 Thu May 15 16:24:18 2008, josephb, Summary, Cameras,
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The GC750 camera is currently looking at a very small pickoff of the PSL output (transmission of a Y1-1037-45-S mirror). The plan is to take images tomorrow
with it and the GC650 from the same spot and do comparisons.
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Thu May 22 11:25:19 2008, josephb, Configuration, Computers,
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One of the new Netgear Prosafe 24 port switches was mounted in the 1X4 rack,, roughly in the middle, away from the top and bottom rack mounted electronics.
At the moment, its IP has been set to 131.215.113.250, gateway 131.215.113.2 (which is what I saw as the only listed gateway on linux1 using route -n)
and mask 255.255.255.0.
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Fri Jun 27 14:36:39 2008, John, Summary, Locking, 
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Rob, Yoichi, John
Some progress last night:
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Mon Jun 30 16:00:02 2008, josephb, sam, Configuration, Computers,
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Sam and I setup Cat6 cable from Megatron to the 1Y6 Switch (131.215.113.252) and also connected the 1Y6 Hub to the control room switch.
While I was at it, I checked the configurations of the two switchs now connected (one in 1X4 and one in 1Y6) to the martian network. For some reason, |
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Mon Aug 11 13:59:23 2008, josephb, Configuration, Computers,
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While poking around the crate, I noticed an error light on one of the c1susvme2 related boards was lit, while the corresponding light on the c1susvme1 was
not. This confuses me as the c1susvme1 is the one having problems.
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Thu Sep 25 14:03:08 2008, josephb, Configuration, Computers,
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[quote]
We (Joe) need to buy a GigE card for linux1 and to also set up conlog and conlogger to run on Nodus.
[/quote]
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Mon Jan 26 14:51:54 2009, josephb, Configuration, VAC,
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We need a new RS-232 to Ethernet bridge in order to interface properly with the new RGA. The RGA has a fixed baud rate of 28.8k, and the current bridge
(which used to work with the old RGA) doesn't have that baud rate as an option. Currently looking into purchasing a new bridge, and trying to make sure
it can meet the communications requirements of the RGA. |
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Wed Mar 11 11:30:15 2009, josephb, Configuration, Cameras,
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I modified the Video.db file used by c1aux located in /cvs/cds/caltech/target/c1aux.
I added the following channels to the db file, intended for either read in or read out by the digital camera scripts.
C1:VID-ETMY_X_COM |
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Thu Apr 22 15:44:34 2010, josephb, Update, Computers,
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I updated the default FILTER.adl file located in /home/controls/cds/advLigo/src/epics/util/ on megatron. I moved the yellow ! button up slightly,
and fixed the time string in the upper right. |
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Wed Jul 7 11:23:08 2010, Sharmila, Katharine, Update, WIKI-40M Update,
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Weekly Update:
Last Weds-Thurs, we wrote and edited our progress reports.
Tuesday (and Weds morning): Continued circuit analysis of Haixing's circuit and plotting transfer functions (almost have one for entire circuit). |
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Thu Jul 8 17:29:20 2010, Katharine, Sharmila, Update, elog, 6x
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Last night, we successfully connected and powered our circuit, which |
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Wed Jul 14 11:32:36 2010, Sharmila, Katharine, Update, WIKI-40M Update,
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Weekly update:
We correctly connected our circuit to power source to verify that it was functional and that our LED in the shadow sensor turned on. It did, |
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Wed Jul 28 13:06:47 2010, Razib, Update, Phase Camera,
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Attached are some calculation that I did previously for the phasecamera setup. This shows the nature of the beat signal that we are measuring.
I am also trying to characterize the noise source of the camera also. Following images shows the mean dark noise (with no light on the camera)
and the standard deviation for 100 snaps at an exposure time of 500 µs. |
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Wed Sep 15 16:00:26 2010, koji, steve, Update, MOPA,
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We removed the Lightwave MOPA Controller from 1X1 (south) It was a real painfully messy job to pull out the umbilical.
Note: the umbilical is shading it plastic cover. It is functional but it has to be taken out side and cleaned. Do not remove it from it's plastic
bag in a clean environment. |
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Thu Dec 9 01:14:42 2010, Osamu, Update, SUS,
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After Kiwamu had set the free swinging mode for ITMX and ETMX, I found a big jump of ITMX pitch and yaw. This jump is shown on oplev and OSEM plots.
