoor for years. We got |
|
|
11965
|
Mon Feb 1 09:16:32 2016 |
Steve | Update | PEM | Rat got cut | We got it! Traps are removed.
|
|
|
11964
|
Sat Jan 30 09:56:24 2016 |
Koji | Update | Green Locking | Innolight laser is 10 years old | It is strange that there is no difference
between with and without NE, isn't it? |
|
|
11963
|
Sat Jan 30 00:12:22 2016 |
gautam | Update | Green Locking | Innolight laser is 10 years old |
|
|
|
11962
|
Fri Jan 29 16:55:27 2016 |
rana | Update | Green Locking | Innolight laser is 10 years old | I don't think there's any evidence
that the noise eater is bad. That would change
the behavior of the relaxation oscillation |
|
|
11961
|
Fri Jan 29 14:43:47 2016 |
Steve | Update | Green Locking | Innolight laser is 10 years old |
|
|
|
11960
|
Fri Jan 29 09:59:23 2016 |
Steve | Update | VAC | vacuum control upgrade | Rana stated yesterday that there will be
a vacuum control update in the close future.
Witnesses : Rich, Chris and Dave |
|
|
11959
|
Fri Jan 29 08:18:13 2016 |
Steve | Update | PEM | PEM |
|
|
|
11958
|
Thu Jan 28 19:10:16 2016 |
gautam | Update | LSC | Status of the green PDH circuits |
|
|
|
11957
|
Thu Jan 28 14:54:49 2016 |
ericq | Update | LSC | Status of the green PDH circuits | Yesterday, I uploaded some EAGLE schematic
files and a LISO source file for the green
PDH servo electronics to the 40m LISO git |
|
|
11956
|
Thu Jan 28 00:29:30 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | Summary of the work done today:
Alignment and other work on
PSL table |
|
|
11955
|
Wed Jan 27 23:14:25 2016 |
gautam | Update | PEM | ETMX floor vs table noise |
|
|
|
11954
|
Wed Jan 27 20:51:00 2016 |
rana | Update | PEM | ETMX floor vs table noise | I didn't really appreciate this measurement
until just now. IF you can save the DTT .xml
file with all the traces in it (i.e. NOT |
|
|
11953
|
Wed Jan 27 18:19:45 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | After adjusting the alignment of the two
beams onto the PD, I managed to recover a
stronger beatnote of ~ -10dBm. I managed |
|
|
11952
|
Wed Jan 27 08:17:38 2016 |
Steve | Update | PEM | ETMX floor vs table noise |
|
6x |
|
11951
|
Tue Jan 26 17:50:22 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | I attempted to measure the frequency noise
of the extra Lightwave NPRO we have that
is currently sitting on the PSL table. I |
|
|
11950
|
Tue Jan 26 15:07:47 2016 |
Steve | Update | PEM | accelerometers moved to ETMX | Objective: measure the noise floor
on the optical table and the floor so we
can decide if the table needs better anchoring |
|
|
11949
|
Mon Jan 25 11:06:08 2016 |
Steve | Update | PEM | noisy fan belt replaced | The noisy fan belt on the roof of the control
room was finally replaced on Friday, Jan
22 2016 |
|
|
11948
|
Mon Jan 25 08:36:46 2016 |
Steve | Update | SUS | PRM damping restored | PRM suspension damping restored after 4.1
Mag Ludlow earthquake.
|
|