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Talk-Polywell.org • Z-Pinch Renaissance - Page 2
Page 2 of 8

Re: Z-Pinch Renaissance

Posted: Wed Jun 20, 2018 5:41 pm
by Munchausen

Re: Z-Pinch Renaissance

Posted: Thu Jun 21, 2018 12:38 am
by Skipjack
Great find!

Re: Z-Pinch Renaissance

Posted: Thu Jun 21, 2018 1:18 am
by Skipjack
Looks like they are getting there. Goals for FuZE are:
Radius =1 mm, density: n = 2 ×10^24 m-3, temperature: 2500 to 4000 eV at an input current of 300 kA.
So far they are at 1–2 keV, and densities of approximately 10^17 cm3 with a radius of 3 mm. This is already a good improvement over ZAP- HD and it looks like they will reach their goals once they continue to increase the input current and tweaking the other parameters.
From what I understand, they halted increasing the current and focused on diagnostics at 200 kA. One focus was to determine whether the detected neutrons were indeed all thermonuclear in nature. From this paper it looks like this is the case. So to the best of my understanding, FuZE is still looking good.

Re: Z-Pinch Renaissance

Posted: Wed Oct 17, 2018 1:02 pm
by Skipjack
7 papers on Uri Shumlak's Sheared Flow Stabilized Z- Pinch FuZE will be presented at the upcoming 60th Annual Meeting of the APS Division of Plasma Physics in November. Among them interesting topics like scaling the output up to reactor conditions and a paper on how it can be used as a propulsion system with high thrust and high Isp.

http://meetings.aps.org/Meeting/DPP18/Session/BM9.4
http://meetings.aps.org/Meeting/DPP18/Session/CP11.156
http://meetings.aps.org/Meeting/DPP18/Session/CP11.157
http://meetings.aps.org/Meeting/DPP18/Session/CP11.158
http://meetings.aps.org/Meeting/DPP18/Session/CP11.159
http://meetings.aps.org/Meeting/DPP18/Session/CP11.160
http://meetings.aps.org/Meeting/DPP18/Session/CP11.161
http://meetings.aps.org/Meeting/DPP18/Session/CP11.162
http://meetings.aps.org/Meeting/DPP18/Session/CP11.163
http://meetings.aps.org/Meeting/DPP18/Session/NI3.6

Updated the links above. It seems like schedule(?) changes messed up some of the links. Also seems like a couple of papers related to FuZE were added since the original post.

Re: Z-Pinch Renaissance

Posted: Sat Nov 03, 2018 10:29 pm
by Munchausen

Re: Z-Pinch Renaissance

Posted: Sun Nov 04, 2018 4:26 am
by Skipjack
That's the "staged Z- Pinch", not the "Sheared Flow Stabilized Z- Pinch", big difference there.
Never had that high of an opinion of the former. The latter however... I had a really good conversation with Uri Shumlak a few months ago and it looks to the layman me like this has a lot of potential. So far they have met all their ARPA-E milestones (one of few participants to do so) and they are not _that_ far off from achieving break even either. Doubling the input current from the current prototype (which is "only the most straight forward of several knobs they can turn" according to Uri), seems relatively trivial.

Re: Z-Pinch Renaissance

Posted: Tue Nov 06, 2018 1:50 am
by daveklingler
Well now. The space propulsion paper with the exhaust velocities of 1 x 10^7 have just up and disappeared. Another paper has appeared in its place.

That's pretty disappointing. Once again, the absence of any proof proves the conspiracy is real.

Re: Z-Pinch Renaissance

Posted: Tue Nov 06, 2018 7:59 am
by Skipjack

Re: Z-Pinch Renaissance

Posted: Tue Nov 06, 2018 8:18 am
by Skipjack

Re: Z-Pinch Renaissance

Posted: Tue Nov 13, 2018 6:48 am
by daveklingler

Re: Z-Pinch Renaissance

Posted: Tue Nov 13, 2018 1:28 pm
by Skipjack

Re: Z-Pinch Renaissance

Posted: Sat Nov 24, 2018 11:07 pm
by Skipjack

Re: Z-Pinch Renaissance

Posted: Wed Apr 10, 2019 8:02 pm
by Skipjack
Short presentation by Uri Shumlak at least year's ARPA-E Alpha Meeting:
Demonstrated Z- Pinch stability at 250 kA and continuous neutron production.
https://arpa-e.energy.gov/sites/default ... humlak.pdf

Also, they published a paper with their latest results:
https://arxiv.org/pdf/1806.05894.pdf

Re: Z-Pinch Renaissance

Posted: Thu Apr 11, 2019 1:01 pm
by Skipjack
Small article about the Sheared Flow Stabilized Z- Pinch. Not much new in it, but still worth linking:
https://newatlas.com/nuclear-fusion-bre ... nch/59257/

Re: Z-Pinch Renaissance

Posted: Fri Apr 12, 2019 2:32 am
by Ivy Matt
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.)