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Anomalous R. F. induced steps in resonant Josephson tunnel junctions for voltage standard maintenance

Conference · · IEEE Trans. Magn.; (United States)
OSTI ID:5918221
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The authors have theoretically investigated the current steps in the I-V characteristics of a long Josephson tunnel junction driven by microwaves at frequencies near its geometrical resonance. For this purpose they use a numerical computation algorithm based on a lossy transmission line model of the Josephson tunnel junction to calculate the d.c. current density distribution. In addition to the fundamental microwave frequency, harmonic contents of the tunneling current are also considered. The calculations show a strong asymmetric behaviour of the current steps with respect to the quasi particle curve. Their detailed studies imply that the excitation of higher harmonic waves gives rise to these anomalous microwave induced steps. Due to the non-uniform d.c. tunneling current density distribution the amplitudes of these current steps are not usually larger than 10% of the critical current. As in long junctions the critical current is in the order of milliamps, these amplitudes are considered relatively large.

Research Organization:
Institute of High Frequency Engineering, Technical Univ. of Braunschweig, D-3300 Braunschweig (DE)
OSTI ID:
5918221
Report Number(s):
CONF-880812-
Journal Information:
IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
Country of Publication:
United States
Language:
English

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Related Subjects

200303 -- Power Transmission & Distribution-- Superconducting & Cryogenic Systems-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
420201* -- Engineering-- Cryogenic Equipment & Devices
656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALGORITHMS
CABLES
COMPUTER CALCULATIONS
CONDUCTOR DEVICES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
DATA
DESIGN
ELECTRIC CABLES
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
EQUIPMENT
FREQUENCY MIXING
HARMONIC GENERATION
INFORMATION
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL LOGIC
MICROWAVE RADIATION
NUMERICAL DATA
NUMERICAL SOLUTION
PERFORMANCE
RADIATIONS
RF SYSTEMS
SUPERCONDUCTING CABLES
SUPERCONDUCTING JUNCTIONS
THEORETICAL DATA
TUNNELING
VOLTAGE REGULATORS