raptop changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<kmath> <✔NASAVoyager> What a long, strange trip it's been. ⏎ ⏎ What started as a grand tour of the planets has become an interstellar voyag… https://t.co/qd8QsspMqu
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<SnoopJeDi> bofh, ooooooh, thanks for sharing!
<SnoopJeDi> "What's the weather like out there? Should we bring a jacket?"
<B787_300> SnoopJeDi: I am more curious about the radiation environment and how much the sun's magnetosphere deflects
<bofh> B787_300: yeah, I'm likely going to ask about what the heck we know about the angular dynamics of the termination shock where V2 crossed it vis-à-vis V1.
<B787_300> bofh: I just want to know as a what 8f a human went outside termination shock would he die from radiation poisoning
<bofh> I mean you're more likely to die of that *inside* considering the number of solar wind particles inside vs. outside
<B787_300> Plus E&M is black magic to me and I dont really understand it
<bofh> (see the V2 LA1 rate for what I am referring to)
<B787_300> But a relatively small amount of material can protect you from solar wind. But that material is nothing to GCRs
<SnoopJeDi> in terms of energy, maybe? I think the flux is waaaaay higher inside the bubble (which is a big part of why there *is* a bubble AFAIK)
<bofh> Conversely GCRs are infrequent events and don't differ too much inside vs. out (like, there *is* a difference in the B1.B2.C1.^G1 rate inside vs. out, but it's not that great: https://voyager.gsfc.nasa.gov/crs/GIF/v2pg.12m.gif crossing was mid-Nov, and the GCR rate is only approximately doubled).
<SnoopJeDi> Actually, this is a line of questioning I bet someone local would be more curious about than I am, B787_300. We have an entire beamline of our cyclotron dedicated to SEE beamtime
<B787_300> Oh nice
<B787_300> Yeah I am very much an amateur in radiation stuff
<bofh> https://voyager.gsfc.nasa.gov/crs/GIF/v2la.12m.gif contrast solar wind (also I will NEVER tire of seeing this graph. literally checked this plot near-daily for 3 years, seeing it finally plummet the way V1s did was so, so wonderful).
<SnoopJeDi> ...a poor local student got very dismayed when I raised an eyebrow at his refusal to acknowledge that, no, testing gold nuclei is probably not *precisely* because they're worried about solar _wing_
<SnoopJeDi> _wind_
<B787_300> I have been messing around with some nasa code that is about shielding and the options are for GCRs and SPEs
<B787_300> Bofh but if you have shielding that can stop the high energy infrequent events shouldn't it also be able to stop the low energy frequent events
<bofh> B787_300: yes but my point is *unshielded* the difference inside vs. out is not great.
<bofh> (also the obvious point of lack of O₂ will kill you long before radiation will, but that's neither here nor there,)
<B787_300> A doubling is a big difference if your shielding isnt that good and was designed for in solar system use only
<B787_300> And yes assuming you had everything else a human would need to survive in extra-solar space
<SnoopJeDi> B787_300, yea but this line is...a lot of private aerospace...
<SnoopJeDi> they are most certainly testing nuke hardened stuff heh
<SnoopJeDi> "anyway congrats on the independent funding tho!"
<B787_300> SnoopJeDi: funding of the "here test this. We cant tell you why or what it will be used in but we need the data" funding?
<SnoopJeDi> pretty much exactly that
<SnoopJeDi> cyclotron people stay away from that line, it's pretty private
<B787_300> SnoopJeDi: which school is this at?
<SnoopJeDi> B787_300, Texas A&M https://cyclotron.tamu.edu/
<SnoopJeDi> neat little experimental platform system, has 3-axis linear actuation and I *thiink* some provisions for rotation? And there's an in-air station, which makes swapping things in and out a piece of cake
<SnoopJeDi> that's what they really love, because the minimum billing time is 8 hours, so if they need to do a whole bunch of relatively short experiments with different equipment, it's about as hard as lining the equipment up outside in the hallway and wheeling it into the room
<SnoopJeDi> (or so I've heard)
<B787_300> Why is the minimum billing time so high
<SnoopJeDi> because it's a cyclotron
<SnoopJeDi> not a vending machine
<B787_300> What you cant just turn it on to spit out one or two protons
<SnoopJeDi> it serves quite a few beamlines, for one
<B787_300> What is the per hour cost? I am more familiar with wind tunnels and the are $$$$$$$$$$$$ especially the large ones
<SnoopJeDi> They can turn beam off in them though, so that's a slightly less finicky matter, but there's a lot of facility complexity overhead when you're using a university machine
<SnoopJeDi> B787_300, it's probably a decent comparison
<SnoopJeDi> https://cyclotron.tamu.edu/ref/Beam_Change_Time.PDF gives you a sense of the man-hours involved in changing beams, for instance
<SnoopJeDi> as well as the variety of species, heh.
