 Tue Aug 9 16:19:27 2016, Steve, Update, SUS, torque driver for wire clamp
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New Wiha 28504 torque
wrench for SOS wire clamping. It's range 7.5 - 20 in-lb in 0.5 steps [ 0.9 - 2.2 Nm ] Audible and perceptible click when the pre-set torque has
been attained at ±6% accuracy. |
 Thu Apr 23 15:40:41 2015, Steve, Update, General, torque for 1/4-20 
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Few 1/4 -20 socket cap head screw with washers were tested for optimum torque.
QJR 117E Snap On torque wrench was used. I found that 40 lb in was enough. |
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Fri Apr 24 18:13:36 2015, rana, Update, General, torque for 1/4-20
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For 1/4-20 bolts made of 18-8 Stainless Steel, the recommended torque varies from 65-100 inch-pounds, depending upon the application,
the lubrication, how loose the bolt is, if there's a washer, etc.
For our case, where we are going into a tapped, ferromagnetic stainless table, its less clear, but it will certainly by in the 60-80 range. This |
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Sat Mar 28 03:21:49 2015, den, Update, LSC, towards angular ff
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Tonight I measured seismic noise coupling to beam spot on PR2. There is coherence of 0.9 from X to PIT and Y to YAW around the stack resonances. TF was
fited using vectfit and put into static matrix of oaf in the elements T240X -> PRM PIT, T240Y -> PRM YAW. I think we should actuate on the error
point of the PRM OL but I decided not to go for a model change tonight. Data from seismometers and POP QPD was obtained during the UTC time 04:06:00 - |
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Fri Mar 21 09:02:03 2008, steve, Update, VAC, tp 2 failed
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Small turbo #2 is the forepump of the maglev.
It failed last night, shut down the maglev and interlock closed V1
Ifo pressure is 20 mTorr now. The Yarm was still locked at 8am this morning.
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Fri Mar 21 11:54:38 2008, rob, Update, VAC, tp 2 failed
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[quote]Small turbo #2 is the forepump of the maglev.
It failed last night, shut down the maglev and interlock closed V1
Ifo pressure is 20 mTorr now. The Yarm was still locked at 8am this morning.
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Thu Mar 20 15:28:20 2008, steve, Update, VAC, tp2 's drypump replaced
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| The fore pump of tp2 was replaced at fore line pressure 998m Torr |
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Fri Jan 9 16:52:18 2009, steve, Update, VAC, tp3 forline pump replaced
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Alberto took 40m vacuum 101 class as we replaced the drypump at the annulus pump line.
He is still not authorized to use the monster 2 3/8" open end wrench that is 36" long.
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Fri May 21 16:37:35 2010, steve, Configuration, VAC, tp3's drypump replaced
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| Bob replaced the tipseal in an other drypump and I swapped it in. TP3 turbo is running again, it's foreline pressure is 40 mTorr. The RGA is still off |
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Fri Oct 9 01:31:56 2009, rana, Configuration, DAQ, tpchn mystery
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Does anyone know if this master file is the real thing that's in use now? Are we really using a file
called tpchn_C1_new.par? If anyone sees Alex, please get to the bottom of this.
allegra:daq>pwd |
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Fri Oct 9 14:23:53 2009, Alex Ivanov, Configuration, DAQ, tpchn mystery
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"Yes. This master file is used."
Quote:
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Mon Nov 12 14:09:19 2007, rob, DAQ, General, tpman dead on fb40m
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The testpoint manager was dead on fb40m. I know I re-started it sometime after the power outage, so something must have killed it. If you get an error
from DTT like
"diagnostic kernel does not support: testpoints", then log into fb40m as root, check for the tpman with a [U][B]ps -ef | grep tpman[/B][/U]. If it's not |
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Sun Mar 22 23:16:41 2009, rana, DAQ, Computer Scripts / Programs, tpman restart
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Could get testpoints but couldn't start excitations. Restarted tpman on daqawg. Works now.
[COLOR=orange] Still no log file.[/COLOR] X-( |
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Wed Jan 7 14:16:27 2015, Jenne, Update, LSC, trans QPDs realigned
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Now that both end transmission QPDs have the line filters, I aligned them.
I locked and aligned the IR using the ASS, then went to each end table and put the beam in the center of the QPD. |
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Sun Jan 10 13:32:09 2010, Haixing, Update, SUS, transfer function measurement of the quadrant maglev circuit 6x
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I have assembled the circuit and the control box for the quadrant magnetic levitation yesterday. The final setup is shown
in the figure below:
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Sun Jan 10 15:47:26 2010, Koji, Update, SUS, transfer function measurement of the quadrant maglev circuit
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1. Why do all of the BNCs have no GND connection? Each should have the individual cables to the ground. Each signal line and the corresponding ground
line should be twisted together.
