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Re: The Electrum Project

Original poster: Greg Leyh <lod@xxxxxxxxxxx>



Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>

Hello Greg.

> Original poster: Greg Leyh <lod@xxxxxxxxxxx>

> I looked for corona off the top corner of the secondary
> coilform while I was in the sphere and couldn't find any, visually.

was the coil`s top sealed or not when operating? what did you breath
with, if the only ozone was around it - was the weather calm or windy?


The coil manway has a hatch at the top, to keep weather out. Breathing wasn't a problem; in fact the smell of ozone was barely noticable. The sphere cleared the roof of the building, and caught more of the wind coming from Daly City. Also, the rings had the peculiar quality of squelching the noise of the arcs, so hearing protection wasn't required, like on the ground. Inside the sphere was truly the safest place to be during operation.


> Yes, 200kV/m and higher gradients are attainable, in clean, dry
> laboratory conditions.  Often times we must operate in less than
> ideal conditions however, such as these:
> http://www.lod.org/Projects/120L50K/austin01.jpg
> http://www.lod.org/Projects/120L50K/Graz40kW.jpg
> Such environments submit the coilform to high moisture content,
> smoke, particulates and atomized diesel.

i.e. you wanna have absolute warranty, that at such power level
nothing would be broken down even at the worst case, even if you would
have to make double or tripple lenght margin?


Yes.


http://www.lod.org/Projects/electrum/construction/pages/pricoil.html
"note the tuning taps at t8, t9, and t10"

and i see burned part of the pipe at t6 - what is it - first
unsuccessful attempt? %-)

That is a soldered splice joint. Unfortunately the 1" copper tubing only came in 50' coils.

http://www.lod.org/Projects/electrum/NewZealand/pages/nzmanway.html
at this photo the bus going to the final turns is inside some pipe -
what`s it - insulation from first turns?


Yes, exactly.


how did you tune your primary tank - with the help of rf generator, or
you had an opprotunity to move the tap electrode over the primary
while firing? %-)

I prefer to work strictly in the time domain when tuning coils. We fixed the rotary gap armature relative to the stators so that it would fire around 30kV, and just charged the capacitor bank with a trickle charger. The system would fire about once a second, and we tuned for maximum peak secondary current. The primary taps were for coarse tuning (ended up using T9). Fine tuning was done by adding or subtracting capacitors. The optimum tuning seemed to be at a freq just below the point that yielded maximum peak secondary current.

-GL