Do you think this is a yoke?!Hi all! Once again I'm trying to get some progress on my home built tabletop NMR spectrometer, and I figured the magnet's a good place to start, since everything else is kindof dimensioned after magnet strength.
I've settled on getting two puck shaped neodymium magnets, around 15 mm height 30 mm dia., and and mounting them in a U shaped yoke with a 10mm gap for the probe.
This will give me 0.85 T in the gap, which would have 13C resonate around 9.1 MHz, that's all good.
But how should the yoke be made? Soft iron, of course, but in practice;
- how should it be sized?
- can the magnet diameter be larger than the width?
- get some flatbar and bend it to a U or weld 3 pieces in a square-ish U?
- how could the magnets be attached to the U? epoxy maybe? They'll be pulling away from the yoke, towards each other with some significant force..
- Where do you even GET soft iron?
--OR would the easiest be to cut out a chunk of a stripped toroidal transformer's core to make a rounded U?
thanks in advance! I really want to get this right, because a good, homogenous magnet would be a good basis for a lot of development and experimentation on the 'tronix side.
I found a pretty nice gap field strength calculator:
https://www.kjmagnetics.com/gap.calculator.asp, might be useful for some
Thanks for the attention!