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Fwd: Primary and copper (fwd)

If your going to use liquid nitrogen to cool the secondary or the primary, you
might as well replace the copper wire with super conducting wire. :)

Erik Schulz
ESchulz531-at-aol-dot-com

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---------- Forwarded message ----------
Date: Sat, 28 Mar 1998 09:10:21 -0800
From: Jim Lux <jimlux-at-earthlink-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Primary and copper


> From:  ESchulz531 [SMTP:ESchulz531-at-aol-dot-com]
> Sent:  Thursday, March 26, 1998 4:30 PM
> To:  tesla-at-pupman-dot-com; tesla-2-at-emachine-dot-com
> Subject:  Primary and copper
> 
> Too all,
> 
>      The following is a list of the 75% current depth in copper at
different
> frequency.  
> 
> kHz, mils         mil is 0.001 inches
> 1000, 2.6
> 900, 2.7
> 800, 2.9
> 700, 3.1
> 600, 3.4
> 500, 3.7
> 400, 4.1
> 300, 4.7
> 200, 5.8
> 150, 6.7
> 100, 8.2
> 75,  9.5
> 50,  11.6
> 25,  16.4
> 
> "Share what you know, otherwise you wouldn't know it."
> 
> Erik Schulz
> ESchulz531-at-aol-dot-com
> 
Interesting.. For a TC running at 100 kHz with a primary wound of copper
tubing, you would only need a wall thickness of 25 or so mils (3 times the
75% thickness). What is the wall thickness on soft tubing?

As an off the wall aside, if you were to cool the tubing with dry ice or
liquid nitrogen, the conductivity increases by a substantial amount (3
times for LN2?), which would greatly reduce resistive losses in the
primary, increasing the output of the coil (for a given input power). You
could also cool the secondary, as well. Now wouldn't that look interesting,
the fog from the LN2 boiloff combined with the sparks from the top?

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