 Wed Jul 5 10:23:18 2017, Steve, Update, safety, liquid nitrogen boil off 
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The liquid nitrogen container has a pressure releif valve set to 35 PSI This valve will open periodically when contains LN2
The exiting very cold gas can cause burning so it should not hit directly your eyes or skin. Set the pointing of this valve into
the corner. |
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Tue Jul 25 14:27:19 2017, Steve, Update, safety, safety training
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| Kira Dubrovina and Naomi Wharton received 40m specific basic safety training. |
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Mon Oct 30 08:08:06 2017, Steve, Update, safety, safety training
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| Udit Kahndelwal received 40m specific basic safety traning on Friday, Oct. 27 |
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Tue Jan 2 16:24:29 2018, gautam, Update, safety, Projector periodically shuts itself off
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I noticed this behaviour since ~Dec 20th, before the power failure. The bulb itself seems to work fine, but the projector turns itself off after <1
minute after being manually turned on by the power button. AFAIK, there was no changes made to the projector/Zita. Perhaps this is some kind of in-built
mechanism that is signalling that the bulb is at the end of its lifetime? It has been |
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Wed Jan 31 15:46:05 2018, Steve, Update, safety, crane inspection
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Annual crane inspection with load tests is scheduled for Monday, Feb 5, 2018 from 8 to 11:30am
Konecranes rescheduled this appointment to: Monday,
Feb 12, 2018 |
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Mon Feb 12 14:56:00 2018, Steve, Update, safety, crane inspection 2018
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Our 3 cranes passed professional inspection. Fred Goodbar of Konacrane with 450 lbs load at full extension.
Certificates will be posted in 40m wiki as they arrive.
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Tue May 15 13:34:30 2018, Steve, Update, safety, surf safety training
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| Pooja and Keirthana received 40m specific basic safety training. |
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Thu Jun 28 13:12:20 2018, Steve, Update, safety, surf safety training
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Shruti and Sandrine received 40m specific basic safety training this morning.
Quote:
Pooja and Keirthana received 40m specific basic safety training. |
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Tue Sep 18 14:02:37 2018, Steve, Update, safety, safety training
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Yuki Miyazaki received 40m specific basic safety training.
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Thu Oct 25 16:17:14 2018, Steve, Update, safety, safety training
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| Chub Osthelder received 40m specific basic safety traning today. |
 Fri Oct 18 18:13:55 2019, Koji, Update, safety, Laser interlock looks OK
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| I've checked the state of the laser interlock switch and everything looked normal. |
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Mon Oct 21 11:44:19 2019, gautam, Update, safety, Interlock reconnected to Innolight controller
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We also took this opportunity to re-connect the interlock to the Innolight controller (after it was disconnected for diagnosing the mysterious NPRO self-shutdowns).
The diode pump current was dialled down to 0, the interlock wires reconnected, and then the diode current was ramped back up to the nominal 2.1 A. The
fan to cool the unit remains mounted in a flaky way as we couldn't locate the frame Chub had made for a more secure mounting solution. |
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Thu Aug 6 22:57:20 2020, gautam, Update, safety, New live HV Supplies
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Be aware that there is now a KEPCO HV supply that is energized, sitting on the floor immediately adjacent to the OMC rack, east of the AP table. It is
currently set to 100 V DC, and a PI PZT installed on the AP table has its 3 PZTs energized by said supply (via an OMC piezo driver). I will post pictures
etc of the work from the last 10 days over the weekend. |
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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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Wed Mar 17 15:02:06 2021, gautam, Update, safety, Door to outside from control room was unlocked
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I came into the lab a few mins ago and found the back door open.
I closed it. Nothing obvious seems amiss.
Caltech security periodically checks if this door is locked but it's better if we do it too if we use this door for entry/exit. |
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Thu Mar 18 12:35:29 2021, rana, Update, safety, Door to outside from control room was unlocked
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I think this is probably due to the safety tour yesterday. I beleive Jordan showed them around the office area and C&B. Not sure why they left through
the control room.
Quote:
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Thu May 18 15:20:29 2017, jigyasa, Summary, telescope design, Telescope Design for the Gig-E cameras 6x
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With the objective of designing a telescope system for the Gig-E, a system of two lenses is implemented. A rough schematic of the telescope system
is attached. Variables in the system include the focal lengths of the two spherical lenses(f1, f2), distance between the lenses(t), distance between the
test mass and the lens combination(u), distance between the other lens and the sensor(v). Also the size of the object to be desired ranges from 3’’ |
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Mon May 22 10:15:14 2017, jigyasa, Summary, telescope design, Lens tubes and object distances
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Since the f numbers of the lenses in the proposed design with biconvex lenses are a little less than 5 and the conjugate
ratio(that is the ratio of object to image distance) is greater than 5, I explored the use of plano convex lenses, but with the same focal lengths, the
accessible u-v range is restricted with the planoconvex rather than biconvex lenses. |
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Mon May 22 15:01:41 2017, jigyasa, Update, telescope design, Updated Telescope design with 1'' eye piece
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I examined the use of a single lens system for the available range of focal lengths, for the required magnification and
found that a focal length of at most 100 mm would be required to sufficiently cover the object distance range. This would greatly compromise with the f-number
and hence lead to a lot more spherical aberrations. |
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Mon Mar 8 12:01:02 2021, Paco, Anchal, Summary, training, Investigate how-to XARM locking
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[Paco, Anchal]
- Started zoom stream; thanks to whoever installed it!
- Spent some time trying to understand how anything we did last thursday lead to the sensing matrix change, but still cannot figure it out. |
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Mon Mar 8 12:40:35 2021, gautam, Summary, training, Investigate how-to XARM locking
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For the arm locking, the "Restore Xarm (XARM POX)" script from the "IFO_CONFIGURE" MEDM screen should get you there (I just checked
it and it works fine). It is worth getting a hang of the PDH signal chain (read what the script is doing and map it to the signal chain) so you get a feel
for where there may be offsets, saturations, what the trigger logic is etc. The LSC overview screen is supposed to be pretty intuitive (if you think it |
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Fri Mar 12 11:44:53 2021, Paco, Anchal, Update, training, IMC SUS diagonalization in progress
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[Paco, Anchal]
- Today we spent the morning shift debugging SUS input matrix diagonalization. MC stayed locked for most of the 4 hours we were here, and we
didn't really touch any controls. |
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Mon Mar 15 08:55:45 2021, Paco, Anchal, Summary, training,
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[Paco, Anchal]
Found IMC locked upon arrival.
Since "allegra" was set up as an additional workstation, we tried using it but discovered
the monitor ist kaput. For the sake of debugging, we tested VGA and DVI inputs and even the monitor lying around (also labeled "allegra") |