 Mon Oct 26 15:40:01 2009, steve, Update, PSL, laser power is down 
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| The laser power is down 5-6% |
 Mon Oct 26 23:14:08 2009, Koji, Update, PSL, laser power is down
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I adjusted the steerings to the PMC and gained 7%. Now the MC_TRANS 7.0 has been recovered.
Actually I need another 7% to get MC_TRANS 7.5.
But I couldn't find how I can recover 126MOPA-AMPMON to 2.8ish. |
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Tue Oct 27 01:45:02 2009, rob, Update, Locking, MZ
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[quote] Tonight we also encountered a large peak in the frequency noise around 485 Hz. Changing the MZ lock point (the spot in the PZT range) solved this.[/quote]
This again tonight.
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Tue Oct 27 15:55:04 2009, Koji, Update, General, ISS injection work / HEPA is on
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I was working on the ISS excitation to take TFs.
I used ISS IL excitation, stealing from a small box on the floor for the OMC.
All the configuration was restored except that the HEPA is on. |
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Tue Oct 27 17:58:25 2009, Jenne, Configuration, PEM, Unknown PEM channels in the PEM-ADCU?
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Does anyone know what the channels plugged in to the PEM ADCU, channels 5,6,7,8 are? They aren't listed in the C1ADCU_PEM.ini file which tells
the channel list/dataviewer/everything about all the rest of the signals which are plugged into that ADCU, so I'm not sure if they are used at all, or
if they're holdovers from some previous time. The cables are not labeled in a way that makes clear what they are. Thanks! |
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Tue Oct 27 18:01:49 2009, rob, Update, PSL, hmmm
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| A 30-day trend of the PCDRIVE from the FSS. |
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Tue Oct 27 19:37:03 2009, kiwamu, Update, LSC, cron job to diagnose LSC-timing
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I set a cron job on allegra.martian to run the diagnostic script every weekend.
I think this routine can be helpful to know how the trend of timing-shift goes
The cron runs the script on every Sunday 5:01AM |
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Wed Oct 28 05:02:28 2009, rob, Update, Locking, back
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| LockAcq is back on track, with the full script working well. Measurements in progress. |
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Wed Oct 28 09:12:18 2009, steve, Update, PSL, PMC power on the rise?
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The PMC power is seems to be on the rise, ( MOPA_AMPMON is dropping ?) but I do not think it is real. We have Santa Anna wind condition, when the relative
humidity drops and ......
There is an other funky think. The room temp became rock solid. The PSL HEPAs running at 20% and IFO-room ACs are also in normal operational mode. |
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Wed Oct 28 14:39:10 2009, steve, Update, PEM, after the tour of the 40m
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Illuminators and PSL lights turned off.
HEPA filter speed increased from 20 to 100% |
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Wed Oct 28 17:20:21 2009, rana, Summary, COC, ETM HR reflectivity plot
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This is a plot of the R and T of the existing ETM's HR coating. I have only used 1/4 wave layers (in addition to the standard 1/2 wave SiO2 cap on the
top) to get the required T.
The spec is a T = 15 ppm +/- 5 ppm. The calculation gives 8 ppm which is close enough. The calculated reflectivity for 532 nm is 3%. If the ITM |
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Mon Oct 26 03:57:06 2009, rob, Update, Locking, bad
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Lock acquisition has gone bad tonight.
The initial stage works fine, up through handing off control of CARM to MCL. However, when increasing the AO path (analog gain), there are
large DC shifts in the C1:IOO-MC_F signal. Eventually this causes the pockels cell in the FSS loop to saturate, and lock is lost. |
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Tue Oct 27 18:19:14 2009, rob, Update, Locking, bad
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Quote:
Lock acquisition has gone bad tonight. |
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Thu Oct 29 21:51:07 2009, rob, Update, Locking, bad
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Quote:
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Fri Oct 30 04:41:37 2009, rob, Update, Locking, working again
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I never actually figured out exactly what was wrong in entry 2162, but I managed to circumvent
by changing the time sequence of events in the up script, moving the big gain increases in the common mode servo to the end of the script. So the
IFO can be locked again. |
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Thu Oct 29 13:48:32 2009, Koji, Update, PSL, NPRO LTMP lowered 9.5deg
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13:00 Found MC TRANS less than 7.
13:50 Go into the PSL table.
