/sci/ - Science & Math

There was some SQL trouble earlier today
so this is in response to
Anonymous Wed Dec 30 19:13:17 2015 No.7752677
>any info on 'proprietary filters'?

two kinds of polycarbonates they say
bookmark & save the following page
rexresearch.com/cornwell/cornwell.htm
there's more to it than just filters

To generate the Unstoppable Microwave you have your pulsed magnetron produce a circular microwave, send it through a polarizer into a matched horn antenna terminated by a group of crossed polarizers. Or something like that.

Normally you wouldn't expect much to come out of such a contraption but what does come out is a creature able to penetrate all known shields and wreak havoc on electronics.

Don't do this at home...

>>6939259
1. No. EMP work by using a strong pulse fluctuating electromagnetic fields - radio waves, basically - to induce currents in wires as though they were antennas. This can fry components, like electronics, that are sensitive to these voltage surges.

A flashlight, on the other hand, pretty much just contains a lightbulb, a switch, and a battery - none of which are particularly sensitive even to very large fluctuations of a few volts. It won't give a shit. An EMP powerful enough to zorch a flashlight would have other, far more noticeable effects - it would essentially be like sticking everything in range inside a microwave oven.

2. No. However, there are pulsed events that can come close - see, for instance, the Carrington event, which could fry the electrical grid of a whole hemisphere if it reoccurred. However, it would not shut down small electronics - the disruption (thought quite large) would be mostly felt in very long antennas like power lines, and small handheld devices like cellphones would very likely survive. And also, these events are quite rare, and absolutely could not happen in a constant, long-term stream.

>>6939220
>-How exactly was it determined that the stellarator is the "optimal" shape for fusion? What does that mean, in quantitative terms?
first of all, TYBG, nobody on /sci/ ever knows shit about fusion, let alone stellarators. it's not that they're the best shape, but they exhibit some really great plasma phys and topology. for one, they aren't subject to the nasty E x B drift that tokamaks are subject to, and they are inherently steady state devices, whilst tokamaks are inherently pulsed devices. but the plasma phys and transport theories are much more difficult than in tokamaks due to the helical winding of external coils.

as for modeling, I can only say that there are 3 different ways of looking at it. my professor always likes to say that plasma wears 3 different hats. a fluids hat (MHD), a particle hat (treatment of ions/electrons as particles), and a wave hat (treatment of ions/electrons as waves). they all have purposes/advantages. MHD will help determine bulk plasma behavior and plasma instabilities, particle treatment can be used to determine banana orbits and diffusion rates (which can be useful in determining bootstrap current), and wave nature can be very useful in determining the coupling of wave/microwave systems for plasma heating/current drive. relativistic effects aren't that significant, at least for ions (with velocities on the order of 10^5 m/s) whereas electrons may have velocities on the order of 10^7 m/s). there are of course momentum equations similar to navier stokes, just solved in terms of plasma denisty and such, not in the same respect as regular fluids.

>This is actually a thing
http://en.wikipedia.org/wiki/Microwave_auditory_effect

>The microwave auditory effect, also known as the microwave hearing effect or the Frey effect, consists of audible clicks (or, with speech modulation, spoken words) induced by pulsed/modulated microwave frequencies. The clicks are generated directly inside the human head without the need of any receiving electronic device.

OK, /sci/, how do I build one and use it to fuck with people?

Most of them use a harmless microwave communicator but 1 in every 100,000 has that replaced with a high energy pulsed gamma source. You can tell if you're being irradiated by a rogue unit if you feel sleepy after eating a large meal, get a headache sometimes or wake up occasionally still feeling tired. Other signs include muscular pain after intense exercise and feeling slightly itchy for no specific reason.

>>6262500
>conically focused
Seriously?

Not sure how these things are made, but if it's anything as you've described, it has to do with non-linear absorption of radiation. That means you have a pulsed laser (i.e. very intense for a short period) and you tightly focus it. This leads to very high electromagnetic field in the focus, which leads to multi-photon and avalanche ionization. Using a wavelength to which the substrate is transparent, e.g. IR in glass, you can get absorption only at the focal point. Voila.

X-rays will not heat the food. Microwaves will. They are on the other side of the ER spectrum from the visible light. For this to work, you will have to first design a microwave that can deliver short and powerful pulses, probably no longer than a nanosecond, picosecond more likely. Then you will have to focus it. The caveat here is that microwaves have a long wavethength (10cm or so), which means you can't focus it much smaller than that. So to get a proper power boost from focusing, which is usually 10^6 (mm-->um with IR) you will need to start with a microwave beam 100m across.

Having said that, your microwave would be the size of a house and cost $10M. You best stick to just mixing your food or letting the heat even out after you nuke it.

Trust me, I did a PhD in this shit.

>RF
RF Circuit Design
Chris Bowick
ISBN:0750685182
Good intro/overview of radio ciruits, provides enough information to start looking
at more definitive books.
If you really like RF, look up all the books authored by Wes Hayward and Doug DeMaw

>Microwave Engineering - Think Electromagnetics applied to circuits, gigahertz frequencies., etc.
Microwave Engineering
David M. Pozar
ISBN: 0470631554
Currently reading this, good resource introduction to Microwave Engineering

The Design of CMOS Radio-Frequency Integrated Circuits
Thomas H. Lee
ISBN:0521835399

>Power Systems
Power System Analysis and Design, Fifth Edition
J. Duncan Glover, Mulukutla S. Sarma , Thomas Overbye
ISBN: 1111425779
Good resource on Power Systems, which most course don't really go over unless you delliberately go for it.
This explains why we use 3-Phase AC systems, why we even use AC, why reactive power is bad, etc.

>Power Electronics
Power Electronics: Converters, Applications, and Design
Ned Mohan, Tore M. Undeland, William P. Robbins
ISBN:0471226939
Good overview of Power Electronics, explains alot of the reasons why we use switch-mode power electronics.

Switch-Mode Power Supplies Spice Simulations and Practical Designs
Christophe Basso
ISBN:0071508589
Great resource on Switch-Mode Power Supplies, good information with an author with a background in the industry.

Most of these are Senior-level concepts and books, but you should be able to learn all the basic concepts of the book.
I didn't bother putting in VLSI or Pulsed Power books, list would become too long.

/sci/,
Is it possible to fry human internal organs/brains with microwaves from three or four conventional microwave oven magnetrons? Just seeing this as a precaution before I start some pulsed HERF experimentation.
pic related.
Thanks!