Bombardment-free microwave waveguide window

Claim 1

A WAVEGUIDE WINDOW FOR USE WITHIN A RECTANGULAR WAVEGUIDE SYSTEM WHEREIN BOMBARDMENT OF A WAVE-PERMEABLE WINDOW DISC BY IONS AND ELECTRONS IS SUBSTANTIALLY REDUCED COMPRISING A LENGTH OF CIRCULAR SUPPORT WAVEGUIDE, SAID WAVE-PERMEABLE WINDOW DISC BEING SUPPORTED IN SEALED TRANSVERSE RELATION WITHIN SAID LENGTH OF CIRCULAR SUPPORT WAVEGUIDE AT THE MIDPOINT THEREIN, AN ANNULAR WAVEGUIDE WALL EXTENDING GENERALLY RADIALLY OUTWARD FROM THE ENDS OF SAID CIRCULAR SUPPORT WAVEGUIDE, A CIRCULAR WAVE-GUIDE WALL MEMBER COAXIALLY SECURED TO SEALED RELATION TO THE OTHER CIRCUMFERENCE OF SAID ANNULAR WAVEGUIDE WALL, WHEREIN THE OUTSIDE DIAMETER OF SAID CIRCULAR WAVEGUIDE WALL MEMBER IS APPROXIMATELY TWICE THE DIAMETER OF THE CIRCULAR SUPPORT WAVEGUIDE, SAID ANNULAR WAVEGUIDE WALL AND CIRCULAR WAVEGUIDE WALL MEMBER DEFINING AN ABRUPT TRANSITION REGION HAVING AN ELECTROMAGNETIC FIELD CONFIGURATION WITH A TIME-AVERAGE FORCE ACTING IN A DIRECTION AWAY FROM SAID WINDOW DISC, A LENGTH OF TAPERED WAVEGUIDE SECURED AT ITS LARGE END TO SAID CIRCULAR WAVEGUIDE WALL MEMBER AND AT ITS SMALL END TO THE RECTANGULAR WAVEGUIDE OF THE WAVEGUIDE SYSTEM IN SEALED COAXIAL RELATION THERETO, SAID TAPERED WAVEGUIDES THEREBY INHERENTLY HAVING AN ELECTROMAGNETIC FIELD CONFIGURATION WITH A TIME-AVERAGE FORCE ACTING IN A DIRECTION TOWARDS THE WINDOW DISC BUT COUNTERPOSED BY A FORCE CREATED BY THE ABRUPT TRANSITION REGION WHICH IS GREATER THAN THAT OF THE TAPERED REGION, RESULTINGLY CAUSING PARTICLES APPROACHING THE WAVEGUIDE WINDOW TO EXPERIENCE A NET ACCELERATION IN A DIRECTION AWAY FROM THE WINDOW DISC.