R. De Rosa INFN Napoli For the VIRGO collaboration

Transcription

1 R. De Rosa INFN Napoli For the VIRGO collaboration

2 The lesson of VIRGO+ and VIRGO Science Runs; The Technical Design Report of the Advanced VIRGO project; Conclusion. CSN2 - Frascati, Aprile

3 VSR3 (11 Aug 20 Oct 2010) High Finesse FP cavities; Monolithic suspensions; FromVIRGO to VIRGO+ Decreased performances due to large ROC asymmetry of the end mirrors. VSR4 (3 Jun 3 Sep 2011) Better performances thanks to the improvement of the thermal compensation system. CSN2 - Frascati, Aprile

4 Monolithic suspensions were installed and arm mirrors changed to increase finesse (50 150) and to reduce the thermal noise by replacing the herasil End Mirrors with suprasil ones. Mirror Thermal Compensation has been greatly improved CSN2 - Frascati, Aprile

5 Low cost Short commissioning time Extremely robust With the CHRoCC ITF is robust and stable The interferometer is now tunable and can be a useful chracteristic for ADV-Virgo - The reached sensitivity will allow to set new limit at least on Vela GW emission CSN2 - Frascati, Aprile

6 CSN2 - Frascati, Aprile

7 CSN2 - Frascati, Aprile

8 Initial detectors CSN2 - Frascati, Aprile

9 The Scientific target Ready for the first Science run in W input power 125W i.p Detection horizon : (NS-NS,BH-BH) Ultimate : 140 Mpc NS-NS Insp. Range 1 Gpc BH-BH Range 2

10 Larger vacuum links Heavier Mirrors (42 kg) Marginally stable recycling cavity High finesse (443) of the 3km FP Laser 125 W Waist at the cavity center Signal Recycling (SR) Monolithic suspension CSN2 - Frascati, Aprile

11 Optical simulation and design (OSD); Prestabilized laser (PSL); Injection (INJ); Mirrors (MIR); Thermal compensation (TCS); Detection (DET); Interferometer sensing and control (ISC); Stray light control (SLC); Payloads (PAY); Superattenuator (SAT); Suspended benches (SBE); Vacuum (VAC); Data acquisition, general purpose electronics and software(daq); Infrastructures (INF). CSN2 - Frascati, Aprile

12 Very high power in the cavities. 1363m Larger waists at mirrors to reduce the thermal noise contribution. 125W T=5% 4.9kW 650 kw High quality mirrors and thermal compensation needed. w=48.7 mm T=20% w=58mm CSN2 - Frascati, Aprile

13 FP Cavity Mirrors Input & end Test masses Input TM 350mm RoC = 1420m RoC = 1420m Suprasil ppm/cm 200mm End TM RoC=1883m Suprasil 312

14 Splitter, recycling mirrors Splitter Power & Signal R mirrors 550mm 65mm 350mm Roc=3.6m 100mm Roc=1430m Suprasil 3001 Focusing Recycling M. Suprasil 312,312SV

15 Mirrors coating Flatness : corrective coating New robot for CC Uniformity : planetary motion *Target uniformity 1nm PV, 0.2 nm RMS *Processing of 2 mirrors In the same run for symmetry Project of Sample holder With planetary motion

16 Prestabilized Laser Acoustic enclosure 100W amplifier Beam addition PMC IMC Vacuum Injection bench 125 W 1W 100W amplifier PD Pstab EOM 1W seed Seed suppl y Pump diodes Supply & Servo-loops Electronics cooling 1064 nm monolithic oscillator (Virgo like) as seed laser Frequency and amplitude stabilizations similar to Virgo Beam coherent addition of two 100W amplifiers to get > 125W Noisy electronics outside of laser lab. Amplifier: Rod type Ytterbium Doped fiber

17 PSL Program Recent decisions: Beam addition instead of one 200W amplifier :cost issues and untested noise properties at 200W Double PMC :safe way to avoid large power and intensity intracavity. Schedule: - First 100W amplifier realized and under test; - First 100W system to be delivered and installed in Cascina end 2013; - Second 100W amplifier and beam addition: possibly Beam shape of the HP amplifier for different output powers

