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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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 4 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 5 of 16
Detection range on NS-NS binaries
GRB050509B
AD LIGO/VIRGO
EGO1st
generation
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 6 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 7 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 8 of 16
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/
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 9 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 10 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 11 of 16
Silicon for substrates
Low T facilities for optical and mechanical loss measurements are
being assembled
[111] B doped [100] intrinsic
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 12 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 13 of 16
Materials for Resonators
CuAl
Mo
BeQ up to 1e6@4K
Optical transducerprototype
SiC cantileverblade
5 cm
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 14 of 16
Cryogenics facility at EGO
COLD FINGER
Very
SoftJoints
Cryostat
COLD FINGER
2m
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 15 of 16
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
24th June 2005 AMALDI 6 - Okinawa - G.Cagnoli 16 of 16
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/