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C2:Cryogenic suspension system for advanced resonant detectors (5 MIN)

C2:Cryogenic suspension system for advanced resonant detectors (5 MIN).

vernon-rowland
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C2:Cryogenic suspension system for advanced resonant detectors (5 MIN)

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  1. C2:Cryogenic suspension system for advanced resonant detectors (5 MIN) The double task of removing the heat from the antenna resonator while keeping it mechanically isolated from the environment is similar to the one that will be encountered in the cooling of the interferometer mirrors. Although the ultra cryogenic detectors have been successfully operated, further advances in cooling and/or isolating the antenna can be achieved via finite element modelling and experimental tests. Objective: - Two 1.2 ton spheres with their cryogenic suspension assembled and measurements of mechanical quality factor and thermal noise at low temperatures performed. Task -C2: development and construction of advanced cryogenic system for resonant detectors; Participants: INFN* - Istituto Nazionale di Fisica Nucleare MiniGRAIL - Leiden University – LION Institute of Physics *Involved labs: Ferrara, Firenze, Genova, Frascati, Legnaro, Napoli, Padova, Perugia, Pisa, Roma 1, Roma 2, Trento, Urbino

  2. C2:Cryogenic suspension system for advanced resonant detectors (5 MIN)

  3. C2:Cryogenic suspension system for advanced resonant detectors (5 MIN) Cooling MiniGRAIL 78 mK after 37 days. Heat leak of about 50 microW-Hydrogen? Internal stresses?

  4. MiniGRAIL Material CuAl6% Diameter  = 0.65 m Mass M = 1150 kg Resonant freq. f = 3160 Hz Goal temperature ~ 20 mK Expected sensitivity h~10-20

  5. Vibration Isolation System

  6. Vibration Isolation System

  7. Vibration Isolation System 30 dB around 3 kHz 70 dB around 3 kHz

  8. Vibration Isolation System

  9. Vibration Isolation System

  10. Vibration Isolation System

  11. Vibration Isolation System

  12. To still shield To 50 mK shield To mixing chamber CryogenicsThermal anchoring suspension

  13. CryogenicsThermal anchoring suspension

  14. C2:Cryogenic suspension system for advanced resonant detectors (5 MIN)

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