A study of fluxon - traveling-wave interactions

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7149901

Hohenwarter, G K

Interactions between fluxons moving on a long Josephson junction and a traveling electromagnetic wave were investigated. Energy transfer similar to a traveling-wave amplifier tube was expected. Gain and power estimates indicated large gain at low power levels. Requirements include unidirectional motion of individual fluxons or bundles of them and a wave-propagation velocity lower than that of the fluxons. It is demonstrated that both conditions can be met. Impedance matching to low-phase-velocity, low-characteristic impedance lines was pursued. Antipodal finlines and dielectric thickness tapers were evaluated. Small-area Josephson junctions as high-sensitivity, high-frequency detectors could solve the problem of observing the low expected power levels. Analysis of their properties when driven by sources with finite internal impedances revealed limited usefulness when more than one signal is present. This was confirmed by simulations with an electronic Josephson junction analog. Devices allowing for efficient coupling between a long Josephson junction and a slow wave transmission line were fabricated. The required coupling was demonstrated. It was also discovered that a modification of the transmission-line properties resulted.

• Research Organization: Wisconsin Univ., Madison, WI (USA)
• OSTI ID: 7149901
• Country of Publication: United States
• Language: English

Related Subjects

426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC IMPEDANCE
FILMS
IMPEDANCE
INTERACTIONS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FLUX
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
THIN FILMS
TRAVELLING WAVES
WAVE PROPAGATION