Re: Van de Graaff /Pelletron (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 20 Jan 2004 23:02:04 -0600
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Van de Graaff /Pelletron (fwd)


One also has to remember the Pelletron chain is operated in  several atm of
SF6 gas.  Operation in open air is very poor for height to spark output
considerations.

I know of an air-insulated machine at Univ. of Wis. that is used for physics
demonstrations.  Since it is an air insulated machine it stands over 6 feet
tall and only puts out an anemic 10 inch spark at approx 200 kV.  Not
exactly what you want to see if your interest is in big sparks.  My belt
driven machines put out 3 times that spark length in air.

The conductive nature of the Pelletron chain usually restricts them to
insulated tank operation.  Operating a long belt with conductive links in
air works but produces very poor sparks.

Of course, sparks are detrimental to VDGRF's in insulated tanks.  Corona
losses and sparks produce very poor voltage regulation for high energy
physics experiments.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: <hvlist@xxxxxxxxxx>
Sent: Tuesday, January 20, 2004 9:37 PM
Subject: Re: Van de Graaff /Pelletron (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Tue, 20 Jan 2004 19:55:36 -0500
> From: David Sharpe <sccr4us@xxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Van de Graaff /Pelletron (fwd)
>
> HV List
>
> Michaels, Ben Franklin,(etc.) also have styrofoam balls
> that might also work as charge transfer media.
>
> Regards
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA. USA
>
> High Voltage list wrote:
>
> > Original poster: Steven Roys <sroys@xxxxxxxx>
> >
> > ---------- Forwarded message ----------
> > Date: Mon, 19 Jan 2004 11:08:38 -0800
> > From: Jim Lux <jimlux@xxxxxxxxxxxxx>
> > To: High Voltage list <hvlist@xxxxxxxxxx>
> > Subject: Re: Van de Graaff /Pelletron (fwd)
> >
> > > Charles Brush"
> > >
> > > The thought of making hundreds of beads sort of discourages me.  I
have
> > > been wondering if a jewelry or art supply store might have metallic
> > > beads with holes for stringing already there.  Might not be too much
> > > work to make up a "necklace" and give it a try.
> >
> > Hie thee to Michaels or equivalent (a large store catering to the craft
> > market) and spend some time browsing.  There's all manner of balls,
rods,
> > etc, made of all manner of materials. Conductive paint might be nice to
add
> > to some.
> >
> > Pingpong balls might work nicely, and a hot needle can quickly make very
> > nice holes.  They're moderately expensive though.
>
>
>