 Thu Apr 12 20:56:07 2012, Den, Update, PEM, daq
|
GUR1 XYZ, GUR2 XYZ, MC_F channels are now recorded at 256 Hz.
EDIT by JCD: What Den means to say here is that (a) he modified some
.ini files, and (b) he restarted the fb. |
Thu Apr 12 08:49:14 2012, Den, Update, SUS, local damping and WFS 6x
|
I tried to figure out what can add noise below 0.5 Hz to the MC_F. I compared MC1, MC2, MC3 suspos, suspit, susyaw and susside positions with damping
(black curves) and without (red curves). Local damping is fine.
|
 Thu Apr 12 14:48:44 2012, Suresh, Update, SUS, local damping and WFS
|
WFS servo is moving the MC mirror angles to minimise TEM01 and TEM10 modes within the MC cavity. This means it will compensate
not only for angular noise in the mirrors but also for the PSL beam pointing fluctuations. So the extra "noise" we see when WFS loops are
on is because they are active below the WFS UGF of about 2 Hz. Also if the HEPA airflow is above 20% (of its max), the PSL beam jitter (caused by |
|
Thu Apr 12 00:40:45 2012, Jenne, Update, SUS, PRM, BS oplevs off
|
There's a beam dump after the HeNe on the BS oplev table, since the IPPOS measurement optics (steering mirrors) are in the way of the oplev beams.
Don't enable the BS or PRM oplevs!!!! We'll post
a notice in the elog when the oplevs are back to normal. |
|
Thu Apr 12 00:16:38 2012, Jenne, Update, Environment, Earthquake - moderate
|
M4.7 - Santa Isabel, Mexico 2012-04-12 06:48:38 UTC
Mode Cleaner doesn't want to stay locked. Seismic
is coming down from an earthquake ~20min ago. |
|
Wed Apr 11 22:48:39 2012, rana, Update, Environment, BLRMS
|
| |
|
Tue Apr 10 17:02:29 2012, Jenne, Update, IOO, Mode matching recollections and conclusions
|
...Mostly just recollections at this point.
I re-looked at the mode matching's sensitivity to misplaced optics. Here is the plot that the original MMT code from 2010 spits out:
|
|
Wed Apr 11 18:19:51 2012, Jenne, Update, IOO, Mode matching recollections and conclusions
|
Another histogram. This one allows the MMT mirror positions to move, the MMT incident angle for both curved optics to change, and the MC waist
size and position to change. The error quoted for the MC waist size measurement from 2010
was +\- 0.01mm, and the MC waist position was +\- 28mm. |
|
Wed Apr 11 17:56:26 2012, Jenne, Update, General, Summary of things to figure out with the IFO
|
Questions:
Power recycling gain
* It should be ~40, but we observe/measure it to be ~7. Even if mode matching of ~50% is assumed, gain is calculated to be ~15 |
|
Wed Apr 11 16:33:16 2012, Jenne, Bureaucracy, General, 40m Meeting Action Items
|
Action Items from Last Week:
(non-existant)
----------------------------------------------------------------------- |
|
Tue Apr 10 13:42:54 2012, Jenne, Update, Environment, Plumbing guys are here
|
| I don't know why, but they're looking around on the roof, and inside our ceiling above the bathrooms. |
|
Wed Apr 11 14:34:48 2012, Jenne, Update, Environment, Plumbing guys are here
|
Quote:
I don't know why, but they're looking around on the roof, and inside our ceiling above the bathrooms. |
|
Tue Apr 10 11:08:29 2012, tara, Update, PSL, curved mirror behind AOM removed
|
We removed the curved mirror behind the AOM (ROC=0.3m) on PSL table. The mirror is now in PSL lab. See PSL:905
for more detail. |
|
Mon Apr 9 18:18:14 2012, kiwamu, Update, LSC, DRMI time series
|
Here is a time series when the DRMI is being locked.
You can see that the AS110 goes up because the SRCL is engaged and amplifies the 55 MHz sidebands.
|
|
Mon Apr 9 17:03:38 2012, Den, Update, Environment, Lms vs Wiener
|
I tried to figure out why offline LMS filter subtract seismic noise much better from MC_F then the Wiener filter. I did the calculations twice - with
my codes and with Matlab in-build functions, the results are the same. So this is not a code error.
