Monochromatic radio frequency accelerating cavity
AssigneeThe United States of America as represented by the United States Department of Energy
InventorSalvatore Giordano
Life of this patent
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Abstract
A radio frequency resonant cavity having a fundamental resonant frequency and characterized by being free of spurious modes. A plurality of spaced electrically conductive bars are arranged in a generally cylindrical array within the cavity to define a chamber between the bars and an outer solid cylindrically shaped wall of the cavity. A first and second plurality of mode perturbing rods are mounted in two groups at determined random locations to extend radially and axially into the cavity thereby to perturb spurious modes and cause their fields to extend through passageways between the bars and into the chamber. At least one body of lossy material is disposed within the chamber to damp all spurious modes that do extend into the chamber thereby enabling the cavity to operate free of undesired spurious modes.
Claims12
A radio frequency resonance cavity that supports a fundamental resonant frequency and that is free of spurious modes, comprising, wall means defining a resonant cavity having inlet and outlet apertures and further defining a chamber around a predetermined portion of said resonant cavity, said wall means still further defining passageways through the radially inner wall of said chamber for enabling spurious modes to extend from the cavity through the passageways and into the chamber, lossy material disposed in said chamber for damping said spurious modes, and a plurality of rods mounted at random loci on the inner walls of said cavity thereby to dispose the rods to extend into the cavity where they perturb all remaining spurious modes and cause there fields to excite said chamber and be damped therein by said lossy material, whereby electro-magnetic energy having a fundamental resonant frequency equal to that of the cavity can enter the cavity through said inlet aperture and leave the cavity through said oulet aperture without being substantially affected by spurious modes.
A radio frequency resonance cavity that has a fundamental resonant frequency and that is free of spurious modes, comprising, a cylinder defined by first and second generally circular end walls each having wall means defining an aperture through and coaxial with its center, a cylindrically shaped solid outer wall each axial end of which is connected, respectively, to one of said circular end walls adjacent to the periphery thereof, and a plurality of bars arranged in a generally cylindrical array with their opposite ends each, respectively, spaced from immediately adjacent bars and secured to one of said circular end walls at a preselected point thereon between the circumference of the end wall and its center, said cavity further comprising a hollow resonant stem having one of its ends mounted on said first end wall coaxially with said cylindrical array of bars and having its free end spaced a given distance from said second end wall to define a gap therewith, at least one body of lossy material disposed between said outer wall and the array of bars to damp spurious modes that extend into the spaces between the bars, a first plurality of rods each mounted on a respective selected one of said bars for perturbing spurious modes to cause their fields to extend into the lossy material and be damped by it, and a second plurality of rods each mounted on said first end wall for perturbing essentially all remaining spurious modes to enable said lossy material and said first and second plurality of rods to be effective in combination with said array of bars to eliminate or substantially damp all spurious modes without damping the fundamental resonant frequency of the cavity.
Dependencies are inferred from the claim text.