Nice.randomencounter wrote:I think you fail to understand the gravity of the situation.303 wrote:the sun , works pretty good , without aid of machinery or engineering
It would seem he is missing the depth as well.
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Nice.randomencounter wrote:I think you fail to understand the gravity of the situation.303 wrote:the sun , works pretty good , without aid of machinery or engineering
A D-D or PB&J Polywell (as we know it) would most certainly fit in a Perry Class FFG Main Engine Room volume. As I demonstrated long ago in a thread far far away.Dr. B mentioned a 1.5m radius 100MW DD machine and a 2m radius pB11 machine, so I guess my "shipping container" statement isn't precisely true, but the volume is about right.
-Jospehexcept that the confining force in Polywell (electro-statics) is many orders of magnitude stronger than the force (gravity) in the sun so Polywell can be many orders of magnitude smaller too.
Recently we had discussion on thermalization. My point is that at 10T big amount of alphas will be trapped together with electrons thermalizing then entire system. So, stronger field - faster thermalization. Certainly if Polywell will ever reach the significant fusion rate.93143 wrote:Last I heard, EMC2's preliminary powerplant designs were around 10 T.Joseph Chikva wrote:As when I have repeated Dan's "10^22 at 10 T" Ladajo objected me saying that B should not be higher 2T for commercial reactor.
The Polywell has cusps. Even in wiffleball mode, the cusps appear fairly large to something with the energy of a fusion alpha. They rattle around for ~1e3 passes and then leave. The number density never gets very high.Joseph Chikva wrote:Recently we had discussion on thermalization. My point is that at 10T big amount of alphas will be trapped together with electrons thermalizing then entire system.93143 wrote:Last I heard, EMC2's preliminary powerplant designs were around 10 T.Joseph Chikva wrote:As when I have repeated Dan's "10^22 at 10 T" Ladajo objected me saying that B should not be higher 2T for commercial reactor.
...No. Absolutely impossible. Magnetic fields do not work that way.303 wrote:we cant simulate gravity confinement with magnetic fields ?
Somewhere in this board Art Carlson asked to Nebel: "Rick, from where are you saying about passes numbers of particles?"93143 wrote:The Polywell has cusps. Even in wiffleball mode, the cusps appear fairly large to something with the energy of a fusion alpha. They rattle around for ~1e3 passes and then leave. The number density never gets very high.
rnebel wrote:these devices are non-ignited (i.e. very little alpha heating) since the alpha particles leave very quickly through the cusps.
I know that Dr. Nebel is the source. But I have also read the question of Dr. Carlson. And could not find the answer then. My question only how well stated are these numbers: electrons pass inside X times before escaping, alphas - Y times. May be or not that those are only assumptions stated with nothing. May be or not that 3-men strength team from which only Nebel is theoretist can investigate all issues? Do you think that Polywell's theory less labor intensive than e.g. TOKAMAK?93143 wrote:Rick Nebel is the source. He knows as well as anyone that it isn't trivial, and at the time the statement was made he probably knew more about Polywell than any other living man.
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If you don't believe him, well, that's your call to make. EMC2 has done a lot of simulation in addition to the experiments and has worked notional reactor designs, and I don't think Dr. Nebel would have said that if he didn't have good reason to believe it was true.
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It may be noted that the above is separate from the question of whether the alphas will be there long enough to significantly thermalize the plasma. However, there too we have information from Dr. Nebel, who declared that neutronicity will be about 8 orders of magnitude down from that of a neutronic power plant. Thermal p-¹¹B is only 3 orders down. That should give you some idea of the alpha rarefaction factor, since the alphas are involved in the primary neutron-producing reaction.
Maybe. A Polywell is a magnetohydrodynamically stable driven beam machine, and if either me or MSimon is correct the internal structure of the plasma exhibits self-organizing properties (he calls it beam bunching, as in a klystron; I call it the Langmuir onion, even though I didn't know what Langmuir waves were when I came up with the idea - something similar can be seen in the POPS work, and in the formation of a multiple well structure in a Japanese fusor). Contrast with the tokamak, where the fundamental magnetohydrodynamic instability is countered with an internal plasma current that can itself go unstable...Joseph Chikva wrote:Do you think that Polywell's theory less labor intensive than e.g. TOKAMAK?
And may not. As klystrons or any other vacuum tubes run at larger Debye length. And so, there we have the beams of separate particles, while for Polywell we have plasma. Rather dense plasma at 10T B-field.93143 wrote:Maybe. A Polywell is a magnetohydrodynamically stable driven beam machine, and if either me or MSimon is correct the internal structure of the plasma exhibits self-organizing properties (he calls it beam bunching, as in a klystron; I call it the Langmuir onion, even though I didn't know what Langmuir waves were when I came up with the idea - something similar can be seen in the POPS work, and in the formation of a multiple well structure in a Japanese fusor). Contrast with the tokamak, where the fundamental magnetohydrodynamic instability is countered with an internal plasma current that can itself go unstable...Joseph Chikva wrote:Do you think that Polywell's theory less labor intensive than e.g. TOKAMAK?
But I think it's beside the point. Alpha confinement is a first-order calculation. Given a working wiffleball mode, it should be fairly simple to calculate the approximate lifetime of an alpha in the plasma, and collision cross section is not a thousand-man job.