--- Log opened Fri Dec 24 00:00:10 2021
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10:09 < docl> muurkha: I think I see a typo, areal density is shown as g / cubic meters instead of square meters
10:13 < docl> cool that utf-8 can do superscripts, I didn't realize that
10:18 < docl> "A km² of sunlight is about 3 megawatts at Earth’s orbital distance" wouldn't that be more like 1400 MW?
11:47 < docl> hmm. the main thing increasing mass from 0.18g/m^2 to 2g/m^2 is the aluminum grid?
11:57 < docl> for the low work function element, could we maybe use lithium? 2.93 eV
12:39 < superkuh> muurkha, I was wrong.
12:40 < superkuh> This is not what I thought it was. It's really neat.
12:40 < superkuh> Sorry about that.
13:30 < kanzure> cypherpunks documentary thing https://www.youtube.com/watch?v=9vM0oIEhMag
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14:28 < docl> .t https://iopscience.iop.org/article/10.1088/1361-648X/aa79bd/meta
14:28 < saxo> ShieldSquare Captcha
14:28 < docl> "From calculated key parameters that determine the work function, we find that, regardless of the amount of charge transfer, K on WTe2 induces the largest surface dipole moment, which consequently makes the surface work function of as small as 0.8 eV, the smallest reported to date, and that the work function is lowered further to 0.7 eV by lattice strains"
14:29 < docl> .t https://sci-hub.se/10.1088/1361-648X/aa79bd
14:29 < saxo> Sci-Hub | Super low work function of alkali-metal-adsorbed transition metal dichalcogenides. Journal of Physics: Condensed Matter, 29(31), 315702 | 10.1088/1361-648X/aa79bd
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17:21 < docl> I wonder if it could be possible to use an e-beam (or some flavor of electromagnet) to knock the electrons to a further distance from the emitter so you can use a smaller collector and higher voltage potential
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20:00 < docl> lsneff: if you get around to reading dernocua (for now you'd have to check out the git and look under text/photoemissive-power.md) looks like muurkha came up with 50W/g (50kW/kg) as plausible estimate... the areal density he landed on is higher than I was originally assuming, but I was lowballing the efficiency for my back of envelope estimate (72kW/kg based on 1%) so it ended up similar ballpark. 
20:00 < docl> interesting that thin film could do better
20:11 < docl> the ISS uses 8 solar array wings massing about 1 ton each that get 84-120kW average or up to 240 in direct sunlight. so about 30W/kg in direct sunlight. we're talking 3 orders of magnitude improvement
20:11 < docl> .wik Electrical_system_of_the_International_Space_Station
20:11 < saxo> "The electrical system of the International Space Station is a critical resource for the International Space Station (ISS) because it allows the crew to live comfortably, to safely operate the station, and to perform scientific experiments." - https://en.wikipedia.org/wiki/Electrical_system_of_the_International_Space_Station
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--- Log closed Sat Dec 25 00:00:11 2021