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Accession Number:
AD0269309
Title:
WEAK-BEAM PHASE-BRIDGE MEASUREMENT OF INTERACTION IMPEDANCE
Corporate Author:
STANFORD UNIV CALIF STANFORD ELECTRONICS LABS
Report Date:
1960-07-29
Abstract:
A weak electron beam is operated at full circuit voltage to perturb the phase delay along a slow-wave structure. The beam current is typically on the order of one-thirtieth of Kompfner-dip current or backward-wave startoscillation current. The phase perturbation is measured on a simple phase bridge made of ordinary standing-wave-measurement equipment. The circuit-interaction impedance is calculated from this datum. Space-charge effects can be neglected without error. Since the beam is a velocity-sensitive perturbation, it can distinguish between different space-harmonic waves, between backward and forward waves, and between modes on some multimode circuits. Circuits intended for pulsed high-power operation can be perturbed with d-c beams without exceeding their dissipation ratings. Weak-beam data are compared favorably with forward-wave and backward-wave impedance data taken by the conventional methods on a tape helix. The weak-beam data are probably more reliable because of the lack of space-charge effects. Author
Pages:
0001
File Size:
0.00MB
