I was able to check out the 40m SVN here in Livingston using this command:
svn co svn+ssh://email@example.com/cvs/cds/caltech/svn/trunk/medm
As you might guess, this uses ssh in place of the web server (which we don't have yet).
PMC_cal (m/V) = (1064 nm)/2 / V_FSR
scp Particle.st firstname.lastname@example.org:/cvs/cds/lho/target/t0sandbox0
scp Particle.o email@example.com:/cvs/cds/caltech/target/c1psl/
netgpibdata.py -i 220.127.116.11 -d AG4395A -a 10 -f spectrum01
elogkeywd keyword1 keyword2 keyword3
To use the Sensoray 2250 USB frame grabber:
Ensure you have the following packages installed: build-essential, libusb-dev
Download the Linux manual and linux SDK from the Sensoray website at:
Go to the Software and Manual tab near the bottom to find the links. The software can also be found on the 40m computers at /cvs/cds/caltech/users/josephb/sensoray/
The files are Manual2250LinuxV120.pdf and s2250_v120.tar.gz
Run the following commands in the directory where you have the files.
tar -xvf s2250_v120.tar.gz
sudo make modules_install
At this point plug in the 2250 frame grabber.
sudo modprobe s2250_ezloader
Now you can run the demo with
./sraydemo or ./sraydemo64
Options will show up on screen. A simple set to start with is "encode 0", which sets the recording type, "recvid test.mpg", which starts the recording in file test.mpg, and "stop", which stops recording. Note there is no on screen playback. One needs an installed mpeg player to view the saved file, such as Totem (which can screen cap to .png format) or mplayer.
All these instructions are on the first few pages of the Manual2250LinuxV120 pdf.
I tested the cryopump interlock today. It is touchy. I do not have full confidence in it.
I'm proposing that VC1 gate valve should be kept closed while nobody is working in the 40m lab.
How to open gate valve:
1, confirm temp of 12K on the gauge at the bottom of the cryopump
2, if medm screen cryo reads OFF( meaning warm) hit reset will result reading ON (meaning cold 12K )
3, open VC1 gate valve if P1 is not higher than 20 mTorr
VC1 was closed at 18:25,
IFO condition: not pumped,
expected leak plus out gassing should be less than 5 mTorr/day
The RGA is in bg-mode, annuloses are closed off
To set the demod phase for RF CARM, sensed at REFL2 (REFL 166I), it suffices to set the demod phase for REFL2 to be the optimal phase for controlling SRCL in a no-arm state.
For POX33, the ideal phase for single arm locking does not yield a zero-offset CARM signal. So the offset needs to be manipulated digitally.
The Cryo pump is running reliably since April 22 hence there is no need to close VC1 repeatedly.
The photo switch interlock was put back onto the H2 vapor pressure gauge and it is working.
The Elog started crashing last night. It turns out I was the culprit, and whenever I tried to upload a certain 500kb .png picture, it would die. It has happened both when choosing "upload" of a picture, and when choosing "submit" after successfully uploading a picture. Both culprits were ~500kb .png files.
tdsavg 5 C1:LSC-PD4_DC_IN1
was causing grievous woe in the cm_step script. It turned out to fail intermittently at the command line, as did other LSC channels. (But non-LSC channels seem to be OK.) So we power cycled c1lsc (we couldn't ssh).
Then we noticed that computers were out of sync again (several timing fields said 16383 in the C0DAQ_RFMNETWORK screen). We restarted c1iscey, c1iscex, c1lsc, c1susvme1, and c1susvme2. The timing fields went back to 0. But the tdsavg command still intermittently said "ERROR: LDAQ - SendRequest - bad NDS status: 13".
The channel C1:LSC-SRM_OUT16 seems to work with tdsavg every time.
Let us know if you know how to fix this.
Did you try restarting the framebuilder?
What you type is in bold:
op440m> telnet fb40m 8087
Restarting the framebuilder didn't work, but the problem now appears to be fixed.
Upon reflection, we also decided to try killing all open DTT and Dataviewer windows. This also involved liberal use of ps -ef to seek out and destroy all diag's, dc3's, framer4's, etc.
That may have worked, but it happened simultaneously to killing the tpman process on fb40m, so we can't be sure which is the actual solution.
To restart the testpoint manager:
what you type is in bold:
rosalba> ssh fb40m
fb40m~> pkill tpman
The tpman is actually immortal, like Voldemort or the Kurgan or the Cylons in the new BG. Truly slaying it requires special magic, so the pkill tpman command has the effect of restarting it.
In the future, we should make it a matter of policy to close DTTs and Dataviewers when we're done using them, and killing any unattended ones that we encounter.
Q. When should we use plano-convex lenses, and when should we use bi-convex?
As I had the same question from Jenne and Dmass in a month,
I just like to introduce a good summary about it.
Lens selection guide (Newport)
At a first order, they have the same function.
Abberation (= non-ideal behavior of the lens) is the matter.
There are two new Matlab files on the svn in /mDV/extra/C1. 'mycsd.m' is to calculate the cross-spectral density between two channels, 'csd_40T_40T_SS1.m' calls this function with the available seismic channels and derives a self-noise spectrum for the vertical axis using all three seismometers. The method requires that there are no correlations between two instruments only which is a bad idealization for certain frequencies if you have seismometers of totally different types.
'mycsd.m' uses the high-gain, low-resolution Nuttall window (built-in Matlab function 'nuttallwin.m'). High-gain windows are used for broad-band spectra like seismic spectra, but it should be exchanged by another window if you plan to look at small-bandwidth features like peaks.
Since the three-channel analysis does not require knowledge of response functions, it could be used to evaluate the performance of the adaptive filter. For example, if three channels responding to the same signal are available, then the ratio of any two csds corresponds to one of the relative transfer functions. You can then compare this function with the result produced by the adaptive filter.
