 Mon Mar 18 13:10:19 2013, Koji, Bureaucracy, Auxiliary locking, Yend table upgrade - go fetch NPRO from ATF
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1) Annalisa is going to start working on mode profiling and beat note search for the old MOPA NPRO.
2) In the meantime, Manasa is working on the end table items. This will be reviewed by KA in the afternoon.
The laser at ATF is moved to the 40m when the status of 1) and 2) is determined by KA to be reasonable. |
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Mon Mar 18 20:13:18 2013, Annalisa, Bureaucracy, Auxiliary locking, Yend table upgrade - go fetch NPRO from ATF
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Quote:
1) Annalisa is going to start working on mode profiling and beat note search for the old MOPA NPRO. |
Wed Mar 20 16:45:59 2013, Manasa, Bureaucracy, Auxiliary locking, Fetched NPRO from ATF 
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[Koji, Annalisa, Manasa]
NPRO with controller from ATF joins the 40m. We have put it on the POY table where we plan to use it for ABSL. |
 Thu Jul 31 21:59:25 2014, Koji, Bureaucracy, General, Ants
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Don't leave your food on tables and desks!
Also I put the souvenir chocolates in the microwave,
just in case. |
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Wed Mar 4 00:50:36 2015, rana, Bureaucracy, Treasure, Transitioned DARM to AS55Q, some other work
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Just in case there was some confusion, the champagne on my desk is not to be opened
before I get back, no matter how many signals are transitioned to RF. |
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Fri Jun 5 11:59:59 2015, ericq, Bureaucracy, General, Maintenance Tasks, IFO upgrades
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At wednesday's meeting, Rana, Koji, Steve, and I started making a list of maintenence tasks that should be done/checked
on a regular basis. The actual scheduling of these has not yet been considered. They include:
N2 Tank pressure / cylinder replacement
Headlamp, |
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Tue Feb 14 10:43:06 2017, gautam, Bureaucracy, Equipment loan, Equipment to Cryo Lab
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PZT
Buzzer Box (Thorlabs HV Supply + Manual + 2*PZT Buzzers) ---> Cryo Lab (Brittany + Aaron) |
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Tue Mar 7 15:17:19 2017, Steve, Bureaucracy, General, property tag
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| Property tag found. |
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Tue Nov 28 17:27:57 2017, awade, Bureaucracy, Calibration-Repair, SR560 return, still not charging
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I brought a bunch of SR560s over for repair from Bridge labs. This unit, picture attached (SN 49698), appears to still not be retaining charge.
I’ve brought it back. |
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Wed Jun 6 17:22:23 2018, Koji, Bureaucracy, General, Salvaged junk from yend
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While Keerthana and johannes were working at the end, I made a little cleaning at the yend. I salvaged large amount of hardware inclding optics, optomechanics.
We all together should work on returning them to appropriate locations. |
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Tue Jun 12 14:47:37 2018, gautam, Bureaucracy, General, Unlabelled components from EX moved to SP table and labelled
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Steve mentioned two unlabelled optics were found at EX, relics from the Endtable upgrade.
One was a 1" 45 deg p-pol optic (Y1-1025-C-45P),
it looks a bit scratched.
The other was a Beam Sampler (BSF10-C).
These |
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Tue Jun 12 15:32:15 2018, Steve, Bureaucracy, General, Salvaged junk from Xend
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Koji's collection of Yend components put away. I cleaned up the Xend bench today.
Loadcells, leveling wedge mounts and related items placed under flowbench cabinet next to Guralp staff.
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Fri Jun 15 08:09:15 2018, Steve, Bureaucracy, General, cleaning up at the PSL enclousure
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| The cabeling was cleaned up a little bit yesterday morning. The upper back side is still massy. |
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Mon Aug 20 14:04:53 2018, johannes, Bureaucracy, Equipment loan, Two C30642G PDs removed
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EDIT: After discussing with Koji and checking the existing M2ISS PDs I put the two C30642G back and took two C30665GH (active diameter: 3mm)
diodes. Only one of this type remains in storage.