The coherence between GUR 1, 2 and MC_F is still poor. Wiener filter is linear and its performance is confined to the frequency ranges where we |
|
Mon Apr 9 15:02:30 2012, Jenne, Update, LSC, Locked MICH
|
I was going to try some locking, but things are a little too noisy.
Just so Kiwamu knows what I did today, in case he comes back....
I ran LSCoffsets, and aligned both X and Y arms and saved their positions, and aligned MICH, and saved the BS position. |
|
Mon Apr 9 15:09:34 2012, Jenne, Update, LSC, Locked MICH
|
Quote:
I was going to try some locking, but things are a little too noisy. |
|
Thu Apr 5 07:19:16 2012, kiwamu, Update, LSC, DRMI locking
|
I tried locking the DRMI to the signal-extraction condition with the new trigger by AS110.
A first thing I tried was : flipping the control sign of the SRCL while keeping the same control setups for the PRCL and MICH.
Occasionally the DRMI was "sort of" locked and hence I believe this setup must be a good starting |
|
Sat Apr 7 01:56:05 2012, kiwamu, Update, LSC, OSA signal in DRMI condition
|
It wasn't a dream or illusion -- I was locking the DRMI to the right condition last Wednesday (#6489).
Here is a snap shot of the AS-OSA signal taken today when the DRMI was locked with the same control settings (#6489).
The blue curve is data taken when the PRMI was locked for comparison. |
|
Sat Apr 7 06:58:34 2012, kiwamu, Update, LSC, DRMI lock : lost good alignment
|
Somehow I lost the good alignment, where the lock can be frequently acquired and hence I didn't go further ahead.
I will try locking the DRMI during the weekend again. My goal is to take time series when the DRMI is being locked and sensing matrix.
|
|
Sat Apr 7 02:01:29 2012, Mike J., Update, Computers, Projector Cable Management
|
I replaced the projector video and power cables with longer ones, and zip-tied them to the ceiling and wall so they don't block the image.
|
|
Mon Apr 2 18:24:34 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
I extended my RAM script from DRMI (3DoF) to the full IFO (5DoF).
Again, it calculates the operation point offsets for each DoF from the opt model with RAM. Then the position offsets are added to the model, and
calculates the LSC matrix. RAM level is assumed as 0.1% of the PM modulation level, as usual, and lossless for a simple model. |
|
Tue Apr 3 01:52:15 2012, Zach, Update, LSC, RAM simulation for Full ifo
|
Quote:
I also would like to extend this script to use the DC readout, but don't know how to calculate the postion offset for AS_DC because |
|
Tue Apr 3 14:11:33 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
Quote:
|
|
Tue Apr 3 14:17:18 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
I add a flow-chart drawing what the scripts do and how the scripts calculate the LSC matrix.
|
|
Tue Apr 3 15:50:58 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
Oops, Yesterday's results for DARM was wrong!
I got more convincing results now. |
|
Tue Apr 3 22:50:37 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
Koji and Jamie suggested me to include the coupling between DoFs when I calculate the last matrix. So far, I just add
all the pos-offsets of 5 DoFs and re-calculate the matrix again. However, once I add one DoF pos-offset, it could already change the LSC matrix therefore
different pos-offset to the other four DoF, we must iterate this process until we get the equilibrium pos-offsets for 5 DoFs. |
|
Wed Apr 4 23:57:35 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
I'm still wondering whether iteration version or simple version is closer approximation to the real situation. Sorry for few explanations here.
I will try to present those on Friday.
|
|
Sat Apr 7 00:31:12 2012, keiko, Update, LSC, RAM simulation for Full ifo
|
I didn't understand how CARM can be decreased 2 orderes of magnitude and PRCL can be INCREASED by such small offsets
(see the matrix quoted).
