--- Log opened Tue Jan 29 00:00:34 2019
00:09 < nmz787> .title https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9985/998505/MBMW-101--Worlds-1st-high-throughput-multi-beam-mask/10.1117/12.2243638.short
00:09 < yoleaux> MBMW-101: World's 1st high-throughput multi-beam mask writer
00:10 < nmz787> "In these tools a multi-beam column provides 262-thousand programmable beams of 20nm beam size. The current density is adjustable up to 1 A/cm2, resulting in a total beam current of up to 1 μA. With the upgraded 120 Gbps data path full field 7nm node layouts can be printed in less than 10 hours."
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02:09 < archels> nmz787: not so much technical detail there, how did they achieve 262,000 parallel beams?
03:09 < fenn> " In 1972, meanwhile, a group of scientists called the Club of Rome released a controversial report on population size and world resources, called The Limits to Growth, that caught on among China’s elite.
03:10 < fenn> A few years later, Chinese leaders began deliberating tightening their birth directives into a one-child policy, which they formally unveiled in 1980. According to Shanghai Academy of Social Sciences economist Liang Zhongtang, who participated in debates about the policy’s adoption, the findings of The Limits to Growth—though widely criticized elsewhere—swayed some of the decisions in
03:10 < fenn> China."
03:10 < fenn> "Today, 12 percent of China’s population is over age 60, with a paucity of young people to provide economic and social support. China’s working-age adults are unlikely to spark the hoped-for baby boom, because they include tens of millions of men who cannot find women to marry. There are 62 million  “missing” women and girls in China from sex-selective abortion and neglect"
03:14 < fenn> “The masses will look at these diagrams and believe them, but I feel it’s dangerous to speak of projections so far ahead. If we feed the decision makers half-baked conclusions we can do great harm.” Another critic said that “this is not a decision-making model,” urging substantial refinements. But such views were in the minority.
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13:39 < nmz787> archels: I'd guess very even magnetic flux in the lenses, and possibly just a simple 512x512 grid of apertures
13:42 < archels> wait this is e-beam lithography, right?
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19:15 < fenn> let's just clone a few dozen million of her: http://youtu.be/LTejJnrzGPM
19:16 < fenn> li ziqi
19:26 < fenn> or is it li zikai
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21:50 < nmz787> archels: yup
21:52 < nmz787> archels: e/i beam instruments generally use apertures to limit the current hitting the sample, since I guess the only other option would be to change the resistance of the tip/emitter without changing the voltage which would require a geometrical change in the emitter... which is not interesting because it would be a lot more finicky to recalibrate than just getting a good servo mechanism with
21:52 < nmz787> encoder to position a given aperture that's in an aperture strip
21:52 < nmz787> but I don't really know anything much about the parallel writers... but it does seem like they mention parallel, not independent
21:54 < nmz787> plus fenn posted an article about magnetic sensing in humans, and they mentioned some coils that have very even flux density... so I just kinda assume that fancy coils and an aperture allow all such parallel beams to be evenly powerful and controlled in a coordinated fashion
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23:02 < fenn> .wik rogowski coil
23:02 < yoleaux> "A Rogowski coil, named after Walter Rogowski, is an electrical device for measuring alternating current (AC) or high-speed current pulses.  It consists of a helical coil of wire with the lead from one end returning through the centre of the coil to the other end, so that both terminals are at the same end of the coil." — https://en.wikipedia.org/wiki/Rogowski_coil
23:05 < fenn> .wik helmholtz coil
23:05 < yoleaux> "A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz. It consists of two electromagnets on the same axis." — https://en.wikipedia.org/wiki/Helmholtz_coil
23:06 < fenn> don't name things after dead guys
23:07 < fenn> .wik maxwell coil
23:07 < yoleaux> "A Maxwell coil is a device for producing a large volume of almost constant (or constant-gradient) magnetic field. It is named in honour of the Scottish physicist James Clerk Maxwell." — https://en.wikipedia.org/wiki/Maxwell_coil
23:07 < fenn> "in operation it provides an even more uniform magnetic field (than a Helmholtz coil), but at the expense of more material and complexity"
23:10 < fenn> "A constant-field Maxwell coil set consists of three coils oriented on the surface of a virtual sphere"
23:10 < fenn> why not go all the way to a sphere
23:13 < fenn> .title http://iopscience.iop.org/article/10.1088/0950-7671/43/7/311/meta
23:14 < yoleaux> Spherical coils for uniform magnetic fields - IOPscience
23:14 < fenn> "Comparison with the Helmholtz coil array shows that a suitably designed spherical coil carrying 100 turns of wire is equivalent to a Helmholtz coil system having a radius more than seven times greater."
23:27 < nmz787> so I'm thinking of moving to Boise Idaho and starting a PhD in Materials Science with a team that does nanomaterials (including nanofab) and is part of a newly formed Nucleic Acid Memory Institute...
23:28 < nmz787> anyone care to talk me out of such an idea?
23:28 < nmz787> or encourage...
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--- Log closed Wed Jan 30 00:00:35 2019