ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Status of the commissioning of the AURIGA detector Luca Taffarello (INFN Sezione di Padova)

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Presentation transcript:

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Status of the commissioning of the AURIGA detector Luca Taffarello (INFN Sezione di Padova) on behalf of AURIGA Collaboration

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Summary of the talk: New detector set-up First Results, calibration and thermal behaviour Investigation of the un-modelled noise peaks Up-conversion of low frequency vibrations Solution of the problem New mechanical isolation at low frequency Result achieved: very stable and gaussian behaviour Duty Cycle 98 % (from 19 th May 2005)

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello new mechanical suspensions: attenuation > 360 dB at 1 kHzFEM modelled new capacitive transducer: two-modes (1 mechanical+1 electrical)optimized mass new amplifier: double stage SQUID 200  energy resolution new data analysis: C++ object oriented codeframe data format Expected target AURIGA II run with upgrades

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello II T = 4.5K = data = simulation Best initial result of II run Noise hunting in cryogenic operation Spurious peaks in the sensitive band High false alarm rate

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Non Stationary Performances F5F5 F5F5 F5F5 F5F5 F1F1 F1F1 F1F1 F1F1 It is possible to classify spurious peaks in correlated “Families” (F1..F5..) in time families appear and dissapear Time (5 hours) Sensitive frequency band

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Measurement of the real part of the impedence seen by the SQUID No evidence of discharge HV  E bias=7.5 MV/m  ‚   = Hz ‚ = Hz  = Hz Calibration: The dissipations of the 3 sensitives modes Q in operation ~ cold-damping Q LV = Q HV = Q LV = Q HV = Q LV = Q HV =

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Calibration: the mechanical transfer function of the antenna VERY IMPORTANT not evident excitation with mechanical and-or electromagnetic actuators A B C A mechanical modes in the transducer charge line B Electromechanical modes C Mechanical modes of the charge plates

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello 894 Hz Spurious peak in the sensitive band SQUID output Hz Seismometer 8-22 Hz Accelerometer Inside vacuum chamber 8-22 Hz 4 days friday-monday Low Frequency Motions are Up-Converted!

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Evidence of the connection between the external (seismic) activity and the spurious peaks excitation in the sensitive band 1DAY1DAY OUTPUT of SEISMOMETER on top of the cryostat 0-22 Hz sensitive bandwidth to determine a correlation between the external disturbances and the response in the sensitive bandwidth Evidence for nolinear behaviour

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Run 590 (Time-Frequency) from Sat 11h-13/11/04 to Mon 12h-15/11/04 Clean Raw Data Noisy Raw Data Sat Sun Mon Only during the Sunday nigth it is possible to get clean spectra The duty cycle “gaussian and stationary” very poor 20 %, evidence of effects of Human Activity

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Low frequency mechanical excitation and response in the detector bandwidth 2 example also without electrical field Shaking frequency Hz Effect: all the multiple Shaking frequency Hz Effect: some cluster with more peaks equidistant 16.57/3 Hz Not possible to reach shaking frequency below 10 Hz the seismic noise is too power

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Strategy: new mechanical isolation at low frequency Step 1:Dissipation stacks material: Polyurethane (Sylodamp by Angst Pfister), high dissipation Q=2 roll-off frequency 8-10 Hz Step 2:Active-air mounts (Vibraplane by Kinetic Systems) internal damping Q=2 lower natural frequencies 1-2 Hz, automatic leveling/height control Hardware up-grades integrated during cryogenic operations

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Position control feed-back lift used with the liquid helium inside the dewars STEP 1: rubber stacks between floor and cryostat supports 2 Dec. 2004

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello First breakthrough : achieved design sensitivity (Dec 2004) 60% DUTY CYCLE !!! Go ahead !!

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello F5 Veto /- 0.2 Hz F Hz F5 Veto

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello F5 Threshold veto F5 Noise /- 0.2 Hz F5 Veto amplitude

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello AURIGA Events [no vetoes] SNR Italian Holiday

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello AURIGA Events AFTER vetoes SNR Is possible to apply the epoch vetoes and the result is a duty cycle 60 %

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello SNR Distribution AFTER vetoes (Simulation=Red) SNR 3 events with SNR >10 during 9 days

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Second Step: seismic isolation up-grade external suspensions low frequency with vibrational damping Air springs: effective above 1-2 Hz

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Metal-arc welding on cryostat while keeping liquid helium in “wings” to support Auriga above the center of mass of the cryostat

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Step 2: integration of low frequency suspensions (May 19 th ) Final configurationFerroconcrete Pillar

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello “Before the up-grade” “After the up-grade” Last breakthrough : achieved 98% Duty Cycle (May 2005)

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello On line effect (May 19 th ) suspension activation 1 hour Sensitive frequency band

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Low frequency motion comparison

ILIAS GW Meeting Mallorca - October 23-24, 2005Luca Taffarello Absolute amplitude / Hz Current AURIGA Burst Search Thermal at 4.5 K 13.6 days, Epoch vetoes not needed apart from cryogenic maintenance Duty time 98% Very stationary Gaussian noise Outliers 9 events/day with SNR > 6 Event rate 3700 /day with SNR > 4