 Tue Feb 5 03:16:51 2013, Koji, Summary, General, rough analysis of aligned PRM-PR2 mode scan
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0.764 and 0.751 do not give us the stdev of 0.005.
I have never seen any Yokogawa in vicinity.
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Tue Feb 5 10:09:08 2013, yuta, Summary, General, rough analysis of aligned PRM-PR2 mode scan
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stdev of [0.764, 0.751] is 0.007, but what we need is the error of the averaged number. Statistical error of the averaged number is stdev/sqrt(n).
Quote:
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Tue Feb 5 11:30:19 2013, Koji, Summary, General, rough analysis of aligned PRM-PR2 mode scan
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Makes sense. I mixed up n and n-1
Probability function: X = (x1 + x2 + ... + xn)/n, where xi = xavg +/- dx
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Wed Feb 13 01:26:08 2013, yuta, Summary, General, rough analysis of aligned PRM-PR2 mode scan 
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Koji was correct.
When you estimate the variance of the population, you have to use unbiased variance (not sample |
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Mon Dec 7 11:11:25 2015, yutaro, Summary, LSC, round trip loss of X arm
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On the day before yesterday and in this morning, I measured loss map of ETMX. I reported the method I used to change the beam spot on ETMX below.
Round trip loss was measured for 5 x 5 points. The result is below.
(unit: ppm) |
 Wed Nov 25 16:40:32 2015, yutaro, Update, LSC, round trip loss of Y arm
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I measured round trip loss of Y arm. The alignment of relevant mirrors was set ideal with dithering (no offset).
Summary:
round trip loss of Y arm: 166.2 +/- 9.3 ppm |
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Wed Nov 25 23:34:52 2015, yutaro, Update, LSC, round trip loss of Y arm
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[yutaro, Koji]
Due to the strange behavior (elog 11815) of ASDC level, we checked if it is possible
to use POYDC instead of ASDC to measure the power of reflected light of YARM. Attached below is the spectrum of them when the arm is locked. This spectrum |
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Fri Nov 27 03:38:23 2015, yutaro, Summary, LSC, round trip loss of Y arm
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Tonight I measured "loss map" of ETMY. The method to calculate round trip loss is same as written in elog
11810, except that I used POYDC instead of ASDC this time.
How I changed beam spot on ETMY is: elog 11779. |
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Fri Nov 27 22:20:24 2015, yutaro, Update, LSC, round trip loss of Y arm
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Here, I upload data I took last night, including the power of reflected power (locked/misaligned) and transmitted power for each point (attachement 1).
And I would like to write about possible reason why the loss I measured with POYDC and the loss I measured with ASDC are different |
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Thu Mar 13 12:11:58 2008, aivanov, Update, Computer Scripts / Programs, routing PEM -> ASS -> SUS_MCL
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on ASS RFM 1 has PEM signals at
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Fri Mar 14 15:06:24 2008, rob, Update, Computer Scripts / Programs, routing PEM -> ASS -> SUS_MCL
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[quote]
on ASS RFM 1 has PEM signals at
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Mon Mar 23 19:30:36 2015, rana, Update, Computer Scripts / Programs, rsync frames to LDAS cluster
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The rsync job to sync our frames over to the cluster has been on a 20 MB/s BW limit for awhile now.
Dan Kozak has now set up a cronjob to do this at 10 min after the hour, every hour. Let's see how this goes.
You can find the script and its logfile name by doing 'crontab -l' on nodus. |
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Wed May 13 09:17:28 2015, rana, Update, Computer Scripts / Programs, rsync frames to LDAS cluster
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Still seems to be running without causing FB issues. One thought is that we could look through the FB status channel trends and see if there is some
excess of FB problems at 10 min after the hour to see if its causing problems.
