Lecture 10

Lecture 10 - HTS Probes Implementation Issues Coupling...

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EE 597E Spring 2007 Lecture 10 HTS Probes HTS Probes Implementation Issues – Coupling –Tun ing – Spoiling – Cloaking
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EE 597E Spring 2007 Lecture 10 Coupling Coupling L s M A A'
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EE 597E Spring 2007 Lecture 10 Effect of Control Loop on Q Effect of Control Loop on Q - - Factor Factor The control loop couples the HTS resonator to the – preamplifier – tuning network – Q-spoil network Q-Factor Observations for a single 50 mm resonator: – 800,000 Î G10 Bracket without control loop – 80,000 Î G10 Bracket with open-circuit control loop Loss mechanism – Eddy currents circulating in the control loop
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EE 597E Spring 2007 Lecture 10 QR Probe Design QR Probe Design - - Tuning Tuning Three general means to tune the probe – permittivity changes – shielding currents – coupled resonators Two methods used in our laboratory – Second HTS resonator provides a large tuning range – Conventional resonant circuit provides fine tuning
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EE 597E Spring 2007 Lecture 10 QR Probe Design QR Probe Design - - Tuning Tuning R r C r L r v r (t) i r (t) L t R t C t i t (t) k v t (t) () ( ) 2 22 2 2 2 1,2 2 41 21 rt r t k k ωω ω + =
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EE 597E Spring 2007 Lecture 10 QR Probe Design QR Probe Design - - Tuning Tuning 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 Inductive coupling, k Mode Frequency [MHz] HTS pair tuning compared to the theoretical model. Theoretical Mode 1 Theoretical Mode 2 Experimental Mode 1 Experimental Mode 2
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EE 597E Spring 2007 Lecture 10 QR Probe Design QR Probe Design - - Tuning Tuning 0 5 10 15 20 25 0 0.15 0.3 0.45 0.6 0.75 0.9 Displacement [mm] Frequency Shift [MHz] 0 6 12 18 24 30 36 Loaded Q Factor × 1000 Mechanical Displacement Tuning Frequency Shift Loaded Q Factor
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EE 597E Spring 2007 Lecture 10 QR Probe Design QR Probe Design - - Tuning Tuning C 7 C 1 Switch Control
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Lecture 10 - HTS Probes Implementation Issues Coupling...

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