ITMX Pitch: 142 microrad/counts
ITMX Yaw: 145 microrad/counts
ITMY Pitch: 257 microrad/counts
ITMY Yaw: 206 microrad/counts
ETMX Pitch: 318 microrad/counts
ETMX Yaw: 291 microrad/counts
ETMY Pitch: 309 microrad/counts
ETMY Yaw: 299 microrad/counts
BS Pitch: 70.9 microrad/counts
BS Yaw: 96.3 microrad/counts
PRM Pitch: 78.5 microrad/counts
PRM Yaw: 79.9 microrad/counts
SRM Pitch: 191 microrad/counts
SRM Yaw: 146 microrad/counts
We found c1lsc, c1iscex, c1iscey, c1susvme, c1asc and c1sosvme are dead.
We turned off all watchdogs and turned off all lock of suspensions.
Then, I tried to reboot these machines from terminal, but I couldn't login to all of these machines.
So, we turned off and on key switches of these machines physically, and login to them to run startup scripts.
Then we turned on all watchdogs and restored all IFO.
Now they look like they are working fine.
The outside particle counts for 0.5 micron are 3 million this morning at 9am. Low clouds, foggy condition with low inversion layer.
This makes the 40m lab 30-50K
I just turned on the HEPA filter at the PSL enclosure.
Please, leave it on high
SRM, ITMX, ETMX, ITMY and ETMY lost damping at 4:55am this morning from 4.8 magnitude earthquake.
Their damping were restored.
C1:SUS-ITMX_URSEN_OUTPUT swich was found in off position. It was turned on.
MZehnder and MC were locked.
The WFS qpd spot needs recentering
ITMX, ITMY, BS, SRM, PRM op levs were all recentered. ETM's looked okay enough to leave as-is.
[Rana, Jamie, Jenne]
SPOB DC hasn't been so good lately, so we installed a new PO DC PD on the PO table. We used a 30% reflecting beam splitter (BS1-1064-30-1025-someotherstuff). We didn't check with a power meter that it's a 30% BS, but it seems like that's about right. The beamsplitter is as close as we could get to the shutter immediately in front of the regular POB/SPOB PD's, since that's where the beam gets narrow. The new picked-off-pickoff beam goes to a Thorlabs 100A PD. We haven't yet checked for reflected beams off the PD, but there is a spare razor blade beam dump on the table which can be used for this purpose. The output of this PD goes to the LSC rack via a BNC cable. (This BNC cable was appropriated from it's previous "use" connecting a photodiode from the AP table to a bit of air just next to the LSC rack.) Our new cable is now connected where the old SPOB DC cable used to be, at the input of a crazy Pomona Box tee.
For reference, the new levels of POB DC and SPOB DC, as measured by their BNC DC out connections is ~4mV each. Since the beamsplitter is 70% transmissive, we used to be getting about 5.7mV on each PD.
The new photodiode puts out about 40mV, but it has an ND1.0 filter on, so if more gain is needed, we can take it off to get more volts.
SUS-MC1_SENSOR_SIDE and SUS-MC2_SENSOR_UL are glitching
Yesterday's 4.8mag earthquake at Salton Sea is shown on Channel 1
C1:IOO-MC_BOOST1 0 (You can turn it on if you want, but turn it off for locking)
C1:IOO-MC_POL 1 (Minus)
C1:IOO-MC_LIMITER 1 (Disable)
C1:PSL-FSS_SW1 0 (Test1 ON)
C1:PSL-FSS_FASTGAIN 14 (Do not increase it, at least while locking. Otherwise the phase lag from the PZT loop gets significant and the MC loop will be conditionally stable).
When all things fail (netgpibdata.py is giving me weird data. When I plot the data it has saved from the 4395A, it's some wierd other universe's version of my transfer function. I don't really know what's up. I'm pretty sure I'm getting the 'correct' data, since each TF looks vaguely like it should, but with some crazy humps. I'll talk to Yoichi in the morning about it maybe.) (also, we're low on emergeny floppy discs), you can always take a picture of the Agilent 4395's screen, as shown below.
* Mode cleaner and PMC are both relocked after my shenanigans, and I'll try again in the morning (I assume locking is going on tonight) to get real TF's with real data, as opposed to the photo method.
Note to self: post the data of the TFs in the elog along with the plots, for posterity.
These TFs are of the Mode Cleaner servo board, exciting IN1 (or the 3.7MHz notch pomona box which is connected to IN1), and measuring at the SERVO out of the board.
One with the box, one without the box, and one of just the box for good measure.
netgpibdata.py is giving me weird data. When I plot the data it has saved from the 4395A, it's some wierd other universe's version of my transfer function. I don't really know what's up.
Yoichi, in all his infinite wisdom, reminded me that the netgpibdata script saves the data as the REAL and IMAGINARY parts, not the Mag and Phase. Brilliant. Using that nugget of information, here are the TFs that I measured earlier:
The last attachment is the .dat and .par files which contain the data and measurement parameters for the 3 TFs in the plots.
We ran cable from the suspension rack to the IOO rack to record the signals with DAQ channels.
The test channels:
UL coil C1:IOO-MC_DRUM1 (Caryn was using, we will replace when we are done)
UL input C1:IOO-MC_TMP1 (Caryn was using, we will replace when we are done)
LR coil C1:PEM-OSA_SPTEMP
LR input C1:PEM-OSA_APTEMP
We will leave these overnight; we intend to remove them tomorrow or Monday.
We closed the PSL shutter and killed the MC autolocker.
ETMY sus damping was found to be tripped.
It was retored.
All fluorecent light were turned off. Please try to conserve some energy.
