Re: Superconducting magnifier

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Superconducting magnifier
From: Tesla List <tesla-at-stic-dot-net>
Date: Sun, 9 Nov 1997 15:19:36 -0600
Approved: tesla-at-stic-dot-net

From: 	Steve Rodway[SMTP:Legion-at-bigfoot-dot-com]
Sent: 	Sunday, November 09, 1997 1:26 PM
To: 	Tesla List
Subject: 	Re: Superconducting magnifier

Tesla List wrote:
> 
> From:   Ted[SMTP:tedric-at-generation-dot-net]
> Sent:   Sunday, November 09, 1997 2:28 AM
> To:     Tesla List
> Subject:        Re: Superconducting magnifier
> 
> >From:  Steve Rodway[SMTP:Legion-at-bigfoot-dot-com]
> >Sent:  Thursday, November 06, 1997 7:51 AM
> >To:    Tesla List
> >Subject:       Re: Superconducting magnifier
> >
> >Tesla List wrote:
> >>
> >> From:   Jim Lux[SMTP:jimlux-at-earthlink-dot-net]
> >> Sent:   Tuesday, November 04, 1997 10:13 AM
> >> To:     Tesla List
> >> Subject:        Re: Superconducting magnifier
> >>
> >> > As I understand it the superconducting effect is destroyed by intense
> >> > magnetic fields because they destroy the electron coupling. Since
> >> > powerfull feilds are the aim in Tesla coils, I don't think that any sort
> >> > of superconducting system could work, sorry to dash your hopes, but
> >> > that's physics for you.
> >>
> >> I don't think the magnetic field in a tesla coil would be high enough to
> >> quench the superconductor.
> >
> >Are you sure about that? The fields as the spark gap fires should be
> >very intense around the primary
> 
> Steve,
> 
> First of all, thanks for the physics. But haven't I already mentioned
> critical magnetic field in my post? I guess you were just trying to remind me.
> 
> Although I am no expert in this field, I believe you are not too, since you
> used the qualitative term "intense". May I ask you how much is intense, half
> a Tesla? a Tesla or 10 Tesla? You are simply not talking science.
> 
	OK, the field strenght produced in a coil is given by h=NI/l, given a
typical primary might have 15 turns, be 20cm high, and have a peak
current of 1000A, this gives a peak value for the field strength to be
75,000A/m. Looking a several reference texts in library, I find a
typical value for the critical field to be around 5,000A/m, so the
critical field is easily exceeded.

--
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