 Wed May 3 16:46:18 2017, Koji, Configuration, Computers, catastrophic multiple monitor failures
|
- Is there any machine that can handle 4K? I have one 4K LCD for no use.
- I also can donate one 24" Dell |
|
Thu May 4 09:52:43 2017, rana, Configuration, Computers, catastrophic multiple monitor failures
|
That's a new failure mode. Probably we can't trust the power to be safe anymore.
Need Steve to order a couple of surge suppressing power strips for the monitors. The computers are already on the UPS,
so they don't need it. |
Tue May 9 15:23:12 2017, Steve, Configuration, Computers, catastrophic multiple monitor failures 
|
Gautam and Steve,
Surge protective power strip
was install on Friday, May 5 in the Control Room |
|
Mon May 15 20:43:25 2017, rana, Configuration, Computers, catastrophic multiple monitor failures
|
this is not the right one; this Ethernet controlled strip we want in the racks for remote control.
Buy some
of these for the MONITORS. |
 Tue May 23 18:09:18 2017, Kaustubh, Configuration, General, Testing ET-3010 PD
|
In continuation with the previous(ET-3040 PD) test.
The ET-3010 PD requires to be fiber coupled for optimal use. I will try to test this model without the fiber couple tomorrow and see whether
it works or not. |
|
Fri Jun 16 18:21:40 2017, jigyasa, Configuration, Cameras, GigE camera IP
|
One of the additional GigE cameras has been IP configured for use and installation.
Static IP assigned to the camera- 192.168.113.152
Subnet mask- 255.255.255.0 |
|
Wed Aug 2 15:04:15 2017, gautam, Configuration, Computers, control room workstation power distribution
|
The 4 control room workstation CPUs (Rossa, Pianosa, Donatella and Allegra) are now connected to the UPS.
The 5 monitors are connected to the recently acquired surge-protecting power strips.
Rack-mountable power strip + spare APC Surge Arrest power strip have been stored in the electronics cabinet. |
|
Tue Nov 21 17:51:01 2017, Koji, Configuration, Computers, nodus post OS migration admin
|
The post OS migration admin for nodusa bout apache, elogd, svn, iptables, etc can be found in https://wiki-40m.ligo.caltech.edu/NodusUpgradeNov2017
Update: The svn dump from the old svn was done, and it was imported to the new svn repository structure. Now the svn command line and (simple)
web interface is running. And "websvn" was also implemented. |
|
Tue Nov 21 23:47:51 2017, gautam, Configuration, Computers, nodus post OS migration admin
|
I restored the nodus crontab (copied over from the Nov 17 backup of the same at /opt/rtcds/caltech/c1/scripts/crontab/crontab_nodus.20171117080001. There
wasn't a crontab, so I made one using sudo crontab -e.
This crontab is supposed to execute some backup scripts, send pizza emails, check chiara disk usage, and backup the crontab itself. |
|
Wed Nov 22 11:51:38 2017, gautam, Configuration, Computers, nodus post OS migration admin
|
Confirmed that this crontab is running - the daily backup of the crontab seems to have successfully executed, and there is now a file crontab_nodus.ligo.caltech.edu.20171122080001
in the directory quoted below. The $HOSTNAME |
|
Sun Dec 3 05:25:59 2017, gautam, Configuration, Computers, sendmail installed on nodus
|
Pizza mail didn't go out last weekend - looking at logfile, it seems like the "sendmail" service was missing. I installed sendmail following
the instructions here: https://tecadmin.net/install-sendmail-server-on-centos-rhel-server/
Except that to start the sendmail service, I used systemctl and not init.d. i.e. I ran |
|
Sun Dec 3 17:01:08 2017, Koji, Configuration, Computers, sendmail installed on nodus
|
An email has come at 5PM on Dec 3rd.
|
|
Fri Jan 5 17:50:47 2018, rana, Configuration, Computers, motif on nodus
|
| I had to do 'sudo yum install motif' on nodus so that we could get libXm.so.4 so that we could run MEDM. Works now. |
|
Fri Jan 5 19:19:25 2018, rana, Configuration, SEI, Barry Controls 'air puck' instead of 'VOPO style' breadboard
|
We've been thinking about putting in a blade spring / wire based aluminum breadboard on top of the ETM & ITM stacks to get an extra factor of
10 in seismic attenuation.