Apparently it was because of an optical-spring ish effect from the "detuning" (which is actually RAM |
|
Fri Apr 6 19:40:57 2012, Mike J., Summary, General, Laser Emergency Shutoff
|
| I accidently shut off the laser at 19:34 with the emergency shutoff button while trying to tap into a video line for the Sensoray device. |
|
Fri Apr 6 20:05:12 2012, Jamie, Summary, General, Laser Emergency Shutoff
|
We reset the interlock and restarted the PSL. The end AUX lasers seem to have come back online fine. PMC and mode cleaner locked back up
quickly. |
|
Fri Apr 6 19:04:35 2012, Jenne, Update, PEM, STS releveled, GUR2 plugged in
|
[Den, Jenne]
We were wondering why the STS-2 signal was funny. When I went to look at it, the X-axis indicator was pointing ~45deg from the x-axis, so
that it was pointing between the arms of the IFO. Also, the bubble in the level was totally stuck on one side. We locked the masses, and I |
|
Fri Apr 6 16:35:37 2012, Den, Update, Computers, c1ioo
|
c1ioo computer can not connect to the framebuilder and everything is red in the status for this machine, C1:FEC-33_CPU_METER is not moving.
EDIT by KI:
We rebooted the c1ioo machine, but none of the ftont end model came back. It looked like they failed |
|
Fri Apr 6 16:22:15 2012, Den, Update, Environment, seism box
|
I've changed R2 resistor in the seism box for the VERT 1 channel from 464 Ohm to 1051 Ohm to reduce the gain of this channel by a factor of 2. This should
help the GUR1Z signal not to be corrupted inside the AA box, so we can use it in the adaptive filtering. |
|
Fri Apr 6 15:06:05 2012, Den, Update, IOO, 1 Hz resonance
|
I think we can try to damp 1 Hz resonance more. In September it was not seen because of the digital noise. After we've figured it out, 1 Hz resonance
began to be more clear (blue line).
|
|
Fri Apr 6 11:32:09 2012, Jenne, Update, Computers, RAID array is rebuilding....
|
Suresh reported to Den, who reported to me (although no elogs were made.....) that something was funny with the FB. I went to look at it, and it's
actually the RAID array rebuilding itself. I have called in our guru, Jamie, to have a look-see. |
|
Fri Apr 6 14:39:21 2012, Jamie, Update, Computers, RAID array is rebuilding....
|
The RAID (JetStor SATA 416S) is indeed resyncing itself after a disk failure. There is a hot spare, so it's stable for the moment. But we
need a replacement disk:
RAID disks: 1000.2GB Hitachi HDT721010SLA360 |
|
Fri Apr 6 10:31:07 2012, Den, Update, Adaptive Filtering, static and adaptive
|
I've run static and adaptive filters simultaneously. AA32 filters rotate the phase of the witness signals GUR1X and GUR1Y and now the performance of
the static filter is worse. Next time I'll recalculate Wiener filter coefficients taking this into account. But still 2 filters together can deal with
a stack better. |
|
Fri Apr 6 11:14:34 2012, Jenne, Update, Adaptive Filtering, static and adaptive
|
Quote:
I've run static and adaptive filters simultaneously. AA32 filters rotate the phase of the witness signals GUR1X and GUR1Y and now the performance |
|
Fri Apr 6 09:57:24 2012, Den, Update, Adaptive Filtering, static starts to work 7x
|
I made static filter to work to evaluate the actuator TF.. Here is the result of static filtering:
|
|
Thu Apr 5 18:24:55 2012, Den, Configuration, Adaptive Filtering, oaf starts to work
|
Today I tried to make the lms filter to work online. I played around with the signals (GUR1_X and MC_F) to pre-whiten them and in the end the following
configuration worked out:
1. mu = 0.03, tau = 1e-5, downsample=8, nCoeff = 4000, delay = 5 (sample-and-hold delay is not included in the new code, it should be added |
|
Thu Apr 5 06:27:51 2012, kiwamu, Update, LSC, AS110 sideband monitor installed
|
[Jenne / Kiwamu]
We have installed a broad band PD in the AS path in order to monitor the 110 MHz signal associated |
|
Wed Apr 4 21:43:16 2012, Mike J., Update, Computers, Better Hysteresis Model
|
A better hysteresis model based on the simple harmonic oscillator equation. Useless variables have been removed and output can now be saved to workspace
for plotting. The model is at "/users/mjenson/matlab/SHO_hyst.mdl". |
|
Thu Mar 29 20:13:21 2012, jamie, Configuration, PEM, PEM_SLOW (i.e. seismic RMS) channels added to fb master
|
I've added the PEM_SLOW.ini file to the fb master file, which should give us the slow seismic RMS channels when the framebuilder is restarted. Example
channels:
[C1:PEM-RMS_ACC6_1_3]
[C1:PEM-RMS_GUR2Y_0p3_1]
[C1:PEM-RMS_STS1X_3_10]
etc.
