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Old 27th Oct 2021, 8:47 pm   #30
AdrianH's Avatar
Join Date: Mar 2020
Location: Blackburn with Darwen, Lancashire, UK.
Posts: 1,063
Default Re: 5FP7 project starting with the focusing coil.

I wound the Iron wire around the focus coil just to see if it improved things, the result is, basically not a lot.

Previously with a EHT of 3K5 Volts, it took 82 mA to focus the beam now at 3K6 volts EHT it is now taking 81 mA to do the same. So I guess that there has been little to no improvement down the axis of the coil, perhaps I have stopped some tray field but nothing to really have much of a gain.

I used 1.6mm iron wire which was probably to thick, it was certainly a pain to wrap the coil with and I have done two layers. Oh well.

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