There were no injuries...Now we need to get some new chairs.
The control room desk tops heights on the east side were lowered by 127 mm
As Rob noted last Friday, the UPS which powers the Vacuum rack failed. When we were trying to move the plugs around to debug it, it made a sizzling sound and a pop. Bad smells came out of it.
Ben came over this week and measured the quiescent power consumption. The low power draw level was 11.9 A and during the reboot its 12.2 A. He measured this by ??? (Rob inserts method here).
So what we want is a 120 V * 12.2 A ~ 1.4 kVA UPS with ~30-50% margin. We look for this on the APC-UPS site:
On Monday, we will order the SUA2200 from APC. It should last for ~25 minutes during an outage. Its $1300. The next step down is $200 cheaper and gives 10 minutes less uptime.
The new APC Smart -UPS 2200VA is now running at the vacuum rack. There are 2 load monitoring leds on out of 5
Maglev, dry pumps and roughing pumps are not using UPS.
The switch over went smoothly with Yoichi's help.
First we closed all vacuum valves and stopped the two small turbos.
Than turned power off to instruments in the vac-rack and VME: c1vac1 & c1vac2
Maglev was left running.
Now we moved the AC plugs from the wall receptacles over to the back of the UPS and powered them up.
Varian turbos were restarted and vacuum valves were restored in order to reach vacuum normal condition.
See 40m Vacuum System States and Sequences Manual of 10-24-2001
Linux 3 desk top computer is out of order at the pump spool. We should replace it.
The vacuum control screen can be pulled up on a lap top: /cvs/cds/caltech/medm/c0/ve/VacControl_BAK.adj
I've created a 40m Google account. Please post all the 40m related photos to this site. If you don't already have it, download Picasa to make this easier.
40m Installation Photos">
the password is in the usual password place.
I drove MC2 in POS and used the resulting response in MC_F to calibrate the IOO-MC_L channel.
Yoichi did an excellent job of calibrating MC_F last year. I have used his calibration of MC_F (220 Hz/count @ DC) to get the MC_L calibration at DC as well as at high frequencies. The hardware dewhitening was OFF for all these measurements.
1. For the DC measurement I excited C1:SUS-MC2_MCL_EXC at 0.0731 Hz. At these frequencies, the MC_L path has much more gain than the MC_F path. So this excitation at the error point makes the length path to drive itself to cancel the digital excitation. Since the overall MC servo gain is huge, this causes the MC_F path to compensate the residual MC_L motion. One can simply take the ratio of MC_L/MC_F to get the calibration of MC_L in Hz.
2. For the AC measurement, I engaged FM9 of the MC2_MCL filter bank. This guy is an elliptic LP with a notch at 660.38 Hz. I then drove MC2_LSC at 660.38 Hz with a sine wave of 500 counts amplitude. The notch makes the gain of the MC_L feedback zero at that frequency. So MC_F has to do all the work. We can simply measure the ratio of MC2_LSC/MC_F to get the AC calibration of MC2_MCL_OUT (aka IOO-MC_L) and MC2_LSC_OUT (aka LSC-MC_L).
MCF/MCL @ 0.0731 Hz = 569.4. So the MC_L calibration at DC is 220 x 569.4 = 125 kHz/count or 6.02 nm/count.
From this we would expect the AC calibration to be (6 nm/count)*(660.38/f_pend)^2 = 13.0 x10^-15 m/count.
The AC measurement gave 1445 counts_peak** of MC_F for the 500 counts (peak) excitation in MC2_LSC. From Yoichi's entry we get that the high frequency calibration of MC_F should be 0.089 Hz/count. So the MC_L calibration at 660 Hz is 0.089*1445/500 = 0.25 Hz / count or 12.3 x 10^-15 m/count. So the AC/DC ratio is close to 1.
Splitting the difference, the new official MC_L calibration is 5.87 nm/counts @ DC with a complex pole pair at 0.972 Hz.
** note: To convert from the peak height observed in DTT with a 50% Overlap Hanning window you must use the following intuitive formula: counts_peak = (counts / rHz) * sqrt(2 * BW). In this case, BW is the number that DTT reports as BW on the screen, NOT the BW that you asked for on the measurement tab.
*** note: when measuring peak heights in a DTT FFT, make sure to unclick the box for 'Bin' under the config tab. Bin suppresses peaks in a plot with a lot of points and is ON by default.
**** note: I have updated the MCF reference in the Templates directory with the Yoichi calibration - spectrum attached. This is probably the most accurate MCF spectrum we have ever put in the elog in the history of the 40m. The implication is that the VCO phase noise is ~5 mHz/rHz. Not bad.
***** note: with the OAF off, I drove a 1.55 Hz sine wave into MC1 and measured the ratio of MC1_MCL_OUT/IOO-MC_L. This gives the DC calibration of MC1_MCL_OUT = 7.98 nm/count.
I have gotten the hang of the procedure for measuring phase noise on the AOMs.
Koji suggested I right up a short guide (wiki page?) on how to do this.
I will finish up here, then go measure the AOMs at the other lab (may have to be tomorrow, after laser safety), and then write up the instructions.
Kiwamu, Alex and Zach are practicing mandatory IR-safety scan at the 40m-PSL
40m specific safety indoctrination were completed.
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.
Koji did a nice job increasing light power with some joggling.
1/4" exposure, standard room lights 3" exposure, slowly moving LED bar light from ~60 cm distance
Because of the light behind, the focus was attracted by the far objects...
Evenso the magnet ball looks better in the right picture.
The technique is as follows:
Use longer exposure time, move the LED bar illumination through the area like painting the light everywhere.
It is supposed to provide a picture with more uniform light and the diminished shadow.