Re: Can this be done?

On Fri, 01 Apr 2005 19:36:47 -0500, Phil Hobbs
<pcdhSpamMeSenseless@xxxxxxxxxx> wrote:

>Dear All:
>
>I have a possibly very interesting instrument application that requires the
>application of a very large ac voltage, about 3 kV p-p anywhere between 20
>and 50 GHz--it doesn't much matter where.
>
>The actual power dissipated in the instrument is quite small, so I don't want
>to use a radar transmitter to drive it. Pulsed operation is fine--duty
>cycles of at least 1% are needed, though.
>
>Waveguides and striplines for these frequencies are quite small, which leads
>me to worry about corona, rf arcs, and so on.
>
>I don't mind using vacuum if necessary.
>
>Any ideas for less than about $20k in parts?
>
>Thanks,
>
>Phil Hobbs


This would have to be inside a cavity or a waveguide; if a signal like
this existed in free space, it would radiate kilowatts. And if it was
a microstrip or stripline, it would probably fry any reasonable
substrate.

The Cebaf (now Jefferson Labs) electron accelerator used
superconductive niobium cavities, each pumped by a fairly small
klystron, to get megavolts/meter fields at something like 3 GHz.

Sounds like magnetron territory to me, not difficult at 1% duty cycle
if you can use a field inside a cavity or waveguide. Who is that
company that has scads of old radar gear and antennas and stuff? Radio
Research or something.

John



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