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 Thu Dec 9 11:13:37 2010, Osamu, Update, SUS,
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Quote:
After Kiwamu had set the free swinging mode for ITMX and ETMX, I found a big jump of ITMX pitch and yaw. This jump |
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Sat Nov 26 07:22:20 2011, suresh, Update, Computers,
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| c1sus has been shutdown so that the optics dont bang around. This is because the watch dogs are not working. |
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Tue Jul 23 13:29:58 2013, Koji, Summary, General,
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| record of the initial state |
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Sun Apr 13 13:03:34 2014, rana, Update, LSC,
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That's a very smooth DARM transition - its good news that the dALS signals don't have a huge offset w.r.t the real error signal.
It would be interesting to see if the MICH can be locked and stay locked which CARM is ramped in. We would want to hold it with the Q phase of
the CARM PD once its on. |
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Fri Dec 1 17:09:29 2017, Udit Khandelwal, Summary, General,
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Current objectives and statuses:
CAD Model of 40m lab (facility, chambers, invacuum components etc)
Status: On hold since I'm unable to acquire general
dimensions of
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Thu Jun 7 20:19:53 2018, pooja, Update, ,
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| Just to inform, I'm working in optimus to develop python code to train the neural network since it requires a lot of memory. |
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Thu Jul 5 17:58:04 2018, keerthana, sandrine, Update, elog,
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(Analisa, Sandrine, Keerthana)
Today Annalisa helped us to understand the new set up used to make the frequency scans of the AUX laser. While tracking the cables it seemed
that there were quite a lot of cables near the mixer. So we have reconnected one of the splitter which was splitting the RF out put signal from the Agilent |
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Tue Jan 29 16:12:21 2019, Chub, Update, ,
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The foam in the cable tray wall passage had been falling on the floor in little bite-sized pieces, so I investigated and found a fiber cable that had
be chewed/clawed through. I didn't find any droppings anywhere in the 40m, but I decided to bait an un-set trap and see if we'd find activity
around it. There has been none so far. If there is still none tomorrow, I will move the trap and keep looking for signs of rodentia. At the |
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Mon Apr 1 12:01:52 2019, Jon, Update, CDS,
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I brought c1susaux back online this morning for suspension-channel test scripting. It had been dead for some time. I followed the procedure outlined
in #12542. ITMY became stuck during this process, which Gautam tells me always happens since
the last vacuum access, but ITMX is not stuck. |
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Fri Aug 2 17:07:33 2019, yehonathan, gautam, Update, Loss Measurement,
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| We run a loss measurement on the Y arm with 50 repetitions. |
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Mon Aug 5 14:47:36 2019, yehonathan, Update, Loss Measurement,
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Summary:
I analyze the 100 reps loss measurement of the Y arm using the AnalyzeLossData.ipynb notebook.
The mean of the measured loss is ~ 100ppm and the variation between the repititions is ~ 27%. |
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Mon Aug 5 17:36:04 2019, yehonathan, Update, Loss Measurement,
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We check for unexpected drifts in the PD reading (clipping and such). We put a pickoff mirror where the PD used to be and place the PD at the edge of
the table such that the beam is focused on it (see attachment).
The arms are completley misaligned. We note the time of start of measurement to be 1249086917. |
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Tue Aug 6 16:44:50 2019, yehonathan, Update, Loss Measurement,
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I grab 2 hours of the PD measurements using dlData_simple.ipynb in the misaligned state.
I get pretty much a normally distributed reading without drifts (Attachements 1 and 2).
The error in the reading is ~ 0.5%. |
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Tue Feb 25 16:17:57 2020, Gautam, Hang, Update, CDS,
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| Seems that the GPS is out of sync on donatella. We could not get any data from diaggui... |
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Tue Mar 10 14:30:16 2020, yehonathan, Update, SUS,
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ETMX was grossly misaligned.
I re-aligned it and the X arm now locks.
7:00PM with Koji |
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Tue Mar 10 19:58:16 2020, yehonathan, Update, SUS,
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I returned the triggering threshold to normal values (5/3).
Meanwhile,
i want to block the Y arm trans PD (Thorlabs). To do it, the PD<->QPD thresholds were changed from 5.0/3.0 to 0.5/0.3. |
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Mon Mar 15 08:55:45 2021, Paco, Anchal, Summary, training,
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[Paco, Anchal]
Found IMC locked upon arrival.
