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Task M6: Study of thermo-elastic effects caused by absorption of cosmic rays

Task M6: Study of thermo-elastic effects caused by absorption of cosmic rays. Task M6 plan.  waiting for refrigerator. completed. completed. completed. started. In progress.

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Task M6: Study of thermo-elastic effects caused by absorption of cosmic rays

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  1. Task M6: Study of thermo-elastic effects caused by absorption of cosmic rays ILIAS-GW meeting, 5-6 Nov 2004

  2. Task M6 plan  waiting for refrigerator completed completed completed started In progress Task M6 have completely achieved the milestones. We have already started part of the low temperature measurements, and by the beginning of 2005 we will start the ultralow temperature test and final measurements. ILIAS-GW meeting, 5-6 Nov 2004

  3. unexpected cosmic rays noisenon super-conducting state expected cosmic rays rates EXPLORER 03large statistics NAUTILUS 00 - EXPLORER 02 - - NAUTILUS T > 1K NAUTILUS 98 2003 EXPLORER data are in disagreement with the NAUTILUS datawhen detectors are in non super-conducting state ILIAS-GW meeting, 5-6 Nov 2004

  4. The RAP Experiment Geometric factor thermal and mechanical energy lost Eng2·(dE/dx)2 ·F2n In order to understand: genhancement of Grüneisen factor in super-conducting or low temperature state (dE/dx) enhancement of energy conversion in super-conducting or low temperature state (dE/dx) exotic component of cosmic rays (nuclearites, monopoles) … The thermo-acoustic model has been proven effective at room temperature by previous experiments Rev.Sci.Instrum.71:1345-1354, 2000 and pervious papers ILIAS-GW meeting, 5-6 Nov 2004

  5. Phase 1: 300K test installation and test of full detector at room temperature: suspension, electronics, DAQ, mechanical structure,first measurement at room temperature Suspension: 7 OFHC copper masses 1 OFHC copper tubeAttenuation: –200db@ 5KHz 2 piezo-electric ceramics (PZT24, 1cm2x0.5cm) embedded in the test mass JFET amplifier 1nVHz-1/2@ 5KHz bandwidth 25KHz done in 2003 100 KHz DAQ, controls and Aux I/O measurement/theory = 0.70 +/- 0.11 ILIAS-GW meeting, 5-6 Nov 2004

  6. Phase 2: 300-4K test cryogenic test, and low temperature measurement in non super-conducting state A cryostat failure during the second nitrogen cool down stops the scheduled runs on February. The problem has been recovered in May when RAP started cool down directly in the BTF experimental hall done in 2004 according to the milestones ILIAS-GW meeting, 5-6 Nov 2004

  7. RAP first Cool Down data taking ILIAS-GW meeting, 5-6 Nov 2004

  8. High intensity monitor Beam Charge Monitor (BERGOZ) noise < 550 fC ~ 3*106 e- to QDC (100 fC resolution now improved 25 fC) calibrationcoil ILIAS-GW meeting, 5-6 Nov 2004

  9. Intensity and position monitor fluorescencemonitor beam cherenkov monitor AIRFLY collaboration ILIAS-GW meeting, 5-6 Nov 2004

  10. Data analysis in progress… T ~ 77 K uncertainty in electron number measurement example of data correlationamplitude measured First longitudinal mode amplitude/deposited energy comparison between experimental data and theoryfor pure amorphous Aluminum preliminary ILIAS-GW meeting, 5-6 Nov 2004

  11. Data analysis target • detailed analysis of signal characteristics (timing, noise, calibration, etc) • evaluation on measurement and systematic errors due to beam intensity at low current history @ resonant frequency ILIAS-GW meeting, 5-6 Nov 2004

  12. Conclusion and future plans • Results: • first measure at low temperature. Good agreement with previous experiments (room temperature) and theory. • Work in progress: • back-end software improvements • quasi on-line data monitoring and filtering implementation • accurate data analysis and errors evaluation • Phase 3: • dilution refrigerator delivering by the end of 2004 • installation and characterization (late spring 2005) • measurement in super-conducting state before the end of 2005 • 6 months delay on the planned general schedule of the experiment is due to the dilution refrigerator delivery ILIAS-GW meeting, 5-6 Nov 2004

  13. SPARE ILIAS-GW meeting, 5-6 Nov 2004

  14. Physical Motivation The energy deposited by a particle is converted in a local increase of temperaturedT = dE/(rCV);dp =g·dE/V;g= aY/(rC)g = Grüneisen constant En Eng2·(dE/dx)2 ·F2n The Thermo Acoustic Model predicts very small signalfor present resonant gravitational wave detector sensitivity 1992 NAUTILUS was equippedwith a cosmic ray veto system (LST)Nucl.Instrum.Meth.A355:624-631,1995 2001 EXPLORER was also equipped with a veto system (scintillators) ILIAS-GW meeting, 5-6 Nov 2004

  15. Calibration a v(t) = a x(t) C1= elasticity L1= resonant mass R1= dissipation C2= transducer o piezo-electric capacity ILIAS-GW meeting, 5-6 Nov 2004

  16. signal read-out ILIAS-GW meeting, 5-6 Nov 2004

  17. beam alignment the position of any pulse wasmonitored by a high fluorescence flagtypical spot size @ cryostat entrance ~ 5 mm (sigma) ILIAS-GW meeting, 5-6 Nov 2004

  18. Cryostat failure detail LN2container The cryostat failure was probably due to a not enough thick welding ILIAS-GW meeting, 5-6 Nov 2004

  19. RAP Data Acquisition SCALER ADC INCAA 5758 amplifier STANFORDSR560 4nV*Hz-1/2 LINUX VME controller ADC VMIC 3123 LN-JFET-AMP bar 100 KHz 1nVHz-1/2@ 5KHz bandwidth 25KHz 1 Hz synthesizer 0.3 Mb/s auxiliary channels LabView™run controller & monitor beam trigger ILIAS-GW meeting, 5-6 Nov 2004

  20. first run result (@ 300K) cherenkov beam 18 June 2003 measurement/theory = 0.70 +/- 0.11 ILIAS-GW meeting, 5-6 Nov 2004

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