II. Applications of the Josephson Effect

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R. Gross, A. Marx, and F. Deppe © Wal<strong>the</strong>r-Meißner-Institut (2001 - 2013) Summary negligible screening ¯L = 2LI c /© 0 ¿ 1 © » © ext strong damping: large screening ¯L = 2LI c /© 0 À 1 © = © ext + LI cir » n© 0 intermediate ¯L: I sm (© ext ) self-consistently from ©(© ext ) and I sm (©) performance: optimum operation (¯L » 1, ¯C » 1): operation in flux-locked-loop as null detector AS-Chap. 4 - 71
R. Gross, A. Marx, and F. Deppe © Wal<strong>the</strong>r-Meißner-Institut (2001 - 2013) Summary (rf-SQUID) operation: inductive coupling to tank circuit performance: operation in flux-locked-loop as null detector Summary (SQUID based instruments) • antenna, SQUID (flux-to-voltage transformer), read-out electronics • magnetometer, gradiometer, voltmeter, susceptometer, … • magnetic field resolution: few fT/(Hz) 1/2 • application: magnetocardiography/-encephalography, NDE, microscopy, geophysics AS-Chap. 4 - 72
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II. Applications of the Josephson Effect

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