Today Koji and I wondered about whether we could instead put something on the outside of the chambers. We have frozen the STACIS system because |
|
Wed Jan 10 14:17:57 2018, johannes, Configuration, Computer Scripts / Programs, autoburt no longer making backups
|
I was looking into setting up autoburt for the new c1auxex2 and found that it stopped making automatic backups for all machines after the beginning of
the new year. There is no 2018 folder (it
was the only one missing) in /opt/rtcds/caltech/c1/burt/autoburt/snapshots and the /latest/ |
|
Wed Jan 10 15:25:43 2018, johannes, Configuration, Computer Scripts / Programs, autoburt making backups again
|
Quote:
I manually created the /opt/rtcds/caltech/c1/burt/autoburt/snapshots/2018/ directory. Maybe this
fixes the hickup? Gotta wait about 30 minutes. |
|
Wed Jan 10 16:27:02 2018, Steve, Configuration, SEI, load cell for weight measurement
|
We could use similar load cells to make the actual weight measurement
on the Stacis legs. This seems practical in our case.
I have had bad experience with pneumatic Barry isolators. |
|
Fri Jan 12 12:31:04 2018, gautam, Configuration, Computers, sendmail troubles on nodus
|
I'm having trouble getting the sendmail service going on nodus since the Christmas day power failure - for some reason, it seems
like the mail server that sendmail uses to send out emails on nodus (mx1.caltech.iphmx.com,
IP=68.232.148.132) is on a |
|
Fri Jan 12 16:01:27 2018, Koji, Configuration, Computers, sendmail troubles on nodus
|
I personally don't like the idea of having sendmail (or something similar like postfix) on a personal server as it requires a lot of maintenance
cost (like security update, configuration, etc). If we can use external mail service (like gmail) via gmail API on python, that would easy our worry, I
thought. |
|
Fri Jan 12 18:22:09 2018, gautam, Configuration, Computers, sendmail troubles on nodus
|
Okay I will port awade's python mailer stuff for this purpose.
gautam 14Jan2018 1730: Python mailer has been implemented: see here for the files. On shared |
|
Sat Jan 13 02:36:51 2018, rana, Configuration, Computers, sendmail troubles on nodus
|
| I think sendmail is required on nodus since that's how the dokuwiki works. That's why the dokuwiki was trying to send an email to Umakant. |
|
Sat Jan 13 03:20:55 2018, Koji, Configuration, Computers, sendmail troubles on nodus
|
| I know it, and I don't like it. DokuWiki seems to allow us to use an external server for notification emails. That would be the way to go. |
|
Wed Jan 17 23:36:12 2018, johannes, Configuration, General, AS port laser injection
|
Status of the AS-port auxiliary laser injection
Auxiliary laser with AOM setup exists, first order diffracted beam is coupled into fiber that leads to the AS table.
There
is a post-PMC picked-off beam available that is currently just dumped (see picture). I want to use it for a beat note with the auxiliary laser pre-AOM |
|
Tue Jan 23 16:02:05 2018, Steve, Configuration, SEI, load cells
|
1500 and 2000 lbs load cells arrived from MIT to measure the vertical loads on each leg.
Quote:
We've been thinking about putting in a blade spring / wire based aluminum breadboard on top of the ETM & |
|
Tue Mar 13 20:03:16 2018, johannes, Configuration, Computers, c1auxex replacement
|
I assembled the rack-mount server that will long-term replace c1auxex, so we can return the borrowed unit to Larry.
