logging in or signing up Tue1720 157bis Danior Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 24 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: October 30, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Approaching the quantum limit with a new read-out on EXPLORER and NAUTILUS: Approaching the quantum limit with a new read-out on EXPLORER and NAUTILUS Alessio Rocchi University of Rome “Tor Vergata” and INFN Roma 2 for the ROG Collaboration 6th Edoardo Amaldi Conference on Gravitational Waves Okinawa, June 20-24, 2005 www.lnf.infn.it/esperimenti/rog Alessio.Rocchi@lnf.infn.itSlide2: MiniGrail INFN Frascati CERN RE 5Slide3: EXPLORER and NAUTILUS Duty cycle more than 90% <Tnoise>NAU = 2 mK h = 3 10-19 10-4 Mo at Galactic Centre Strain sensitivity of EXPLORER and NAUTILUS Talk by M. Visco this morning Single gap transducers (gap ≈ 10μm) and single-stage dc SQUIDS (ε ≈ few thousand ħ)Slide4: β, transduction efficiency Tn, noise temperatureDouble-gap transducer: Double-gap transducer Actual gap on NAUTILUS transducer ≈ 9μmPreliminary results on the Double-gap transducer: Preliminary results on the Double-gap transducer Minenkov, J. Phys. D: Appl. Phys. 33, 1134–1136 (2000) @ T=4.2 K, Q = 1.5·106, Upol ≈ 200 V gap ≈ 10 μm gap ≈ 20 μmSlide7: The ROG 2-stage SQUID amplifier Quantum Design dc SQUID ROG dc SQUID Carelli et al., Appl. Phys. Lett. 72, 115 (1998) Slide8: Open input noise measurement of the ROG 2-stage SQUID amplifier Energy resolution 30ħ around 1kHz @ 4.2KSlide9: High-Q input circuit (L0=96mH, Q0=0.7·106, k=0.38). f0= 1740 Hz Lf 300K 4.2K 1 see Vinante et al., Physica C 368, 176-180 (2002) Working point stabilization via cold-damping network1Slide10: Energy resolution vs temperature @ T=2.0 K, the flux noise is 0.21μΦ0/√Hz corresponding to 70ħ Slide11: Next Steps Investigate temperatures below 2 K; Increase the transformer coupling; Measurement of back-action to estimate noise temperature Tn; Couple the system to the double gap transducer. Slide12: Expected Sh for NAUTILUS @ 0.12K, double gap transducer (11 μm and Q=1.5·106) and double SQUID (L0=2.5 H, k=0.7, Φn= 0.16μΦ0/√Hz). Teff ≈ 7μK (corresponding to h=2.1·10-20), sensitivity < 1·10-21 /√Hz over 35Hz. 3·10-22Slide15: Carelli et al. 98 You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Tue1720 157bis Danior Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 24 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: October 30, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Approaching the quantum limit with a new read-out on EXPLORER and NAUTILUS: Approaching the quantum limit with a new read-out on EXPLORER and NAUTILUS Alessio Rocchi University of Rome “Tor Vergata” and INFN Roma 2 for the ROG Collaboration 6th Edoardo Amaldi Conference on Gravitational Waves Okinawa, June 20-24, 2005 www.lnf.infn.it/esperimenti/rog Alessio.Rocchi@lnf.infn.itSlide2: MiniGrail INFN Frascati CERN RE 5Slide3: EXPLORER and NAUTILUS Duty cycle more than 90% <Tnoise>NAU = 2 mK h = 3 10-19 10-4 Mo at Galactic Centre Strain sensitivity of EXPLORER and NAUTILUS Talk by M. Visco this morning Single gap transducers (gap ≈ 10μm) and single-stage dc SQUIDS (ε ≈ few thousand ħ)Slide4: β, transduction efficiency Tn, noise temperatureDouble-gap transducer: Double-gap transducer Actual gap on NAUTILUS transducer ≈ 9μmPreliminary results on the Double-gap transducer: Preliminary results on the Double-gap transducer Minenkov, J. Phys. D: Appl. Phys. 33, 1134–1136 (2000) @ T=4.2 K, Q = 1.5·106, Upol ≈ 200 V gap ≈ 10 μm gap ≈ 20 μmSlide7: The ROG 2-stage SQUID amplifier Quantum Design dc SQUID ROG dc SQUID Carelli et al., Appl. Phys. Lett. 72, 115 (1998) Slide8: Open input noise measurement of the ROG 2-stage SQUID amplifier Energy resolution 30ħ around 1kHz @ 4.2KSlide9: High-Q input circuit (L0=96mH, Q0=0.7·106, k=0.38). f0= 1740 Hz Lf 300K 4.2K 1 see Vinante et al., Physica C 368, 176-180 (2002) Working point stabilization via cold-damping network1Slide10: Energy resolution vs temperature @ T=2.0 K, the flux noise is 0.21μΦ0/√Hz corresponding to 70ħ Slide11: Next Steps Investigate temperatures below 2 K; Increase the transformer coupling; Measurement of back-action to estimate noise temperature Tn; Couple the system to the double gap transducer. Slide12: Expected Sh for NAUTILUS @ 0.12K, double gap transducer (11 μm and Q=1.5·106) and double SQUID (L0=2.5 H, k=0.7, Φn= 0.16μΦ0/√Hz). Teff ≈ 7μK (corresponding to h=2.1·10-20), sensitivity < 1·10-21 /√Hz over 35Hz. 3·10-22Slide15: Carelli et al. 98