Since "allegra" was set up as an additional workstation, we tried using it but discovered
the monitor ist kaput. For the sake of debugging, we tested VGA and DVI inputs and even the monitor lying around (also labeled "allegra") |
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Wed Apr 15 11:25:21 2009, steve, Configuration, VAC, RGA cal completed
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Quote:
Vacuum normal valve condition was changed to accommodate SRS-RGA calibration. |
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Thu Jun 14 15:24:32 2018, Steve, Update, PEM, ADC DAC In Line Test Boards are in
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We have 6 of these boards now in cabinet E7
Quote:
I wired all 32 channels going to the AA board directly to the ADC as described in the previous |
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Tue Feb 7 16:30:46 2012, steve, Update, SUS, ALL oplev PIT transfer functions 7x
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SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude:
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Thu Feb 9 16:46:02 2012, steve, Update, SUS, ALL oplev YAW transfer functions 7x
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Quote:
SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude: |
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Tue Apr 24 15:59:23 2018, Steve, Update, Wiki, AP table layout 20180328
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Quote:
ETMX table layout uploaded with beam paths to the wiki.
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Tue Aug 21 09:16:23 2018, Steve, Update, Wiki, AP table layout 20180821
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Tue Jun 9 10:57:12 2015, Steve, Update, SUS, BS oplev laser tuned
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Lenses removed from oplev beam path at elog entry 11246
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Tue Oct 27 10:08:12 2015, Steve, Update, VAC, CC vacuum gauges
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CC1 and CC2 are working again. Why did they start working again ?
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Mon Mar 10 21:13:43 2014, nicolas, Summary, LSC, Composite Error Signal for ARms (2)
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In order to better understand how the composite signal would behave in the presence of noise, I decided to do a simple analysis of the cavity signals
while sweeping through resonance.
My noise model was to just assume that a given signal has some rms uncertainty (error bars) and use linear error propagation to propagate from |
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Tue May 5 11:44:33 2009, rob, Update, Locking, DARM response
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Here's the RF DARM optical response, on the anti-spring side, from optickle. Note that for the f1 sideband, changing the demod phase mostly adjusts the
overall gain, while for the f2 sideband a change in demod phase alters the shape of the response. This is the quadrature-selecting power of using a single |
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Fri Jun 10 09:52:51 2016, Steve, Update, SUS, EQ 5.2 mag Borego Spring
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EQ 5.2 mag at Jun 10, 8:04 am UTC, Borego Spring, CA ~150 mi away.........no obvoius damage, damping restored, MC is locking, arms are flashing
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Mon Jun 20 09:36:10 2016, Steve, Update, SUS, EQ 3.1 m Big Bear Lake, CA
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No suspention lost damping.
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Mon Feb 8 09:37:07 2016, Steve, Update, SUS, EQ 3.9m
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No sign of damage
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Wed Jun 29 16:02:29 2016, Steve, Update, SUS, ETMX beam baffle
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In the attached photo from 2012, one can see the installed black glass baffle. According to the drawings (LIGO-DNNNXXX) this one has a clear aperture
of 40 mm.
In (someplace ?) we have clean baffles with a 50 mm aperture which can be installed during this vent. In order to be more conservative, let us |
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Fri Mar 17 10:47:16 2017, Steve, Update, Optical Levers, ETMX oplev laser replaced
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JDSU 1103P. sn T8070866, made March 2007, output power 2.7 mW, on pd 17,750 counts,
GV 17 March 3pm: I found the Innolight NPRO was off when I walked down to the X end earlier,
possibly was accidentally tripped during the Oplev laser replacement. I turned it back on. |
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Tue Jun 28 09:14:27 2016, Steve, Update, SUS, ETMX optics preparation to be rehanged
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Given the effect on the contrast defect, the consensus at the meeting Wednesday 6-22 was that we should continue to use the existing ETMX optic.
Does this imply that we can simply:
Vent
Remove the current ETMX suspension, and
optic from the suspension
Replace the standoffs (and guide rod if necessary), leaving the current magnets in place
Re-suspend |
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Fri Apr 20 16:25:08 2018, Steve, Update, Wiki, ETMX table layout uploaded to wiki
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| ETMX table layout uploaded with beam paths to the wiki. |
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Thu Apr 4 17:23:05 2013, Steve, Update, 40m Upgrading, ETMY optical table & enclosure is ready for optics
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Quote:
Enclosure is at the east end. It has it's bottom o-ring in place. It will be ready for optics tomorrow around 5pm |