I also updated the path to the other _SLOW.ini files. |
|
Wed Apr 4 13:25:29 2012, jamie, Configuration, PEM, PEM_SLOW (i.e. seismic RMS) channels aquiring
|
Quote:
I've added the PEM_SLOW.ini file to the fb master file, which should give us the slow seismic RMS channels when the framebuilder is restarted. |
|
Tue Apr 3 12:42:19 2012, Mike J., Update, Computers, Hysteresis Model
|
Here's my first hysteresis model in Simulink. It's based on the equation y=Amplitude*sin(frequency*t+phase)+(hysteresis/frequency2) as a solution
to y''+frequency2*y+hysteresis=0. All values in the model are variables that should be manipulated through the model workspace or external code. |
|
Mon Mar 26 23:47:54 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam
|
[Keiko, Suresh]
Keiko and I measured the IPPOS beam profile. The fit parameters are :
|
|
Tue Mar 27 02:05:40 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam
|
Quote:
[Keiko, Suresh] |
|
Tue Mar 27 11:54:18 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
I'd like to know what we expect for these numbers. I've added to Kiwamu's drawing some more distances, so I can calculate the expected beam size
at the IPPOS port.
|
|
Tue Mar 27 18:03:46 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
This is wrong! See following elog for corrected plot (and explanation)
I'm not done meditating on what's going on, but here's what I've got right now:
|
|
Tue Mar 27 21:20:32 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
Quote:
The moral of the story that I'm getting from this plot: something funny is going on. |
|
Tue Mar 27 23:37:35 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam
|
Quote:
|
|
Wed Mar 28 01:17:29 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
As I was a little dissatisfied with the inaccuracy in the distance numbers in Kiwamu's sketch, I went back to the 18 Dec 2010 table layout drawing for
more accurate numbers. These are now included in this round of plots.
Also, I include astigmatism due to the incident angles on MMT1 (~3.5 deg) and MMT2 (~1 deg). |
|
Wed Mar 28 18:26:47 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
More calculations....
Game Plan: Using MC waist measured beam as the starting point of beam propagation, move MMT mirrors around until the beam profile
fits with the IPPOS measurements from Monday. |
|
Wed Mar 28 20:54:02 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
I fitzed by hand with the numbers for the incident angles on MMT1 and MMT2, and then let the code optimize the position of MMT1 and MMT2.
Here I have set the incident angle for MMT1 = 25deg, and MMT2 = 12deg (should be 3.5deg, 1deg by design). The length of the telescope doesn't
want to change by more than 7mm, but the position of the telescope wants to change by 1.3meters. Is it possible that the distances on the Monday |
|
Mon Apr 2 18:58:32 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam
|
Suresh noted that I never wrote down the waist positions of the beam propagated through the MMT (based on where we think it is from ruler-based measurements).
This uses the MC waist measured beam as the starting point, and just propagates through the MMT, out to the IPPOS port.
Yq: |
|
Mon Apr 2 23:06:38 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam: Mystery deepens
|
Quote:
I fitzed by hand with the numbers for |
|
Tue Mar 27 17:19:02 2012, Koji, Update, IOO, Beam Profile measurement: IPPOS beam
|
The mode looks quite terrible in the plot, but in reality it is an illusion of the plot.
The actual TEM00 content in this beam is ~99.7%
mode_coupling.pdf |
|
Tue Mar 27 02:18:31 2012, keiko, Update, IOO, Beam Profile measurement: IPPOS beam
|
Keiko, Rana, Suresh
Related to the beam profile of IPPOS today, we tried to measure the beam size at the ETMY point in order to estimate the input beam mode. We measured
the beam size hitting at the suspension frame by a camera image, with two situations to see two "z" for beam profile. |
|
Tue Mar 27 16:06:59 2012, keiko, Update, IOO, Beam Profile measurement: IPPOS beam
|
I changed the ETMY CCD camera angle so that we can see the suspension frame in order to repeat the same thing as yesterday. The ETMY camera is not
looking at the beam or mirror right now. |
|
Sat Mar 31 08:01:07 2012, kiwamu, Update, LSC, DRMI measurement
|
I have measured the sensing matrix of the DRMI although the lock still doesn't stay for a long time.
