 Sat Jun 23 18:44:15 2012, steve, Update, General, power surge has no effect on the lab
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I was notified by CIT Utilities that there was a power surge or short power outage this after noon.
Lab conditions are normal: c1ioo is down. The south arm AC was off......I turned it back on. |
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Mon Aug 6 09:46:31 2012, steve, Update, IOO, poweroutage turns laser off
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. Power outage turned off the PSL Innolight laser on Sunday afternoon. It was turned back on and
locked happily right on. The green lasers were not effected. |
Sat Dec 8 04:12:38 2012, Den, Update, LSC, prcl 
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Today I wanted to check that AS and REFL beams are real and contain proper information about interferometer. For this I locked YARM using AS55_I
and REFL11_I. Then I compared spectrum with POY11_I locking. Everything is the same. I've also adjusted phase rotations of AS55 (0.2 ->24) and REFL11
(-34.150 -> -43). |
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Fri Apr 12 02:56:34 2013, Den, Update, Locking, prcl angular motion
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I compared PCRL and XARM angular motions by misaligning the cavities and measuring power RIN. Divergence angles for both cavities I calculated to be
100 urad.
XARM pointing noise sums from input steering TTs, PR2 and PR3 TTs, BS, ITMX, ETMY. |
 Fri Apr 12 09:20:32 2013, rana, Update, Locking, prcl angular motion
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| How is the cavity g-factor accounted for in this calculation? |
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Fri Apr 12 13:21:34 2013, Den, Update, Locking, prcl angular motion
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Quote:
How is the cavity g-factor accounted for in this calculation? |
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Sat Apr 13 03:45:51 2013, rana, Update, Locking, prcl angular motion
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Maybe its equivalent, but I would have assumed that the input beam is fixed and then calculate the cavity axis rotation and translation.
If its small, then the modal expansion is OK. Otherwise, the overlap integral can be used. |
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Sat Apr 13 23:11:04 2013, Den, Update, Locking, prcl angular motion
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Quote:
For the PRM, it is also a mostly translation effect as calculated at the PRC waist position (ITM face). |
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Sun Apr 14 17:56:03 2013, rana, Update, Locking, prcl angular motion
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Quote:
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Mon May 13 18:44:04 2013, Jenne, Update, Locking, prcl angular motion
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I want to redo this estimate of where RIN comes from, since Den did this measurement before I put the lens in front of the POP PD.
While thinking about his method of estimating the PR3 effect, I realized that we have measured numbers for the pendulum frequencies of the recycling
cavity tip tilt suspensions. |
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Wed Feb 6 10:07:23 2019, Chub, Update, , pre-construction inspection
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The Central Plant building will be undergoing seismic upgrades in the near future. The adjoining north wall along the Y arm will be the first to
have this work done, from inside the Central Plant. Project manager Eugene Kim has explained the work to me and also noted our concerns. He
assured me that the seismic noise from the construction will be minimized and we will always be contacted when the heaviest construction is to be done. |
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Fri Sep 30 19:12:56 2011, Koji, Update, General, prep for poweroutage
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[Koji Jenne]
The lasers were shutdown |
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Tue Oct 17 17:53:25 2017, jamie, Summary, LSC, prep for tests of Gabriele's neural network cavity length reconstruction
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I've been preparing for testing Gabriele's deep neural network MICH/PRCL reconstruction. No changes to the front end have been made yet, this is all just prep/testing work.
Background:
We have been unable to get Gabriele's nn.c code running in kernel space for reasons unknown |
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Wed Oct 18 12:14:08 2017, jamie, Summary, LSC, prep for tests of Gabriele's neural network cavity length reconstruction
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Quote:
I tried a manual test
of the new user space model. Since this is a user space process running it should have no affect on the rest of the front end system (which it didn't): |
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Fri Jun 29 02:17:40 2012, yuta, Update, IOO, prep for the vent - beam attenuating
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[Koji, Jamie, Yuta]
We attenuated the incident beam (1.2 W -> 11 mW) to the vacuum chamber to be ready for the vent. |
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Fri Jun 29 03:21:32 2012, yuta, Update, General, prep for the vent - others
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1. Turned off high voltage power supplies for PZT1/2 (input PZTs) and OMC stage 1/2. They live in 1Y3 rack and AUX_OMC_NORTH rack.
