SQUIDs - Low Temperature Laboratory

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LLNL Axion Detector • Current system noise temperature: T S = T + T N ≈ 3.2 K Cavity temperature: T ≈ 1.5 K Amplifier noise temperature: T N ≈ 1.7 K • Time to scan the range of frequencies from f 1 to f 2 : τ(f 1 ,f 2 ) ≈ 4 x 10 16 (T S /1 K) 2 (1/f 1 –1/f 2 ) sec For f 1 = 0.24 GHz, f 2 = 2.4 GHz: τ ≈45 years • Note: There is only a factor of 2 to be gained in T S by reducing T unless T N is also reduced.
Microstrip SQUID Amplifier Conventional SQUID Amplifier Microstrip SQUID Amplifier • Source connected to both ends of coil • Source connected to one end of the coil and SQUID washer; the other end of the coil is left open
Page 1 and 2: SQUIDs: From Cosmology to Magnetic
Page 3 and 4: Milestones in Superconductivity 191
Page 5 and 6: The Discovery of Superconductivity
Page 7 and 8: Zero Resistance Magnetic field •
Page 13 and 14: Flux Quantization Φ = n Φ 0 J Φ
Page 15 and 16: • Cooper pairs tunnel through bar
Page 17 and 18: Temperature (Kelvin) Transition Tem
Page 21 and 22: The dc Superconducting Quantum Inte
Page 23 and 24: B N ~ 1 fT Hz -1/2 Superconducting
Page 25 and 26: Applications of SQUIDs: An Overview
Page 27 and 28: Neuromag ® 306-Channel SQUID Syste
Page 29 and 30: CardioMag Imaging System for Magnet
Page 31 and 32: 2G Superconducting Rock Magnetomete
Page 33 and 34: MAGMA-C1 Scanning SQUID Microscope
Page 35 and 36: Courtesy Stanford University and NA
Page 37 and 38: Searching for Axions: The Microstri
Page 39 and 40: Resonant Conversion of Axions into
Page 41: Noise Temperature R T -A [ T + T (
Page 45 and 46: Noise Temperature of Microstrip Amp
Page 47 and 48: Summary • Gain ≥ 20 dB for freq
Page 49: Energy z B 0 Nuclear Magnetic Reson
Page 52 and 53: Timeline Michael Crichton, 1999 “
Page 57 and 58: Three dimensional images of pepper
Page 59: B = 13.2 mT int T 1 contrast images
Page 62: Future directions for low-field MRI

SQUIDs - Low Temperature Laboratory

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