SUPERMICRO SYS-5017A-EP Specs:
Intel Atom N2800 (2 cores, 1.8GHz, 1MB, 64-bit)
4GB (2x2GB) DDR3 RAM
128 GB SSD
|
|
Wed Mar 14 23:58:30 2018, johannes, Configuration, Computers, c1auxex replacement
|
I replaced the borrowed server with the permanent one today. Before Removing the current server, Before, I performed several additional preparations:
Updated Chiara hostables to IP 192.168.113.48 for c1auxex
apt-get install procserv
copied
ETMXaux2.* files in /cvs/cds/caltech/target/c1auxex2 to ETMXaux.* and changed references from /opt/rtcds/epics |
|
Mon Mar 19 14:39:09 2018, johannes, Configuration, Computers, c1auxex replacement
|
[gautam, johannes]
The temperature control output channel for the XEND seismometer wasn't working properly. The EPICS channel existed, could be written to and
read from, but no physical voltage was observed on the (confirmed properly) wired connector. |
|
Mon Apr 9 23:28:49 2018, johannes, Configuration, DAQ, c1psl channel list
|
I made a list of all the physical c1psl channels to get a better idea for how many acromags we need to replace it eventually. There 3123 unit is the one whose failure had prevented c1psl from booting, which is why it was unplugged (elog
post 12852), and its channels have been inactive since. Are the 126MOPA channels used for the current mephisto? 126 tells me it's for an old lightwave |
|
Wed Apr 18 17:15:35 2018, rana, Configuration, Computers, NODUS: no xmgrace for dataviewer
|
Turns out, there is no RPM for XmGrace on Scientific Linux 7. Since this
is the graphic output of dataviewer, we can't use dataviewer through X windows until this gets fixed. CDS is looking into a xmGrace replacement, but
it would be better if we can hijack a alt RH repo to steal a temporary xmgrace RPM. KT has been pinged. |
|
Wed Apr 18 22:46:23 2018, johannes, Configuration, General, AS port laser injection
|
Using Gautam's Finesse file and the cad files for the 40m optical setup I propagated the arm mode out of the AS port. For the location of the 3.04
mm waist I used the average distance to the ITMs, which is 11.321 m from the beam spot on the 2 inch mirror on the AS table close to the viewport. The
2inch lens focuses the IFO mode to a 82.6 μm waist at a distance of 81 cm, which is what we have to match the aux laser fiber output to. |
|
Thu Apr 19 01:04:00 2018, gautam, Configuration, General, AS port laser injection
|
For the arm cavity ringdowns, I guess we don't need AS55/AS110 (although I think the camera will still be useful for alignment). But for something
like RC Gouy phase characterization, I'd imagine we need the AS detectors to lock various cavities. So I think we should go for a solution that doesn't
disturb the AS PD beams. |
|
Thu Apr 19 20:41:09 2018, Koji, Configuration, General, Aux Laser LD dying? (AS port laser injection)
|
I suspect that the LD of the aux laser is dying.
- The max power we obtain from this laser (700mW NPRO) is 33mW. Yes, 33mW. (See attachment 1)
- The intensity noise is likely to be relaxation oscillation and the frequency is so low as the pump power is low. When the ADJ is adjusted to 0, |
|
Tue Apr 24 08:36:47 2018, johannes, Configuration, General, Aux Laser LD dying? (AS port laser injection)
|
In September 2017 I measured ~150mW output power, which was already kind of low. What are
the chances of getting this one repaired? Steve, can you please check the serial number? It's probably too old like the other ones.
Quote:
|
|
Tue Apr 24 11:31:59 2018, gautam, Configuration, ALS, Proposed changes to EX fiber coupling
|
Motivation: I want to make another
measurement of the out-of-loop ALS beat noise, with improved MM into both the PSL and EX fibers and also better polarization control. For this, I
want to make a few changes at the EX table. |
|
Tue Apr 24 18:54:15 2018, gautam, Configuration, ALS, Proposed changes to EX fiber coupling
|
I started working on the EX table. Work is ongoing so I will finish this up later in the evening, but in case anyone is wondering why there is no green
light...
EX laser shutter was closed.
