Re: [TCML] New Torroid

[Sfxneon@xxxxxxx]

Hey Bert,

Thanks for the nice comments and suggestions. This is the  right time for 
making the final changes to the coil before I commit to a final  design. I'm just 
ironing out all the bugs and trying to build a reliable, safe  and portable 
system that can be moved around easily. 
 
I'll probably lower the coil to the ground by eliminating the round table,  
except for when I want it to strike the steel roof trusses. There's nothing in  
that building to burn or be bothered by HV strikes, and those connecting  
streamers to the arched steel trusses look really cool! This place was an iron  
works since 1946, and has high vaulted ceilings in the big room, which is over  
5000 square feet. 
 
I've been trying different heights with the torroid, and seeing firsthand  
the tradeoff between shielding the top turns by lowering, and raising to prevent 
 primary strikes. There is no really good setting, so I'm going to try a 
smaller  torroid right above the last turn so that the big torroid can be elevated 
away  from the primary.
 
The battery clip on the primary is only for the initial testing and will be  
replaced by something below the coil as you suggest. That's something I'm 
still  working on in my head, how to make a slider mounted on the primary base 
that  allows easy tapping from underneath.
 
Thanks,
 
Tony Greer
*************

In a message dated 9/8/2008 10:21:40 A.M. Central  Daylight Time, 
bert.hickman@xxxxxxxxxx writes:
Hi Tony,

That's a nice,  clean looking coil... and its throwing some very mean 
looking  sparks!

Some potential suggestions:

Reduce the overall height of  the system by reducing the length of the 
bottom legs. This will give you  more top clearance to reduce strikes to 
the ceiling, conduit, plumbing, or  (heaven forbid) fire, burglar alarm, 
or loose CAT5 wiring.

If the  toroid is too high (versus the secondary), you may develop a 
conical region  of "Christmas tree" corona between the top of the 
secondary winding and the  primary that can stimulate secondary:primary 
strikes or racing sparks along  the secondary. Try reducing the height of 
the main toroid, increasing its  diameter, or add a smaller (15 - 20" 
diameter) field grading toroid between  the secondary and existing 
toroid. These measures will reduce the E-field  gradient seen by the top 
of the secondary, increase effective shielding, and  help throw streamers 
outward, and away, from the primary.

In one  picture it looks like you may be using a large alligator clip as 
a primary  tap on the top side of the primary. This can be a tempting 
target for  streamers or even strikes from the upper portion of the 
secondary winding.  Try tapping from below if you have sufficient space. 
In any event, minimize  projecting height of the tap above of the primary 
winding so that you  maintain a smooth E-field at the primary's top 
surface.

Good luck and  best wishes,

Bert
 



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