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Design and Fabrication of an Integrated Superconducting Resonator/Flux Concentrator for rf SQUID Magnetometer

Qaderi, Fatemeh | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49876 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fardmanesh, Mahdi
  7. Abstract:
  8. Ultra-sensitive magnetometers based on Radio Frequency Superconducting Quantum Interference Device (rf SQUID), have wide applications in Non-destructive Evaluation (NDE), geophysical measurements and biomagnetic measurements, especially in magnetocardiography (MCG) systems. A superconducting module coupled to rf SQUID is designed to provide a resonance frequency in GHz range (according to the electronic system frequency), as well as concentrating the magnetic flux in the effective area of SQUID. The signal can be measured through a port pumping AC power to the module. The resonator has been also implemented by lumped element tank circuits, but the quality factor of these circuits are usually much lower than superconducting ones due to copper loss. In this project, we propose a superconducting resonator with high quality factor, which is strongly coupled to the rf SQUID. The resonance frequency needs to be between 700 to 900 MHz, which causes the resonator size become relatively large in comparision with the available area on the substrate for the resonator. This fact, in addition to the limited feature size, makes the design more complicated. The flux concentrator pattern is first optimized and then integrated with the resonator pattern on a single dielectric substrate, which is finally attached to the SQUID in flip-chip configuration. A readout from the electronic system feeds the resonator; this can be realized by a coil or a designed transmission line. The HTS YBCO film is deposited or sputtered on a LaAlO3 dielectric substrate and the pattern is etched on it. One of these superconducting modules is fabricated and measured by a network analyzer. In addition, a variety of patterns are simulated and some of them are tested by printed circuit board (PCB) technology. Ultimately, the pattern is upgraded and validated through simulations
  9. Keywords:
  10. Magnetometer ; Superconductor ; Magnetocardiography ; Resonator ; Magnetic Sensor ; Radio Frequency Superconducting Quantum Interference Device (SQUID)

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