I also looked into our minute trend situation. Looks like the files are comrpessed and have checksum enabled. The size changes sometimes, but |
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Mon May 18 14:22:05 2015, ericq, Update, Computer Scripts / Programs, rsync frames to LDAS cluster
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Quote:
Still seems to be running
without causing FB issues. |
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Thu Feb 3 17:25:03 2011, josephb, Update, Computers, rsync script was not really backing up /cvs/cds
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So today, after an "rm" error while working with the autoburt.pl script and burt restores in general, I asked
Dan Kozak how to actually look at the backup data. He said there's no way to actually look at it at the moment. You can reverse the rsync command
or ask him to grab the data/file if you know what you want. However, in the course of this, we realized |
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Tue Jun 12 17:46:09 2012, Jenne, Update, Computers, rtcds: command found
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Quote:
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Tue Jun 12 00:15:51 2012, Jenne, Update, Computers, rtcds: command not found
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We can't compile any changes to the LSC or the GCV models since Jamie's new script / program isn't found. I don't know where it is (I can't find
it either), so I can't do the compiling by hand, or point explicitly to the script. The old way of compiling models in the wiki is obsolete, and
didn't work :( |
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Tue Jun 12 11:25:05 2012, Jamie, Update, Computers, rtcds: command not found
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Quote:
We can't compile any changes to the LSC or the GCV models since Jamie's new script / program isn't found. I don't know where it is |
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Fri Feb 10 15:46:59 2012, steve, Update, SUS, ruby wire standoff
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Finally I found a company who can do Koji's improved -hard to make- specification on ruby or sapphire wire standoff.
NOT POLISHED excimer laser cut, wire groove radius R 0.0005" + - 0.0002" |
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Mon Jun 5 10:30:45 2017, Steve, Update, SUS, ruby wire standoff pictures
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Atm 1 & 5, showing the ruby R ~10 mm as it is seated on Al SOS test mass
Atm. 2, 3 & 4 chipped long edges with SOS sus wire OD 43 micron as calibration
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Mon Jul 17 16:22:01 2017, Steve, Update, SUS, ruby wire standoff pictures
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Bluebean Optical Tech Limited of Shanghai delivered 50 pieces red ruby prisms with radius. The first prism pictures were taken at
June 5 |
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Sun May 15 19:48:08 2016, Steve, Update, VAC, run out of N2
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3-4 hrs ago we run out of nitrogen. We are back to Vacuum Normal
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Thu May 31 15:48:16 2018, Kira, Update, PEM, running PID script with seismometer
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I have attached the result of running the PID script on the seismometer with the can on. The daily fluctuations are no more than 0.07 degrees off from
the setpoint of 39 degrees. Not really sure what happened in the past day to cause the strange behavior. It seems to have returned back to normal today. |
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Mon Jan 28 15:11:38 2008, rob, HowTo, DMF, running compiled matlab DMF tools
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I compiled Rana's seisBLRMS monitor, and it's now running on mafalda. To start your own DMF tools, here is a procedure:
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Mon Jun 18 10:34:45 2018, johannes, Update, Computer Scripts / Programs, running comsol job on optimus
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| I'm running a comsol job on optimus in a tmux session named cryocavs. Should be done in less than 24 hours, judging by past durations. |
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Tue Jul 14 13:55:28 2015, jamie, Update, CDS, running test on daqd, please leave undisturbed
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I'm running a test with daqd right now, so please do not disturb for the moment.
I'm temporarily writing frames into a tempfs, which
is a filesystem that exists purely in memory. There should be ZERO IO contention for this filesystem, so if the daqd failures are due to IO then
all problems should disappear. If they don't, then we're dealing with some other problem. |
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Tue Jul 14 17:06:00 2015, jamie, Update, CDS, running test on daqd, please leave undisturbed
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| I have reverted daqd to the previous configuration, so that it's writing frames to disk. It's still showing instability. |
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Sun Jan 15 12:18:00 2012, Den, Update, Adaptive Filtering, running time
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In order to figure out what downsampling ratio we can take, we need to determine the running time of the fxlms_filter() function. If the filter
length is equal to 5000, downsampling ratio is equal to 1, number of witness channels is 1 then with ordinary compilation without speed optimization one
call runs for 0.054 ms (milli seconds). The test was done on the 3 GHz Intel processor. With speed optimization flags the situation is better |
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Wed Nov 9 11:40:44 2016, ericq, Update, CDS, safe.snap BURT files now in svn
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This is long overdue, but our burt files for SDF now live in the LIGO userapps SVN, as they should.
