diy Gyrotrons?

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So we currently have gamma-spectrometry communities, and hobbyist Lenard tu
bes with e-beams in air.   But no diy Gyrotrons as yet?   (It's like buildi
ng a laser, but for 100GHz microwave.  Early 1980s tech.  The physics-hobby
ists are not on the ball!

The SEM-builders and the Farnsworth Fusor communities could team up to make
 some insect-frying EM weapons, to clear certain skies of locust-swarms (he
h, toasted grasshoppers, ready for harvesting.)    Get a small plane, and b
eam some complicated artwork onto new crops of wheat?

These appear to contain some plans...  https://scholar.google.com/scholar?q
=%22SG+Kim%22+%22W-band+gyrotron%22


Re: diy Gyrotrons?
On Saturday, February 27, 2021 at 11:15:46 AM UTC+11, Bill Beaty wrote:
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tubes with e-beams in air. But no diy Gyrotrons as yet? (It's like building
 a laser, but for 100GHz microwave. Early 1980s tech. The physics-hobbyists
 are not on the ball!  
Quoted text here. Click to load it
ke some insect-frying EM weapons, to clear certain skies of locust-swarms (
heh, toasted grasshoppers, ready for harvesting.) Get a small plane, and be
am some complicated artwork onto new crops of wheat?  
Quoted text here. Click to load it
q=%22SG+Kim%22+%22W-band+gyrotron%22

Electron beams don't go all that far in air. We seems to have had laser-zap
ping project for mosquitos here at one point. which could have worked, but  
it seems that it would have needed Star Wars level lasers with built-in cor
rection for the self-defocussing effects of high-powered laser beams in air
, which wouldn't have been remotely cost effective.

--  
Bill Sloman, Sydney

Re: diy Gyrotrons?
On Friday, February 26, 2021 at 8:43:35 PM UTC-8, Bill Sloman wrote:

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Then good thing that this is about microwave sources.  "Gyrotron" is good f
or hundreds GHz, apparently behaves almost like thermal IR.    Heh, portabl
e megawatt gyrotron,  isn't that the ray-projector carried by HG Wells' Mar
tian invaders?  It might even make SF sound effects, if the PS switcher end
s up in the beam, making Flash Gordon raygun noises by ambient water vapor  
in the beam path.

But no hobbyists built one?   Many built pulsed N2 TEA, and hundreds-watt c
w CO2 w/rf drive, even hand-blown HeNe lasers back in the day.   Gyrotrons  
look a bit simpler.   Plus, they're an excellent excuse for digging out tha
t old high-watts HV Fusor power supply, that some of us still have in our b
asements.


Re: diy Gyrotrons?
On a sunny day (Fri, 26 Feb 2021 16:15:43 -0800 (PST)) it happened Bill Beaty

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About gyrotron:
 https://en.wikipedia.org/wiki/Gyrotron
Used to target humans:
 https://en.wikipedia.org/wiki/Active_Denial_System

  

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