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Improved sensitivity of planar microwave based RF-SQUIDs using a cryogenic HEMT preamplifier

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7 Author(s)
Fontana, G. ; Dipartimento di Fisica, Trento Univ., Italy ; Mezzena, R. ; Vitale, S. ; Cerdonio, M.
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The design and performance of a planar microwave RF-SQUID (superconducting quantum interference device) read out by a cryogenic high-electron-mobility-transistor (HEMT) preamplifier are described. The SQUID sensor consists of a planar half-wavelength microstrip resonator, into which the SQUID loop is integrated. The SQUID is operated at a pump frequency of 1.7 GHz. The cryogenic preamplifier uses a microwave HEMT, located close to the SQUID sensor. Measurements of the flux noise and the fractional step rise parameter were carried out in the temperature range between 4.2 K and 1.5 K. In an open loop, a flux noise of 2*10/sup -6/ Phi /sub 0// square root Hz was measured at 4.2 K, resulting in an energy resolution of about 100 h. The design of a 3-GHz magnetometer is also described, and the preliminary results of the measurements are reported.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 1 )