Eric Gustafson is handling the old HP4291A rehabilitation. Tarac picked both units up today.
March of 2008 Tucker Electronics failed to fix it's intermittent ~25MHz 0.5V oscillation at the swept sine output
See 40m-elog id:398 on 3-24-2008 by Rob Ward
The Caltech gasoline storage tank is being upgraded.
They are jack hammering and digging with bulldozer 50 yards south of ETMY
Thanks to Joe B who made the SRS RGA working with linux
Last data file logged at 2008 Oct 24 with old Dycor unit
First data file logged at 2009 Feb 10 with SRS
Rga scan of day 231 since pumpdown pd66-m-d231
m stands for maglev pumping speed, vacuum normal condition of valves,
cc4 cold cathode gauge at the rga location,
cc1 is real ifo pressure from the 24" tube at the pumpspool,
PEM-count temp: vac envelope temp at the top of IOO chamber
Old Guralp is hooked back up, the new one is sitting next to it, disconnected for now.
Cold cathode gauge CC4 is reading normal.
CC1 is glitching, it is probably dirty.
CC2 is fluctuating too much and it is cutting out for 6-7 minutes. It must be insulated by deposits and there is no emission current.
I think the same goes for P1
They will have to be replaced at the next vent
Last night, we put the IFO in FP Michelson configuration. We took transfer functions of CARM and DARM, first using CM excitations directly on the ETMs, and then using modulations of the laser frequency via MC excitation. We found that there was basically no coupling into DARM using the MC excitation, but that there was coherence in DARM using the ETM excitation. Therefore, I tuned the ETM common mode in the output matrix. I did this by taking transfer functions of PD1_Q with PD2_I (see attached plot). I changed the drdown_bang script to set C1:LSC-BTMTRX_14 0.98 and C1:LSC-BTMTRX_24 1.02.
I tried to play an .avi file on allegra. In a normal universe this would be easy, but because its linux I was foiled.
The default video player (Totem) doesn't play .avi or .wmv format. The patches for this work in Suse but not Fedora. Kubuntu but not CentOS, etc.I also tried installing Kplayer, Kaffeine, mplayer, xine, Aktion, Realplay, Helix, etc. They all had compatibility issues with various things but usuallylibdvdread or some gstreamer plugin.So I pressed the BIG update button. This has now started and allegra may never recover. The auto update wouldn't work in default mode becauseof the libdvdread and gstreamer-ugly plugins, so I unchecked those boxes. I think we're going to have this problem as long as we used any kind ofadvanced gstreamer stuff for the GigE cameras (which is unavoidable).
I noticed that the ISS Mean Value and CS Saturation were both RED and unhappy. (The alarms were going off, and they were both red on the MEDM screen). None of the MEDM settings seemed off kilter, so we went out to take a look at the PSL table.
Rob checked that light is indeed going to both of the ISS photodiodes (Morag and Siobhan). Next we checked that all the cables were good, and that the power to the ISS box was plugged in. In this process, Rob wiggled all the cables to check that they were plugged in. Just after doing this, the Mean Value and CS Sat were happy again. Rob thinks the current shunt connection might be bad, but we don't really know which one it was since all of the cables were jiggled between our checking the screens.
Right now, everything is happy again, but as with all bad-cabling-problems, we'll probably see this one again.
I don't know why in particular the connection decided to spaz out this afternoon...I don't think anyone opened the PSL table before Rob and I went to investigate. I was working on the PMC servo (checking the LO levels...to be posted in a couple minutes), but didn't have anything to do with the ISS. After I was done, I put everything back, and locked the PMC and the MC, and everything was good, until some time later when the ISS started flipping out.
I don't know who left the X arm locked, but I just ran the Align Full IFO script, so everything is good in case Yoichi/someone comes in to lock the IFO this weekend.
I have calibrated the PMC LO Mon (C1:PSL-PMC_LODET) on the PMC's EPICS screen, by inputting different RF LO levels into the LO input of the PMC servo board.
Since the RF output adjust slider on the PMC's Phase Shifter screen doesn't do a whole lot (see elog 1471), I used a combination of attenuators and the slider to achieve different LO levels. I measured the level of the attenuated RF out of the LO board using the 4395A in spectrum analyzer mode, with the units in dBm, with 50dB attenuation to make it stop complaining about being overloaded. For each row in the table I measured the RF level using the 4395, then plugged the cable back into the PMC servo board to get the EPICS screen's reading.
The last 2 columns of the table below are the 'settings' I used to get the given RF LO level.
When the new mixers that Steve ordered come in (tomorrow hopefully), I'll put in a Level 13 mixer in place of the current Level 23 mixer that we have. Also, Rana suggested increasing the gain on the op-amp which is read out as the LO Mon so that 13dBm looks like 1V. To do this, it looks like I'll need to increase the gain by ~80.
% Compute DC fields, and DC signals, and AC transfer functions
% This is a parallelized version of tickle. You have to run matlabpool(n)
% command before using this command. matlabpool(n) will invoke n instances
% of matlab workers in your computer. Once you have started those workers,
% you can reuse them many times (i.e. you don't have to run matlabpoo(n)
% every time you use ptickle). Usually n should be equal to the number of
% CPU cores in your computer, but the Matlab parallel computing toolbox has
% the limit of maximum 4 workers for a local computer. If you use a cluster
% of computers across a network, this limit does not apply. But I haven't
We found that DMF/ was not an SVN working copy, so I wiped out the SVN version, imported the on-disk copy, moved it to DMFold/ and then checked out the SVN version.
We can delete DMFold/ whenever we are happy with the SVN copy.