14:20 Work done. Now I am running SLOWscan script. |
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Thu Oct 29 20:21:14 2009, Koji, Update, PSL, NPRO LTMP lowered 9.5deg
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Here is the plots for the powers. MC TRANS is still rising.
What I noticed was that C1:PSL-FSS_PCDRIVE nolonger hit the yellow alert.
The mean reduced from 0.4 to 0.3. This is good, at least for now. |
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Fri Oct 30 09:24:45 2009, steve, HowTo, MOPA, how to squeeze more out of little
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Quote:
Here is the plots for the powers. MC TRANS is still rising. |
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Fri Oct 30 10:52:56 2009, Jenne, Update, PSL, HEPAs
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| Zach found the HEPA switch on the PSL table OFF. He turned them on. |
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Sun Nov 1 17:58:44 2009, Jenne, Update, General, Update on Video Switch
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The current update on the Chameleon video switch is: no progress.
I connected the old laptop that Rob/Steve acquired via RS-232 serial to the back of the video switch. I'm using P2, the same serial port
that the C1AUX computer was connected to just in case there's something good about P2 vs. P1. |
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Mon Nov 2 10:56:09 2009, kiwamu, Update, LSC, cron job works succesfully & no timing jitter
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As I wrote on Oct.27th, the cron job works every Sunday.
I found it worked well on the last Sunday (Nov.1st).
And I can not find any timing jitter in the data, its delay still stay 3*Ts. |
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Mon Nov 2 13:00:55 2009, Koji, Update, IOO, PMC aligned, MC WFS aligned
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The beam to PMC aligned. The beam to MC WFS cameras aligned.
PMC Trans increased from 2.73 to 2.75 (+1%).
MC Trans increased from 7.80 to 7.87 (+1%). |
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Mon Nov 2 13:34:36 2009, kiwamu, Configuration, PSL, removed multiply resonant EOM
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I removed the multiply resonant EOM that has been set by a SURF student from PSL table.
I will use it for checking the resonant circuit. |
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Mon Nov 2 15:27:08 2009, Jenne, Update, PEM, Gur2 cables have been moved
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The cables labeled "Gur2" which were connected to channels 2,3,4 of the PEM-ADCU have been moved to the PCIX ADC which is connected directly
to the ASS machine. This means that until I (a) put the cables back or (b) figure out how to route channels from the ASS ADC to the RFM, we won't
be able to use these channels for environmental monitoring, nor will they be saved. |
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Fri Oct 9 16:36:13 2009, rob , Update, IOO, frequency noise problem
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I used the XARM as a reference to measure the frequency noise after the MC. It's huge around 4kHz--hundreds of times larger than the frequency
noise the MC servo is actually squashing. This presents a real problem for our noise performance.
An elog search reveals that this noise has been present (although not calibrated till now) for years. We're not sure what's causing it, but |
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Tue Nov 3 03:45:04 2009, rob , Update, IOO, frequency noise problem
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Quote:
I used the XARM as a reference to measure the frequency noise after the MC. It's huge around 4kHz--hundreds of |
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Tue Nov 3 12:47:01 2009, Koji, Configuration, CDS, 1Y9 Rack configuration update
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For the CDS upgrade preparation I put and moved those stuff at the rack 1Y9:
Placed 1Y9-12 ADC to DB44/37 Adapter LIGO D080397
Placed 1Y9-14 DAC to IDC Adapter LIGO D080303 |
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Wed Nov 4 16:49:32 2009, Alberto, Update, LSC, Arm Cavity Finesse Measurement
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I'm going to work on the X arm to measure the arm cavity finesse.
The idea is to measure the cavity transfer function to estimate the frequency of its cavity pole. That should be a more accurate measurement than
that based on the cavity decay time. |
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Wed Nov 4 18:35:19 2009, Alberto, Update, LSC, Arm Cavity Finesse Measurement
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Quote:
I'm going to work on the X arm to measure the arm cavity finesse. |
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Wed Nov 4 21:46:18 2009, Alberto, Update, LSC, Arm Cavity Finesse Measurement
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Quote:
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Thu Nov 5 12:34:26 2009, kiwamu, Update, Computers, elog rebooted
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| I found elog got crashed. I rebooted the elog daemon just 10minutes before. |
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Thu Nov 5 16:24:59 2009, Koji, Update, CDS, ETMY CDS test stuff
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Joe, Peter, Jay, Koji, Rana
We put the new CDS stuff at Y end 1Y9 rack.
