ID |
Date |
Author |
Type |
Category |
Subject |
2274
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Fri Dec 7 11:59:29 2018 |
awade | Lab Infrastructure | General | Cardboard and packaging in the lab |
There are a bunch of cardboard boxes and paper packing material in the QIL lab and the dust levels are at the point that I can see particles despositing on all surfaces.
Can we please make an effort to remove all these paper materials pronto from the lab and get a weekly wet floor sweep going?
Cardboard materials should removed from shipped items before they make it into the lab.
We don't have a air particle counter in this lab, maybe we should. |
2275
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Fri Dec 7 14:43:20 2018 |
Rahul | Lab Infrastructure | General | Cardboard and packaging in the lab |
I have removed all the cardboard boxes and packaging materials which belongs to cryo-vacuum chamber.
edit awade Fri Dec 7 20:30:03 2018: Awesome thanks so much.
Quote: |
There are a bunch of cardboard boxes and paper packing material in the QIL lab and the dust levels are at the point that I can see particles despositing on all surfaces.
Can we please make an effort to remove all these paper materials pronto from the lab and get a weekly wet floor sweep going?
Cardboard materials should removed from shipped items before they make it into the lab.
We don't have a air particle counter in this lab, maybe we should.
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2295
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Tue Jan 8 11:38:49 2019 |
awade | Lab Infrastructure | General | Roughing pump leaking oil on bake rig |
The roughing pump attached to the bake rig in the QIL (room B265B) is leaking oil. It seems to be coming out of the box that should be filtering the exhaust (pictured below).
Its been clean up but please don't use bake rig for now and take care when entering lab.
Oil seems to be coming out of the exhast filter
I'll ask Chub to have a look.
Edit Tue Jan 8 19:58:03 2019 (awade): Chub has now fixed this. He cleaned the filter and installed a breather tube with a cloth wire-tied to the end to prevent futher spillage |
Attachment 2: IMG_4862.JPG
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2326
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Thu Apr 11 20:50:17 2019 |
rana | Howto | General | how to learn quickly |
https://maglab.caltech.edu/human-magnetic-reception-laboratory/ |
2418
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Sun Sep 8 16:08:04 2019 |
rana | Electronics | General | Solder: what kind of solder to use and why? |
This is a summary of some information on types of solder and their usefulness.
Summary: use the 63/37 Sn/Pb solder from Kester. It is eutectic and has a low melting point so that your opamps won't get damaged.
Eutectic:
We want our solders to be "eutectic" so that it goes from the liquid phase directly to solid with no intermediate slurry. This makes a reliable (and nice looking!) solder joint.
Lead:
The tin-lead solder is a good combo.
Links:
- Basics of solder choice from Hackaday
- NASA's Tin Whiskers homepage
- "Tin Whiskers are Real & Complex" Maxim
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2422
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Fri Sep 20 17:31:25 2019 |
Duo | DailyProgress | General | General update |
Basically two things are happening in the lab now.
1) We are assembling a shop list for the lab, buying a couple things to put the stuff together. After the purchase, relevant items will be uploaded under this post.
2) I made the TIA with OP27, trying to measure it noise. But the lab has too much environment noise. I will try measuring it after hours or in the EE shop and see if that gives a better results. Progress on that front will reply to this post later too. |
2436
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Tue Oct 22 15:55:52 2019 |
Koji | Electronics | General | Borrowed ITC510 from Cryo |
From Cryo Cav setup
Borrowed ITC510 Laser Driver/TEC controller combo -> QIL |
2445
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Fri Nov 15 17:29:14 2019 |
Raymond | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
See attached photos for the internal layout of Zach's cantilever cryostat (all internal components left in cryo lab (except the heater)) The holes are on a 1cm grid and, I believe, are threaded for 4-40 (will check Monday). The internal 'window' is about an inch off the colplate. There is ~2 inches of space from the colplate to the first radiation shield lid.