Disconnected EX input to the beat mouth at the PSL table in order to avoid accidentally frying |
|
Wed Apr 25 19:09:37 2018, gautam, Configuration, ALS, New look EX Fiber coupling
|
Summary:
I implemented most of the things outlined in my previous elog. Implementing the a la mode solution after
including all lenses, I managed to achieve >90% mode-matching into the fiber. Power monitor PD has not been re-installed yet, |
|
Thu Apr 26 11:24:50 2018, gautam, Configuration, ALS, New look EX Fiber coupling - pol stability
|
Here is a first look at the overnight stability. For the temperature, I used the calibration I found in the old psl database file, seems to give sensible
results. It's only 15 hours of data plotted, so we don't see the full 24 hour temperature swing, but I think it is safe to say that for the EX
fiber, the dominant cause of the "waveplate effect" is not in fact temperature drift. The polarization extinction is still better than 10dB in |
|
Thu Apr 26 18:58:21 2018, Bruce, Configuration, ALS, New look EX Fiber coupling - pol stability
|
| |
|
Fri Apr 27 01:36:02 2018, gautam, Configuration, ALS, IR ALS noise performance
|
Summary:
My goal was to do some further characterization of the IR ALS system tonight. With POX as an OOL sensor, I measured an RMS
displacement noise of 8 pm with the |
|
Tue May 1 08:04:13 2018, Jon Richardson, Configuration, Electronics, PSL-Aux. Laser Phase-Locked Loop
|
[Jon, Gautam, Johannes]
Summary: In support of making a proof-of-concept RF measurement of the SRC Gouy phase, we've implemented a PLL of the
aux. 700mW NPRO laser frequency to the PSL. The lock was demonstrated to hold for minutes time scales, at which point the slow (currently uncontrolled) |
|
Wed May 2 21:39:33 2018, gautam, Configuration, ALS, IR ALS for EY
|
The new K6XS mounts I ordered have arrived. I want to install one of them at the Y-end. I can't find a picture of the current
layout but it exists as there is a hardcopy affixed to the ETMY chamber door, Steve, can we dig this up and put it in the wiki? In any case, the current |
|
Thu May 3 10:40:43 2018, johannes, Configuration, General, AS port laser injection
|
Instead of trying to couple the fiber output into the interferometer, I'm doing the reverse and maximize the amount of interferometer light going
into the fiber. I set up the mode-matching solution shown in attachment #1 and started tweaking the lens positions. Attachment #2 shows the setup on the
AS table. After the initial placement I kept moving the lenses in the green arrow directions and got more and more light into the fiber. |
|
Thu May 3 12:10:12 2018, gautam, Configuration, General, AS port laser injection
|
I think we need AS55 for locking the configuration Jon suggested - AS55 I and Q were used to lock the SRMI previously, and so I'd like to start from
those settings but perhaps there is a way to do this with AS110 I and Q as well.
Quote:
|
|
Thu May 3 20:29:39 2018, gautam, Configuration, Electronics, PSL-Aux. Laser Phase-Locked Loop
|
Some notes about the setup and work at the PSL table today, Jon can add to / correct me.
All equipment for the phase locking now sit on a cart that is on the west side of the MC beam tube, near ITMX chamber.
Cables
have been routed through the space between the PSL enclosure and the optical table.
HEPA was turned up for this work, now it has been turned |
|
Fri May 4 13:24:56 2018, Jon Richardson, Configuration, Electronics, AUX-PSL PLL Implementation & Characterization
|
Attached are final details of the phase-locked loop (PLL) implementation we'll use for slaving the AUX 700 mW NPRO laser to the PSL.
The first image is a schematic of the electronics used to create the analog loop. They are curently housed on an analyzer cart beside the
PSL table. If this setup is made permanent, we will move them to a location inside the PSL table enclosure. |
|
Fri May 4 19:06:28 2018, rana, Configuration, Electronics, AUX-PSL PLL Implementation & Characterization
|
this doesn't make much sense to me; the phase to frequency conversion (mixer-demod to PZT ) should give us a 1/f loop as Johannes mentioned in the
meeting. That doesn't agree with your loop shape.
How about give us some more details of the setup including photos and signal/power levels? And maybe measure the LB1005 TF by itself to find |
|
Fri May 4 21:17:57 2018, gautam, Configuration, ALS, BeathMouth pulled out of PSL table
|
I have been puzzled about the beat note level we get out of the BeatMouth for some time.
The beat PD used is the Menlo FPD310.
But the version we have is an obsolete version of the product, for which a manual is
hard to find.
Hence, I don't know the transimpedance/electrical characteristics of this PD.
The optical |
|
Tue May 8 00:40:51 2018, gautam, Configuration, ALS, BeathMouth pulled out of PSL table
|
Summary:
I did some more BeatMouth characterization. My primary objective was to do a power budget. Specifically, to measure the insertion loss of the
mating sleeves and of the fiber beam splitters. All power numbers quoted in this elog are measured with the fiber power |
|
Tue May 15 20:51:27 2018, gautam, Configuration, Electronics, Making PLL setup more permanent
|
[jon, steve, gautam]
Some points which Jon will elaborate upon (and put photos of)
in his detailed elog about this setup: |
|
Wed May 16 18:52:50 2018, gautam, Configuration, Electronics, PLL mysteries solved
|
[Koji, Gautam]
Summary:
As I suspected, when |