Items |
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Thu Nov 5 16:30:56 2009, pete, Update, Computers, moving megatron
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| Joe and I moved megatron and its associated IO chassis from 1Y3 to 1Y9, in preparations for RCG tests at ETMY. |
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Thu Nov 5 16:41:14 2009, josephb, Configuration, Computers, Megatron's personal network
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In investigating why megatron wouldn't talk to the network, I re-discovered the fact that it had been placed on its own private network to avoid conflicts
with the 40m's test point manager. So I moved the linksys router (model WRT310N V2) down to 1Y9, plugged megatron into a normal network port, and
connected its internet port to the rest of the gigabit network. |
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Wed Nov 4 23:17:51 2009, Alberto, Update, LSC, X Arm Cavity transfer Function
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I measured the transfer function between MC_TRANS and TRX and I'm attaching the result.
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Thu Nov 5 05:07:22 2009, rana, Update, LSC, X Arm Cavity transfer Function
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I would have guessed that you have to calibrate the detectors relative to each other before trying this. Its also going to be tricky if you use 2 different
kinds of ADC for this (c.f. today's delay discussion in the group meeting).
I think Osamu used to look at fast transmission signals by making sure the PD at the end had a 50 Ohm output impedance and just drive the 40m long |
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Thu Nov 5 19:25:11 2009, Alberto, Update, LSC, X Arm Cavity transfer Function
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Quote:
I would have guessed that you have to calibrate the detectors relative to each other before trying this. Its also |
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Thu Nov 5 22:30:09 2009, Alberto, Update, LSC, X Arm Cavity Transfer Function
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It seems that just repeating the measurement was enough to get a good transfer function of the x arm cavity. Here's what I got.
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Fri Nov 6 00:23:34 2009, Alberto, Configuration, Computers, Elog just rebooted
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| The elog just crashed and I rebooted it |
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Fri Nov 6 07:55:59 2009, steve, Update, Computers, RFMnetwork is down
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| The RFMnetwork is down. MC2 sus damping restored. |
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Fri Nov 6 09:17:53 2009, steve, Omnistructure, PEM, PSL HEPAs turned on
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| The PSL enclosure HEPAs turned on at 30% |
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Fri Nov 6 10:35:56 2009, josephb, Update, Computers, RFM reboot fest and re-enabled ITMY coil drivers
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As noted by Steve, the RFM network was down this morning. I noticed that c1susvme1 sync counter was pegged at 16384, so I decided to start with
reboots in that viscinity.
After power cycling crates containing c1sosvme, c1susvme1, and c1susvme2 (since the reset buttons didn't work) only c1sosvme and c1susvme2 came |
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Fri Nov 6 12:56:30 2009, Haixing, Update, SUS, Magnet has been levitated
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Fri Nov 6 16:27:15 2009, Jenne, Update, PEM, Ranger moved
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The Ranger seismometer has been moved to ~the middle of the Mode Cleaner tube, and it's orientation has been changed to horizontal (using all of the
locking/mass centering procedures). This is similar in orientation to the way things were back in the day when Rana and Matt had the OAF running
nicely. |
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Fri Nov 6 17:04:01 2009, josephb, Configuration, Computers, RFM and Megatron
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I took the RFM 5565 card dropped off by Jay and installed it into megatron. It is not very secure, as it was too tall for the slot and could not
be locked down. I did not connect the RFM fibers at this point, so just the card is plugged in.
Unfortunately, on power up, and immediately after the splash screen I get "NMI EVENT!" and "System halted due to fatal NMI". |
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Fri Nov 6 18:02:22 2009, josephb, Update, Computers, Elog restarted
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While I was writing up an elog entry, the elog died again, and I restarted it. Not sure what caused it to die since no one was uploading to it
at the time. |
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Fri Nov 6 18:13:34 2009, josephb, Update, Computers, Megatron woes
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I have removed the RFM card from Megatron and left it (along with all the other cables and electronics) on the trolly in front of the 1Y9 rack.
Megatron proceeded to boot normally up until it started loading Centos 5. During the linux boot process it checks the file systems.
