. The Bell System technical journal . VOLTAGE V (= 2V) MAGNETIC FIELD B ^2B) ^-o/ MAX. ELECTRONIC ^.q, ^° EFFICIENCY (Fje) ^ Fig. 18.—Approximate orbits of electrons which transfer energy to the RF field, plottedfor operation of a plane magnetron at two different magnetic fields. It is shown how therelative kinetic energy gained beyond the last cusp and dissipated at the anode de-creases as the magnetic field and voltage of operation are increased, resulting in increasedefficiency of electronic conversion of energy from the DC field to the RF field. Thetwo illustrative cases differ by a factor
. The Bell System technical journal . VOLTAGE V (= 2V) MAGNETIC FIELD B ^2B) ^-o/ MAX. ELECTRONIC ^.q, ^° EFFICIENCY (Fje) ^ Fig. 18.—Approximate orbits of electrons which transfer energy to the RF field, plottedfor operation of a plane magnetron at two different magnetic fields. It is shown how therelative kinetic energy gained beyond the last cusp and dissipated at the anode de-creases as the magnetic field and voltage of operation are increased, resulting in increasedefficiency of electronic conversion of energy from the DC field to the RF field. Thetwo illustrative cases differ by a factor two in DC voltage and hence by the same factorin magnetic field and diameter of the rolhng circle. The increase of electronic efficiency with voltage, and hence magneticfield, may be explained by the picture of electron motions in the interactionspace. The highest electronic efficiency is attained when the electronsreaching the anode do so with least kinetic energy. For the approximateorbit of Fig. 12, the energy lost at the anod
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
