Periodic permanent magnet focused klystron

A periodic permanent magnet (PPM) klystron with a central axis and having:

• a plurality of beam transport structures, each said beam transport structure comprising:
• a ferrous pole piece;
• a plurality of magnetic field generators positioned beyond a first radius from said central axis;
• a beam transport section formed by the inner diameter of a cooling chamber which surrounds said beam tunnel, the cooling chamber outer diameter extending to within said first radius;
• a plurality of RF cavity structures, each said RF cavity structure comprising:
• a ferrous pole piece;
• a plurality of magnetic field generators positioned a second radius from said central axis and adjacent to said ferrous pole piece;
• a beam tunnel aperture formed by the inner diameter of an RF cavity, the beam tunnel aperture coupled to the RF cavity, the RF cavity extending to a third radius from said central axis;
• a coolant chamber formed in the extent between said RF cavity and said magnetic field generators;
• where the magnetic field generators of said beam transport structures and said RF cavity structures are placed in alternating magnetic field polarity;
• an output RF cavity structure comprising:
• a magnetic field generator spanning said output RF cavity structure;
• a plurality of final beam transport structures and final RF cavity structures, each said final beam transport structure having a beam tunnel aperture formed by a coolant chamber circulating a coolant, each said final RF cavity structure having a beam tunnel aperture coupled to an RF cavity;
• said output RF cavity structure having a final RF cavity coupled to an RF output port, said plurality of RF cavity structures having a first RF cavity coupled to an RF input port.

A multi-beam periodic permanent magnet (PPM) klystron having a central axis surrounded by a plurality of parallel beam tunnels, the multi-beam PPM klystron having:

• a plurality of beam transport structures, each said beam transport structure comprising:
• a ferrous pole piece;
• a plurality of magnetic field generators positioned beyond a first radius from said central axis;
• a beam transport section formed by a cooling chamber which surrounds said central axis and includes a passageway for each said beam tunnel, the cooling chamber outer diameter extending to within said first radius;
• a plurality of RF cavity structures, each said RF cavity structure comprising:
• a ferrous pole piece;
• a plurality of magnetic field generators positioned a second radius from said central axis and adjacent to said ferrous pole piece;
• An RF cavity having a plurality of apertures, one said aperture for each said beam tunnel, each beam tunnel thereby coupled to the RF cavity, the RF cavity extending to a third radius from said central axis;
• a coolant chamber formed in the extent between said RF cavity and said magnetic field generators;
• where the magnetic field generators of said beam transport structures and said RF cavity structures are placed in alternating magnetic field polarity, and said first said RF cavity coupled to an input source and a last said RF cavity structure coupled to an RF output.

A multi-beam periodic permanent magnet (PPM) klystron having a central axis surrounded by a plurality of parallel beam tunnels, the multi-beam PPM klystron having:

• a plurality of beam transport structures, each said beam transport structure comprising:
• a ferrous pole piece;
• a plurality of magnetic field generators positioned beyond a first radius from said central axis;
• a beam transport section formed by a cooling chamber which surrounds said central axis and includes a passageway for each said beam tunnel, the cooling chamber outer diameter extending to within said first radius;
• a plurality of RF cavity structures, each said RF cavity structure comprising:
• a ferrous pole piece;
• a plurality of magnetic field generators positioned a second radius from said central axis and adjacent to said ferrous pole piece;
• an RF cavity having a plurality of apertures, one said aperture for each said beam tunnel, each beam tunnel thereby coupled to the RF cavity, the RF cavity extending to a third radius from said central axis;
• a coolant chamber formed in the extent between said RF cavity and said magnetic field generators;
• a final output structure;
• where the magnetic field generators of said beam transport structures and said RF cavity structures are placed in alternating magnetic field polarity, and said first said RF cavity coupled to an input source and a last said RF cavity structure coupled to an RF output
• and where said final output structure comprises:
• a magnetic field generator spanning said final output structure;
• a plurality of final beam transport structures and final RF cavity structures, each said final beam transport structure having a passageway for each said beam tunnel, each said final beam transport structure forming a a closed coolant chamber for circulating a coolant, each said final RF cavity structure having a plurality of beam tunnel apertures coupled to an RF cavity, each said beam tunnel aperture corresponding to a particular beam tunnel;
• said final output structure having a final RF cavity coupled to an RF output port;
• said plurality of RF cavity structures also having a first RF cavity coupled to an RF input port.