Re: Re-entrant portion of the sphere (VDG) (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 13 Oct 2003 08:06:51 -0700
From: Daniel Reinders <danreind@xxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Re-entrant portion of the sphere (VDG) (fwd)

I found layering on a thick bead of silicone helped enormously in keeping
the corona at the column entry point down.  Looked awful though.

Dan
----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: <hvlist@xxxxxxxxxx>
Sent: Monday, October 13, 2003 5:20 AM
Subject: Re-entrant portion of the sphere (VDG) (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Mon, 13 Oct 2003 06:55:12 EDT
> From: Lyonelb@xxxxxxx
> To: hvlist@xxxxxxxxxx
> Subject: Re-entrant portion of the sphere (VDG)
>
>   A large diameter sphere with a small re-entrant radius is a must.The
point
> of column entry is the electrically weakest region on the terminal. This
can
> be offset to a considerable extent by arranging the electrode with a
> re-entrant portion into which the column fits. This results in a
diminution of the
> field intensity at this point and thus in a shielding of this electrically
weak
> region.
>   However  to make this re-entrant  portion is not easy.   Any idea ?
>
> Lyonel Baum
>
>
>