R&D on thermal noise in Europe: the STREGA Project

Geppo CagnoliUniversity of Glasgow

AMALDI 6 – Okinawa - JapanJune 20-24 2005

24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 2 of 16

Toward the 3rd generation detectors

• The 1st generation is taking data– ~20 Mpc NS-NS detection range

• The Big Leap: Advanced Detectors– Stretching room temperature technology

to its very limit– Impressive R&D for Advanced LIGO– ~350 Mpc NS-NS detection range– Advanced VIRGO proposal on its making– MiniGRAIL, SFERA and DUAL advanced

resonant detectors

24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 3 of 16

Toward the 3rd generation detectors

• We have to secure the detection distance and potentially increase it with a further 10 times reduction of the detector noise

• Technology – Low temperature is a promising

direction for Interferometers– SQL and ultra-cryogenic operation for resonant

detectors

• LCGT (Large Cryogenic Gravitational Telescope) is a precursor

• Complementary to LISA and DECIGO

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EGO: the 3rd generation observatoryhttp://virgo-bwulf.pg.infn.it/~punturo/FP6/

1 10 100 1k 10kFrequency [Hz]

10 -22

10 -23

10 -24

10 -25

10 -19

10 -20

10 -21

h

[ H

z –1

/2 ]

ADVANCED LIGOADVANCED VIRGO

Distance Rate

NS-NS 20Mpc1/3000yr

1/3yr

NS-BH 43Mpc1/2500yr

1/2yr

BH-BH 100Mpc1/600yr

3/yr

NS-NS 350Mpc3/yr

4/day

NS-BH 750Mpc1/yr

6/day

BH-BH Z~0.451/month30/day

EGOINTERFEROMETER

EGO - RESONANT

NS-NS 1Gpc2/month

2/h

NS-BH 2.4Gpc1/month

3/h

BH-BH Z~11/3 day1/5 min

LCGT

1st generation limit

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Detection range on NS-NS binaries

GRB050509B

AD LIGO/VIRGO

EGO1st

generation

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What STREGA is

• Study of Thermal noise Reduction for European Gravitational wAve detectors

• STREGA mission

– Lower thermal noise 10 times with respect to the second generation detectors

• STREGA coordinates the efforts that many labs in different projects spend on Thermal Noise Research

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Institutions and Labs

– CNRS/ln2p3• ESPCI (Paris), LKB (Paris), LMA (Lyon)

– INFN• Firenze/Urbino, Frascati, Genova, Legnaro, Napoli,

Padova, Perugia, Pisa, Roma1, Roma2, Trento

– IFN• Trento

– University of Leiden• MiniGRAIL

– University of Glasgow• IGR

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Some numbers

• ~120 scientists involved• 1390 k€ total budget from EU

• Started 1st April 2004• 5 years duration

http://www.ego-gw.it/ILIAS-GW/

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ILIAS Astro-Particle Physicshttp://ilias.in2p3.fr/

STREGA as part of a bigger Project

STREGA(R&D)

GWA(Networking)

Gravitational Waves

Double decay Dark Matter

Deep U-groundLabs

EUFP6

7.5 M€

FrameworkProgram 6supports thedevelopmentof the EuropeanResearch Area with 17.5 G€

72 G€ in FP7

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C1 - Cryogenictop

suspensionsfor IFOs

C2 - Cryogenicsystem forresonators

C3 - IFOs last stage

suspensions

M1Mirrorsubstrates

M2Materials forresonators

M3 – Super conductiveRF cavities

M4Mirrorcoatings

M5Mirrorsuspensions

M6 Cosmic Raysacoustic em.

T1 - Direct ThNsmeasurement

facility

T2 - Dynamicphoto-elastic

effect

T3 - Selectiveread-out

for resonators

The Content

• 3 Objectives: Materials, Cryogenics, Th. Noise Selected topics

NEW DATANEXT TALK

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Silicon for substrates

Low T facilities for optical and mechanical loss measurements are

being assembled

[111] B doped [100] intrinsic

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Coatings

Advanced LIGO poster

+Investigation on losses

of dielectric coatings forDiffractive Optics

0 10 20 30 40 50 60

1.5

2

2.5

3x 10-4

Relative Concentration

Loss

Ang

le

Small CoaterLarge Coater

Loss Angle of SiO2 /TiO2-doped-Ta2O5 at 100 HzG.Harry - Coating Working Group – Advanced LIGO

Facility forQ measurements

on coatedcantilever blades

at LMA

R.Schnabel andInstitute of Applied Physics, Univ of Jena

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Materials for Resonators

CuAl

Mo

BeQ up to 1e6@4K

Optical transducerprototype

SiC cantileverblade

5 cm

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Cryogenics facility at EGO

COLD FINGER

Very

SoftJoints

Cryostat

COLD FINGER

2m

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Direct Th.Ns. Measurement Facility

New Suprasil3 cavity, 10cm long, for the Perugia facility dedicated to measure thermalnoise around resonances of membranes

GLASGOW FACILITY

Resonant state lasting for several minutes

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Conclusions

• First of the 5 years is already concluded

• The coordination across labs of different projects is working well especially for Coatings, Suspensions and Cryogenics

• STREGA and GWA are open to new groups that want to participate in the project

• Full details in http://www.ego-gw.it/ILIAS-GW/