18 INJECTION: requirements

19 INJECTION: optical design Beam pointing Beam jitter control Input Power Control Beam Dumps Faraday Isolators Mode Matching Telescopes

20 Stray Light Control

21 The baffles are made of stainless steel with sharp teeth. They are constructed by laser machining and carefully inspected before installation. Noise projections compliant with AdV sensitivity CSN2 - Frascati, Aprile

22 Thermal Compensation Main achievements: CO2 projector Double Axicon System (DAS) and scanning system access to vacuum through the same viewport. Optical layout of the CO2 bench completed. CO2 laser vendor/model selected: LASY-45 from Access Laser Company with LineTracker option for RF cavity length active control through piezo actuator (improves DC power stability). Procurement of the components for the bench top test of the scanning system is completed. Assembly started in March.

23 Thermal Compensation Hartmann wave-front sensing Procurement of the hardware completed. CCD camera: DALSA Pantera 1M60, 1024 by 1024 pixels, active area of 1.2 cm by 1.2 cm, maximum frame rate of 60 fps. Camera-Link digital data protocol. Hartmann plate at EGO for measurement of scattered 1064 nm Phase camera sensing for TCS Simulations for the absolute reconstruction of common and differential aberrations through the information on phase and amplitude of the sidebands and carrier. Use both the 131 MHz and 6 MHz modulation frequency sidebands for coarse and fine TCS tuning. Non symmetric compensation Scanning system based on galvo mirrors for drawing the correction on the mirrors. Noise projection computation for the DAS and the scanning system completed.

24 The TCS and pick-off plates PR Mirror is suspended using C70 steel wires) At 4 cm in front of it, tilted by 6 o with respect to the beam axis, we set a Pick Off Plate for the control of the central cavity. A similar assembly is foreseen for the thermal compensation plates. CSN2 - Frascati, Aprile

25 Suspended Benches An integrated system vacuum chamber (Minitower) + multistage vibration isolator (MultiSAS) has been designed for the new in-vacuum optical benches GAS top filter Inverted pendulum Optical bench GAS bottom filter

26 MultiSAS prototype Inv.Pend. and Geom.AntiSpr filters assembled Filters baking and tuning ongoing Dummy bench under design In-air testing till Sep 2012 Final design by December AdV production from Jan 2013 Suspended Benches Minitower Design for NE minitower approved after production readiness review First article being ordered now Integration test at Nikhef from Sep 2012 First chamber installation by June 2013

27 SAT Long SA Upgrades SAT design of upgraded long SA new F7 body, sensing/control New VAC Vessel and Cond. Pipe Upgrades for SA control: New monolithic InvPend Piezos and LVDTs below IP legs Orders next months Challenging R&D Tiltmeter New Prototype Prototype next months

28 Test bench design for the new scheme: the AdV BS New Payloads Filter 7 Cage Marionetta Filter 7 The design of the BS is now complete and production of a prototype has started Actuators Mirror Cage Mirror Cradle Marionetta with 8 coils, 2 motors, suitable for monolithic clamps improvement, for FP payloads Side Shafts (Mirror actuators and Baffle Holders) The design of the BS is at the base of the design of the other payloads.

29 Infrastructure To reduce the influence of environmental noise some noisy machines will be moved out of the experimental halls. Modifications in the central hall to host the minitowers and upgrade the laser and detection labs. The detection lab will be enlarged and become a clean room. Perspective View of the Central Building with the external Technical Area CSN2 - Frascati, Aprile

30 AdVIRGO Cryotraps Terminal links, 1.2m diameter, shall be removed to install the cryotrap View of a liters LN 2 tank at the North terminal building

31 The choices of the AdV design were made on the basis of the outcome of the different R&D investigations carried out within the gravitational waves (GW) community and the experience gained with Virgo, but also taking into account the budget and schedule constraints. The detailed project schedule is object of a project implementation plan that covers all the necessary tasks until the end of the project. Beside the sensitivity, one of the main goals of the project is to have the detector robustly locked in The phase of installation of AdV parts and decommissioning of the Virgo equipment has started in November 2011 The start of the infrastructure works is scheduled in September CSN2 - Frascati, Aprile