Search found 87 matches

by paulriley
Fri May 28, 2004 5:29 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Aluminum chambers
Replies: 4
Views: 2118

Re: Aluminum chambers

Scott,
what is your goal in using Aluminium?
do you want to experiment with D - Al interactions,
or just for fun?
Paul
by paulriley
Thu May 06, 2004 5:10 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid support insulator
Replies: 10
Views: 2667

Re: Grid support insulator

<t>Frank,<br/> Useful feedback thanks.<br/> <br/> I would think that the non-uniform E field is due to the inner grid construction. It is not spherically symmetrical. <br/> An earlier post mentioned using a geodesic structure. (i.e. spherical symmetry)<br/> Does anyone know if this improves the bugl...
by paulriley
Wed May 05, 2004 6:42 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid support insulator
Replies: 10
Views: 2667

Re: Grid support insulator

If the insulator is OK as it passes through the case, It will be OK along its length (assuming the diameters are equal).

Where else do you think E fields are non-uniform?

Paul
by paulriley
Mon May 03, 2004 5:16 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid support insulator
Replies: 10
Views: 2667

Re: Grid support insulator

The distributed resistance has to connect to wall and grid to develop a voltage along it.
Yes it will take some current, but if the R is high enough it should make little difference to power input
by paulriley
Mon May 03, 2004 11:04 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid support insulator
Replies: 10
Views: 2667

Re: Grid support insulator

Frank,
I envisage connecting one end of the (distributed) R to the case and one to the grid. The potential changes as you move along the support.

An easy way to fabricate this is to coat insulator with carbon from a sooty flame.
Paul
by paulriley
Sun May 02, 2004 7:41 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid support insulator
Replies: 10
Views: 2667

Re: Grid support insulator

<t>It depends on the voltage profile along the insulator. If it were a constant resistance per unit length, then E field will be proportional to 1/r. A profiled resistance could make it proportional to 1/r^2 the same as the E field in the rest of the sphere.<br/> (i.e. the spheres of equipotential w...
by paulriley
Sun May 02, 2004 10:03 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Ion Gun Fusor
Replies: 3
Views: 4236

Re: Ion Gun Fusor

<r>Try looking at some of the LINAC discussions:<br/> <URL url="http://www.fusor.net/board/viewtopic.php?f=15&t=6997#p48869"><LINK_TEXT text="viewtopic.php?f=15&t=6997#p48869">http://www.fusor.net/board/viewtopic.php?f=15&t=6997#p48869</LINK_TEXT></URL><br/> and <br/> <URL url="http://ww...
by paulriley
Sun May 02, 2004 9:53 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid support insulator
Replies: 10
Views: 2667

Grid support insulator

<t>If the grid insulator is a perfect insulator, the E field along the grid support insulator is different from elsewhere in the sphere. Especially where it passes throgh the case (or outer grid).<br/> <br/> Has anyone tried coating the support with a resistance (say carbon or graphite) or other met...
by paulriley
Fri Apr 30, 2004 7:03 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: some mathematical wranglings
Replies: 29
Views: 5919

Re: some mathematical wranglings

Frank,
What is the diameter of your case and grid?
Paul
by paulriley
Wed Apr 28, 2004 5:07 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: some mathematical wranglings
Replies: 29
Views: 5919

Re: some mathematical wranglings

<t>Another thought is that we could change the experiment to make the calculations easier.<br/> For example, 1D analysees are considdered accurate. If this were because the grid design was not truly spherically symetrical we could design a more even E field, do some measurements and refine until the...