An Ultra High Quality Factor Radio Frequency SQUID Magnetometer Based on a Liquid Helium Cooled Quartz Resonator

Prance, H, Whiteman, R, Schollmann, V and Prance, R J (1997) An Ultra High Quality Factor Radio Frequency SQUID Magnetometer Based on a Liquid Helium Cooled Quartz Resonator. In: 3rd European Conference on Applied Superconductivity EUCAS'97: Institute of Physics Conference Series, VELDHOVEN, NETHERLANDS, JUN 30-JUL 03, 1997.

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Abstract

We discuss a technique for coupling a single weak link SQUID ring to a very high quality factor (Q) external resonator. For this purpose, we make use of a radio frequency (20MHz) quartz crystal compatible with liquid helium operation Knowing the equivalent circuit of the resonator, we have been able to design the proper inductive coupling between it resonator and the SQUID ring. We provide an experimental example of this system utilizing a niobium point contract ring coupled to a 4.2K quartz crystal with a loaded Q of 10(5). We consider the application of these narrow band systems to magnetometer arrays where it is essential that cross talk between elements in the arrays be minimised.

Item Type: Conference or Workshop Item (Paper)
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Helen Prance
Date Deposited: 06 Feb 2012 21:25
Last Modified: 24 Jun 2015 12:38
URI: http://sro.sussex.ac.uk/id/eprint/31165
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