D.c. pumped electrostatically focused parametric amplifier

Claim 1

A D.C. PUMPED ELECTROSTATICALLY FOCUSED ELECTRON BEAM PARAMETRIC AMPLIFIER COMPRISING: (A) AN ELECTRON GUN WHICH DEVELOPS A SHEET ELECTRON BEAM, (B) A COLLECTOR LONGITUDINALLY SPACED FROM SAID ELECTRON GUN AND POSITIONED TO RECEIVE AN ELECTRON SHEET BEAM DEVELOPED BY SAID ELECTRON GUN, (C) AN ELECTROSTATIC FAST WAVE INPUT COUPLER POSITIONED ADJACENT SAID ELECTRON GUN TO TRANSFET SIGNAL INPUT ENERGY TO A SHEET ELECTRON BEAM DEVELOPED BY SAID ELECTRON GUN, (D) AN ELECTROSTATIC FAST WAVE OUTPUT COUPLER POSITIONED ADJACENT SAID COLLECTOR TO CONVERT THE TRANSVERSE MOTION OF A SHEET ELECTRON BEAM DEVELOPED BETWEEN SAID ELECTRON GUN AND SAID COLLECTOR INTO AN OUTPUT SIGNAL AND (E) AN ELECTROSTATICALLY FOCUSED D.C. PUMP POSITIONED BETWEEN SAID ELECTROSTATIC FAST WAVE INPUT COUPLER AND SAID ELECTROSTATIC FAST WAVE OUTPUT COUPLER AND CONSISTING OF A PLURALITY OF ELECTROSTATIC FOCUSING LENSES PERIODICALLY SPACED LONGITYDINALLY ALONG THE PATH OF A SHEET ELECTRON BEAM DEVELOPED BETWEEN SAID ELECTRON GUN AND SAID COLLECTOR AND SERVING TO FOCUS AND PREVENT THE SPREAD OF SAID SHEET ELECTRON BEAM, SAID PLURALITY OF ELECTROSTATIC FOCUSING LENSES BEING COMPOSED OF PLANAR ELECTRODES LYING IN PLANES ON EITHER SIDE OF AND PARALLEL TO A CENTRAL PLANE EXTENDING LONGITUDINALLY BETWEEN SAID ELECTRON GUN AND SAID COLLECTOR, THE LENS STRENGTH OF SAID PLURALITY OF ELECTROSTATIC FOCUSING LENSES BEING ABOVE THE CRITICAL VALUE AT WHICH A SHEET ELECTRON BEAM DEVELOPED BETWEEN SAID ELECTRON GUN AND SAID COLLECTOR BECOMES UNSTABLE CAUSING SUCH A SHEET ELECTRON BEAM TO HAVE A NATURAL FREQUENCY OF TRANSVERSE OSCILLATION ABOUT SAID CENTRAL PLANE, THE AMPLITUDE OF SAID TRANSVERSE OSCILLATION INCREASING EXPONENTIALLY ALONG THE LONGITUDINAL LENGTH OF SAID ELECTROSTATICALLY FOCUSED D.C. PUMP, THE LONGITUDINAL SPATIAL PERIODICITY OF SAID PLURALITY OF ELECTROSTATIC FOCUSING LENSES BEING ONE HALF THE WAVELENGTH OF A SHEET ELECTRON BEAM DEVELOPED BETWEEN SAID ELECTRON GUN AND SAID COLLECTOR AT ITS NATURAL RESONANT FREQUENCY WITHIN SAID ELECTROSTATICALLY FOCUSED D.C. PUMP.