5FP7 project starting with the focusing coil.

[AdrianPH]

But before I go any further I could do with understanding why the line scan is double the voltages of the DC tests? Is this because of back EMF? Andy.

Here's hoping this is correct, but I would not know which inductance to use, just the scan coils or that of the transformer, or the scan coils through the transformer. I will go for the first. As I am seeing 26 Volts pk-pk across the scan coils and when measured they have an inductance of 63mH, I am pushing close to 204mA through them over 2.3 milliseconds Using L x di/dt I would only get an induced emf of 5.6 Volts so the 13.6 to 14 Volts would be closer to 19.6 Volts, so I still seem to be a bit out.

I will recheck the inductance of the coils as I have added frame coils over the top and there is also the focusing coil close by so i will check again what the inductance is in case it has increased.

Adrian