Towards Realizing the TPU

[poynt99]

From:
http://www.crl.nitech.ac.jp/comp/papers/stephacova.pdf

1. Introduction Nuclear magnetic resonance (NMR) is a method sensitive to the local properties of
magnetic materials. It has been applied to YIG containing various substituents or intrinsic substituting
defects on iron and yttrium cation sites [1â€"6]. NMR spectrum of 57Fe nuclei for an ideal YIG structure
contains a single d-line assigned to iron ions in tetrahedral crystallographic sites and two lines a1 and a2
having integral intensity ratio 1 : 3 which correspond to octahedral sites. Spectrum of a-sites splits into
two lines because of the magnetic nonequivalency of a-sites with respect to the [111] direction of magnetization.
Resonant frequencies are proportional to the local magnetic field at iron nuclei by gyromagnetic
ratio 1.377 MHz/T.

??

.99

[poynt99]

From Becker:

http://books.google.com/books?id=lV387lG0u_kC&pg=PA29&lpg=PA29&dq=Larmor+frequencies+becker&source=web&ots=d6cEdzKWKu&sig=uc9vrLqKIHvROccPr-MG-5Jn3F8&hl=en&sa=X&oi=book_result&resnum=2&ct=result#PPA382,M1

NMRF of Fe: 3.2378 MHz @ 2.35 T

Which works out exactly to the above 1.377MHz/T.

10k G = 1T
Earth's magnetic field varies between 0.3G to 0.6G; Ave = 0.45G

0.45 G = 45uT

The NMRF of Fe in earth's field ~ 62 Hz ?

.99

[poynt99]

The question in my mind regarding iron's NMRF and the mention of it in the spherics posts has always been:

What does the NMR frequency of iron have to do with the pulsing frequency in spherics' design when he vehemently avoids the use of Fe, including the use of the iron delay coil?

.99

[Grumpy]

The question in my mind regarding iron's NMRF and the mention of it in the spherics posts has always been:

What does the NMR frequency of iron have to do with the pulsing frequency in spherics' design when he vehemently avoids the use of Fe, including the use of the iron delay coil?

.99

(The iron delay was for a different design using different parameters.)

Maybe with this geometrical arrangement, NMR of iron works.

[poynt99]

The delay coil's purpose was just to introduce a delay on the cheap. Any "slow" conductor should do the job.

Spherics spoke little of iron's effects and purpose (aside from providing a delay) in the device and I am not convinced that using its NMRF is integral to achieving a successful design, (geometric or otherwise) esp. since his tetrahedral device contains no iron. Fortunately, we have function generators/oscillators etc.

Spherics left us with some good material, but like all others, there are inconsistencies and gaps, unfortunately. I am not complaining though

.99

btw, I suspect Steven "liked" 35.705 kHz for his 15" TPU, because using 35.7806 kHz is the exact frequency that would cause runaway.