Re: Van de Graaff generator safety question (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 4 Jan 2004 22:23:32 -0600
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Van de Graaff generator safety question (fwd)


The brush (wire screen) pickup has to be inside the terminal or else any
sharp edges will leak the charge off.  There is one exception --- a very
large toroid under the sphere which is only 1/2 inch off the pickup.  This
works as the toroid provides shielding.  We have made some this way and they
work up to around 300 kV but not above.  We ran a 20 inch wide belt at 2,200
RPM.  Toroid was 34 x 8.5 inches.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: <hvlist@xxxxxxxxxx>
Sent: Sunday, January 04, 2004 8:12 PM
Subject: RE: Van de Graaff generator safety question (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sat, 03 Jan 2004 17:38:13 -0700
> From: Erik Von Halle <erikvonhalle@xxxxxxxxxxx>
> Reply-To: Erik_Von_Halle@xxxxxxxxxxxxxx
> To: hvlist@xxxxxxxxxx
> Subject: RE: Van de Graaff generator safety question (fwd)
>
>
>
> Why cut the hole at all?
>
>
>
> The purpose of the hole is to have a way for the belts and brushes to get
to the INSIDE of the sphere. This is the
> TRADITIONAL design. The static charge migrates to the outside of the
sphere. Charge is very much a surface effect.
> The current in electric lines goes down the outside of the wires. Not
really on the inside. This is just because
> the electrons repel each other.
>
> A DIFFERENT DESIGN.
>
> The electric charge can just as easily be transferend to the sphere from
the outside. This then introduces a
> different problem. How to hold the sphere in place next to the brushes and
charge it up?
>
> Erik
>
>
>
>
>
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