SQUID developments for the gravitational wave antenna MiniGRAIL

J. Pleikies, O. Usenko, K.H. Kuit, Jakob Flokstra, A. de Waard, A. de Waard, G. Frossati

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We designed two different sensor SQUIDs for the readout of the resonant mass gravitational wave detector MiniGRAIL. Both designs have integrated input inductors in the order of 1.5 muH and are planned for operation in the mK temperature range. Cooling fins were added to the shunt resistors. The fabricated SQUIDs show a behavior that differs from standard DC-SQUIDs. We were able to operate a design with a parallel configuration of washers at reasonable sensitivities. The flux noise saturated to a value of 0.84 muPhi0/radicHz below a temperature of 200 mK. The equivalent noise referred to the current through the input coil is 155 fA/radicHz and the energy resolution yields 62 h.
Original languageUndefined
Pages (from-to)764-767
Number of pages4
JournalIEEE transactions on applied superconductivity
Issue number2
Publication statusPublished - 2007


  • METIS-243146
  • Energy resolution
  • SQUID sensor
  • IR-61501
  • cooling fins
  • gravitational wave antenna
  • resonant mass gravitational wave detector
  • shunt resistors
  • integrated input inductors
  • parallel washer configuration readout system
  • flux noise
  • temperature 200 mK

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