towards advanced virgo
DESCRIPTION
Towards Advanced Virgo. Giovanni Losurdo – INFN Firenze Advanced Virgo Coordinator on behalf of the Virgo Collaboration. Time scale for the upgrades. Advanced LIGO commissioning expected to end: 2013 [LIGO pres. at PAC G050255-01-R]. - PowerPoint PPT PresentationTRANSCRIPT
advanced
Towards Advanced Virgo
Giovanni Losurdo – INFN FirenzeAdvanced Virgo Coordinator
on behalf of the
Virgo Collaboration
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 2
advanced Time scale for the upgrades
Advanced LIGO commissioning expected to end: 2013 [LIGO
pres. at PAC G050255-01-R].
We need an advanced detector on the same timescale to remain in the network: Advanced Virgo
Virgo already has an “advanced” isolation system: we have the opportunity to improve significantly the sensitivity on a shorter timescale: Virgo+
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 3
advanced
Sensitivity curve (models for fundamental noises, technical noises)
Astrophysical figures of merit
Possible improvements of the detector
Short term upgrades: Virgo+
Advanced Virgo
Advanced Virgo White Paper
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 4
advanced Virgo+
Virgo could be upgraded with a set of medium scale, incremental improvements with:
– Compatibility with the main Virgo subsystems (“plug and play”), same optical layout
– Limited shutdown– Limited commissioning time
Four packages have been proposed and funded:1. New laser, with limited power increase (2050 W)2. Mirror thermal compensation3. Electronics and control system upgrades4. Monolithic payloads with fused silica suspensions
Installation foreseen in 2008
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 5
advanced Virgo+ sensitivity
Inspiral range
Virgo Virgo+ (a) Virgo+ (b) Virgo+ (c)
NSNS 12.5 (31) 61 (153) 62 (155) 28 (70)
BHBH 58 (145) 313 (784) 318 (795) 142 (355)
1 10 100 1000 1000010-23
10-22
10-21
10-20
10-19
10-18
h(f) [1
/sqrt(H
z)]
Frequency [Hz]
50W/2 + new losses model 50W/2 + new losses model + F=150 50W/2 + current mirrors Nominal Virgo 50W/2 + new losses mod+FS suspensions+F=150 Virgo+ with Newtonian Noise
NN
(b)(a)
(c)
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 6
advancedSteps towards Advanced Virgo
Four working groups have been set up at the end of 2005 to carry on the studies for Advanced Virgo:
– WG1: interferometer optical configuration, sensing and control (chairs: A.Freise, P.Hello)
– WG2: laser and optics for high power (chairs: P.La Penna, N.Man)
– WG3: suspensions and thermal noise issues (chairs: M.Punturo, P.Puppo)
– WG4: electronics and controls (chairs: A.Gennai, N.Leroy)
WG3 and WG4 are responsible also of the development of electronics and monolithic suspensions for Virgo+
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 7
advancedSteps towards Advanced Virgo
An Advanced Virgo coordinator has been appointed with the mandate of:– Coordinating the WGs activities– Coordinating the writing up of an Advanced Virgo Design by
November 2007
Document contents: – Detector design (options and path towards selection)– Sensitivity curve– General planning and cost evaluation
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 8
advanced Guidelines for R&D
GOAL: define the prioritary R&D lines for an Advanced Virgo in
2011
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 9
advanced R&D: priority list
Definition of the optical configuration, locking and alignment scheme, detection scheme
High power laser
Input optics compliant with high power
Output optics and photodiodes compliant with high power and with the chosen detection scheme
Monolithic suspensions
Mirrors and coatings
Vibration isolation and suspension control
Advanced Virgo (2011) is not expected to use:
– Cryogenics– Squeezing– Non gaussian beams
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 10
advanced EGO 2nd call for R&Ds
2nd EGO call for R&D
20 Letter of Intents received, reviewed by STAC
LoIs to be turned into proposals by Nov 9th
Meeting for proposal presentation to the Collaboration (Nov 7th)
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 11
advanced Design options
Optical configuration– Change beam waist position– Use signal recycling– Use DC detection– Thermal compensation scheme
High power laser– Solid state or fibre laser
Input optics– EOM and Faraday compliant with high power– New telescopes for the new optical configuration– New input mode cleaner. Fibre mode cleaner
Output optics and photodiodes– New photodiodes for higher power– New OMC
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 12
advanced Design options
Monolithic suspensions (already studied for Virgo+)– Make it compliant with heavier mirrors– Use ribbons– New engineering of ears, fibers, bonding
Test masses– New mirrors geometry– New coatings– New procedures for cleanliness
Vibration isolation and suspensions control– 6 d.o.f. control of the superattenuator top stage (tackling tilt
effect)– Electrostatic actuators
We expect to select most of the listed options in the Advanced Virgo Design document
ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 13
advanced Summary
The upgrade to Virgo+ has been funded, installation foreseen in 2008
The Virgo Collaboration has started the design effort for a second generation detector in 2011
Advanced Virgo Design due by November 2007
Advanced Virgo web page
Online soon…
A possible joint run planning