Fusor Forums

That's why I'm doing both fusor and DPF work.
No grids in DPF at all with extreme focus.
Why have I stuck with Dr Milleys approach?
Maximise neutrons and reduce grid temps
and get an average gain of power.

Larry Leins
Fusion Tech

You guys should really check out Bussard's patents on this (see thread viewtopic.php?f=14&t=6412#p43190). Basically, he came up with an extremely clever polyhedral magnetic cage which only has point cusps which quite effectively traps injected electrons. The cages are very simple to construct, and the magnetic fields required are easily obtained by ceramic grade 5 magnets (3800 gauss) for energies up to 35 KV. Using NeFeB magnets, you can trap electrons with energies up to 130 KV.

The beauty of the system is that the electrons form the virtual cathode, so there is no inner grid - it's completely transparent. No grid heating. No power loss from the grid.

The problem I've got is how to plan what I will do next.
I have to work on a year by year schedule.
It takes at least 6 months to gather , coordinate, build then the other 6 months to test.
Right now I'm in the test phase on this year's 5 projects.
I will eventually build a whole bunch of machines but it is a slow process.
I have studied Bussard's Polywell Device.
Eventually I will build one but I'm still building the infrastructure to do reliable measurements.
I am still in pursuit of the one horse fusor.
I will watch with interest what you guys do with it.

Larry Leins
Fusion Tech

Didn't mean to imply you should change strategies... The beauty of multiple researchers...

BTW, do you have a pointer to the "Dr. Milley" stuff? Just wondering, as I have no context for the title of this thread (i.e. what you're going beyond...)

Thanks

Sorry been doing this stuff so long I forgot.
https://fusor.net/old-boards/songs.com/
Look under IEC Fusor: 123 bang for the original forum discusion on this stuff.
Dr Milley acheived 100 1 millisecond bursts 200,000 n/burst using modest equipment at the U of Ill in the 100 j range (where I started) . I now have achieved a 50 GW burst out of my cap system. Milley created 200 ma pulses at 10 and 15 kv using a thyratron. I'm using a spark gap for higher energy pulses. The next move is to build a rotary spark gap that will create a 10kv pulse
that is 2 microseconds wide at sixty times a second.
I'm now past internal arc and have establed an operating regime in the 3 to 1 torr range.
I am shooting for 10^13 n/pulse ....my little setup now delivers 10kv at 10 ka for 2 microseconds.... close very close. The X-rays are murderous even at this one pulse level 5 rhoetens an 10 rhoetens per pop....Yikes.

Larry Leins
Fusion Tech

Ye gods. That's impressive. Incredibly impressive. Now I understand why you are operating this under a faraday cage. You'd likely take out all the surrounding houses' electronics with that kind of pulse output.

This stuff is cool.

You've probably already seen this, but the Northstar Research pulsed power formulary would probably be handy (http://www.northstar-research.com/PDF/Formweb1.pdf) Should probably post the link in case anyone hasn't seen this yet.

Thanks for the link.

The best part it was fairly easy to do but you have to use fast response capacitors in the 12nH range for it to work. I had to use copper water pipe to prevent
resistive heating due to high currents. Currently I'm using 1/2" copper tubing as my disharge lead.
Even a small capacitor such as the 2uf I used at first can be coaxed into high current by reducing the lead length hence resistance. At 2uF and a lead resistance of 1 ohm the time is 2 x 10^-6 seconds. But only if the inductance of the capacitor is very low.
The power then works out to 100j/2 x10^-6 sec.
100 Mw!... Pop Bang Tinkle.
I have moved up to a 33uf low inductance capacitor for roughly 1650 j or 1650j/2 x 10^-6 = 825 x 10 ^6 or 82 GW.
Heavy duty power No?

You can be King Kong for a total of 2 microseconds...
the best part I use a wimpy little ps of 10kv @ 5 ma
for charging the capzilla sized unit charges up in less
than 15 seconds. The noise when the spark gap fires is indescibable outside of military ordinance. Sounds like a 105 howitzer when it fires.

Fusion is fun!
Larry Leins

Well guys the gods of ebay have smiled again.
A new cap enters my stable.
It is a 2uf @ 50 kv capacitor laser cap.
Fully charged it should carry 2500 j when charged to capacity.
If I can get it to roll at 2 microseconds then the watts will be in the neighborhood of 1.75 x 10 ^9 watts of 1.75 GW. At this higher voltage the crossection should be better ...a define backyard baby.

Larry Leins
Fusion Tech

1.21 gigawatts!!!

definitely amazing! I don't know if you'll be able to get anywhere close to 10^13 neuts though, by that point your\\'re starting to push the limits on exhausting the fuel in the chamber at one point in time. Still, thats one buttload, good luck to you!

Got the power plug to the machine......see it I can make it dance.