Task M2 – Working group Auriga-LNLTask M2 – Working group Auriga-LNL
• Operation temperature 0.02-Operation temperature 0.02-300K300K
• Mechanical Attenuation Mechanical Attenuation >180dB in the frequency range >180dB in the frequency range 200-1600 Hz200-1600 Hz
Sub-task: Construction of optical transducer
Present statePresent state
•Cryogenic Test facilityCryogenic Test facility
•Optical readout (now Optical readout (now available)available)
Task M2 – Working group Auriga-LNLTask M2 – Working group Auriga-LNL
Q-Measurements results at Q-Measurements results at 4.2K4.2K
Mode #1: 908 HzMode #1: 908 Hz
Mode #2: 1479 HzMode #2: 1479 Hz
Read-out schemeRead-out scheme
•Mode#1 Q=106
•Mode#2 Q=5.3 x 106
Task M2 – Working group Auriga-LNLTask M2 – Working group Auriga-LNL
First 18 months (starting First 18 months (starting now)now)
Four yearsFour years
1. Room temperature optical bench S<10-5 Hz2/Hz @1kHz
2. Motorized optics mounts for cryogenic alignment
3. Operation at cryogenic temperature
1. Improvement of the mirrors properties: Finesse >105, Al2O3 mirrors
2. Achievement of goal sensitivity to gw (Shh ~10-22 Hz-1/2 )
Task M2 – Working group Auriga-LNLTask M2 – Working group Auriga-LNL
Sub-task:
Present statePresent state
1. k, Q measurements at low T
2. Construction of resonators of CuAl, SiC Be..
1. Cryogenic test facility
2. Optical readout for cryogenic Q-measurements
First 18 months (starting now)First 18 months (starting now)1. Design and construction of the resonators in the kHz region
2. Modification of the cryogenic suspensions to preserve Q
3. Measurements of Q and k at low T
Last time (months 19-24)Last time (months 19-24)
Conclude low temperature measurements
Task M2 – Working group Auriga-LNLTask M2 – Working group Auriga-LNL
Sub-task: Improving fabrication process
Present statePresent state
First 18 months (staring month First 18 months (staring month 12)12)
Last years (months 13-36)Last years (months 13-36)
Cryogenic test facility and optical readout for the Q-measurements
1. Assembling transducer and resonators using different joining procedures as silicate bonding
2. Q-measurement after bonding (kHz region) beginning
1. Low temperature Q and k-measurement after bonding
2. Comparison of the results with the single piece machined resonators
Task M2 – Working group Auriga-LNLTask M2 – Working group Auriga-LNL
Other collaborations with the working groups of the task1. IFN->Limiting bias electric field in the capacitive
transducer and effect of dieletric coating on the thermal noise.
2. ROG,Leiden->Capacitive transducer.
3. All->writing up the final report.