1 / 18

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.

frieda
Download Presentation

Status of MiniGRAIL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related