5FP7 project starting with the focusing coil.

[ppppenguin]

Anyway what I was thinking is that I have a 220 V primary transformer with two 24 Volt secondary windings, so I can wire them up to give 48 Volt output in normal rms values it is normal 40VA transformer.

The core will saturate badly at 12.5Hz. As I've said before, to get 50Vp-p (approx 18V RMS) at 12.5Hz you need a nominal secondary voltage of at least 72V on a nominal 50Hz tansformer. That's before even thinking about the DC.

Going for a higher VA rating doesn't help.