As for the noise budget, it looks very tough as there are more glitches than that in the PRMI.
In this weekend I will take some more trials in the DRMI lock until I am satisfied. |
|
Thu Nov 17 15:19:06 2011, steve, Update, SUS, Ti spring plunger to hold OSEM is not affortable
|
Our existing 300 series SS plungers from McMastercar #8476A43 are silver plated as Atm2 shows.
Problems: 1, they become magnetized after years being close to the magnets
2, they oxidize by time |
|
Fri Jan 27 09:05:41 2012, steve, Update, SUS, OSEM locking plunger
|
Quote:
Our existing 300 series SS plungers from McMastercar #8476A43 are silver plated as Atm2 shows. |
|
Fri Mar 30 10:24:14 2012, steve, Update, SUS, new OSEM locking plunger
|
Quote:
|
|
Fri Mar 30 10:20:51 2012, kiwamu, Update, LSC, locking last night
|
I was trying to make the DRMI lock more robust.
Increasing the gains of the oplev on SRM helped a lot, but the lock is still not solid enough for measurements.
According to some line injection tests, the SRCL and MICH signals show up in AS55Q with almost the same amplitudes. |
|
Fri Mar 30 08:58:37 2012, steve, Update, SAFETY, Safety glasses checked
|
Bob cleaned all safety glasses in 10 % Liquinox soap in water solution first. The transmittance of glasses were checked at 100 mW 1064 nm
S polarization, beam diameter 0.5 mm at 0-20 deg incident.
Coherent FieldMate power meter measured T= < 1 mW of all glasses. |
|
Wed Mar 28 21:15:53 2012, rana, Omnistructure, Computers, Wireless router for GC
|
I installed a NETGEAR Wireless Router (WPN824N) today on the 131 network. The admin password for it as well as the wireless access password are in the
usual places.
The SSID is 40EARTH. I have set it to allow WPA as well as WPA2 access, so the speed is only 54 Mbps for now. In a year or so, we can turn off |
|
Thu Mar 29 13:23:05 2012, Jenne, Omnistructure, Computers, Wireless router for GC
|
Quote:
I installed a NETGEAR Wireless Router (WPN824N) today on the 131 network. The admin password for it as well as the wireless access password |
|
Thu Mar 29 19:13:56 2012, Jamie, Omnistructure, Computers, Wireless router for GC
|
I retrieved the newly "secured" router from Junaid. It had apparently been hooked up to the GC network via it's LAN port, but it's LAN
services had no been shut off. It was therefore offering a competing DHCP server, which will totally hose a network. A definite NONO.
The new SSID is "40mWiFi", it's WPA2, and the password is pasted to the bottom of the unit (the unit is back in it's original spot on |
|
Thu Mar 29 11:29:27 2012, keiko, Update, LSC, POP22/POP110 amplifires
|
Yesterday I and Kiwamu connected two amplifiers (mini-circuit, ZFL-1000LNB+) for POP22/110. Dataviewer can see some signals. I'll test the signal levels
and freq components before the rack just in case. [Kiwamu, Keiko] |
|
Thu Mar 29 18:42:11 2012, keiko, Update, LSC, POP22/POP110 amplifires
|
Adding two amplifiers on POP22/110, I checked the signals going to the dmod board of 22 and 110.
The signal flows: Photodetector of POP --> Amp1 --> Amp2 --> RF splotter --> bandpass filter for 22MHz / 110MHz --> 22MHz /
110MHz demod board. |
|
Tue Mar 27 21:37:51 2012, keiko, Configuration, IOO, Beam Profile measurement: IPPOS beam 9x
|
From the mode measurement I and Suresh have done yesterday, I calculated what beam size we expect at ETM ((1) upper Fig.1) and at ETM after
one bounce ((2) lower Fig.1).
|
|
Tue Mar 27 17:38:03 2012, Jenne, Update, IOO, Another possibility / thought
|
I'm meditating over the mode matching from the mode cleaner to the ITMs, and I had another thought:
Have we changed the pointing of the MC significantly enough that we are no longer on the center of the
MMT mirrors? To be this significant, we would probably also have had to scoot the Faraday a bit too, since it's skinny like a straw. |
|
Tue Mar 27 17:52:08 2012, Koji, Update, IOO, Another possibility / thought
|
It is quite likely that we touched the Faraday in Nov 2010.
