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Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Inspired by Capper's fusor, I decided to take a shot at building a "demo" model myself. I couldn't find a bell jar, so I had to use a large jar. I have some mesh and a plexy box to protect me from schrapnel should it implode.
The vacuum pump I used was old and abused, so it couldn't go as low as I'd like, but meh, it worked. After pumping the chameber down and energizing it up to some 1000V or so I was greeted by a nice ball of plasma inside the inner grid The grids were really hastly made of some thin wire, just twisted together, so I was sort of surprised it worked at all. The inner grid is just coiled up, like on capper's fusor.
Power supply was a halfwave rectified MOT and a variac to control it.
Pics
I have a guestion, though. What are those small jets of plasma coming from the inner grid called and what causes them? (you can see one in the 3rd picture)
Oh, and sorry that you can't really see the inner grid that well. That thing is hard to get good pictures of (and my camera skills suck )
Registered Member #914
Joined: Fri Jul 20 2007, 06:22PM
Location: South Bend, IN
Posts: 85
The inner plasma form is called a poissor. The jets themselves don't really have a name that I know of, but will form wherever your inner grid is asymetrical to the rest of the grid. If you get the vacuum down below 150 micron, you'll see a fine blue electron beam coming out of the middle of the poissor jet headed for the outer grid. My guess is that the electrons from the inner grid are attracted to both the inner plasma and the outer grid, and when it finds the path it wants to take, it takes some of the plasma with it, thus causing the jet. The jet of positive ions is still attracted to the negative grid, so it curves back on itself causing the horn shape. There's all sorts of information on but just like talking about Tesla coil spark shapes, some of the fusor stuff is still unknown and there are many opinions/guesses on how/why stuff happens.
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IEC device
The grids were really hastly made of some thin wire, just twisted together, so I was sort of surprised it worked at all. 
The inner grid is just coiled up, like on capper's fusor. 
)