The external optical port on the vacuum tank is 1.75" from the bench and is 0.75" in diameter. The cryostat is missing the lid o-ring, electrical feedthrough vacuum port, and intermediary valve between the vacuum space and the vacuum pumps. I will search for these on Monday. |
Attachment 1: IMG_0270.JPG
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Attachment 2: IMG_0269.JPG
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2448
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Tue Nov 19 20:16:40 2019 |
Raymond | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
The cold plate breadboard holes are indeed 4-40.
I've installed a new o-ring and vacuum valve, but I've scoured the labs for any piece that fits the open port on the side of the cryostat and have come up empty-handed. I've attached a photo with all of the IR labs input pieces found thus far (except duplicates or ones that match these same dimensions), none fit the drill pattern or counter sunk hole of the cryostat port. I tried but could not find mention of this specific port's removal in the elog history.
Spent a while trying to make a Franken-stat from the innards and limbs of the other decommisioned IR lab cryostats but nothing allowed for a correct optical path. So I then started to make a custom port with a 122 o-ring and an old ISO blank flange, but I need a drill bit larger than 0.5" for the center electrical feedthrough and am having ID card issues accessing the student shop over in CES.
I will call IR labs tomorrow and see if they have an a standard piece for this feedthrough. |
Attachment 1: IMG_0483.JPG
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2450
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Wed Nov 20 11:59:17 2019 |
Koji | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
Ah, I have designed the PD holder with the venting targeted for 1/4-20 holes with 1" grid...
The dog clamps to hold the PD units also need to be compatible with 4-40 screws.
How big the hole diameter should be? Can you find a suitable drill at the 40m?
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2451
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Wed Nov 20 12:25:58 2019 |
Koji | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
The large cryostat has 1/4-20 holes on a 2 inch grid
The IR labs cryostat has 4-40 holes on a 1 cm grid
I'll check the 40m for a bit (5/8-3/4") |
2452
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Wed Nov 20 17:44:10 2019 |
Koji | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
Here you are. |
Attachment 1: P_20191120_174034_vHDR_On.jpg
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Attachment 2: P_20191120_174040_vHDR_On.jpg
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2454
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Thu Nov 21 21:45:10 2019 |
Raymond | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
Ordered the electrical feedthrough from IR Labs on overnight shipping. I've attached the diagram of the feedthrough, 32 pin is the only available configuration for this size feedthrough.
Will attempt to use my makeshift 12 pin feedthrough if the proper one does not arrive tomorrow (thanks Koji for the 40m drill bit tip). I'll clear the bench of the IR Labs carcasses tomorrow.
UPDATE: feedthrough will arrive by 10:30 on Monday the 25th |
Attachment 1: DT02H_18_32PN.pdf
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2456
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Fri Nov 22 13:21:26 2019 |
Raymond | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
Removed the IR Labs cryostat window for testing. It's on the cryocooler bench, see attached photos |
Attachment 1: IMG_0497.JPG
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Attachment 2: IMG_0498.JPG
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2457
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Fri Nov 22 15:33:40 2019 |
Koji | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
Salvaged an assort of vented/non-vented screws, washers, spring washers, and clamps for #4-40 & 1/4-20 from the 40m cleanroom stock. They are clean enough for the cryostat use. |
Attachment 1: P_20191122_150845_vHDR_On.jpg
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2461
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Tue Nov 26 15:36:59 2019 |
Raymond | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
The IR Labs cryostat is now pumping down. The thor labs posts are necessary for centering the optical port at a height of 5.5". The orange cabinet used to elevate the pumping station was relocated from next to the computer (was, and still is, empty). The power supply is for the wide range vacuum gauge attached to the pumping line.
I've ordered a liquid nitrogen dewar for arrival Monday morning.