2. Restored all IFO optics alignment to the position where I aligned this afternoon (for SRM, I didn't aligned it; it restored at the saved value |
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Tue Jun 26 20:59:36 2018, aaron, Update, OMC, prep for vent in a couple weeks
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I checked out the elog from the vent in October 2016 when the OMC was removed from the path. In the vent in a couple weeks, we'd like to get the
beam going through the OMC again. I wasn't really there for this last vent and don't have a great sense for how things go at the 40m, but this
is how I think the procedure for this work should approximately go. The main points are that we'll need to slightly translate and rotate OM5, rotate |
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Wed Apr 27 18:14:48 2011, kiwamu, Update, LSC, preparation for DRMI locking : RF status
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POX11 (see this entry) is now listed as REFL11 (on the very top row). |
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Fri Feb 26 15:32:13 2010, steve, Configuration, VAC, preparation for power outage: vacuum all off
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There is a planned power outage tomorrow, Saturday from 7am till midnight.
I vented all annulies and switched to ALL OFF configuration. The small region of the RGA is still under vacuum.
The vac-rack: gauges, c1vac1 and UPS turned off. |
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Wed May 2 10:03:58 2018, Steve, HowTo, SEI, preparation of load cell measurement at ETMX 6x
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Gautam and Steve,
We have calibrated the load cells. The support beams height monitoring is almost ready.
The danger of this measurment that the beams height changes can put shear |
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Thu May 3 09:56:42 2018, Steve, HowTo, SEI, preparation of load cell measurement at ETMX
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[ Dennis Coyne' precision answer ]
Differential Height between Isolators |
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Mon May 14 08:55:40 2018, Dennis Coyne, HowTo, SEI, preparation of load cell measurement at ETMX
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follow up email from Dennis 5-13-2018.
The last line agrees with the numbers in elog13821.
Hi Steve & Gautam, |
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Tue Aug 2 02:35:23 2011, kiwamu, Update, General, preparation of the vent : status and plan
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The vent will take place on Wednesday.
Plan for Tuesday :
(Morning) Preparation of necessary items for the low power MC (Steve / Jamie) |
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Sun Jul 31 22:48:35 2011, kiwamu, Summary, General, preparation of the vent : status update
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Status update for the vent preparation:
The punchline is : We can not open the chamber on Monday !
|
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Mon Aug 1 08:52:37 2011, steve, Update, VAC, preparation to vent
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| Both arms locked easely around 1V transmited. We should recenter oplevs. |
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Wed Apr 7 09:00:01 2010, steve, HowTo, PEM, prepare to open chamber
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In order to minimize the diffusion of more dust particles into the vented IFO vacuum envelope
BEFORE opening chamber:
-Have a known plan, |
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Fri Nov 18 16:37:14 2011, steve, Update, VAC, preparing for ac power interruption
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The vacuum is ready for no AC power for 1 hr on Sunday morning at 10am
I did the follwing: |
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Mon Sep 8 08:24:49 2014, Steve, Update, Computer Scripts / Programs, preparing vac system to reboot
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| Q and Steve will follow elog 10028 entry to prepare the vacuum system for safe reboot |
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Mon Sep 8 11:10:26 2014, ericq, Update, Computer Scripts / Programs, preparing vac system to reboot
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Quote:
Q and Steve will follow elog 10028 entry to prepare the vacuum system for safe |
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Mon Sep 8 11:34:47 2014, rana, Update, Computer Scripts / Programs, preparing vac system to reboot
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FYI: in that rack, the +15V pulls ~0.5 A more than -15V usually. I think this is due to some RF amplifiers which are powered by this (e.g. the AOM that
Manasa set up). The Sorensen's can source ~30A in principle, so we should make sure to set the current limit appropriately so as to not overheat them when
there is a short. |
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Mon Sep 8 12:11:36 2014, manasa, Update, Computer Scripts / Programs, preparing vac system to reboot
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Quote:
FYI: in that rack, the +15V pulls ~0.5 A more than -15V usually. I think this is due to some RF amplifiers which are powered by this (e.g. |
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Tue Sep 9 14:18:40 2014, Steve, Update, Computer Scripts / Programs, preparing vac system to reboot
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Quote:
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Tue Jun 30 11:33:00 2015, Jamie, Summary, CDS, prepping for CDS upgrade
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This is going to be a big one. We're at version 2.5 and we're going to go to 2.9.3.
elog for last upgrade to RCG 2.5 (6540)
DAQ
setup/install (T1500227)
RCG 2.6 release notes (awiki)
RCG |
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Mon Apr 25 22:38:49 2011, kiwamu, Update, LSC, prepration for DRMI : Y arm flashing
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This week is going to be a recycled Michelson week.
