Fusor Forums

Come on guys, give me more credit than that! This was just a vacuum test. I have plenty of experience with voltages to 40 kV. The fittings you see in the photo are for a seal only. When I apply voltage, i will add features to prevent corona. Regarding the length, as I said, my tube fitting has a sto...

I am adding a Liam David style feed through to allow boosting my voltage. My vacuum test is okay, but I holding off on properly sealing the feedthrough end until I get a grid installed that I'm happy with. The big disappointment is my tube fitting has a stop in it and is therefore inadequate. I don'...

I tried my hand at making my own feedthrough from a big standoff. I brazed its skirt to a CF flange. I can easily get it in the 10‐⁵ range but it leaks easy too much for my taste. I'm not sure where it's leaking. I baked it the oven for a couple hours but that didn't help. I am looking at making a L...

I wonder if hitting those kind of neutron numbers emitted from a small chamber like that would allow low resolution neutron radiography. I think high res requires 10⁹ n/cm²-sec, but maybe an accumulated exposure could be done on a gadox screen and a properly shielded camera with the numbers you are ...

Joe,
Thanks for sharing. Yours is certainly a premium, benchmarkable setup. Do you use any shielding?

Jim K

Update:
This evening's run: -38 kV 6.8 mA. A count rate of 5700 cpm was observed for the first 5 minutes after which the count rate steadily dropped to below 4000 cpm when I shut it down.

First real fusion run on this fusor iteration today. Before I could get to fusion relevant voltage I had to remove the alumina from the stem. I'm not sure why I bother putting it on in the first place because I don't have the best of luck with it. The alumina tubes seem to cause a lot of sparks. My ...

The tungsten carbide ring is too small and caused control problems. I may buy a larger one, but in the mean time I substituted a singled braided tungsten wire ring. The larger diameter improved my ability to control at lower currents that make conditioning easier. Symmetry is a little better this ti...

Mark,
I had previously tried Ti plates at the beam ends. It outgassed terribly.

My small fusor was arc limited at 38 kV. The arcs were ferocious and destroyed instruments. . The tungsten carbide ring is a wedding band. They cost about 11 dollars on ebay. I will probably go with a larger size than the one in the picture because the control characteristics are rough. It's too har...