For future reference, the gauge communicates via a VGA port, for which the pin-to-wire association is as such: 1-Black; 2-Brown; 3-Red; 4-Orange; 5-Yellow; 6-Green; 7-Blue; 8-Purple; 9-Grey; 10-White; 11-Pink; 12-Cyan; 13-Black/White; 14-Brown/White; 15-Red/White (MKS 901P non-ethercat wiring diagram)
edit by RXA: replaced multi GB PDF w a reasonable JPG. |
Attachment 1: IRLabsQIL.jpg
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2467
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Wed Dec 4 13:54:04 2019 |
Raymond | Lab Infrastructure | General | Moved IR Labs cryostat into QIL from Cryo Lab |
Update on the 32 pin female connector:
Mouser's overnight delivery was rejected on 12/3 by mail services for being soaked in an "unkown liquid" and was therefore taken away by the courier for return to Mouser. This was the last one in stock, so I ordered a replacement through Digikey for express delivery this morning 12/4, but it has not yet arrived. I've called Fedex and the package was sorted at the LA facility but not given to the courier for morning delivery. It is now estimated for delivery this afternoon. |
2491
|
Mon Apr 6 18:35:48 2020 |
Koji | Summary | General | West Bridge flooding Apr 6th |
West Bridge flooding Apr 6th due to rain in the night
Looks like the first responder was Calum. The attached photos were sent from him.
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Attachment 1: image2.jpeg
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Attachment 2: image1.jpeg
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2492
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Mon Apr 6 18:38:50 2020 |
Koji | Update | General | West Bridge flooding Apr 6th |
To check the status of all the labs, I went to WB. There was no ongoing water leakage in the labs.
Attachment 1: The subbasement was completely dry.
Attachment 2: Upon the lab inspection, I took PPE from the OMC lab. This was intended to prevent me to pick up anyone's anything and you to pick up my anything.
Attachment 3: The EE shop has no problem
Attachment 4: Cryo Lab. No problem.
Attachment 5: Crackle Lab. No problem, but a lot of dead cockroaches on the floor!
Attachment 6: OMC Lab. No problem.
Attachment 7: C.Ri.Me Lab. Gabriele has already checked the status in the morning. And I found no problem. Didn't bother to turn on the light.
Attachment 8: CTN Lab. No problem.
Attachment 9: QIL Lab. The floor was mostly dry. Did someone wipe the floor?
Attachment 10: Some water drip was found in front of the workbench.
Attachment 11: It comes from the ceiling.
Attachment 12: Left a trash box to catch future possible leak.
Attachment 13/14: TCS Lab. No problem found.
Attachment 15: As per Aidan's request, the instruments were moved to the North-East area of the room to avoid future possible leak. |
Attachment 1: 20200406143251_IMG_9618.jpg
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Attachment 2: 20200406143856_IMG_9621.jpg
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Attachment 15: 20200406145347_IMG_9652.jpg
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2493
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Mon Apr 6 19:01:21 2020 |
Koji | Update | General | West Bridge flooding Apr 6th |
Additional notes:
I did not see anyone in the building.
Attachment 1/2: Our labs have no sticker/paper to indicate any disinfection of the room. (Make sense)
Attachment 3: Most of the basement offices have the notes to indicate disinfection.
Attachment 4/5: Our offices have no notes. |
Attachment 1: 20200406151420_IMG_9653.jpg
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Attachment 2: 20200406151428_IMG_9654.jpg
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Attachment 3: 20200406151459_IMG_9655.jpg
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Attachment 4: 20200406151633_IMG_9656.jpg
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Attachment 5: 20200406151709_IMG_9658.jpg
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2499
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Fri Jul 24 04:54:57 2020 |
Raymond | Lab Infrastructure | General | MDF repair |
First day back (7/15) found the particle board trim w/ powerstrip on the QIL workbench had collapsed. Re-glued and added 4 screws to the middle board where vertical boards from the shelves extended low enough. See attached photos for before, during, and after looks. |
Attachment 1: MDFrepair_before.jpg
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Attachment 2: MDFrepair_during.jpg
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Attachment 3: MDFrepair_after.jpg
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2507
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Wed Sep 23 00:26:59 2020 |
aaron | Misc | General | lab entry |
I entered QIL just before Wed Sep 23 00:27:51 2020 to check out and photograph the sprinklers, spent about 20 min looking around the lab and drawing inspiration for in cryo. Wore shoe covers and gloves, touched nothing, sanitized doors after. |
2521
|
Fri Nov 20 18:47:42 2020 |
Koji | Summary | General | Permenant exchange of TED200C(QIL) and TED200C(2umECDL) |
I moved the brand new TED200C on the workbench to Crackle for 2um ECDL (permanently)
The TED200C temp controller used in the 2um PD test setup will stay there (permanently)
http://nodus.ligo.caltech.edu:8080/SUS_Lab/1851 |
2522
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Fri Nov 20 18:49:43 2020 |
Koji | Summary | General | Instrument loan |
FEMTO DLPCA200 low noise preamp (brand new)
Keithley Source Meter 2450 (brand new) => Returned 11/23/2020
were brought to the OMC lab for temporary use. |
2525
|
Tue Dec 22 10:42:17 2020 |
rana | Summary | General | Instrument loan |
I was thinking about getting this new current pre-amp from NF:
http://www.nfcorp.co.jp/english/pro/mi/loc/pre/ca5351/index.html
It seems to have a good noise performance and has a built in low pass filter and also a remote interface.
