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20 April 2005D. Verkindt, LAPP, Virgo1 VIRGO experiment Gravitational waves detector D. Verkindt.

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Presentation on theme: "20 April 2005D. Verkindt, LAPP, Virgo1 VIRGO experiment Gravitational waves detector D. Verkindt."— Presentation transcript:

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2 20 April 2005D. Verkindt, LAPP, Virgo1 VIRGO experiment Gravitational waves detector D. Verkindt

3 20 April 2005D. Verkindt, LAPP, Virgo2 First detection of gravitation

4 20 April 2005D. Verkindt, LAPP, Virgo3 Gravitational Waves

5 20 April 2005D. Verkindt, LAPP, Virgo4 First words about gravitational waves A. Einstein, Preussiche Akademie der Wissenschaften, Sitzungsberichte, p. 688 (1916) A. Einstein, Preussiche Akademie der Wissenschaften, Sitzungsberichte, p (1918) 25 Novembre 1915

6 20 April 2005D. Verkindt, LAPP, Virgo5 An accelerated electric charge produce an electromagnetic wave How is created a gravitational wave? An asymmetrically accelerated mass produce a gravitational wave e-e- E

7 20 April 2005D. Verkindt, LAPP, Virgo6 A gravitational wave affects space-time. It modifies the measure of distances. The visible effects of a gravitational wave h =  L / L L+  L L

8 20 April 2005D. Verkindt, LAPP, Virgo7 Undetectable source of GW : you! h = at 1 meter

9 20 April 2005D. Verkindt, LAPP, Virgo8 Strong sources: stars! Black holes h = at 0.02 Mpc Formation d’un trou noir Supernovae h = at 1 Mpc

10 20 April 2005D. Verkindt, LAPP, Virgo9 Un signal bien connu théoriquement Confirmed source: binary coalescence h(t) f(t) Hz sec h = at 1 Mpc

11 20 April 2005D. Verkindt, LAPP, Virgo10 Binary pulsar Discovered in 1974 by Hulse and Taylor with Arecibo radio-telescope - Orbital period : 7.7 hours - Distance: ly - Coalescence in 300 million years Hulse Taylor R.A. Hulse et J.H.Taylor, The Astrophysical Journal, 195, 1975, L51 J.H.Taylor and J.M. Weisberg, « Further experimental tests of relativistic gravity using the binay pulsar », Astrophysical Journal 345, (1989)

12 20 April 2005D. Verkindt, LAPP, Virgo11 Challenge of gravitational waves detection meters h =  L / L =

13 20 April 2005D. Verkindt, LAPP, Virgo12 Interferometric detection Incident Laser beam Interference fringes

14 20 April 2005D. Verkindt, LAPP, Virgo13 Dark fringe Interferometric detection Incident Laser beam

15 20 April 2005D. Verkindt, LAPP, Virgo14 Out of dark fringe LL LL Interferometric detection Incident Laser beam

16 20 April 2005D. Verkindt, LAPP, Virgo15  L = h L < km Gravitational Wave Source: K. Thorne (Ligo) < m Interferometric detection of a gravitational wave

17 20 April 2005D. Verkindt, LAPP, Virgo16 VIRGO experiment

18 20 April 2005D. Verkindt, LAPP, Virgo17 VIRGO experiment From NASA world wind software (http://worldwind.arc.nasa.gov)

19 20 April 2005D. Verkindt, LAPP, Virgo18 3 km arms VIRGO experiment

20 20 April 2005D. Verkindt, LAPP, Virgo19 West North VIRGO experiment

21 20 April 2005D. Verkindt, LAPP, Virgo20 Vacuum tanks VIRGO experiment

22 20 April 2005D. Verkindt, LAPP, Virgo21 Anti-seismic towers VIRGO experiment

23 20 April 2005D. Verkindt, LAPP, Virgo22 Mirrors VIRGO experiment

24 20 April 2005D. Verkindt, LAPP, Virgo23 Suspended detection bench VIRGO experiment

25 20 April 2005D. Verkindt, LAPP, Virgo24 Detection photodiodes VIRGO experiment

26 20 April 2005D. Verkindt, LAPP, Virgo25 photodiode laser Nature is noisy! VIRGO experiment laser noise seismic motion actuators noise phase noise pendulum thermal noise wires thermal noise shot noise

27 20 April 2005D. Verkindt, LAPP, Virgo26 Sensibilité du détecteur VIRGO experiment

28 20 April 2005D. Verkindt, LAPP, Virgo27  septembre 2001  décembre 2001  avril 2002  mai 2002  juillet 2002 First sensitivity of VIRGO interferometer

29 20 April 2005D. Verkindt, LAPP, Virgo28 run E0 (september 2001)run E4 (july 2002) E 0 VIRGO experiment

30 20 April 2005D. Verkindt, LAPP, Virgo29 VIRGO experiment Control loops From R. Flaminio

31 20 April 2005D. Verkindt, LAPP, Virgo30 VIRGO experiment Locking scheme of recombined interferometer Common Mode control loop (low frequency) Laser 0 B2 B1_ACp + - Differential Mode control loop BS B2 phase Reference cavity + + B2 quad LWLW LNLN BS angular control (Sc_BS_txCmir) from R. Gouaty

32 20 April 2005D. Verkindt, LAPP, Virgo31 VIRGO experiment Laser 0 B2_3f ACp B1 ACp + - Differential mode B5 PR Laser frequency control loop (SSFS) B5_ACp B5_ACq BS Locking scheme of recycled interferometer  B1_ACp used to control the Differential Mode  B5_ACq used to control the Beam Splitter (Michelson mode)  B2_3f_ACp used to control the Recycling cavity length (PR)  B5_ACp used to control laser frequency (Common Mode) from R. Gouaty

33 20 April 2005D. Verkindt, LAPP, Virgo32 VIRGO experiment from R. Gouaty

34 20 April 2005D. Verkindt, LAPP, Virgo33  C1: Sept 2003  C4: juil 2004  C5: dec 2005 Current sensitivity of VIRGO interferometer

35 20 April 2005D. Verkindt, LAPP, Virgo34 VIRGO experiment

36 20 April 2005D. Verkindt, LAPP, Virgo35 Other GW interferometric detectors

37 20 April 2005D. Verkindt, LAPP, Virgo36 4 km 600 m3 km 300 m

38 20 April 2005D. Verkindt, LAPP, Virgo37 LIGO experiment LIGO Hanford Observatory (LHO) H1 : 4 km arms H2 : 2 km arms LIGO Livingston Observatory (LLO) L1 : 4 km arms 10 ms

39 20 April 2005D. Verkindt, LAPP, Virgo38 LIGO experiment Livingston Hanford

40 20 April 2005D. Verkindt, LAPP, Virgo39 Current sensitivy of LIGO interferometers

41 20 April 2005D. Verkindt, LAPP, Virgo40 New telescopes: giant interferometers 3 km long… listening to the sky

42 20 April 2005D. Verkindt, LAPP, Virgo41 LISA project Interferometer in space The Future (…2014 ?)

43 20 April 2005D. Verkindt, LAPP, Virgo42 A new way to see the Universe Crabe Nebula

44 20 April 2005D. Verkindt, LAPP, Virgo43 Source: A Weinstein (Ligo) Ondes Gravitationnelles ? A new way to see the Universe

45 20 April 2005D. Verkindt, LAPP, Virgo44 Gravitational waves a new window on the Universe… More informations lapp.in2p3.fr/virgo


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