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.
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)
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:
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:
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 . 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.
[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.
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.
I took the Moku and iPad from QIL over to 40m for PLL Measurement at the 40m. (SURF)
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.
The guys are back this morning to reseal the vents. There are some green marks around the place but also what looks like new red ones over the top of the silicon they laid down two weeks ago.
I shutdown the 35W laser using the 'System Off' option on the touch-screen and then turned off the NPRO and removed the key. That key is now in the second drawer down in the first desk. The key for the Gyro NPRO was not in the laser.
Gyro key is in the top drawer of the center workstation.
Sealing is done. They left the air on this time while doing it so they could get as many small leaks as possible. Anyway, that means that the air is still on in the lab and they have finished for good now.
I deleted Alastair's 8000 line elog spam and have attached it here as a zip file. Its called 'DataForAir.gz', but I'm not really sure what this data is from (i.e. what kind of sensor, what location, etc.)
I believe this is data from the particle counter that has been on the gyro table. Alastair offered to upload it to the elog for me since I had several things to do this afternoon, and Frank needed to use ASUS(?) for a while.
I guess that since it is some sort of CSV file it displays it as text. Indeed it is the particle counter in the ATF lab.
Phillip and Tim from Caltech physical plant talked with us today down in the lab about what to do about the HVAC.
They're going to swap out the pre-filters in the air handling room, install another flow meter to check the lab air pressure, and install another temperature sensor in the lab (underneath the south cabinets).
We should record in the ELOG some of the temperature transients we're having now that we think are associated with opening the lab doors. Then we can do a quantitative before and after test to see how things change afterwards.
We probably should also put a temperature sensor out in the hallway to see what's going on out there.
The following is a more-or-less exhaustive photo summary of the sealing work that was recently done in the ATF. The insets indicate the locations of the ducts within the lab.
a minute ago a guy showed up in the lab and wanted to talk to Aidan but couldn't find him. He told me that the air conditioning is now working again and i should let him know.
Particle count in the ATF was about 1.5million before, now decreasing and already below 100k. Can't post data as the usb-to-serial converter is still used at 40m...
I bought about a million converters - Koji has most of them, but I left one with Jan so that you can take that one to get the particle data. Along with the HVAC, this will be a combination of low temperature and particle physics. Very advanced.
the two graphs show the temperature fluctuation in the ATF for 14 days each. The first graph from March, the second for the last 14 days.
scale is the same for both graphs.
Couldn't plot a single graph for the last couple of month as the dataviewer stops displaying most of the June data if you want to plot more than 40 consecutive days or so even if it tells you to do it right.
We now have two temperature controllers in the lab:
A couple of weeks ago they installed a second temperature controller on the South Wall. This drives the HVAC heater that is above the stereo.
The original temperature controller (West Wall) was also upgraded to have a fancy new 1960's-style mechanical display of the setpoint-needle on the front type. Maybe in 50 or 60 years we can get a digital controller in here.
At the moment the second controller has not been calibrated to match the original controller.
Kate noticed that two spots were hot in the lab. The east and west ends of the Gyro optical table.
Just to check that she wasn't crazy, I checked that it was so. The HEPA filters are blowing hot air. The ones near the other table are not. I will contact someone.
Also, Kate has gotten the wall lights replaced as well as the laser safety sign light bulbs.
The HEPA filters at either end of the far optics table are now blowing hot air. The air near the Gyro table seems to be fixed--it's cool.