The consequences of quasi-neutrality in the cusps

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

Moderators: tonybarry, MSimon

rnebel
Posts: 144
Joined: Mon Dec 24, 2007 12:15 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby rnebel » Mon Feb 09, 2009 8:46 pm


icarus
Posts: 819
Joined: Mon Jul 07, 2008 12:48 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby icarus » Mon Feb 09, 2009 9:19 pm


Art Carlson
Posts: 794
Joined: Tue Jun 24, 2008 7:56 am
Location: Munich, Germany
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby Art Carlson » Mon Feb 09, 2009 9:33 pm


Art Carlson
Posts: 794
Joined: Tue Jun 24, 2008 7:56 am
Location: Munich, Germany
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby Art Carlson » Mon Feb 09, 2009 9:39 pm

This may be the most interesting problem I have come across since I have been hanging out here. I thought Bohm was going to get my back, but it turns out he was relying heavily on Boltzmann, who is persona non grata here. I thought I could whip up a substitute theory on the basis of monoenergetic ions and electrons (plus a few extras later on), but it turns out that there is no solution to the sheath problem under those conditions. (Nota Bene, no solution at all, not simply one I don't like.)

Actually the Bohm condition arises in a similar way. One asks what the sheath structure should be, given the ion velocity, and one discovers that there is no solution unless V_i >= c_s. Physically, you might set up a situation with V_i < c_s, thinking nature will surely think of something to do. What occurs to nature is to let the sheath eat back into the plasma to provide a potential hill to accelerate the ions to the speed they need to have when entering the real sheath. This hill, known as the "pre-sheath", is closely related to the particle sources, which we were trying to ignore.

It could be that the sheath in this case will have some long range effects that end up broadening the electron energies so they are no longer so pathologically narrow.

I could retreat to my conviction that the electrons will be Maxwellian, or I could be satisfied that nobody else has a good theory either. I have a bit more ambition than that, so I'll keep trying, but it may take a while.

icarus
Posts: 819
Joined: Mon Jul 07, 2008 12:48 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby icarus » Mon Feb 09, 2009 10:27 pm


rnebel
Posts: 144
Joined: Mon Dec 24, 2007 12:15 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby rnebel » Mon Feb 09, 2009 10:53 pm


Skipjack
Posts: 6051
Joined: Sun Sep 28, 2008 2:29 pm
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby Skipjack » Mon Feb 09, 2009 10:54 pm


icarus
Posts: 819
Joined: Mon Jul 07, 2008 12:48 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby icarus » Mon Feb 09, 2009 11:36 pm


MSimon
Posts: 14331
Joined: Mon Jul 16, 2007 7:37 pm
Location: Rockford, Illinois
Contact:

Postby MSimon » Tue Feb 10, 2009 12:33 am


hanelyp
Posts: 2255
Joined: Fri Oct 26, 2007 8:50 pm
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby hanelyp » Tue Feb 10, 2009 6:36 am


Art Carlson
Posts: 794
Joined: Tue Jun 24, 2008 7:56 am
Location: Munich, Germany
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby Art Carlson » Tue Feb 10, 2009 10:01 am


rnebel
Posts: 144
Joined: Mon Dec 24, 2007 12:15 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby rnebel » Tue Feb 10, 2009 6:17 pm


dch24
Posts: 142
Joined: Sat Oct 27, 2007 10:43 pm
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby dch24 » Tue Feb 10, 2009 7:49 pm

whispering starts that the latest WB7 data is getting out

just kidding :lol:

icarus
Posts: 819
Joined: Mon Jul 07, 2008 12:48 am
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby icarus » Tue Feb 10, 2009 9:04 pm


Art Carlson
Posts: 794
Joined: Tue Jun 24, 2008 7:56 am
Location: Munich, Germany
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Postby Art Carlson » Tue Feb 10, 2009 9:35 pm



[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1236: count(): Parameter must be an array or an object that implements Countable

Return to “Theory”

Who is online

Users browsing this forum: No registered users and 3 guests