Z-Pinch Renaissance

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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Skipjack
Posts: 5978
Joined: Sun Sep 28, 2008 2:29 pm

Re: Z-Pinch Renaissance

Postby Skipjack » Mon Apr 15, 2019 3:27 am

Well, the FuZE prototype is really small. The expensive part is the experiments right now. Once they worked out the kinks, these things should be really cheap to mass produce. May be not as cheap as a fusor, but they will (hopefully) produce a lot more neutrons.

crowberry
Posts: 474
Joined: Sun Sep 08, 2013 6:34 am

Re: Z-Pinch Renaissance

Postby crowberry » Wed Apr 17, 2019 1:09 pm

Ivy Matt wrote:I wonder what the relative difficulty/cost of getting fusion neutrons from a Z-pinch machine is compared to getting them from a Hirsch-Farnsworth fusor. Is there any other confinement concept for which the barrier to entry is as low (or nearly so) as the fusor? (An accelerator, perhaps, but that's not really a confinement concept.)


A DPF device could also be rather small and inexpensive. The plasmoid confines itself for a very short time and can give neutron pulses:

Palm top plasma focus device as a portable pulsed neutron source

Development of a palm top plasma focus device generating (5.2 ± 0.8 ) × 10^4 neutrons/pulse into 4π steradians with a pulse width of 15 ± 3 ns is reported for the first time. The weight of the system is less than 1.5 kg. The system comprises a compact capacitor bank, a triggered open air spark gap switch, and a sealed type miniature plasma focus tube. The setup is around 14 cm in diameter and 12.5 cm in length. The energy driver for the unit is a capacitor bank of four cylindrical commercially available electrolytic capacitors. Each capacitor is of 2 μF capacity, 4.5 cm in diameter, and 9.8 cm in length. The cost of each capacitor is less than US$ 10. The internal diameter and the effective length of the plasma focus unit are 2.9 cm and 5 cm, respectively. A DC to DC converter power supply powered by two rechargeable batteries charges the capacitor bank to the desired voltage and also provides a trigger pulse of −15 kV to the spark gap. The maximum energy of operation of the device is 100 J (8 μF, 5 kV, 59 kA) with deuterium gas filling pressure of 3 mbar. The neutrons have also been produced at energy as low as 36 J (3 kV) of operation. The neutron diagnostics are carried out with a bank of 3 He detectors and with a plastic scintillator detector. The device is portable, reusable, and can be operated for multiple shots with a single gas filling.


http://dx.doi.org/10.1063/1.4808309


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