7 05 2009

So this is totally unverified, but this comment from chrismb on the polywell talk forum caught my attention:

Bussard’s main claim, generating a point-cusped magnetic field and injecting electrons (thus confined) then ions confined by those electrons, expired on October 29th 2005.

All the patents since that expired one of 1985 (US4826646) are just fiddling around with details, this main core claim has long expired (showing just how long this story has been dragging on).


Grid Fab

2 05 2009

Took a stab at fabricating the grid today. We used Oxyacetylene torch to braze the welding wire together.


I managed to make the rings:rings

Tried putting it together, but I kept breaking previously brazed joints. I think I need to attach heat sinks. grid_attempt

Vacuum Chamber Update

2 05 2009

So I installed the bourdon gauge, which measures down to -100 inches of water, which equals 200 torr. The ion gauge starts at 0.05 torr, roughly 4 orders of magnitude apart.

When I fired up the pump, the bourdon gauge quickly maxed out (and spun another 1/2 revolution past that). Turning the pump off, I did not see any immediate re-pressurization.

I’m going to let it run longer today, see if we can get in range of the ion gauge.


So it’s been running for 11 hours now, and still has not made it to 5e-2 torr.

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