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Development of Low Temperature SQUID Gradiometer Array for Metallic Magnetic Microcalorimeters
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Development of Low Temperature SQUID Gradiometer Array for Metallic Magnetic Microcalorimeters
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Development of Low Temperature SQUID Gradiometer Array for Metallic Magnetic Microcalorimeters
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Journal Article
Development of Low Temperature SQUID Gradiometer Array for Metallic Magnetic Microcalorimeters
2008
Overview
We report on the performance of two types of SQUID gradiometers developed for the readout of magnetic calorimeters. Our previously developed low dissipation SQUID gradiometer optimized for low temperature operation has demonstrated the flux noise level of
under a magnetic field of 2.5 mT and 150 mK. With a cylindrical Au:Er paramagnetic sensor mounted inside the octagonal pickup washer of the SQUID gradiometer, we succeeded in detecting X-ray signals. However, our achieved energy resolution was 47.2±2.1 eV at 5.9 keV limited by the high operating temperature of 150 mK and by a magnetic field, small for that temperature, due to the limited critical current of the field coils. Based on these results, we fabricated new arrays of SQUID gradiometer by tuning the line width and the number of turns of the field coils and shunt resistance to realize a lower noise level and a larger magnetic field. Furthermore, arrays of SQUID gradiometer with meander patterned pickup washer was fabricated which provides a stronger coupling between the paramagnetic sensor and the pickup washer, and a larger magnetic field at the sensor.
Publisher
Springer Science and Business Media LLC,Springer US