In this entry http://nodus.ligo.caltech.edu:8080/40m/3874 I wrote that I removed the
MCT optics in the chamber. |
|
Fri Mar 23 01:59:59 2012, kiwamu, Update, IOO, REFL beam currently unavilable
|
[Suresh / Kiwamu]
Currently the REFL beam is bypassed by additional mirrors and blocked by a razor blade dump.
Therefore the signals associated with the REFL ports (e.g. REFL11, REFLDC and etc.) are unavailable. |
|
Tue Mar 27 02:46:28 2012, kiwamu, Update, IOO, REFL beam available
|
The dump and some temporary mirrors were removed and now the REFL beam is available again.
I locked PRMI with REFL signals, it locked as usual.
|
|
Fri Mar 23 05:10:46 2012, Suresh, Update, IOO, Beam Profile measurements: Errors too large to yield good fits.
|
[Kiwamu, Suresh]
Today we attempted to measure the beam profile of the REFL beam under two conditions:
(a) with PRM aligned and ITMs misaligned |
|
Mon Mar 26 15:15:16 2012, kiwamu, Update, IOO, expected beam profile of PRM reflection
|
I have estimated how the mode profile of the PRM reflection should be, as shown in the plot blow.
A conclusion here is :
we should be able to constrain the PRM curvature situation if measurements are precise and |
|
Mon Mar 26 16:25:44 2012, kiwamu, Update, IOO, expected v.s. measured beam profile of PRM reflection
|
[Suresh / Kiwamu]
We did the 2nd round of the PRM reflection mode scan on Friday.
It seems that the PRM curvature maybe correct if we look at the vertical mode, however but the horizontal |
|
Mon Mar 26 18:04:43 2012, kiwamu, Update, IOO, mode scan at the REFL port
|
For those who are interested in the actual data, I attache the actual data in zip file together with a python plot code.
The distance was set such that the 1st steering mirror (the one at the very left in the previous cartoon diagram #6445
) in the REFL path is positioned at zero. |
|
Mon Mar 26 12:50:24 2012, Zach, Update, elog, restarted with script
|
| On the plus side, it was the first time I've had to do it in a while.. |
|
Sat Sep 10 11:07:37 2011, rana, HowTo, SUS, Optical Lever Servo Tuning thoughts
|
Now that we are in a moderately stable condition,
its time to design the optical lever feedback transfer functions. We should think carefully about how to do this optimally.
In the past, the feedback shape was velocity damping from 0-10 Hz, with some additional resonant gain around the pendulum and stack modes. There |
|
Sun Mar 25 20:13:31 2012, rana, HowTo, SUS, Optical Lever Servo Tuning thoughts
|
To start the optical lever filter design, I looked into the noise on ITMY. It should be similar to the other arm cavity optics since they have the
same whitening electronics.
The RED/BLUE are with loops open. The MAGENTA/CYAN with loops closed. Looks good; the bandwidth is a few Hz and there is not much peaking, |
|
Wed Mar 21 10:31:28 2012, steve, Update, SAFETY, AC power to ETMY turned off
|
ETMY sus damping was disabled. Green locking laser and associated electronics turned off. Computers and power supplies turned off at rack 1Y4
The electricians picking up ac power from 1Y4 manual disconnect box and installing conduit line to ISCT-ETMY east end optical table.
There will be no more daisy chaining this way. |
|
Wed Mar 21 11:32:47 2012, steve, Update, SAFETY, AC power to ETMX turned off
|
Quote:
ETMY sus damping was disabled. Green locking laser and associated electronics turned off. Computers and power supplies |
|
Wed Mar 21 19:12:27 2012, steve, Update, Computers, AC power back on both ends
|
Quote:
|
|
Thu Mar 22 16:45:06 2012, kiwamu, Update, CDS, c1scx and c1scy not properly running
|
It seems that neither c1scx nor c1scy is working properly as their ADC counts are showing digital-zeros.
