Re: just wondering

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq-at-uol-dot-com.br> 

Tesla list wrote:

 > Original poster: "john cooper" <tesla-at-tesla-coil-dot-com>
 >
 > In a magnifier, you want the tightest coupling possible, i.e., a solenoidal
 > primary.  That doesn't mean that other primary configurations won't work
 > but the magnifier's main reason for being is its power processing 
capability.

Not necessarily the "tightest possible", but any reasonable design ends
with a quite high coupling.
See: http://www.coe.ufrj.br/~acmq/tesla/magnifier.html

Just to verify, I can use the Inca program to calculate the coupling
coefficient between a flat primary coil and a flat secondary coil that
continues it, forming a disk. Let's suppose a primary with 10 turns
with maximum radius of 50 cm and minimum radius of 25 cm, with a
secondary coil with 1000 turns with the shape of a disk inside it,
with a radius of 24 cm. Wires with 2 mm and 0.2 mm.
Inductances: 0.l mH and 167 mH
Coupling coefficient: 0.294
Not very tight, but enough for a magnifier operating close to mode
4:5:6.

Antonio Carlos M. de Queiroz