Re: Van de Graaff generator safety question (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 7 Jan 2004 11:49:27 -0500
From: Ralph Zekelman <hyperion@xxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Van de Graaff generator safety question (fwd)

Dr. R,

I see references made to the wire brush and the serrated or sawtooth
comb. The wire brush is in contact with the belt and must charge by
conduction. The comb with its pointed sawtooth is placed near the belt
but not in contact. It therefore charges by induction to produce an
opposite charge on the sphere. Is there a preference?

Has anything ever developed re the 12 / 120 nst order?

Thanks.
Ralph Zekelman




> ---------- 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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