Beam refrigeration by means of large cathode magnetic fields used in resistive load and/or with low noise amplifier
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1. AN ELECTRON DISCHARGE DEVICE COMPRISING: A CATHODE FOR PROJECTING AN ELECTRON BEAM ALONG A PREDETERMINED PATH; MEANS CREATING A MAGNETIC FIELD ALONG A PORTION OF AND HAVING FLUX LINES GENERALLY PARALLEL TO SAID PATH; A TRANSVERSE-FIELD ELECTRON COUPLER DISPOSED ALONG SAID PATH PORTION AND EFFECTING INTERACTION BETWEEN TRANSVERSE ELECTRON WAVES ON SAID STREAM AND CIRCUIT WAVES ON THE COUPLER; THE STRUCTURE OF SAID CATHODE IN THE ENVIRONMENT OF SAID DEVICE TENDING TO ESTABLISH AN INITIAL OPERATING TEMPERATURE OF SAID BEAM CORRESPONDING TO A NORMAL EFFECTIVE NOISE TEMPERATURE OF A PREDETERMINED VALUE; AND MEANS CREATING IN THE VICINITY OF SAID CATHODE A MAGNETIC FIELD OF A STRENGTH SUBSTANTIALLY GREATER THAN THAT CORRESPONDING TO SAID INITIAL OPERATING TEMPERATURE AND ESTABLISHING AN ACTUAL EFFECTIVE BEAM NOISE TEMPERATURE OF A VALUE SUBSTANTIALLY LOWER THAN SAID PREDETERMINED VALUE.
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