Jones Beene wrote:
> >
> > Frederick,
> >
> > Although the JNL specs show otherwise, would you guess that his
> > cathode is thoriated ? Even if it was, it would not have shown up
> > in the radiation tests, most likely.
> >
How much Helium (from alpha emission) would the thorium add, Jones?
>
> If he didn't modify the tube much the filament could be thoriated.
>
> BTW:
> The thoriated filament emits about 1.0E5 times as much as a pure W
> filament at any given temperature and at 2000 K -1324 watts could be
> emitting
> way over 8 amperes of electrons, even though the power is greater than the
> 750 watt
> vacuum rating of the tube. (the hydrogen cooling and electron emission is
> holding the filament at the lower temperature).
> The "missing" ~ 24% power could be because the electrons are getting to
> ground though the tube wall, thus it's also acting as a thermionic
> converter. ?
>
> This would make the filament resistance ~ 0.075 ohms at 2700 K and 0.008
> ohms
> at 300 K. At 1700 K ~ 0.043 ohms, at 2000 K ~ 0.052 ohms and ~ 0.058 ohms
> at 2200 K.
>
> For 1324 watts at 2000 K, I = ~160 amps V = ~ 8.33 volts etc (the battery
> can handle this).
>
> Frederick.
> >
> > Jones
>
>
