Why people are so optimistical to Polywell?

[Joseph Chikva]

As DanT suggested, the ions are very cold when they reach the magnetic field

Can you explain me at the expense of what ions would be cold?
Do they not collide each other in the core of reactor?
Will every collision be a fusion event?

[chrismb]

Will every collision be a fusion event?

You should know the answer to that question for yourself, from the effort I put in trying to teach you and get you to read and think about it.

[Joseph Chikva]

Will every collision be a fusion event?

You should know the answer to that question for yourself, from the effort I put in trying to teach you and get you to read and think about it.

Thanks for your efforts. And I am always open for learning.
But unfortunately you are late this time.

In case of my concept there are forces returning scattered particles on the axis and also relativistic electrons beam getting radial thermal energy and then radiating it. Also there is an externally applied electric field compensating the alignment of relative velocities of particles in different beams caused by particles’ elastic collisions.

In case of Polywell I do not see any mechanism to avoid thermalization.

[Giorgio]

In case of Polywell I do not see any mechanism to avoid thermalization.

D Tibbets gave you a reply in page2 of this thread.
viewtopic.php?p=60058
Of course it still needs to be proven experimentally.

[Joseph Chikva]

In case of Polywell I do not see any mechanism to avoid thermalization.

D Tibbets gave you a reply in page2 of this thread.
viewtopic.php?p=60058
Of course it still needs to be proven experimentally.

Thank you. May be I missed something. Though after some reading now I mean that already understand mainly the Polywell's concept.
There is too long text. May you please give me a quote regarding only the thermalization?

[Giorgio]

In case of Polywell I do not see any mechanism to avoid thermalization.

D Tibbets gave you a reply in page2 of this thread.
viewtopic.php?p=60058
Of course it still needs to be proven experimentally.

Thank you. May be I missed something. Though after some reading now I mean that already understand mainly the Polywell's concept.
There is too long text. May you please give me a quote regarding only the thermalization?

The theory is stating that thermalization will be avoided through:
1) The formation of the wiffleball plasma that will allow for 1,000 fold increase in density.
2)Thanks to the escape from the cusps of the thermalizing electrons that should be captured, reconverted to monoenergetic and re-injected back into the system.

Without these two processes the Polywell has little to no hope of working as predicted.

[Joseph Chikva]

The theory is stating that thermalization will be avoided through:
1) The formation of the wiffleball plasma that will allow for 1,000 fold increase in density.
2)Thanks to the escape from the cusps of the thermalizing electrons that should be captured, reconverted to monoenergetic and re-injected back into the system.

Without these two processes the Polywell has little to no hope of working as predicted.

I do not know which theory is stating that by increasing the density you will decrease thermalization. Theory with which I familiar says that by increasing of number density 1,000 fold, you will get 1,000,000 fold more collisions frequency.
As I see exactly you are familiar with another seniora (theory)

[Giorgio]

The theory is stating that thermalization will be avoided through:
1) The formation of the wiffleball plasma that will allow for 1,000 fold increase in density.
2)Thanks to the escape from the cusps of the thermalizing electrons that should be captured, reconverted to monoenergetic and re-injected back into the system.

Without these two processes the Polywell has little to no hope of working as predicted.

I do not know which theory is stating that by increasing the density you will decrease thermalization. Theory with which I familiar says that by increasing of number density 1,000 fold, you will get 1,000,000 fold more collisions frequency.

The idea is to increase the density inside the wiffleball, while keeping it low on the outside.
Talldave posted quite a good explanation from Rick nebel at page3:

You might find this comment by Rick enlightening.

viewtopic.php?p=4940&highlight=62500#4940

The best analogy that I can think of is that the wiffleball mode is the jet engine and the ion convergence is the afterburner. The 2.5e22/m**3 density is what the Polywell should have on the edge, and then it hopefully goes up a few orders of magnitude as it goes into the interior. I don’t mean to imply that ion convergence isn’t important. This power density boost is what enables the Polywell to be built in small attractive unit sizes and to easily use advanced fuels.
However, the wiffleball mode is essential and the ion convergence simply makes things better. If we can’t get the wiffleball, then we can kiss our behinds goodbye. That’s why we are focused on achieving the wiffleball and we aren’t paying any attention to Rider and Nevins. They’re just a distraction. Does this kind of make sense?

In case you didn't read it before this paper from Joel Rogers is also a good source of info:
http://www.plasma.ee.kansai-u.ac.jp/iec ... ogers2.pdf

[Joseph Chikva]

The idea is to increase the density inside the wiffleball, while keeping it low on the outside.

The idea is to increase the density is attractive in any case. Because that allows to increase the power tapping from volume unit (as square). So, much smaller size of reactor. Not bad in any case.

But as I have said above, thermalization will increase as square as well or in the other words proportionally to target reaction.
So, if you could not reach breakeven at 10^19 m^-3 density no doubt you will not have success at 10^22 too.

Why not? I have hypothesis that already sounded it once. One more time:
Because of instabilities that would be the main originator of particles losses, then by colliding with walls secondary emission of heavy ions will observed, then dramatically increasing of braking radiation.

[Giorgio]

I am not sustaining that it will work. I was just replying to your request to understand what mechanism (in theory) would have avoided thermalization in a Polywell.

That said, the only real way to actually verify whose hypothesis is correct is to get some real info from a working prototype.

Until we have those data all of our ideas can generate some nice discussions, but they will remain plain speculations.

[Joseph Chikva]

Until we have those data all of our ideas can generate some nice discussions, but they will remain plain speculations.

One more time about injecting of electrons into background plasma:

Electron Beam Plasma Instability
...This initial configuration is unstable to an electrostatic plasma wave which grows by tapping the free energy of the electron beam. At early times, the unstable waves grow exponentially...

The full text you can read here: http://www.netlib.org/utk/lsi/pcwLSI/text/node180.html[/quote]

But here people hope that next WB-8 will reach the density of 10^22 m^-3 explaining me beta=1, B=10T.
I also trust in God and and in miracles.

[KitemanSA]

As DanT suggested, the ions are very cold when they reach the magnetic field

Can you explain me at the expense of what ions would be cold?
Do they not collide each other in the core of reactor?
Will every collision be a fusion event?

Whatever collisions occur near the center of the volume, the resulting fuel ion must then climb up the potential well, converting kinetic energy into potential energy and becoming quite cold. Simple, no?

[Joseph Chikva]

Whatever collisions occur near the center of the volume, the resulting fuel ion must then climb up the potential well, converting kinetic energy into potential energy and becoming quite cold. Simple, no?

And I suffered with the question: why soup has cooled in my pan?

[KitemanSA]

In case of Polywell I do not see any mechanism to avoid thermalization.

D Tibbets gave you a reply in page2 of this thread.
viewtopic.php?p=60058
Of course it still needs to be proven experimentally.

Thank you. May be I missed something. Though after some reading now I mean that already understand mainly the Polywell's concept.
There is too long text. May you please give me a quote regarding only the thermalization?

AFAIK, the primary force against thermalization is thermalization. See "Annealing" at this site:
http://www.ohiovr.com/polywell-faq/inde ... e#Glossary

[Joseph Chikva]

AFAIK, the primary force against thermalization is thermalization. See "Annealing" at this site:
http://www.ohiovr.com/polywell-faq/inde ... e#Glossary

Ok, thanks. I am heating my soup pan and in result that is cooling. Am I correct?