At this point we have an error: |
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Fri Nov 6 18:52:09 2009, pete, Update, Computers, RCG ETMY plan
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Koji, Joe, and I are planning to try controlling the ETMY, on Monday or Tuesday. Our plan is to try to do this with megatron out of
the RFM loop. The RCG system includes pos, pit, yaw, side, and oplevs. I will use matrix elements as currently assigned (i.e. not the ideal
case of +1 and -1 everywhere). I will also match channel names to the old channels. We could put buttons on the medm screen to control the |
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Thu Oct 29 18:04:02 2009, Jenne, Update, Adaptive Filtering, More work on saving coeffs on the OAF screen
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[Sanjit,Jenne]
Sanjit has been working today on trying to get the OAF coefficients to save properly. Alex got us most of the way, but right now it's looking
like the filter that is being saved is totally constant (all the values are the same). We're poking around trying to figure out why this is. |
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Thu Oct 29 18:25:33 2009, Sanjit, Update, Adaptive Filtering, More work on saving coeffs on the OAF screen
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Quote:
[Sanjit,Jenne] |
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Mon Nov 2 21:09:15 2009, Sanjit, Update, Adaptive Filtering, More work on saving coeffs on the OAF screen
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I made some changes in the code (all commented in the installed and SVN version) to print the filter coefficients. I got crazy output. Sometimes
memory bugs lead to such crazy behavior. So far I could not find any bugs, but will have to spend more time on it. |
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Fri Nov 6 19:25:31 2009, Sanjit, Jenne, Joe, Update, Adaptive Filtering, More work on saving coeffs on the OAF screen
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Quote:
I made some changes in the code (all commented in the installed and SVN version) to print |
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Fri Nov 6 19:29:24 2009, Jenne, Update, elog, elog acting up
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| elog was acting up again (not running), so I restarted it. |
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Fri Nov 6 20:10:15 2009, Jenne, Update, elog, elog acting up
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Quote:
elog was acting up again (not running), so I restarted it. |
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Fri Nov 6 23:02:44 2009, Haixing, Update, General, SR785 Spectrum Analyzer
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I am using SR785 Spectrum Analyzer now and also tomorrow.
I will put it back on Sunday. If anyone needs it during the weekend,
please just take it and I can reset it by myself later. Thanks. |
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Sat Nov 7 23:50:45 2009, Haixing, Update, General, Open-loop transfer function of the magnetic levitation system
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I measured the open-loop transfer function of the magnetic levitation system.
The schematic block diagram for this measurement is the following:
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Sun Nov 8 14:18:25 2009, Alberto, Update, SUS, ETMY Watchdogs tripped
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This afternoon I re-enabled the ETMY coils after I found that the watchdogs for the mirror had tripped last night
at 2:06am. |
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Sun Nov 8 22:50:29 2009, Alberto, Update, ASC, IFO Alignment
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Tonight I aligned the IFO by running the scripts one by one.
SRC was far off and I had to align SRM by hand before the script could work. SPOB is still low when DRM is aligned.
I'm restoring the full IFO now that I'm taking off. |
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Mon Nov 9 01:52:56 2009, rana, Update, PEM, coherence v. time for 2 accelerometers
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I used the coh_carpet.m function from the mDV to calculate this plot:
coh_carpet('C1:PEM-ACC_MC1_X','C1:PEM-ACC_MC2_X',gps('now - 3 days'),3600*12,4,10,64)
It shows the coherence v. time of two of our X-direction accelerometers starting around 1AM on Friday and |
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Mon Nov 9 08:43:16 2009, steve, Update, SUS, MC2 damping restored
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| MC2 damping restored, MZ locked and the arms are flashing now. |
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Mon Nov 9 11:11:19 2009, Alberto, Configuration, LSC, MC2 Watchdogs tripped
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The MC2 watchdogs tripped. I just restored them.
I also had to relock the MZ and then the Mode Cleaner. |
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Mon Nov 9 11:14:57 2009, Alberto, Update, ABSL, Started working on the PSL table
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| I'm working on the PSL table to set up the PLL setup for the AbsL experiment. |
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Mon Nov 9 12:09:10 2009, Alberto, Omnistructure, Environment, BNC Cable Laid Down from South End to East VErtex
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I laid down the floor a BNC cable from the Y End table to the BNC Chamber. The cable runs next to the east wall.
I'm leaving the cable because it can turn useful in the future.
I'm tying the end of the cable to a big threaded steel rod on the side of the BS chamber. |
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Mon Nov 9 13:17:07 2009, Alberto, Configuration, ABSL, NPRO on
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| I turned the auxialiary NPRO for the AbsL Experiment on. Its shutter stays closed. |