They typically use modern tetrodes such as the 4CM2500KG/X2274
(CPI/Eimac) or TH526 (Thales) to make this power. They are in large
coaxial circuits, the two I have seen are bigger than a small room.
Either individual amplifers feed each antenna or they use power
splitters and feed from a common PA.
Its 'conventional' tube technology, scaled up in size and power..
73
John
K5PRO
>Message: 7
>Date: Fri, 21 Oct 2005 16:45:38 -0500
>From: "Keith Dutson" <kdutson@sbcglobal.net>
>Subject: [Amps] Really BIG Amps
>My education in physics has led me to keep track of developments in D-T
>fusion over the years. One recent paper described the use of an amp to
>impart 40 megawatts of RF energy in the range of 25-45 MHz to the plasma in
>a Tokamak reactor. This is one method used to heat the plasma.
>
>Any idea what kind of circuit would be used for an amp like this? The
>article mentioned that an array of 10 antennas was used to inject the RF
>directly into the plasma.
>
>73, Keith NM5G
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