High Temperature Superconducting Josephson Junction Array Systems

IN PHASE I OF THE PROPOSED EFFORT, WORK WOULD BEGIN ON EXPLOITING HIGH TEMPERATURE SUPERCONDUCTING (HTS) JUNCTION TECHNOLOGIES FOR MM AND SUB-MM ARRAY RADIATION SOURCES OPERATING NEAR TTK. THE JUNCTION TECHNOLOGIES WOULD BE ASSESSED, AND SOME MODIFIED, TO SELECT THE MOST APPROPRIATE FOR ARRAY DEVELOPMENT. ONE AND TWO DIMENSIONAL ARRAYS WILL BE DESIGNED WITH EFFICIENCY, SIZE, AND BANDWIDTH BEING THE MAIN CONCERNS. TEST CIRCUITS WILL BE FABRICATED TESTED. STUDIES WILL BE DONE TO SELECT AN OPTIMAL RADIATIVE STRUCTURE FOR DIRECT RADIATION AND OTHER COUPLING APPLICATIONS (INCLUDING AN ANALYSIS OF THE EXPECTED PERFORMANCE OF THE PASSIVE YBaCuO STRUCTURES AT THE SUBJECT FREQUENCIES). A STUDY WILL ALSO BE DONE OF SEVERAL CANDIDATE APPLICATIONS USING THESE SOURCES IN ILLUMINATED DETECTOR ARRAYS, AN ARRAY TRANSCEIVER (WITH EMBEDDED MODULATORS) AND A STEERED SOURCE/TRANSCEIVER. PHASE I OF THE EFFORT WILL CONCENTRATE ON DESIGNING COMPONENTS/SYSTEMS AND ON PREPARING THE JUNCTION TECHNOLOGIES FOR LARGER SCALE ARRAY USE. PHASE II WOULD INVOLVE FABRICATION AND TESTING OF THE DESIGNED ARRAYS INCLUDING THE DESIGNED RADIATIVE COMPONENTS. ONE OF THE SELECTED SYSTEM APPLICATIONS WOULD ALSO BE BUILT AND TESTED DURING THE PROJECT.