I removed two C30642G photodiodes from the stash for the new M2ISS hardware and updated the wiki |
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Tue Aug 21 17:32:51 2018, awade, Bureaucracy, Equipment loan, One P-810.10 Piezo Actuators element removed
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I've taken a PI Piezo Actuator (P-810.10)
from the 40m collection. I forgot to note it on the equipment checklist by the door, will do so when I next drop by. |
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Fri Apr 19 09:42:18 2019, Koji, Bureaucracy, General, Item borrowing (40m->OMC)
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Apr 16, 2019
Borrowed two laser goggles from the 40m. (Returned Apr 29, 2019)
Apr 19, 2019 |
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Fri Apr 19 12:06:31 2019, awade, Bureaucracy, Electronics, Borrowed Busby Box May 19th 2019
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I've borrowed the Busby Box for a day or so. Location: QIL lab at Bridge West.
Edit Sat Apr 20 21:16:46 2019 (awade): returned. |
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Wed Apr 24 11:22:59 2019, awade, Bureaucracy, Equipment loan, Borrowed Zurich HF2LI Lock in Amplifer to QIL
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| Borrowed Zurich HF2LI Lock in Amplifer to QIL lab Wed Apr 24 11:25:11 2019. |
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Thu Aug 1 13:55:34 2019, Duo, Bureaucracy, Equipment loan, Gpib module taken to QIL lab
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vanna --> QIL.
gautam 20190804: The GPIB module + power supply were returned to me by Duo ~5pm today at the 40m. |
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Fri Aug 28 11:41:23 2020, gautam, Bureaucracy, safety, Crane inspection 2020
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Mr Fred Goodbar of Konacrane was in the lab 830am-1130am today. All three cranes in the VEA were inspected, loaded with 450lb test weights, and declared in good working condition and safe to use.
Apparently, the clackity noise heard when running the crane at the south end is a known problem - the crane was opened up and inspected |
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Tue Mar 15 13:49:44 2022, Ian MacMillan, Bureaucracy, Treasure, New Screwdriver Bits
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I have received the new screwdriver bits that will work with the two electric screwdrivers we have. I have distributed them in the 40m. Some are in the
electronics stations and some are in the toolbox in the lab. The new electric screwdriver (which looks like a drill but takes typical screwdriver bits)
is in the room with the workshop. It is in the blue Makita box. For some reason, lots of the old bits were rounded because of incorrect use. I have thrown |
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Wed Aug 10 19:36:45 2022, Koji, Bureaucracy, General, Lab cleaning and discovery
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During the cleaning today, we found many legacy lab items. Here are some policies what should be kept / what should be disposed
Dispose
VME crates and VME electronics as long as they are not in use
Eurocard SUS modules that are not in use.
Eurocard |
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Wed Aug 17 07:35:48 2022, yuta, Bureaucracy, General, My wish list for IFO commissioning
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FPMI related
- Better suspension damping HIGH
- Investigate ITMX input matrix diagonalization (40m/16931) |
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Thu Jul 13 14:47:38 2023, yuta, Bureaucracy, General, Things we need to fix
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ETMX damping loops are not good. ETMX is moving by ~10 urad (if oplev is correctly calibrated), and beam spot moves by ~0.5 beam spot on ETMX
when Xarm is locked. TRX fluctuates by ~10%. Simply tuning gains did not solve.
ETMX does not come back after putting some offset to misalign
and remove the offset to align. Hysterisis makes me hysteric.
Xend acromag is removed, and we cannot access Xend shutter and ETMX slow channels.
XARM |
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Wed Oct 17 18:46:33 2007, rana, Configuration, General, eLog Change
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This is the first entry in the [U]new[/U] 40m eLog.
Its [B]GWs[/B] or bust now! :D
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Fri Oct 26 21:48:40 2007, waldman, Configuration, OMC, Fiber to 056
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I set up a 700 mW NPRO in Rana's lab and launched it onto a 50m fiber. I got a few mW onto the fiber, enough to see with a card before disabling the laser.
The fiber now runs along the hallway and terminates in rm 056. Its taped down everywhere someone might trip on it, but don't go out of your way to
trip on it or pull on it because you are curious. Tomorrow I will co-run a BNC cable and attenuate the NPRO output so it can only send a few mW and so |
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Sat Oct 27 19:00:44 2007, waldman, Configuration, OMC, Hanging, locked OMC with REFL extracted.
