Francesco Fidecaro

STAC meeting, Cascina, May 28, 2009

Virgo status report

2

Detector upgrades and commissioning

Activities were on:• Improvements of electronics, software and detector

operation• Interferometer control and characterization• Injection system • Optical characterization, thermal effect compensation

and their simulation• Noise hunting and environmental noise coupling

reduction

3

4

Monolithic Suspensions

Strategic goal• significant scientific opportunity by increasing the sensitivity at low frequency• unique place to test the monolithic suspension and to explore the level of noise at

low frequency before these detectors are built.• shown that thermal noise of the upper suspension needs now to be considered, in

spite of the double pendulum attenuation.Status and activities• Optimizing the production of suspension fibers and verifying its reliability and

reproducibility• Finalizing the design of the payload• Coating of the new mirrors at LMA• Design of the new marionette• Measurement of mechanical behaviour of a dummy payload• Work on payload assembly and transport trolley• Design and construction of a clean room for Monolithic suspension preparation• Starting production of clamps and reference masses• Work on fibers and clamps has shown the great reliability and simplicity of use of

these suspensions. • first measurements on residual losses are promising.

5

Noise understanding

• Noise budget

6

Noise understanding

• Longitudinal noise

7

Noise understanding

• Alignment noise

8

Sensitivities

9

Trade off

• Alternatives– Virgo+: current situation, laser power increased

– Virgo+-: monolithic suspension installed in April 2010 with a 6 month stop

– Virgo++: monolithic installed in November 2009 for end mirrors in 2 months, then for the two other mirrors in April 2010, again in 2 months

– Virgo++ Super: monolithic suspensions installed in November 2009 with a 4 month commissioning stop

Payload solution Crab (60Hz) BNS range BBH range Burst; 1kHz

Virgo design 7.7 10-23 13 Mpc 63 Mpc 7.5 10-23

V+ Current mirrors, no Eddy Currents

5.6 10-23 15 Mpc 76 Mpc 5.1 10-23

V+ End mirrors w Mon susp 18 Mpc 85 Mpc

V+ Steel Wires; new mirrors 4.6 10-23 21 Mpc 109 Mpc 5.0 10-23

V+ Mon Suspension 1.4 10-23 49 Mpc 250 Mpc 5.0 10-23

10

Integrated volume

NSNS Integrated Volume

0.0E+00

1.0E+05

2.0E+05

3.0E+05

4.0E+05

5.0E+05

6.0E+05

7.0E+05

8.0E+05

Time

Mp

c^

3 y

r Virgo+

Virgo+-

Virgo++

Virgo++ S

BHBH Integrated Volume

0.0E+00

1.0E+07

2.0E+07

3.0E+07

4.0E+07

5.0E+07

6.0E+07

7.0E+07

8.0E+07

9.0E+07

1.0E+08

01/0

7/09

01/1

0/09

01/0

1/10

01/0

4/10

01/0

7/10

01/1

0/10

01/0

1/11

01/0

4/11

01/0

7/11

TimeM

pc

^3

yr Virgo+

Virgo+-

Virgo++

Virgo++ S

NSNS Integrated Volume

1.0E+03

1.0E+04

1.0E+05

1.0E+06

Time

Mp

c^

3 y

r Virgo+

Virgo+-

Virgo++

Virgo++ S

BHBH Integrated Volume

1.0E+05

1.0E+06

1.0E+07

1.0E+08

01/0

7/20

09

01/1

0/20

09

01/0

1/20

10

01/0

4/20

10

01/0

7/20

10

01/1

0/20

10

01/0

1/20

11

01/0

4/20

11

01/0

7/20

11

Time

Mp

c^

3 y

r Virgo+

Virgo+-

Virgo++

Virgo++ S

11

Conversion factor

• Most likely rate:– For NSNS: 10-4 yr-1 per Milky Way Equivalent Galaxy (MWEG)

– For BHBH: 0.6 10-6 yr-1 MWEG-1

• Based on paper by V. Kalogera et al., Astrophysical Journal Letters 614, L137 (2004): analysis of one of the latest binary pulsar system discovered

• Uncertainty extends one order of magnitude below and two above this figure.

• MWEG density: 1.2 10-2 Mpc-3 (R.K. Kopparapu et al., The Astrophysical Journal 675, 1459 (2008), URL http://www.journals.uchicago.edu/doi/abs/10.1086/527348).