The FEMTO seems less fancy, but their noise performance is actually 2-3x better.
Quote: |
FEMTO DLPCA200 low noise preamp (brand new)
Keithley Source Meter 2450 (brand new) => Returned 11/23/2020
were brought to the OMC lab for temporary use.
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2526
|
Tue Dec 22 15:20:14 2020 |
Koji | Summary | General | Instrument loan |
Is the reverse bias programmable? FEMTO has a bias trimmer on it. It's useful in the usual application, but for automation, the configuration of the input becomes cumbersome. |
2527
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Tue Dec 29 17:53:21 2020 |
rana | Summary | General | Instrument loan |
doesn't seem so, but they sell this one:
http://www.nfcorp.co.jp/english/pro/mi/loc/m_lp/p_lp/lp_6016_01/index.html
which has a USB interface and pretty good voltage noise spectrum
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2528
|
Fri Jan 15 10:55:23 2021 |
Paco | Lab Infrastructure | General | Borrow AG4395A |
This morning I rolled the AG4395A from Adaptive Optics lab (labeled QIL, IP = 10.0.1.64) for use in Crackle. Will return after end using. |
2542
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Fri Mar 19 13:51:16 2021 |
Aidan | Computing | General | Activated MATLAB on QIL-WS2 |
MATLAB license had expired on QIL-WS2 so I had to activate it again. |
2543
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Fri Mar 19 15:13:25 2021 |
Aidan | Computing | General | Adding fb4:/usr/share/advligorts to QIL-WS2 |
Adding fb4:/usr/share/advligorts to QIL-WS2 to /etc/fstab file
Should help access to CDS_PARTS model file in Simulink on QIL-WS2
Except access is denied by FB4 |
2572
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Thu May 20 16:57:32 2021 |
Koji | Electronics | General | Keithley Source Meter returned to Downs |
I've returned the Keithley Source Meter unit
- The unit (Keithley 2450?2460?)
- A power cable
- A pair of banana clips
- the transistor test fixture & triax cable/connectors
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Attachment 1: P_20210520_154439.jpg
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Attachment 2: P_20210520_154505.jpg
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Attachment 3: P_20210520_154523.jpg
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2589
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Wed Jun 16 17:17:12 2021 |
Koji | Update | General | I2 cell |
I was searching an I2 (Iodine) cells back to the days of the laser gyro.
I found a likely box at a very tricky location. Took the photos and returned to this tricky place.
