Re: Is a Purely magnetic (NO CABLING) Space elevator possibl
Posted: Fri Dec 12, 2014 1:32 am
Mmm...
FuFu as an electron injector for a Polywell. It seems strange on first thought, but if DPF "FuFu" can produce a high intensity collimated electron beam frequently enough for for a pulsed Polywell, and do so while near breakeven even from X-ray direct conversion and ion beam direct conversion, the energy balance picture changes. Even with poor electron injection efficiency into the Polywell the energy cost of injecting electrons is minimal, or even slightly profitable. A strange hybrid might actually make physics sense. The engineering would be daunting, but the concept may not be that much different from using a FRC for plasma injection. The FuFu electron beam injector may not even be much bigger than the e-gun already on WB 8, especially as they would have to be beefed up a lot to reach required output. The electron beam from a FuFu might be too energetic, but it could be partially direct converted- slowed to desired KeV with the benefit of harvesting more of FuFu output for electricity generation.
Lets see. If a DPF manages to produce ~ 4 MJ per pulse, and if ~ 500KJ of that is in the electron beam, and it pulses ~ 100 times per second/ per FuFu gun, then 50 MW (Mega Joules per second) or more of electron input power could be available.
The DPF might be a failure at producing net profitable power, but an overall Q of 0.5 would still make it an excellent and energy cheap electron injector for a Polywell (assuming the Polywell is a profitable machine). The essentially two stage fusion approach might make the two marginal machines a cooperative success.
Mmm....
PS: Polywell , FRC, and DPF are the three primary alternate fusion approaches. Of course General Fusion, and Laser fusion is ignored in this speculation. It would be ironic if major componets of all three systems end up providing a solution that dethrones the tokamak.
Dan Tibbets
FuFu as an electron injector for a Polywell. It seems strange on first thought, but if DPF "FuFu" can produce a high intensity collimated electron beam frequently enough for for a pulsed Polywell, and do so while near breakeven even from X-ray direct conversion and ion beam direct conversion, the energy balance picture changes. Even with poor electron injection efficiency into the Polywell the energy cost of injecting electrons is minimal, or even slightly profitable. A strange hybrid might actually make physics sense. The engineering would be daunting, but the concept may not be that much different from using a FRC for plasma injection. The FuFu electron beam injector may not even be much bigger than the e-gun already on WB 8, especially as they would have to be beefed up a lot to reach required output. The electron beam from a FuFu might be too energetic, but it could be partially direct converted- slowed to desired KeV with the benefit of harvesting more of FuFu output for electricity generation.
Lets see. If a DPF manages to produce ~ 4 MJ per pulse, and if ~ 500KJ of that is in the electron beam, and it pulses ~ 100 times per second/ per FuFu gun, then 50 MW (Mega Joules per second) or more of electron input power could be available.
The DPF might be a failure at producing net profitable power, but an overall Q of 0.5 would still make it an excellent and energy cheap electron injector for a Polywell (assuming the Polywell is a profitable machine). The essentially two stage fusion approach might make the two marginal machines a cooperative success.
Mmm....
PS: Polywell , FRC, and DPF are the three primary alternate fusion approaches. Of course General Fusion, and Laser fusion is ignored in this speculation. It would be ironic if major componets of all three systems end up providing a solution that dethrones the tokamak.
Dan Tibbets