• LV has adopted a conversion factor of 5 10-7 yr-1 MWEG-1(NSNS)• BHBH : 0.6 10-8 yr-1 MWEG-1

12

13

14

15

Network integrated volume

NSNS Triples Integrated Volume

0,0E+00

5,0E+05

1,0E+06

1,5E+06

2,0E+06

2,5E+06

3,0E+06

3,5E+06

01/0

7/20

09

01/1

0/20

09

01/0

1/20

10

01/0

4/20

10

01/0

7/20

10

01/1

0/20

10

01/0

1/20

11

01/0

4/20

11

01/0

7/20

11

Time

Mp

c^

3 y

r Virgo 9 May

Virgo CM

Virgo+ MS 1

Virgo+ MS 2

NSNS Doubles Integrated Volume

0,0E+00

1,0E+06

2,0E+06

3,0E+06

4,0E+06

5,0E+06

6,0E+06

01/0

7/20

09

01/1

0/20

09

01/0

1/20

10

01/0

4/20

10

01/0

7/20

10

01/1

0/20

10

01/0

1/20

11

01/0

4/20

11

01/0

7/20

11

TimeM

pc

^3

yr Virgo 9 May

Virgo CM

Virgo+ MS

Virgo+ MS 2

Exp number of events/year

16

Monolithic suspensions

• Monolithic suspensions are a real bonus for the LV network

• Also very interesting in coincidence with astronomical observatories

• Good data for LV analysis: Vela spindown limit can be reached in three months

• At least six months of data are needed to understand the device before shutting down for Advanced Virgo

17

Data analysis

• Last C7 paper published; The Virgo collaboration, “Gravitational wave burst search in Virgo C7 data”, Class. Quant. Grav 26 (2009) 085009

• VSR1/S5 analysis in progress for all four physics groups• VSR2/S6 preparation: low latency triggers, data quality,

interferometer figures of merit• External collaborations: Swift ToO approved,

Antarès/IceCube HE nus: MoU being drafted, Wide Optical Field Telescopes in progress, new proposal on The next galactic Supernova

• Load on computing centers• Data transfer

18

New groups

• Trento-Padova approved as regular Virgo group: data analysis and paper on bursts, will contribute to Advanced Virgo with mechanics and possibly electronics for the suspensions

• POLGRAW (Poland) approved as regular Virgo group, contribute on CW, is applying for resources to build vacuum equipment for Advanced Virgo

• Genoa approved as regular Virgo group, will build LN2 plant for cryotraps

• RMKI (Hungary) is applying for a grant to use their workshops to build vacuum equipment for Advanced Virgo

• Working with LKB

19

LV collaboration

• Regular contacts with LigoDirectorate/LSC Spokesperson, Joint run planning committee, Data Analysis Council, …

• Meetings in March (Arcadia, CA), June (Orsay), Sepember (Budapest)

• Face to face and regular meetings for data analysis and instrument science

• Remote participation now commonly used• Data analysis is now common, instruments keep their

own identity but contacts are frequent

20

Conclusions

• The Virgo collaboration just passed a difficult trial, presenting Advanced Virgo in a convincing way, having adopted a project management methodology

• Issues remain, sometimes not fully addressed because of the little time available, sometimes inherent to the structure of the collaboration

• In the mean time full steam commissioning the interferometer

• And working on present and future data analysis• These efforts will be rewarded!

21

Group V V+ AdV DATOTA

L

Annecy 2,4 9 0,25 3,15 14,8

APC 0,2 0 2,4 1 3,6

Artemis 1,80 1,50 3,20 1,00 7,5

Firenze 1,40 1,90 4,70 1,50 9,5

Genoa 0,30 0,80 2,30 0,00 3,4

LMA/ESPCI 0,20 2,35 3,25 0,00 5,8

Napoli 1,70 0,00 3,50 2,60 7,8

NIKHEF 0,6 1,6 0 1,9 4,1

Orsay 0,25 0,00 1,85 5,90 8

Padova Trento 0,10 0,00 0,25 2,75 3,1

Perugia 0,20 0,50 3,80 1,60 6,1

Pisa 0,50 9,75 4,05 6,20 20,5

POLGRAW 0,20 0,20 0,20 3,60 4,2

RMKI 0,95 0 0,2 1,25 2,4

Roma I 1,10 2,80 3,40 6,10 13,4

Roma II 0,00 1,60 4,80 1,50 7,9

Total 11,9 32 38,15 40,05 122,1

EGO 18,1 6,2 1,9 1,9 28,1

Total 30 38,2 40,05 41,95 150,2

Virgo manpower

22

Virgo manpower

Manpower10%

2%

5%

6%

2%

4%

5%

3%

5%

2%4%

14%

3%

2%

5%

19%

9%

Annecy

APC

Artemis

Firenze

Genoa

LMA/ESPCI

Napoli

NIKHEF

Orsay

Padova Trento

Perugia

Pisa

POLGRAW

RMKI

Roma I

Roma II

EGO