2021/Jul The box was moved to the OMC lab (KA) |
Attachment 1: P_20210616_170104.jpeg
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Attachment 2: P_20210616_170038.jpeg
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Attachment 3: P_20210616_170021.jpeg
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2593
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Wed Jun 23 16:25:49 2021 |
Ian MacMillan | DailyProgress | General | Network Issue |
I accidentally powered down and restarted the TP-link safe stream router and now nothing will connect to it. Not even things that are plugged into it. I can't even connect to the router's setup screen. I have no idea how to solve this issue short of resetting the router. I don't know how it was configured before so I will not reset it because I don't know how it was configured. |
2595
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Tue Jun 29 15:45:43 2021 |
Ian MacMillan | DailyProgress | General | Network Issue |
I was able to connect to the router (the one on top of the switch in the rack next to the orange tool drawers) and reconfigure it using the same internal IP as found labeled and mentioned in [2201]. The router now has a different external IP that I wrote on the router (twice). The network/router and switch is now working in the lab.
Update: It turns out that the router reset itself somehow. so any settings/ port forwarding that was set up before has probably been wiped out and would need to be set up again.
SSHing into the QIL needs to be set up again. |
2613
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Wed Jul 21 14:53:28 2021 |
Koji | Summary | General | Jul 17, 2021: Canon camera / small silver tripod / macro zoom lens / LED ring light borrowed -> QIL |
See https://nodus.ligo.caltech.edu:8081/40m/16250 |
2616
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Fri Jul 23 20:53:40 2021 |
Koji | Summary | General | Jul 17, 2021: Canon camera / small silver tripod / macro zoom lens / LED ring light returned / ELectronics borrowed |
[Returned] Brought one HAM-A coil driver (D1100687 / S2100619) and one Satellite Amplifier (D1002818 / S2100741) from the 40m
Also brought some power cables.
Brought ~1m of 0.0017" (~43um) misical wire. This will make the tension stress be 341MPa. The safety factor will be ~7.
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Attachment 1: P_20210723_212158.jpg
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2758
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Wed Apr 20 00:00:39 2022 |
Yehonathan | Lab Infrastructure | General | Preparing for planned power outage |
{Yehonathan, Shruti}
We shut down the workstations and the FBs by doing sudo shutdown and unplugged them from the wall.
Electronic equipment on the FB rack was shut down and unplugged from the wall.
Diablo's current was ramped down and the control unit was shutdown. Optical table electronic equipment was shutdown and the table's powerstrip was switched off.
Equipment under the optical table was switched off and unplugged. |
2763
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Thu Apr 28 11:39:24 2022 |
JC | Electronics | General | Network |
I checked the internet in the TCS/MD Lab and it is running great and the switch is runing properly. |
Attachment 1: IMG_0671.jpeg
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2788
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Thu Jun 23 11:56:21 2022 |
JC | Electronics | General | Equipment |
[JC, Paco]
I took the Moku and iPad from QIL over to 40m for PLL Measurement at the 40m. (SURF) |
2826
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Thu Jan 12 11:50:20 2023 |
Koji | Howto | General | How to move the large engine hoist through the narrow door |
How to move the large engine hoist through the narrow door
See http://nodus.ligo.caltech.edu:8080/Mariner/122 |
1
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Sun Oct 21 23:06:49 2007 |
rana | Lab Infrastructure | HVAC | Its too cold again |
Friday evening it was a pleasant 70 deg F in the lab.
Tonight (Sunday evening) its back down to 61 deg F.
This happened ~a week ago; emailed Jeanne and Jo Ann and it got fixed. Will
try again and post results here. |
12
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Wed Dec 12 16:10:19 2007 |
tobin | Lab Infrastructure | HVAC | Lab Temperature |
The lab temperature at 2pm was a comfortable 69 degrees. |
13
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Wed Dec 12 16:19:00 2007 |
tobin | Lab Infrastructure | HVAC | Lab Temperature |
I connected the particle counter to the Dell computer for PEM data logging (temperature, humidity, and particle count). The data shows that while the temperature is comfortable right now, it was quite warm in here yesterday (78 degrees). A plot is attached.
For this I made a serial cable using two DB9-to-RJ45 converters and a length of Cat5 ethernet cable. The computer end of the cable has a female connector; the particle counter end of the cable has a male connector. Only three conductors are connected: transmit (pin 2), receive (pin 3), and ground (pin 7 on the particle connector, pin 5 on the computer). I used the USB-to-serial dongle, which shows up in Linux as /dev/ttyUSB0.
