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.

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.

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.

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

https://maglab.caltech.edu/human-magnetic-reception-laboratory/

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:

1. Basics of solder choice from Hackaday
2.  NASA's Tin Whiskers homepage
3. "Tin Whiskers are Real & Complex" Maxim

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.

From Cryo Cav setup

Borrowed ITC510 Laser Driver/TEC controller combo -> QIL

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.

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. 

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?

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")

Here you are.

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

Removed the IR Labs cryostat window for testing. It's on the cryocooler bench, see attached photos

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.

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.

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. 

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.

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.

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.

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. 

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.

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

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.

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.

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.

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

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.

MATLAB license had expired on QIL-WS2 so I had to activate it again.

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

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
 

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)

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.

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. 

See https://nodus.ligo.caltech.edu:8081/40m/16250

[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.

{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.

I checked the internet in the TCS/MD Lab and it is running great and the switch is runing properly.

[JC, Paco]

I took the Moku and iPad from QIL over to 40m for PLL Measurement at the 40m. (SURF)

How to move the large engine hoist through the narrow door

See http://nodus.ligo.caltech.edu:8080/Mariner/122

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

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.

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.