公开(公告)号：CA1152587A

公开(公告)日：1983-08-23

申请号：CA365865

申请日：1980-12-01

Applicant: VARIAN ASSOCIATES

Inventor： SHIVELY JAMES F ,  EVANS STEVEN J ,  JORY HOWARD R ,  MIZUHARA YOSUKE M

IPC: H01P1/08 ,  H01P1/30

Abstract: Circular Electric ~tode Microwave Window For conducting very high microwave power at very high frequencies, circular waveguide transmitting a-circular-electric-field mode is used. The vacuumtight window of an electron tube is often the element with lowest power-handling capability. The inventive window has two dielectric plates with a space between them. There is a gap in the waveguide inner wall through which a dielectric fluid is circulated between the plates to cool them. The gap leads to a region containing wave-absorbing material such as water to absorb modes other than the circular-electric-field mode.

公开(公告)号：DE69204509T2

公开(公告)日：1996-02-29

申请号：DE69204509

申请日：1992-03-09

Applicant: VARIAN ASSOCIATES ,  COMMUNICATIONS & POWER IND INC

Inventor： HUEY HUGO E ,  REYSNER PRZEMYSLAW I ,  MIZUHARA YOSUKE M ,  JONGEWAARD ERIK N

IPC: H01P1/08 ,  H01P1/30

公开(公告)号：DE69204509D1

公开(公告)日：1995-10-12

申请号：DE69204509

申请日：1992-03-09

Applicant: VARIAN ASSOCIATES

Inventor： HUEY HUGO E ,  REYSNER PRZEMYSLAW I ,  MIZUHARA YOSUKE M ,  JONGEWAARD ERIK N

IPC: H01P1/08 ,  H01P1/30

公开(公告)号：CA1213054A

公开(公告)日：1986-10-21

申请号：CA412904

申请日：1982-10-06

Applicant: VARIAN ASSOCIATES

Inventor： MIRAM GEORGE V ,  MIZUHARA YOSUKE M

IPC: H01J23/06 ,  H01J23/065 ,  H01J23/087

Abstract: Adjustable-Beam Permanent-Magnet-Focused Linear Beam Microwave Tube A permanent-magnet-focused linear-beam high power millimeter-wave tube is externally adjustable for optimum electron beam optics during initial tube operation. The adjustment is made possible by providing an enlarged cavity within the cathode polepiece within which is housed a confined-flow magnetically-focused electron gun, and a cylindrical insert of magnetic material axially symmetrically disposed about the gun and in spaced relationship to and adjacent the gun insulator envelope. The insert may comprise iron or a radially magnetized permanent magnet, either alone or in combination, and more than one insert of magnetic material may be concentrically employed. In this manner, and by movement of the insert axially within the cavity toward and away from the gun, a finely controllable smooth adjustment of the beam diameter in the beam-microwave interaction region of the tube is effected over a wide range during initial operation. Substantially only the magnetic field in the vicinity of the gun is affected, and essentially no scalloping degradation of the beam in the interaction region is observed.

公开(公告)号：CA2008295A1

公开(公告)日：1990-07-23

申请号：CA2008295

申请日：1990-01-22

Applicant: VARIAN ASSOCIATES

Inventor： MIRAM GEORGE V ,  MIZUHARA YOSUKE M

IPC: H01J1/24 ,  H01J1/15 ,  H01J1/22 ,  H01J9/04 ,  H01J9/08 ,  H01J19/16 ,  H01J23/04 ,  H01J19/06

Abstract: In order to bring a high power vacuum tube to full power in a few seconds, it is necessary to heat the cathode quickly to 1100.degree.C. In large tubes, prior art structures cannot be simply enlarged. A novel cathode structure in which the heater element is anisotropic pyrolytic graphite coated with anisotropic pyrolytic boron nitride for insulation and then sintered to the cathode avoids these problems.