Appeal No. 96-1474
Application 08/041,765
cancelled and claims 6 and 7 have been indicated by the examiner
as allowable.
The invention pertains to an electron beam focusing
system for a traveling wave tube (TWT) which provides
substantially no magnetic flux leakage and has improved axial
thermal conductivity.
Representative independent claim 1 is reproduced as
follows:
1. A magnetic focusing system for an electron beam of
a helix traveling wave tube (TWT), comprising:
a focusing structure including a plurality of
polepieces, a plurality of non-magnetic spacers respectively
interlaced between adjacent ones of said plurality of polepieces,
and permanent magnets adjoining outermost ends of each of said
plurality of polepieces, said magnets being magnetized in a
radial direction, a first portion of said plurality of polepieces
being alternatingly disposed orthogonal to a second portion of
said plurality of polepieces;
a beam tunnel enclosed by said plurality of polepieces
and said plurality of spacers, and extending in an axial
direction through said focusing structure for receiving said
electron beam; and
an outer shell encapsulating said focusing structure;
wherein said plurality of polepieces direct magnetic
flux from said magnets to said beam tunnel for focusing of said
beam, and said outer shell provides a return path for said
magnetic flux to said magnets.
The examiner relies on the following references:
Veith et al. (Veith) 2,876,373 Mar. 3, 1959
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