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Re: Pseudo Toroid Design




From:	BertPool [SMTP:Bert.Pool-at-flash-dot-net]
Sent:	Monday, November 10, 1997 11:52 PM
To:	Tesla List
Subject:	Re: Pseudo Toroid Design


> 
> From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> Sent: 	Monday, November 10, 1997 2:22 PM
> To: 	Tesla List
> Subject: 	Re: Pseudo Toroid Design
> 
> Hi Bert, all,
> 
> > From:   BertPool[SMTP:Bert.Pool-at-flash-dot-net]
> > Reply To:   bertpool-at-flash-dot-net
> > Sent:   Sunday, November 09, 1997 4:04 PM
> > To:     Tesla List
> > Subject:    Re: Pseudo Toroid Design
> > 
> > [additional large snip]
> > 
> > I have to take issue with the good Friar's comment that the inner 
> > part of the top load not being important or "useful".  Without an 
> > inner disk, the toroid forms a perfect single turn short, which can 
> > absorb a huge amount of your coil's energy.  The disk "shorts" out 
> > this single turn and prevents the toroid from acting as a short as 
> > seen by the coil. We found this out on the extra coil on our large 
> > magnifier. The resonator coil was driven with a transmission line, so 
> > we didn't think a solid metal disk was important.  We were wrong.  
> > The toroid at the bottom of the coil (for field shaping) got so hot 
> > it melted hot glue!  Richard Hull had about the same thing happen 
> > (Richard, correct me if my memory is wrong on this.)  I always make 
> > sure that I have a solid metal disk in the center of all toroids now, 
> > regardless of size.  Especially on magnifiers.  The disk contributes 
> > little or nothing to field shaping, but it *does* play an important 
> > part of the toroid assembly.
> > 
> > Smokin' them toroids in Ft. Worth,
> > 
> > Bert Pool
> > TCBFW
> > bertpool-at-flash-dot-net
> 
> I think it makes a difference where it is located on the coil. I've 
> seen no difference between centre disk or no if the toroid is the 
> last one in the chain (top of the resonator). I would imagine that 
> anything approaching a short circuit would have a most detrimental 
> effect if positioned at the base because that is where the current 
> peaks.
>      What are your observations regarding the two types when 
> positioned at the business end of the resonator?
> 
> Regards,
> Malcolm
> 

Hello Malcom!

My top toroids have always had a shorting disk in the center.  The 
only time I attempted to use a toroid without a disk was at the 
bottom of the resonator.  The bottom toroid only had a cross section 
of 3 inches and had an inside diameter of 8 inches - rather small.  
My top toroids are 36 inches across with an 8 inch cross section, so 
even if that one didn't have a shorting disk, the difference in mass 
alone could mask any heating effects.  More careful work needs to be 
done in this area.

Bert Pool
TCBFW
bertpool-at-flash-dot-net