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I got the OMC locked to the fiber output today. It was much more difficult than I expected and I spent about 30 minutes or so flailing before stopping
to think. The basic problem is that the initial alignment is a search in 4-dimensional space and there is naturally only one signal, the reflected DC
level, to guide the alignment. I tried to eyeball the alignment using the IR card and "centering" the beams on mirrors, but I couldn't get close enough |
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Sun Oct 28 03:03:42 2007, rana, Configuration, IOO, Three Way Excitement
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[SIZE=2][B]We've been trying to measure the MC mirror internal mode frequencies so that we can measure
their absorption before and after drag wiping.[/B][/SIZE]
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Mon Oct 29 12:20:15 2007, waldman, Configuration, OMC, Changed OMS filters
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I changed the OMS configuration so that some of the OMC-SUS LED channels go to a breakout box so that we can input the PDH error signal. After lunch,
we will try to lock the cavity with a PDH error signal and digital filters. Then its on to dither locked stuff. Note that this LED business will have
to be changed back some day. For now, it should be extremely visible because there are dangling cables and a hack job interface lying around. |
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Mon Oct 29 23:10:05 2007, waldman, Configuration, OMC, Lost in DAQspace
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[Pinkesh, Sam]
In setting up a Digital based control of the hanging OMC, we naively connect the Anti-Imaging filter output to an Anti-Aliasing input. This led to no |
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Tue Oct 30 13:58:07 2007, ajw, Configuration, IOO, MC Ringdowns
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Here's a quick fit-by-eye to the latter part of the data from tek00000.xls.
The prediction (blue) is eqn 41 of
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Wed Oct 31 15:22:59 2007, rob, Configuration, IOO, Mode Cleaner transfer function
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I measured the transfer function of the input mode cleaner using a PDA255 and the ISS. First I put the PD in front of the ISS out-of-loop monitor diode
and used an SR785 to measure the swept sine transfer function from the Analog IN port of the ISS to the intensity at the PD. Then I moved the PD to detect
the light leaking out from behind MC2, using ND filters to get the same DC voltage, and measured the same transfer function. Dividing these two transfer |
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Thu Nov 1 11:45:30 2007, tobin, Configuration, IOO, Mode cleaner drag-wiping
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Andrey, Bob, David, John Miller, Rana, Rob, Steve, Tobin
Yesterday we vented the vacuum enclosure and opened up the chamber containing MC1 & MC3 by removing the access connector between that chamber and the OMC |
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Tue Nov 6 10:42:01 2007, rob, Configuration, IOO, mode cleaner locked
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Increased the power exiting the PSL by turning the half-wave plate after the MOPA, opened the PSL shutter, and aligned the mode cleaner to the input beam.
It wasn't that hard to find the beam with the aperture open all the way on the MC2 camera. The transmitted power is now 2.9 arbitrary units, while the
input power is 1.2 arbitrary units. Not sure yet if that's an increase or decrease in efficiency, since no one posted numbers before the vent. Also turned |
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Tue Nov 6 15:37:34 2007, rob, Configuration, SUS, rampdown script
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/cvs/cds/caltech/scripts/SUS/rampdown.pl is now in the crontab for op340m, running every half-hour at 15&45. It checks the suspension watchdog trip levels,
and reduces them by 20 if they are above 150. |
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Tue Nov 6 16:48:54 2007, tobin, Configuration, Computers, scopes on the net
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I configured our two 100 MHz Tektronix 3014B scopes with IP addresses: 131.215.113.24 ([url=http://scope0/]scope0[/url]) and 113.215.113.25 ([url=http://scope1/]scope1[/url]).
Let the scripting commence!
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Tue Nov 6 18:18:15 2007, tobin, Configuration, Computers, I broke (and fixed) conlogger
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It turns out that not only restart_conlogger, but also conlogger itself checks to see that it is running on the right machine. I had [url=http://dziban.ligo.caltech.edu:40/40m/32]changed
the restart_conlogger script[/url] to run on op340, but it would actually silently fail (because we cleverly redirect conlogger's output to /dev/null).