<SnoopJeDi> (radioactive beams Eventually™ hype?)
<B787_300> That is hours of time to change!! Or minutes
<SnoopJeDi> I...am not super sure. I think it's minutes.
<B787_300> I would hope so
<SnoopJeDi> and I think the color tells you how wrong things might go
<B787_300> Yeah the color I can understand
<SnoopJeDi> on the flipside
<SnoopJeDi> they can change beam species that flippin fast!
<B787_300> Well I assume the pumps and cyrocoolers on the cyclotron are fast
<SnoopJeDi> Yea all of that is pretty simple
<SnoopJeDi> It's more that I'm impressed with the experience operating and tuning the machine in different modes, and making changes to the injector complexes
<B787_300> Also if you want to see freaking massive cyrocoolers you should see the ones in the giant vacuum chamber at plum brook
<SnoopJeDi> They just got some new resonators actually
<SnoopJeDi> and I'm kicking myself for not having taken a picture when I got to see them
<SnoopJeDi> maybe I can ask a friend to send me some pictures
<B787_300> Plus seeing that giant vacuum chamber is cool. It is where the filmed the opening scene of avengers ( where Loki arrives on earth) and the door is gigantic.
<B787_300> Plus it is actually a vacuum chamber in a vacuum chamber and the inner one is a special aluminium (a 3000 series) that doesn't get radioactive when exposed
<B787_300> They were going to use the chamber for testing out NERVA engines back in the day
<SnoopJeDi> Yea I think TRIUMF was in one of the Avengers movies
<SnoopJeDi> with lots of CG
<SnoopJeDi> vs a normal photo https://cycops.triumf.ca/homepage/tank5.jpg
<B787_300> And it is amazing
<SnoopJeDi> :o
<SnoopJeDi> I should watch those movies sometime
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<UmbralRaptop> Rindler has cooler problems than what we are actually doing. https://photos.app.goo.gl/eBorwB9S35c2sZWG6
<egg> meow
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<egg|cell|egg> Bofh: heh, Wanner was also at the seminar
<UmbralRaptop> Numerics in Geneva?
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* UmbralRaptop now has 7 TiB of spinning rust on my desk at work
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<egg|work|egg> UmbralRaptop: nice
<egg|work|egg> UmbralRaptop: well, 7 TiB = 7,nice TB
<kmath> <eggleroy> @stephentyrone @demize95 @bofh453 Compare with the same cats subjected to nonsymplectic integration (shown here in… https://t.co/MwSvGykFAH
* egg|work|egg pets the sympleggtic form
<bofh> miaou
<UmbralRaptop> egg|work|egg: silly GR questions: 1) Can gravitational red/blueshift just be thought of as a change in potential energy? (also, why does Hartle insist on describing it in terms of acceleration?)
<UmbralRaptop> 2) If I get fed up with my physics prof and throw him into a blackhole, will I see him redshift fr
<UmbralRaptop> om both velocity increases and his being deeper in the potential well?
<egg|cell|egg> Cc bofh
<UmbralRaptop> egg: binary cats?
<egg|cell|egg> Yes
<egg|cell|egg> One of them using branches as laptop corners
<bofh> Note: I do not recommend attempting to carry a HALF-TON, FULL LN2 DEWAR DOWN THE *STAIRS*.
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<UmbralRaptop> aaaaaa
<kmath> <ndrew_lawrence> this is not photoshopped, feel like thats an important clarification to make here https://t.co/fEQ3ySaPPf
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<SnoopJeDi> bofh, he ought to be careful, if he keeps it up he might damage the legislature's good name
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<UmbralRaptop> current yakshave status: attempting to (re)install sed
<egg> current status: rereading Conjugate-symplecticity of linear multistep methods, and reading Backward error analysis for multistep methods, to try to figure out what happens to cats under conjugate-symplectic integration
* UmbralRaptop may have broken homebrew in the process? OSX is confusing
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<bofh> Streamripping the Voyager webcast for anyone who wants it later.
<SnoopJeDi> OH RIGHT
<SnoopJeDi> bofh, link?
<SnoopJeDi> thank <3
<bofh> HOLY SHIT IT's SUZY DODD
<bofh> ...fittingly, she's in The Center of The Universe (DSN central control)
<bofh> this is a bit more pop-sci than I was expecting (granted the last webcast I watched was the von Kármán lecture on the Heliopause Crossing), but still interesting.
<SnoopJeDi> bofh, we've been getting a lot of GW talks here recently, and I've been pondering why some very accessible material just never gets old
<SnoopJeDi> I suspect it's a nice opportunity for a "breather" when you're closer to SME level that lets you review and collate the material for yourself.
<bofh> Indeed.
<bofh> Yeah that was amazing.
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