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Status of MiniGRAIL

Status of MiniGRAIL. G. Frossati, A.de Waard, L.Gottardi and O.Usenko Kamerlingh Onnes Laboratory Leiden, The Netherlands. ESF exploratory workshop: Toward a 3 rd generation European Gravitational Wave Observatory Perugia, 21-23-Sept. 2005. Advantages of Spheres.

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Status of MiniGRAIL

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  1. Status of MiniGRAIL G. Frossati, A.de Waard, L.Gottardi and O.Usenko Kamerlingh Onnes Laboratory Leiden, The Netherlands ESF exploratory workshop: Toward a 3rd generation European Gravitational Wave Observatory Perugia, 21-23-Sept. 2005

  2. Advantagesof Spheres • Large cross section compared with a traditional bar detector • Omni-directional • Determine direction and polarization (TIGA) • Short cool-down time • Relatively cheap • Toroidal modes could be used as vetoes for non-GW signals.

  3. www.minigrail.nl MiniGRAIL Material CuAl6% Diameter  = 0.68 m Mass M ~ 1400 kg Resonance freq. 2850/3050 Hz Aimed temperature ~ 20 mK QL sensitivity h~4x10-21 QL spectral amplitude ĥ~4.5x10-23

  4. Sensitivity Minimum detectable energy Teff=T/Q +2TN For a SQUID noise energy of one quantum Need~0.05; Q~2x106: T~30 mK

  5. MiniGRAIL

  6. Liquid N2 77K (-196 ºC) Liquid He 4K (-269 ºC) Dilution refrigerator (10 mK) MiniGRAILCryogenics cryostat

  7. Kamerlingh Onnes LaboratoryUltra-low temperature lab MiniGRAIL cryostat

  8. MiniGRAILSeismic isolation ~ 50 dB

  9. MiniGRAILCryogenics

  10. electrode mass (~ 200 g) spring membrane Closed Membrane Capacitive Transducer CuAl6% • Advantages: • Compact design • Easy to make d~30 micro m VBIAS up to 500 V

  11. New one or two-modes transducer

  12. second SQUID first SQUID transformer Very low noise amplifier; 2-stage SQUID

  13. 1.5 x 10-20 MiniGRAIL sensitivity - run 6

  14. 4.5 x 10-22 MiniGRAIL sensitivity - run 6 Teff = 40 K

  15. MiniGRAIL sensitivity - comparison MiniGRAIL run6 MiniGRAIL expected run 8 NAUTILUS / EXPLORER AURIGA GEO 05 LIGO S3 Initial target large interferometers

  16. Run 8: resonance spectrum at 200V

  17. Next: 33 ton sphere ? Project together with the Roma group to be submitted to INFN hQL≈4x10-24/√Hz hQL≈4x10-23/√Hz

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