The canonical files live in places like /opt/rtcds/userapps/release/cds/c1/burtfiles/c1x01_safe.snap
and are symlinked to files like /opt/rtcds/caltech/c1/target/c1x01/c1x01epics/burt/safe.snap |
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Mon Mar 1 08:49:37 2010, steve, Bureaucracy, SAFETY, safety audit
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The 40m safety audit will be at Wednesday afternoon, March 3
Please participate getting our lab to inspection grade safety level. |
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Tue Feb 28 11:20:51 2012, steve, Update, SAFETY, safety audit 2012
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Correction list by visiting safety committee, Haick Issaian is not shown:
1, update laser, crane operator list and post it
2, check fire extinguishers monthly, date and initials must be on the tags |
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Fri Mar 30 09:37:13 2012, steve, Update, SAFETY, safety audit 2012 CORRECTIONS
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Quote:
Correction list by visiting safety committee, Haick Issaian is not shown: |
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Wed Mar 6 11:33:09 2013, steve, Update, SAFETY, safety audit 2013
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Recommended correction list: |
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Tue Feb 25 16:54:57 2014, steve, Update, safety, safety audit 2014
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We had our annual safety inspection today. Our SOPs are outdated. The full list of needed
correction will be posted tomorrow. |
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Thu Mar 13 16:05:48 2014, steve, Update, safety, safety audit 2014
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Quote:
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Mon Apr 28 17:27:29 2014, steve, Update, safety, safety audit 2014
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Quote:
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Tue Apr 29 00:11:03 2014, steve, Update, safety, safety audit 2014
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Be aware that this may affect POP QPD and POP RF Thorlabs PD
Quote:
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Fri May 2 08:15:54 2014, steve, Update, safety, safety audit 2014
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Late adition: CHECK all viewport covers.
A, transparent Lexan sheet is protecting glass windows in a horizontal position |
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Wed Feb 25 14:35:32 2015, Steve, Update, safety, safety audit 2015
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Safety audit went soothly. We thank all participients.
Correction list:
1, Bathroom water heater cable to be stress releived and connector replaced by twister lock type. |
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Fri Feb 27 14:17:51 2015, Steve, Update, safety, safety audit 2015
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Safety glasses were measured and they are all good. I'd like to measure your personal glass if it is not on this picture.
Quote:
Safety audit went soothly. |
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Wed Feb 24 10:27:23 2016, Steve, Update, safety, safety audit 2016
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Safety audit went smothly.
Crane inspection is scheduled for March 4
Safety glasses will be measured before April 1 |
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Thu Mar 3 10:19:20 2016, Steve, Update, safety, safety audit 2016
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Bob cleaned the safety glasses. They were sonicated in warm 2% Liquinox water for 10 minutes. Steve checked them by transmission measurement
of 1064 nm at 150 mW
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Thu Feb 27 13:11:13 2014, steve, Update, safety, safety audit correction
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Quote:
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Mon Feb 27 10:21:37 2012, steve, Update, SAFETY, safety audit tomorrow morning
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Quote:
Emergency exit lights were inspected: 2 out of 13 batteries have to be replaced |
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Thu Feb 23 09:09:33 2012, steve, Update, SAFETY, safety checks
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Emergency exit lights were inspected: 2 out of 13 batteries have to be replaced
One of the Halon fire extinguishers needs to be recharged out of 8
Please do participate in preparation for the upcoming safety audit on Feb 28 |
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Tue May 31 11:34:13 2011, steve, Summary, SAFETY, safety glasses checked
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| 1064 nm transmison were measured of 40m safety glasses as shown . Their performance did not degrade. They are as good as their labels. |
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Fri Mar 26 10:48:35 2010, steve, Update, SAFETY, safety glasses measured
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| Safety glasses 1064 nm transmission measured at ~200 mW level. They are all good. |
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Tue Jul 15 11:04:05 2014, Steve, Update, safety, safety glasses must be worn all times!
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This is the third safety glasses that I found laying around in the IFO lab lately. Safety glasses must be worn ALL
times in the IFO room!
This rule is essential for your protection! Please do not enter if you can not put up with this regulation! |
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Fri Aug 15 14:12:31 2008, steve, Bureaucracy, SAFETY, safety glasses required
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The MOPA shutter is opened,
the PSL enclosure is switched to bypass mode,
manual block removed from PMC,
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Thu Aug 21 16:28:59 2008, steve, Configuration, SAFETY, safety glasses required
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I just opened the MOPA shutter so PA is warming up.
High power beam path is cleared and laser safety glasses required. |