As
a preparation I did several things today :
1. Alignment of the Y arm
2. Alignment of PRM
3. Checking
of all the pick-off ports
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Fri Oct 12 17:37:03 2018, Steve, Update, VAC, pressure gauge choices
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We want to measure the pressure gradient in the 40m IFO
Our old MKS cold cathodes are out of order. The existing working gauge at the pumpspool
is InstruTech CCM501 |
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Fri Jul 22 10:24:34 2011, steve, Update, VAC, pressure plot at day 213
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| Dec 21, 2010 we pumped down the MARK4 rebuilt 40m-IFO and the malev has been pumping on it since than |
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Mon Oct 31 08:55:19 2011, steve, Update, VAC, pressure plot at day 53
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Quote:
I was lucky to notice that the nitrogen supply line to the vacuum valves was leaking. Closed ALL valves. Open supply |
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Thu Aug 10 14:14:17 2017, Kira, Update, PEM, previously built temp sensor
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I decided to see what was inside the sensor that had been previously made. According to elog 1102, the temperature sensor is LM34, the specs of which
can be found here:
http://www.ti.com/lit/ds/symlink/lm34.pdf |
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Mon Nov 14 21:22:48 2011, rana, Configuration, Computers, primetime RSYNC slowing down NODUS
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nodus:elog>w; who ; date
9:20pm up 44 day(s), 5:14, 5 users, load average: 0.29, 1.04, 1.35
User tty login@ idle JCPU PCPU |
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Thu Nov 4 17:53:29 2010, yuta, Update, CDS, primitive python script for A2L measurement
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Summary:
I wrote a python script for A2L measurement.
Currently it is really primitive, but I tested the basic functionality of the script. |
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Wed Aug 24 11:40:21 2011, jamie, jenne, kiwamu, suresh, steve, Update, SUS, problem with ITMX
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ITMX was drag wiped, and the suspension was put back into place. However, after removing all of the earthquake stops we found that the suspension
was hanging in a very strange way.
The optic appears to heavily pitched forward in the suspension. All of the rear face magnets are high in their OSEMs, while the SIDE OSEM |
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Thu Dec 20 12:14:19 2012, Jamie, Update, General, problem with in-vac wiring for TTs
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Nic and I discovered a problem with the in-vac wiring from the feed-thru to the top of the table. Pin 13 at the top of the stack, which is one
of the coil pins on the tip-tilt quadrapus cables, is *the* shield braid on the cable that goes to the feed-thru. This effectively shorts one of
our coil signals. |
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Tue Sep 4 20:20:47 2012, jamie, Update, General, problematic tip-tilts
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Quote:
We clearly need a better plan for adjusting the tip tilts in pitch, because utilizing their hysteresis |
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Mon Sep 28 17:39:34 2009, rob, Update, PSL, problems
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The PSL/IOO combo has not been behaving responsibly recently.
The first attachment is a 15 day trend of the MZ REFL, ISS INMON, and MC REFL power. These show two separate problems--recurring MZ flakiness,
which may actually be a loose cable somewhere which makes the servo disengage. Such disengagement is not as obvious with the MZ as it is with other |
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Tue May 29 00:53:57 2012, Den, Update, CDS, problems
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I've noticed several CDS problems:
Communication sign on C1SUS model turns to red once in a while. I press diag reset and it is gone. But after some time comes back.
On C1LSC machine red "U" lamp shines with a period ~5 sec.
I was not able to read data from the SR785 using netgpibdata.py. |
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Sun Apr 26 00:56:21 2015, rana, Summary, Computer Scripts / Programs, problems with new restart procedures for elogd and apache
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Since the nodus upgrade, Eric/Diego changed the old csh restart procedures to be more UNIX standard. The instructions are in the wiki.
After doing some software updates on nodus today, apache and elogd didn't come back OK. Maybe because of some race condition, elog tried
to start but didn't get apache. Apache couldn't start because it found that someone was already binding the ELOGD port. So I killed ELOGD several |
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Fri May 1 20:33:31 2015, rana, Summary, Computer Scripts / Programs, problems with new restart procedures for elogd and apache
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Same thing again today. So I renamed the /etc/init/elog.conf so that it doesn't keep respawning bootlessly. Until then restart elog using the start script in /cvs/cds/caltech/elog/
as usual. |
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Tue Jul 12 13:59:12 2022, rana, Summary, Computers, process monitoring: Monit
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I've installed Monit on megatron and nodus just now, and will set it up to monitor some of our common processes.
I'm hoping that it can give us a nice web view of what's running where in the Martian network. |
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Tue Mar 3 11:38:11 2015, Steve, Update, safety, professional crane inspection
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Quote:
Safety glasses were measured |
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Wed Mar 2 10:09:28 2016, Steve, Update, safety, professional crane inspection
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The crane inspection is scheduled for this coming Friday from 8-12
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