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corona (fwd)
---------- Forwarded message ----------
Date: Mon, 03 Mar 1997 15:01:47 -0700
From: Dave Burman <dburman-at-ix-dot-netcom-dot-com>
To: Tesla List <tesla-at-poodle.pupman-dot-com>
Subject: corona
I recently took some photos of my coil in operation. When I got the
photos back I noticed that all the pictures show a blue ring of corona
on the ground ring around the primary and comming down from the top of
the secondary. I have not noticed this while running the coil but it
shows up on all of my photos.
I understand that the corona from the top may be from having the
torroid too high. Does any one have any ideas what may cause the corona
on the ground ring? (It looks cool in the pictures but I doubt if it's a
good thing)
My coil configuration is as follows:
2 15kva neons
2 air wound and 2 ferrite core chokes
copper tube vacuum quenched spark gap (8 tubes, .030 spacing)
Primary -1/4" copper pipe with 3/8" spacing 12 turns
Secondary - 6" acrylic wound with 22" of 24ga magnet wire
Torroid - 4" dryer duct around a 24" pizza pan
ground - very heavy welding cable (1/2" dia) connected to 1 8' copper
plated ground rod