Abstract:
In various embodiments, a traveling wave amplifier circuit is disclosed. The traveling wave amplifier circuit is configured to receive an RF wave and an electron beam. The traveling wave amplifier effects synchronized interaction between the RF wave and the electron beam. The traveling wave amplifier circuit comprises a waveguide. The waveguide comprises a plurality of asymmetric cells arranged periodically. The waveguide is configured to receive an electron beam. Each of the asymmetric cells comprises at least one asymmetrical structure within the asymmetric cell to modify the dispersion relation of the waveguide.
Abstract:
In a crossed-field amplifier tube, an input section of slow-wave circuit is part of the cathode electrode. An output section of slow-wave circuit is part of the anode electrode. The anode circuit is axially displaced from the cathode circuit in the direction of drift of the electron stream so that a non-propagating section of the anode faces at least a part of the propagating cathode circuit.
Abstract:
A crossed field amplifier including a linear, ladder type slow wave devicencluding an array of closely spaced parallel U-shaped rungs with a pair of oppositely wound helices running side-by-side inside said array, and a pair of trimmers running along each side of said array of rungs, the trimmer height at the input or cathode end of said slow wave structure being increased compared to its height for the remainder of said slow wave device.
Abstract:
The allowable gain of a crossed-field amplifier tube is increased by tapering the slow-wave interaction circuit to a smaller spatial period in the direction of circuit power flow. Concurrent variation of the electron beam drift velocity by tapering the dc electric or magnetic field further improves the gain and efficiency.
Abstract:
A microwave signal delay tube is disclosed of the so-called ''''Mtype'''' wherein the modulated electron beam sequentially travels around an inner and outer concentric, circular drift section in opposite directions. The electron beam reversal which takes place after the beam has traveled around one of these sections has the effect of averaging the velocity slip in the beam, brought about by the circular drift geometry of the tube.
Abstract:
The microwave delay apparatus of this invention consists of an M-type travelling wave tube which employs a photocathode illuminated by a light beam amplitude modulated at the signal frequency as the apparatus for forming and injecting the modulated beam into the drift region. This arrangement permits a laminar beam filling the drift space to be launched into the interaction region where the crossed electric and magnetic fields occur. It eliminates the usual electron gun, its associated beam forming electrodes and the input coupler.
Abstract:
In a crossed-field tube of the type employing a cathode secondary emitter, the secondary emission surface is corrugated with the corrugations being elongated generally in the direction of the secondary electron stream to increase the effective secondary electron emissive surface area of the cathode and to increase the secondary electron emission yield from the surface, whereby the current loading on the cathode is decreased in use.
Abstract:
A COLD CATHODE DISTRIBUTED EMISSION REENTRANT TYPE CROSSED FIELD AMPLIFIER IS PROVIDED WHICH POSSESSES ELECTRICAL EFFICIENCES APPROACHING THAT AVAILABLE IN THE REENTRANT TYPE CROSSED FIELD AMPLIFIERS OF THE PRIOR AT BUT WHICH FEATURES THE SIMPLICITY OF THE NON-REENTRANT TYPE CROSSED FIELD AMPLIFIER. A CIRCULAR CONFIGURATION IS USED FOR THE TUBE? ONE IN WHICH THE BEGINNING AND END OF THE INTERACTION REGION IS CONNECTED WITH THE DRIFT SPACE REGION, SO AS TO FORM A COMPLETE ANNULAR PASSAGE ABOUT THE SOLE AND CATHODE. THE MAGNETIC STRUCTURE PRODUCES A MAGNETIC FIELD AT THE PROGRAMMED LEVEL, WHICH MAY BE CONSTANT, IN THE INTERACTION REGION AND IN ADDITION PROVIDES A VARIATION IN THE DRIFT SPACE. AT THE ENTRANCE TO THE DRIFT SPACE AND MAGNETIC INTENSITY DECREASES AS A FUNCTION OF POSITION ALONG THE LENGTH OF THE DRIFT SPACE FROM THE PROGRAMMED LEVEL, GRADUALLY, OVER A PREDETERMINED LENGTH OF THE DRIFT SPACE TO A SECOND LOWER PREDETERMINED INTENSITY. ALONG THE REMAINING LENGTH OF THE DRIFT SPACE THE FIELD INTENSITY INCREASES IN LEVEL UNTIL AT THE END OF THE DRIFT SPACE, COINCIDENT WITH THE BEGINNING OF THE INTER-
ACTION REGION, THE MAGNETIC FIELD INTENSITY IS AGAIN AT THE PROGRAMMED LEVEL. THE TAPERING OF THE MAGNETIC FIELD IN THE DRIFT SPACE REGION IS DESIGNED SO THAT IT DIVERTS SIGNIFICANT AMOUNTS OF THOSE ELECTRONS THAT PASS THROUGH THE INTERACTION REGION AND ENTER THE DRIFT SPACE REGION. HENCE, THE REMAINING ELECTRONS WHICH REENTER THE INTERACTION REGION ARE INSUFFICIENT IN QUANTITY OR ENERGY TO CAUSE SELF-OSCILLATION AFTER THE RF-DRIVE SIGNAL HAS BEEN REMOVED.