However the IOPs, c1gcx and c1gcy look running fine, and also the IOPs seem successfully recognizing the ADCs according to dmesg. |
|
Thu Mar 22 17:41:15 2012, suresh, Update, CDS, c1scx and c1scy not properly running
|
Quote:
It seems that neither c1scx nor c1scy is working properly as their ADC counts are showing digital-zeros. |
|
Thu Mar 22 23:43:56 2012, Koji, Update, CDS, c1scx and c1scy not properly running
|
Did you guys checked if the simplant switch is set to "REAL WORLD" mode?
Edit by KI:
Bingo ! The input signals were bypassed to the simplant. I switched the simplant settings to REAL WORLD |
|
Thu Mar 15 04:04:23 2012, Koji, Configuration, Locking, PRC Matching issues
|
Kiwamu and Koji
We found that the intra-cavity mode of the PRC is not round although it was obvious even with the DARK and REFL port images.
We need to review the mode matching situation. |
|
Thu Mar 22 17:35:59 2012, kiwamu, Update, Locking, mode profiles of the POP and POX beams : not bright enough
|
I tried to measure the beam profiles at the POP and POX ports as Koji mentioned in his entry (#6421).
However it turned out that the beam powers were too small to be measured with our beam scan at those ports.
So I will move on to measurements at the REFL port as Rana suggested because the laser power is much |
|
Wed Mar 14 10:06:26 2012, steve, Update, Green Locking, dichroic mirror quotes
|
Dichroic mirror quotes are in the wiki.
ATF is pricy.
We got a good price from Laseroptik, but the wedges are 5 arcminutes. The fused silica grade is 0F, meaning the homogeneity is 5 ppm instead |
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Thu Mar 22 08:14:21 2012, steve, Update, Green Locking, dichroic mirror quotes with large wedge
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Quote:
Dichroic mirror quotes are in the wiki. |
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Tue Mar 20 17:50:44 2012, Suresh, Update, Computers, Beam Scan machine fixed
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There was something wrong with the Beam Scan PC. The mouse and screen were not responding and the PC was asking for drivers for any new hardware
that we plugged in. We called in the services of Junaid and co. since we do not have a Win98 Second Edition installation disk in the lab.
Junaid came with the disk, we changed the screen and the mouse and installed everything. |
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Tue Mar 20 16:53:48 2012, steve, Update, PEM, cranes maintenance & certified inspection of 2012
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Fred Goodbar of Konecrane has completed the annual certified crane inspection and maintenance of our cranes as required in safety document.
They are in good working condition and safe to use. |
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Tue Mar 20 09:59:01 2012, steve, Update, IOO, Laser tripped off
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Today is janitor day. It still does not explain why the 2W Innolight tripped off about an hour ago. All back to normal.
.......................................................I asked Keven later, he admitted hitting the emergency shut off next to the chemical storage
cabinet. |
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Fri Mar 16 06:17:56 2012, Suresh, Update, Electronics, REFL165 calibration : measurements
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These are the measurements for estimating the amplitude of the signal recorded in the CDS when a known amount of modulated light is incident on
the photodiode. |
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Fri Mar 16 10:37:52 2012, Jenne, Update, Electronics, Jenne Laser
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Quote:
Here is a picture of the small black breadboard on which I have put together the PD characterisation setup. It would be great if we |
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Fri Mar 16 16:01:53 2012, rana, Update, Electronics, REFL165 calibration : measurements
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To characterize the RF V to counts we need to know the state of the whitening filter board. Was the filter on or off ? What was the value of the
whitening gain slider? |
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Mon Mar 19 21:25:31 2012, Suresh, Update, Electronics, REFL165 calibration : measurements
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Quote:
To characterize the RF V to counts we need to know the state of the whitening filter board. Was the filter |
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Sun Mar 18 00:29:24 2012, Den, Update, PEM, sts-2
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I've turned off the power of the STS-2 readout box as it provides outputs with ~10 Volts DC offset! AA filter box works in the range -2 +2 Volts, so
we do not have any useful information anyway. I'll adjust the mass positions in the seismometer. |