First Cut at Glossary

Discuss how polywell fusion works; share theoretical questions and answers.

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KitemanSA
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First Cut at Glossary

Postby KitemanSA » Wed Apr 15, 2009 3:48 am

Last edited by KitemanSA on Thu Apr 16, 2009 2:22 am, edited 1 time in total.

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Postby MSimon » Wed Apr 15, 2009 3:17 pm


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Postby 93143 » Wed Apr 15, 2009 5:58 pm


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Postby TallDave » Wed Apr 15, 2009 10:14 pm


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Postby TallDave » Wed Apr 15, 2009 10:15 pm


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Postby KitemanSA » Wed Apr 15, 2009 11:53 pm


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Postby TallDave » Thu Apr 16, 2009 12:18 am


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Postby KitemanSA » Thu Apr 16, 2009 2:02 am


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Postby KitemanSA » Thu Apr 16, 2009 2:23 am


TallDave
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Postby TallDave » Thu Apr 16, 2009 3:07 pm


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Postby 93143 » Thu Apr 16, 2009 5:40 pm

The Maxwellian in velocity space is a normal distribution around ZERO. In all three axes (u, v, and w). The width of the distribution is proportional to temperature.

A "drifting Maxwellian" is a normal distribution around a nonzero average velocity (eg: a cylinder of gas on a moving train). In the acceleration region of a Polywell, neglecting partial relaxation due to high-energy collisions, you have two drifting Maxwellians going in opposite directions.

The cross section for collisions goes down as relative velocity increases, so this situation doesn't instantly self-destruct, because the superimposed distributions preferentially collide with themselves rather than each other. If the superimposed-drifting-Maxwellians state were the only one in the system, this would only delay the inevitable...

The Maxwellian in speed is a skewed distribution, because it has to pass through the origin - what, after all, are the odds of a particle being completely at rest in a gas at a finite temperature?


The way the entry is formulated at the moment strikes me as... clunky. I'm not sure what to do about it right now...

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Postby MSimon » Thu Apr 16, 2009 6:36 pm


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Postby KitemanSA » Fri Apr 17, 2009 1:30 am

So, aside from the "Maxwellian" definition, are we mostly happy with the others? If so, I will insert them in the FAQwiki.

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Postby TallDave » Fri Apr 17, 2009 6:18 pm


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Postby KitemanSA » Sat Apr 18, 2009 2:54 pm



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