Someone later can write a script to automatically poll the particle counter for new data. For now, I just emptied its internal buffer, which stores the last 200 measurements. The secret to communicating with the particle counter, which I learned by examining the c1psl statecode at the 40m, is to first transmit the letter "U". After this, the particle counter will listen to you and do what you say. In particular, sending a capital letter "A" will cause the counter to emit the next measurement from its buffer, until there are none left, at which time it will just respond with "#". To read the data I just ran a "cat /dev/ttyUSB0" command in one terminal, while in another terminal I ran a loop "while 1; echo -n A > /dev/ttyUSB0; sleep 1; end". I set the serial port parameters (9600BPS, 8N1) using Minicom.
Also, there's a Matlab script to parse and plot the output, in ~controls/tobin. |
Attachment 1: temperature.pdf
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14
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Thu Dec 13 18:47:02 2007 |
tobin | Lab Infrastructure | HVAC | Lab Temperature |
Extech: 66.8°F, 25%RH. Met One: 68°F, 20%RH.
Here is the datalogger's contents:A 121307 161942 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000130 LOC 000000 C/S 000E54
A 121307 164641 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000130 LOC 000000 C/S 000E53
A 121307 171340 0100 0.3 000000 0.5 000000 TMP 000685 R/H 000130 LOC 000000 C/S 000E52
A 121307 174039 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000200 LOC 000000 C/S 000E53
A 121307 180738 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000210 LOC 000000 C/S 000E57
A 121307 183437 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000210 LOC 000000 C/S 000E56
A 121307 190136 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000195 LOC 000000 C/S 000E5C
A 121307 192835 0100 0.3 000000 0.5 000000 TMP 000685 R/H 000195 LOC 000000 C/S 000E69 I'm not sure why it only starts at 12:13pm today. Also, looks like its clock is 50 minutes fast. |
15
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Tue Dec 18 13:49:50 2007 |
tobin | Lab Infrastructure | HVAC | Lab Temperature |
Extech: 68.6°F, 57%RH. Met One: 68°F, 53%RH. Drizzling outside.
Particle counter log shows stable temperature 67.5-69.5°F over the last four days. |
Attachment 1: temperature-20071218.pdf
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16
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Fri Dec 21 21:27:12 2007 |
tobin | Lab Infrastructure | HVAC | Lab Temperature |
Extech: 67.9°F, 26%RH. Met One: 68°F, 20%RH. Clear & cold outside.
Particle counter log looks stable. |
18
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Wed Jan 2 15:10:24 2008 |
tobin | Lab Infrastructure | HVAC | Lab Temperature |
The lab temperature appears to have been stable over the holiday, always between 68.5 and 70.0 degrees F. (There is no data from Dec 28-29 due to a computer reboot.) |
90
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Tue Sep 9 15:49:22 2008 |
Dmass | Lab Infrastructure | HVAC | HEPA Filters |
I had turned off the east HEPA filter with Masha for a noise measurement, and I forgot to turn it back on until today. Also, it looks like someone had unplugged the west HEPA filter and not plugged it back in. The latter I noticed while changing the power cabling, so it's possible that the west HEPA was running the whole time and I only noticed that I had just unplugged it...but I think this was a long term situation.
Also, the particle counter was reclaimed by the 40m during the vent after the earthquake, so we haven't had one on the table for some time. I had not been running the laser that much during the time when both filters may have been off, but it is worth noting in case there is unexplained dirtiness noticed in the future. |
224
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Tue Aug 4 15:46:46 2009 |
Dmass | Lab Infrastructure | HVAC | Temperature update |
It has been a brisk 72 degrees for a while (~1 week?) in lab. This is apparently the proper temperature for keeping graduate students awake, and lasers cool. |
296
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Mon Aug 31 10:17:15 2009 |
Dmass | Lab Infrastructure | HVAC | Smokey Flavor in Lab |
The lab, like all of Pasadena right now, has a smokey flavor to it. It seems significantly stronger in the lab than in the hallway. |