Patent ID: 7338683

Claim:
A method of forming a superconductive device, comprising: providing a substrate having a dimension ratio of not less than about 10 2 ; translating the substrate through a deposition zone having an area defined by a first direction and a second direction perpendicular to the first direction; depositing a buffer film to overlie the substrate along the deposition zone while projecting an ion beam at the buffer film in the area; monitoring a spatial ion beam density of the ion beam over the area during depositing the buffer film by translating an at least one ion detector over said area to measure the ion density over said area of the deposition zone, the ion detector comprising a collector for detecting ions from the ion beam and a bias plate overlying the detector through which the ions from the ion beam pass, wherein translating the at least one ion detector is carried out by (i) translating the at least one ion detector in the first direction and the second direction, or (ii) translating an array of the ion detectors in the first direction; controlling an ion to atom arrival ratio throughout the area in response to monitoring the spatial ion beam density, wherein the ion to atom arrival ratio represents the number of ions from the ion beam arriving relative to the number of atoms arriving to form the buffer film; negatively charging the bias plate to substantially screen electrons from the collector; and depositing a superconductor layer to overlie the buffer film.