January 12, 2006ILIAS-WG3 Frascati1 Virgo+ & Advanced Virgo B. Mours With material from G. Losurdo,...

January 12, 2006 ILIAS-WG3 Frascati 1

Virgo+

&

Advanced Virgo

B. Mours

With material from G. Losurdo, M. Punturo, A. Viceré and others


Virgo+

Virgo+ concept: Medium scale improvements compatibles with the main Virgo subsystems

» “Plug and play”

» Same optical layout

» Could be incremental

Limited shutdown Limited commissioning time

Four packages have been identified:

1. Monolithic payloads with fused silica suspensions

2. “New” laser with limited power increase (20W → 50W)

3. Mirror thermal compensation

4. Electronics and control system upgrades

Installation target: beginning of 2008


Virgo+ Sensitivity

(b)bulk= 10-9 [Penn et al. 2005](a)bulk= 10-7 [Virgo design model]

Depending onthermal noise model

Newtonian noise


New loss angle evaluation

LIGO

Virgo

813.012942

1

1 1063.41012.71

,3

fV

SC

Hz

fC

S

VC

V

Sf elasticth

C

elasticthsurfbulk

Region of interest forthermal noise in adv Virgo/LIGO

910bulk


Virgo+ Astrophysical impact

Virgo Virgo (50W) Virgo+ (a) Virgo+ (b)

NSNS 12 (31) 15 (37) 46 (114) 22 (56)

BHBH 58 (145) 69 (172) 234 (584) 116 (291)

Inspiral Range (Mpc): averaged (optimal orientation )


Virgo+ planning

Need to reach the Virgo design sensitivity first 2007: We expect to spend more than 50% of time taking data Shutdown for Virgo+ installation

Start: from fall 2007 to the beginning of 2008. End (back to vacuum) : about 6 months later. This installation time could be reduced if new clean rooms are installed.

The installation will be followed by recommissioning Back to science mode operation around the end of 2008.

WP package planning remarks (From November EGO council mtg): Laser:

» Need to order some components ASAP (Fiber laser and laser amplifier) Monolithic suspension:

» R&D already going on but the engineering part is probably the longest activity for Virgo+.

» The mirror production is a long operation: Need to order the “blanks” ASAP Electronic upgrade

» R&D already going on. Thermal compensation system

» Not on the critical path.


Virgo+ Budget

Remarks: For laser and monolithic suspension: summary of WP numbers (recent numbers) For the electronic and thermal compensation: rough estimate. Some items are part of the regular EGO budget as Virgo maintenance cost. The cost of the needed infrastructure (new clean rooms) is not included The 2007 budget may need some adjustments when details will be known. Seems to fit in the EGO Budget if Virgo+ is a priority

NOVEMBER

2005 Estimate


Advanced Virgo


Advanced Virgo

Target sensitivity improvement: One order of magnitude compared to initial Virgo

Time scale: Shutdown around 2011 To be compatible with Advanced LIGO

Bigger changes compared to Virgo+: New beam topology:

» Flat beam? Change the beam waist? Signal recycling??

Progress on internal thermal noise: » Material? Coating? Monolithic suspension?

Newtonian noise subtraction? …

But Smaller Changes than Advanced LIGO keep the seismic isolation.


Advanced Virgo Sensitivity?

Not yet defined! Task of the working group

Target: Virgo/10

Some possibilities:


Advanced Virgo Organisation

4 Working groups set up (coordinators appointed) Low thermal noise suspensions and optics (M.Punturo, G.Losurdo) High power laser and input optics (N.Man, P.La Penna) Optical configuration (A.Freise, P.Hello)

» (Including thermal compensation, flat beams, locking issues and signal recycling)

Electronics and controls. (A.Masserot, A.Gennai)

Goal of the working groups: Define the base line for Advanced Virgo

» To be included in the Advanced Virgo white paper?

Define the work packages Estimate the cost and planning

» The budget request to be issued end of 2007 (?)

GEO-Virgo MOU: To be signed soon?

January 12, 2006ILIAS-WG3 Frascati1 Virgo+ & Advanced Virgo B. Mours With material from G. Losurdo,...

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