Synthetic diamond: excellent hard x-ray reflector

Discuss the technical details of an "open source" community-driven design of a polywell reactor.

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DeltaV
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Synthetic diamond: excellent hard x-ray reflector

Postby DeltaV » Tue Aug 23, 2011 5:58 pm


quixote
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Postby quixote » Tue Aug 23, 2011 9:24 pm


hanelyp
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Postby hanelyp » Wed Aug 24, 2011 1:35 am

Reflecting the x-rays back is of little use for lowering losses unless the plasma absorbs the x-ray and the plasma is thermal. Neither applies to the polywell. Only the latter would apply for a tokomak. In both devices the plasma is thin enough for light of visible or shorter wavelength to pass through with little absorption.

quixote
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Postby quixote » Wed Aug 24, 2011 1:50 am

darn.

Thanks for clearing that up for me, hanelyp.

DeltaV
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Postby DeltaV » Thu Aug 25, 2011 3:57 am

There must be some applicability of CVD diamond x-ray reflectors to LPP's work.
http://focusfusion.org/index.php/site/a ... easibility

quixote
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Postby quixote » Thu Aug 25, 2011 8:40 am


ladajo
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Postby ladajo » Thu Aug 25, 2011 1:33 pm


93143
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Postby 93143 » Fri Aug 26, 2011 8:23 am

You'd need a lot less shielding (neglecting the gamma rays and neutrons). Just put the diamond layers (you'd need more than one) on the outside of the vacuum vessel, and the x-rays will attenuate passing through the metal. (Assuming this works with the bremsstrahlung spectrum you'd get from a Polywell; the paper's idea of "hard" X-rays seems to be 23.7 keV...) Neutron exposure might screw with the mirrors' effectiveness, so they'd need to be outside a pretty solid neutron shield too...

I very much doubt this will work with gammas, though, so if those gammas really do show up they will still dominate the shielding requirements.

However, a hard X-ray mirror is still a very impressive development, and as ladajo notes is still useful for building death rays... sorry, X-ray lasers...

ladajo
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Postby ladajo » Fri Aug 26, 2011 1:37 pm

Well, I admittently wasn't thinking the word DeathRay, when I posted that, but maybe I did have visions of ships, aircraft and missiles vaporizing into clouds of pretty colors... :D

But seriously, this will more than likely add another significant dimension to potential FEL applications, which are many.


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