Anyway, it's fixed now: I edited the conlogger source code where the hostname is hardcoded (blech!) and recompiled.
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Tue Nov 6 23:45:38 2007, tobin, Configuration, Computers, tektronix scripts!
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I cooked up a little script to fetch the data from the networked Tektronix scope. Example usage:
[FONT=Courier]linux2:scripts>[b]tektronix/tek-dump scope0 ch1 foo.csv[/b][/FONT]
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Wed Nov 7 00:51:33 2007, andrey, rob, tobin, Configuration, IOO, MC ringdowns
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| We completed several ringdown measurements this afternoon; Andrey is currently processing the data. |
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Wed Nov 7 10:55:21 2007, ajw, Configuration, Computers, backup script restarted
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Following the reboot of computers on 10/31/07, the backup script required restart (which unfortunately "can't" be automated because a password needs to
be typed in). I restarted, following the instructions in /cvs/cds/caltech/scripts/backup/000README.txt and verified that it more-or-less worked last night
(the rsync sometimes times out; it gets through after a couple of days of trying.) |
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Wed Nov 7 13:54:44 2007, rob, Configuration, IOO, Mode Cleaner transfer function
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I performed the same procedure described [url=http://dziban.ligo.caltech.edu:40/40m/40] here[/url], and re-measured the transfer function of the mode cleaner
to see the effect of the drag-wiping. The results are attached in a pdf. We don't seem to have done any damage, but the improvements are barely measurable.
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Wed Nov 7 14:05:59 2007, tobin, Configuration, IOO, MC ringdown
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Modeling the mode cleaner as a simple cavity with all losses lumped together, we expect the cavity power to be
attenuated by a factor (1-L) after each interval (2l/c)=1/fsr. Therefore we can get the cavity loss L
(including power lost through transmission) from the ringdown time constant tau as:
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Thu Nov 8 15:57:53 2007, tobin, Configuration, PSL, shelf removed
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I removed the sheet metal shelf from the PSL enclosure, for easier access to the ISS.
ISS investigations ongoing. |
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Thu Nov 8 18:44:01 2007, tobin, Configuration, PSL, ISS
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Tobin, Rob
With the Sense PD blocked, I adjusted the offset trim of the fourth stage in the ISS servo until the current shunt signal was zeroed. After this adjustment, |
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Fri Nov 9 17:33:33 2007, rob, Configuration, PSL, ISS
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The 3.7 MHz is actually on the light. It's the beat between the 29.5 MHz sidebands and the 33.2 MHz sidebands. There are pads in the ISS PCB for a filter
to notch this frequency--John is working on it.
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Fri Nov 9 21:36:14 2007, rob, Configuration, PSL, FSS
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rob, rana
We looked at the FSS a bit today. The most we could get out of it with the gain sliders was a UGF of around 95kHz. After a bit of tweaking the waveplate |
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Mon Nov 12 15:05:49 2007, rob, Configuration, PSL, FSS
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Spent a bit of time fiddling with the FSS again today. In a not-particularly-systematic manner, I raised the input-side of the 21.5MHz PC, adjusted the
half-wave plate in front of it, touched up the RC alignment and the alignment onto the transmitted and reflected diodes. This got us a ~15% increase in |
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Tue Nov 20 13:06:57 2007, tobin, Configuration, Computers, linux1 has new disk
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Alex put the new hard disk into linux1 along with a fresh install of linux (CentOS). The old disk was too damaged to copy.
Alex speculates that the old disk failed due to overheating and that linux1 could use an extra fan to prevent this in the future. |
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Tue Nov 27 15:45:08 2007, rob, Configuration, PSL, FSS loop
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It's unclear (to me, at least) what was the end result of the FSS path tweaking before Thanksgiving. Today I measured the open loop gain, and it was still
around 100kHz, even with the gain sliders maxed out, but it looked really crappy with a sharp cutoff around the UGF. Then, on a lark, I pushed around |
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Tue Nov 27 15:47:17 2007, rob, Configuration, IOO, MC loop
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After the FSS running pretty quick, I checked the MC loop. I used TPA 1&2.
MC loop
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