Task M2 – Working group Auriga-LNL Operation temperature 0.02-300KOperation temperature 0.02-300K Mechanical Attenuation >180dB in the frequency range.

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Presentation transcript:

Task M2 – Working group Auriga-LNL Operation temperature KOperation temperature K Mechanical Attenuation >180dB in the frequency range HzMechanical Attenuation >180dB in the frequency range Hz Sub-task: Construction of optical transducer Present state Cryogenic Test facilityCryogenic Test facility Optical readout (now available)Optical readout (now available)

Task M2 – Working group Auriga-LNL Q-Measurements results at 4.2K Mode #1: 908 Hz Mode #2: 1479 Hz Read-out scheme Mode#1 Q=10 6 Mode#2 Q=5.3 x 10 6

Task M2 – Working group Auriga-LNL First 18 months (starting now) Four years Four years 1. 1.Room temperature optical bench S nn <10 -5 Hz Motorized optics mounts for cryogenic alignment 3. 3.Operation at cryogenic temperature 1. 1.Improvement of the mirrors properties: Finesse >10 5, Al 2 O 3 mirrors 2. 2.Achievement of goal sensitivity to gw (S hh ~ Hz -1/2 )

Task M2 – Working group Auriga-LNL Sub-task: Present state k, Q measurements at low T 2. 2.Construction of resonators of CuAl, SiC Be Cryogenic test facility 2. 2.Optical readout for cryogenic Q-measurements First 18 months (starting now) 1. 1.Design and construction of the resonators in the kHz region 2. 2.Modification of the cryogenic suspensions to preserve Q 3. 3.Measurements of Q and k at low T Last time (months 19-24) Conclude low temperature measurements

Task M2 – Working group Auriga-LNL Sub-task: Improving fabrication process Present state First 18 months (staring month 12) Last years (months 13-36) Cryogenic test facility and optical readout for the Q-measurements 1. 1.Assembling transducer and resonators using different joining procedures as silicate bonding 2. 2.Q-measurement after bonding (kHz region) beginning 1. 1.Low temperature Q and k-measurement after bonding 2. 2.Comparison of the results with the single piece machined resonators

Task M2 – Working group Auriga-LNL Other collaborations with the working groups of the task 1. 1.IFN->Limiting bias electric field in the capacitive transducer and effect of dieletric coating on the thermal noise ROG,Leiden->Capacitive transducer All->writing up the final report.