II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
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)<br />
4.2.2 Operation and Performance <strong>of</strong> rf SQUIDs<br />
AS-Chap. 4 - 34<br />
operation <strong>of</strong> rf-SQUIDs:<br />
- SQUID loop inductively coupled to LC tank circuit<br />
- quality factor Q = R T /! rf L T<br />
! rf2 = 1/L T C T<br />
- mutual inductance M = ®(L T L) 0.5<br />
- rf current in tank circuit: I T = QI rf<br />
for ¯L,rf < 1:<br />
©(© ext ) non-hysteretic<br />
rf-SQUID as nonlinear inductor<br />
periodic modulation <strong>of</strong> resonance frequency (L T,eff C T ) -1/2<br />
operation close to resonance frequency: strong change in rf-voltage
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