2. This looks the (usual) oscillation of the V-I conversion stage but I can't tell anything as I don't have the circuit diagram of the whole circuit. |
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Sun Jan 10 16:50:34 2010, Haixing, Update, SUS, transfer function measurement of the quadrant maglev circuit
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Quote:
1. Why do all of the BNCs have no GND connection? Each should have the individual cables to the ground. Each signal |
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Sun Jan 10 17:15:25 2010, Koji, Update, SUS, transfer function measurement of the quadrant maglev circuit
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1. Yes. That is the bad. You should eventually replace the BNCs to the isolated ones.
2. OK. I like to emphasize again that everyone works on electronics should read data sheets more carefully
and seriously because they have many important practical instructions to exploit full performance of the components. |
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Fri Feb 18 15:05:49 2011, kiwamu, Update, Green Locking, transfer function of angle to beat note (length)
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[Koji and Kiwamu]
We took transfer functions (TF) from the angle excitations at
ETMX and ITMX to the green beat note signal (i.e. angle to length TF). |
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Tue May 22 00:23:45 2012, Den, Update, CDS, transmission error monitor
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I've started to create channels and an medm screen to monitor the errors that occur during the transmission through the RFM model. The screen will show
the amount of lost data per second for each channel.
Not all channels are ready yet. For created channels, number of errors is 0, this is good. |
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Mon Sep 25 17:56:33 2017, johannes, Update, Computer Scripts / Programs, transmitted power during lossmap
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I had to do a reboot + burt restore of c1psl today. It was unresponsive and I couldn't get the PMC to lock. I also had to slightly realign the PMC,
and the IMC was too misaligned for the autolocker to catch lock. Adjusting it manually, it was predominantly MC1 PIT that was off. The YARM locked on a
10 mode and had to be aligned manually as well. |
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Sat Apr 21 21:10:34 2012, Jamie, Update, CDS, trend frame issue partially resolved
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Quote:
Unfortunately it looks like there may be a problem with trend data, though. If I try to retrieve 1 minute of "full data" |
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Tue Jan 29 15:16:18 2013, Manasa, Frogs, General, trial run
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I would like to suggest a trial run on these....Ergomates and the cleanboot! |
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Wed Jan 30 16:24:25 2013, Manasa, Frogs, General, trial run
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Quote:
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Fri Nov 5 14:06:19 2010, yuta, Update, IOO, tried to align MC by A2L measurement
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(Suresh, Kiwamu, Yuta)
Summary: |
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Thu Oct 14 01:09:17 2010, yuta, Update, IOO, tried to lock MC but failed
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(Rana, Koji, Kiwamu, Suresh, Yuta)
We attempted to lock the MC and finally got flashes of the MC,
but no luck. |
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Wed Jun 6 02:28:02 2012, yuta, Update, Green Locking, tried to see Yarm length change with weak beat note
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[Jenne, Yuta]
Summary: |
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Mon May 9 18:54:29 2011, kiwamu, Update, LSC, triggerd locking logic : screen prepared
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I made a new medm screen for the triggering logics. Have fun.
I put a button on C1LSC.adl to invoke this screen.
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Tue Jul 31 00:27:52 2012, Den, Update, PEM, trillium
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We have a Trillium for several days from Vladimir. I've put seismometer inside the foam box on linolium. I was not able to level the seismometer on granite
as this Trillium does not have level screws. Does anybody know where they are? Readout box stands on the foam box as seismometer cable is
short (~2 meters). |
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Fri Mar 6 13:48:17 2015, dark kiwamu, Summary, IOO, triple resonance circuit
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I was asked by Koji to point out where a schematic of the triple resonant circuit
is.
It seems that I had posted a schematic of what currently is installed (see elog 4562 from |
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Fri Feb 12 13:15:41 2010, kiwamu, Update, Electronics, triple resonant EOM --- liniaryity test
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I have measured the linearity of our triple resonant EOM (i.e. modulation
depth versus applied voltage)
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Sat Feb 13 13:21:53 2010, Koji, Update, Electronics, triple resonant EOM --- liniaryity test
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Looks good. I just thought of the idea that we also can use Alberto's PLL setup to sense the modulation with more sensitivity. ;-)
Quote:
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Wed Feb 10 17:28:02 2010, kiwamu, Update, Electronics, triple resonant EOM ---- preliminary result
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I have made a prototype circuit of the triple resonant EOM.
The attached is the measured optical response of the system.
