Search found 23 matches

by kcdodd
Mon Aug 26, 2013 8:27 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: -80kV, 40A switching power supply with resonant transformers
Replies: 6
Views: 3100

Re: -80kV, 40A switching power supply with resonant transfor

Wow, that is impressive. Is the reason for this to maintain a controlled constant voltage? As apposed to a pulsed capacitor decay? What powers this thing? (edit: found reference to a capacitor bank driving the igbt's)
by kcdodd
Sat Jun 29, 2013 10:30 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Home-made Variac
Replies: 8
Views: 3940

Re: Home-made Variac

This is a resistive ballast, and fundamentally functions differently than a transformer. It may or may not suit your needs. Consider one difference: if you power an unloaded 15kV transformer via this ballast, the output voltage will be close to 15kV throughout the entire control range, whereas if y...
by kcdodd
Sat Apr 06, 2013 2:17 am
Forum: Fusion --- Past, Present, and Future
Topic: Interesting take on using fusion to power a rocket engine
Replies: 9
Views: 5552

Re: Interesting take on using fusion to power a rocket engine

It's really putting the cart before the horse. It would be like Goddard designing a chemical rocket before steam power had been invented.
by kcdodd
Sun Mar 24, 2013 2:48 am
Forum: Images du Jour
Topic: Archived - Magnetic field + fusor grid
Replies: 3
Views: 2473

Re: Magnetic field + fusor grid

<t>Well, this is with just 2 of the 4 coils shown in the 1st picture. Each one has 100 turns. One car battery runs them in series: ~10V at ~250A, or 2.5kW. No water cooling at all. Also keep in mind that 500 gauss is only in the cusp regions. At the center where the grid is, the field goes to zero. ...
by kcdodd
Sun Mar 24, 2013 1:34 am
Forum: Images du Jour
Topic: Archived - Magnetic field + fusor grid
Replies: 3
Views: 2473

Archived - Magnetic field + fusor grid

<t>Part of a side project using fusor grids with a magnetic field. A local HS student will be expanding this with their own grids. This grid I made just to see what would happen.<br/> <br/> Picture 1: Setup<br/> <br/> Red are magnetic coils.<br/> <br/> Internal camera views are from the lower port w...
by kcdodd
Mon Feb 25, 2013 2:16 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Grid Shielding - Testing with Results
Replies: 13
Views: 7281

Re: Grid Shielding - Testing with Results

If the magnetic field is mostly trapping electrons, making a better ionizer.
by kcdodd
Tue Dec 11, 2012 12:21 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Protect your glass!
Replies: 7
Views: 2058

Re: Protect your glass!

<t>If there is lots of ionization right in the center, perhaps this could be used as a nice electron gun without a thermionic cathode? The ring shape on the open end would create beneficial focusing as electrons get pulled out. Ions get pulled back and recombine on the grid. I think you would get mo...
by kcdodd
Mon Dec 10, 2012 10:43 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Protect your glass!
Replies: 7
Views: 2058

Re: Protect your glass!

So does the Faraday probe say it's mostly positive stuff, or negative stuff?
by kcdodd
Mon Dec 10, 2012 9:03 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Protect your glass!
Replies: 7
Views: 2058

Re: Protect your glass!

<t>If you could isolate the mesh and measure any current to or from it, that tell you what's hitting it. My first guess would be electrons. Ions hitting it doesn't make sense to me, since they should not have any energy there. The less likely possibility would be neutrals from charge exchange at the...