I'm trying to build a C or H-frame electromagnet that produces a flux of 1.4T in the gap between its two poles. (See: http://cyclotron.lbl.gov/images/Cyclotron%20yoke.JPG [Broken]) But I can't find any references on building C/H-frame electromagnets. I calculated with permittivity of free space 4piE-7, gap 5.08E-2 in metres that I'd need either 3000 turns with 21.5A, or 2000 turns with 32.2A. Now, the problem is, I have absolutely no idea of how the yoke works. I only know that I need a C/H-frame. Correct me if I am wrong, do I simply wrap 1500 turns (running 21.5A)/1000 turns ( running 32.2A) on each cylindrical section nearest to the gap (refer to picture)? (1) Secondly, I'd think it is extremely difficult to shape a block of iron like that, so I'm planning to build a laminated core. In which case, what exactly do I use to hold the iron sheets and insulator sheets of the laminated core together? (2) I'm thinking that an adhesive would not hold them together because of the overheating, but a mechanical joint is not feasible either as the core will go out of shape. Which brings me to, what type of material would you use for the insulator sheets anyway? (3) Lastly, I'm not adverse to reading up and figuring these out myself; so I'd be extremely appreciative if someone could just point out any references. (4) Thanks in advance!