The measured gains at the resonances are 8.6, 0.6 and 7.7 for 11MHz, 29.5MHz and 55MHz respectively. |
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Wed Feb 10 23:15:37 2010, Koji, Update, Electronics, triple resonant EOM ---- preliminary result
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Hey, this looks nice, but can you provide us the comparison of rad/V with the resonant EOM of New Focus?
Quote:
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Thu Feb 11 16:52:53 2010, kiwamu, Update, Electronics, triple resonant EOM ---- preliminary result
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The commercial resonant EOM of New Focus has the modulation efficiency of 50-150mrad/Vrms.
( This number is only true for those EOM made from KTP such as model4063
and model4463 |
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Sat Sep 3 14:47:50 2011, kiwamu, Update, IOO, triple resonant box : brief estimations about reflections and mode. depths
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(RF reflections)
The reflected RF power going back to the RF generation box will be :
Power at 11MHz = 2 dBm |
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Fri Sep 2 13:12:08 2011, kiwamu, Update, IOO, triple resonant box : ready to install
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The triple resonant box was checked again. Each resonant frequency was tuned
and the box is ready to go.
Before the actual installation I want to hear opinions about RF reflections |
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Fri Sep 2 15:56:32 2011, Koji, Update, IOO, triple resonant box : ready to install
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What are the reflected RF powers for those frequencies?
Is the 29.5MHz more problem than the 55MHz, considering the required modulation depth?
|
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Mon Jan 18 23:44:19 2010, kiwamu, Update, Electronics, triple resonant circuit for EOM
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The first design of the triple resonant EOM circuit has been done.
If only EOM has a loss of 4 Ohm, the gain of the circuit is expected
to be 11 at 55MHz |
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Tue Jan 19 00:10:44 2010, rana, Update, Electronics, triple resonant circuit for EOM
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Very cool.
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Tue Jan 19 02:40:38 2010, Koji, Update, Electronics, triple resonant circuit for EOM
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The design looks very good. I have some questions.
1. As far as I remember, you've got the gain of slightly worse than 10 for a 55MHz single resonant case. Why your expectation of the gain (G=11)
for the highest resonance better than this? |
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Tue Jan 19 03:04:14 2010, Koji, Update, Electronics, triple resonant circuit for EOM
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Self-follow:
I got the answer of Q3 from the follow-up entry.
For Q4, once you get the impedance of the LC network lower than n^2*50, the EOM gain will be quite low. This means that the resonance is anyway |
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Tue Aug 24 11:23:32 2010, steve, Update, PEM, tripod leg installation completed 7x
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Bertine Robby, Bertin and Jerry completed the installation by pouring concrete yesterday and cleaning up today.
Atm1-2, steel bars, grouted feet and side forms are ready
Atm3, bounding agent is applied for better bounding |
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Wed Jan 16 14:09:45 2008, rob, Update, LSC, tuesday's locking
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I got a little further with the locking (PRFPMI) last night, after discovering that the cable going from the CM board to the MC board was unplugged at
the MC side. This explains why we weren't able to engage the AO path last night. Tonight, I got up to the point where DARM is handed off to OMC transmission, |
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Thu Apr 9 12:23:49 2009, pete, Update, Locking, tuning ETM common mode
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Pete, Yoichi
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 |
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Tue Jul 25 14:04:06 2017, Steve, Update, VAC, turbo controller installed and we are running at vac normal
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Gautam and Steve,
Spare Varian turbo-V 70 controller, Model 969-9505, sn 21612 was swapped in. It is running the turbo fine @ 50Krpm but it does not allow it's
V4 valve to be opened............ |
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Wed Mar 30 16:57:13 2011, kiwamu, Update, General, turned off c1aux
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[Steve / Kiwamu]
As a part of the video cable session, we reconnected some power cords on 1Y1 rack.
During the work we momentarily turned off c1aux, which handles DMF, Illumintators, mechanical shutters and the old video epics. |
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Tue Jan 5 13:23:45 2010, Alberto, Omnistructure, Environment, turning page
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In the lab there are lots of old posters with outdated autocad drawings, or printouts with schematics of old electronics hanging on the walls.
Can we get rid of those and start giving the lab a fresh and modern look? |
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Mon Jan 28 21:32:38 2013, jamie, Update, Alignment, tweaking of alignment into half PRC
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[Koji, Jamie]
We tweaked up the alignment of the half PRC a bit. Koji started by looking at the REFL and POP DC powers as a function of TT2 and PRM alignment.
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Wed Mar 24 04:22:51 2010, kiwamu, matt, Update, Green Locking, two NPRO PLL
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Now some pedestals, mirrors and lenses are left on the PSL table, since we are on the middle way to construct a PLL setup which employs two NPROs instead
of use of PSL laser.
So Please Don't steal any of them. |