Virgo - EGO

Francesco Fidecaro

Tokyo, November 5, 2010

2

The Virgo Collaboration• Early efforts

– Brillet (optics)– Giazotto (suspensions)

• Collaboration started in 1992• LAPP Annecy• EGO Cascina• Firenze-Urbino• Genova• Napoli• OCA Nice• NIKHEF Amsterdam• LAL Orsay• LMA Lyon• APC Paris – ESPCI Paris• Perugia• Pisa• Roma La Sapienza• Roma Tor Vergata• Trento-Padova• IM PAN Warsaw• RMKI Budapest• LKB Paris• 18 groups• About 200 authors

5

marionetta

mirror

Superattenuator performance• Excitation at top• Use Virgo sensitivity

and stability• Integrate for several

hours• Upper limit for TF at

32 Hz:1,7 10-12

• In some configurations a signal was found, but also along a direction perpendicular to excitation: compatible with magnetic cross talk

6

Coating facility – LMA Lyon ESPCI Paris• Dedicated investment by Virgo• Large area coating• Metrology• Corrective coating procedure

7

The Virgo interferometer (now Virgo+)

9

TCS optical layout

STAC/Council June 2008 9

L4

2" Hot mirrorL2M

AXICON

L1

L8L7

LASY-20S

Aiming laser

Beam splitter

Beam splitter

Power meter

Polarizer

Half waveplate

Beam dump

AOM

10

Control and DAQ Electronics package• A huge electronics renewal is expected during the V+ shutdown

– Obsolescence– Reduction of the noise

• New DAQ electronics has been developed by LAPP and the deployment of it is partially already started

• It affects the – Suspension control– Injection System control– Interferometer control

• Global control

STAC/Council June 2008 10

11

Virgo site in Cascina

12

The European Gravitational ObservatoryPURPOSE• The Consortium shall have as its purpose the promotion of research

in the field of gravitation in Europe. • In this connection and in particular, the Consortium pursues the

following objectives:– ensures the end of the construction of the antenna VIRGO, its

operation, maintenance and the upgrade of the antenna as well as its exploitation;

– ensures the maintenance of the related infrastructures, including a computer centre and promotes an open co-operation in R&D;

– ensures the maintenance of the site;– carries out any other research in the field of gravitation of common

interest of the Members;– promotes the co-operation in the field of the experimental and

theoretical gravitational waves research in Europe;– promotes contacts among scientists and engineers, the dissemination of

information and the provision of advanced training for young researchers.

13

EGO• 5 year renewal approved this year• Current members: CNRS, INFN participating equally to

budget (ca 10 M€ / year)• Management:

– EGO Council and its President– EGO Director– Board of auditors– Currently 48 staff, EGO Scientific Director, Adminstrative Head

• Scientific and Technical Advisory Committee– Experts of the field or of related questions

• VESF:Virgo-EGO Scientific Forum– Implementation of one of the EGO purposes– Gathers people interested in gravitational waves and their

detection

14

Virgo performance

15

Noise understanding

• Noise sources and coupling are well understood

• Low frequency shows more structures

• Noise reduction in advanced detectors achieved with proper design

• Virgo+ in 2010: fused silica suspensions and higher Finesse– risk reduction for

Advanced detectors

16

Virgo sensitivity progress

VSR1: May 18-Sep 30 2007 4 month continuous data taking simultaneously with LIGO Analysis in progress

17

Good sensitivity

Calibration lines moved

Environmental noise

Stability• Robust interferometer

– 95% Science Mode duty cycle (if no commissioning is made)

– Good sensitivity• Stable horizon:

8-8.5 Mpc (1.4-1.4 Ns-Ns) - averaged

(now 8-9.5 Mpc)

42-44 Mpc (10-10 BH-BH) - averaged – fluctuating with input mirror etalon

effect• Low glitch rate: factor 10 lower than

VSR1: < 0.1 Hz SNR >10• Taking data since July 7th with 80% duty

cycle in science mode and locks lasting days

• Preparing for installation of monolithic suspensions

19

Environmental noises studiesInvestigations to understand the sources and the path to dark fringe

Coupling (paths) to dark fringe

- diffused light from in air optical benches

- diffused light related to Brewster window

- beam jitter on injection bench

Sources of environmental noise:

- air conditioning

- electronic racks

Laser

Brewster window

End benches

External bench

Injection bench

Detectionsuspended bench

Beam jitter

DAQ room

Worked in parallel on:- reduction of coupling- reduction of environmental noise

Elec

racks

20

The global network

22

LV Agreement (I)• “All data analysis activities will be open to all members of

the LSC and Virgo Collaborations, in a spirit of cooperation, open access, full disclosure and full transparency with the goal of best exploiting the full scientific potential of the data.”

• Joint committees set up to coordinate data analysis, review results, run planning, and computing. The makeup of these committees decided by mutual agreement between the projects.

• Joint publication of observational data whether data from Virgo, or LIGO (GEO) or both

24

External collaborations• Purpose: best possible scientific output from GW observation

– Sharing of LSC and Virgo GW strain data– proprietary information from non-L-V scientists– specialized expertise for a joint project under the aegis of a LSC-Virgo working group.– may lead to a publication with the full LSC+Virgo author list plus the "external" scientist(s)

involved• Part of the approved scientific program of the Collaborations• Transparent and open evaluation process. • Specific, well-defined project (scope, goal, duration, people), in written and in place

befory proprietary data are exchanged• No exclusive agreements.

• Current list (only signed MoUs listed by name)– SWIFT ToO 5, request for pointing– High energy neutrinos: Antarès-IceCube– Wide-Field Optical Follow-Ups: Pi-of-the-Sky, TAROT, QUEST, ROTSE, Skymapper…– EM Followup with satellites: Fermi-LAT, Fermi-GBM, RXTE, SWIFT– Radiotelescopes– Numerical relativity: numerical injection analysis– SuperNova Early Warning System

• Prepare for Open Data policy

25

The Future: The Einstein Telescope (Europe)

ASPERA-SAC, Apr2010 2626

ET Design

ILIAS-next

ET 2nd DS

ET Prep. phase