Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!uc!noc.MR.NET!ns!logajan
From: logajan@ns.network.com (John Logajan)
Newsgroups: sci.electronics
Subject: Re: Need Al hemispheres (approx 16-20" dia)
Message-ID: <1990Sep17.042146.6699@ns.network.com>
Date: 17 Sep 90 04:21:46 GMT
References: <1931@oucsace.cs.OHIOU.EDU>
Organization: Network Systems Corporation
Lines: 17

bwhite@oucsace.cs.ohiou.edu (Bill White ) writes:
>a very large van de graaff generator (about 4' high, fed with a 10kV
>charge screen, hoping for up to 1MV if I'm lucky and running in SF6).
>Anyhow, I need the top sphere, which should be in the range of 16 to 20
>inches diameter

Ever consider an aluminum foil covered styrofoam ball.  Or perhaps spray
paint the ball with a conductive paint.  Seems like it would be a fairly
simple task to build a sphere lathe (maybe a hotwire template that you
rotate the ball through.)

Then you could build an optimum shaped anode, which is more mushroom
shaped than purely spherical.

-- 
- John Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428
- logajan@ns.network.com, 612-424-4888, Fax 612-424-2853