The commissioning of Virgo and
GEO
The link with N5-WG1
G.Losurdo – INFN Florence
H.Grote – AEI Hannover
on behalf of N5-WG1
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 2/19
GW detection in Europe
Interferometers
GEO600 – D/UKHannover
Virgo – F/I/NLCascina (PI), EGO
Resonant detectors
Auriga – ILegnaro (PD)
Explorer – ICERN
Nautilus – IFrascati (RM)
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 3/19
Detector plans
2006 2007
LSC-Virgo MoUfor data exchangeand joint analysis
RunCommissioning
S5 Commissioning
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 4/19
GEO600 in LSC-S5
Instrumental duty cycle: 94.3 % Science time duty cycle: 91.0 % Longest lock: 102 hrs Good stationarity
Inst
. du
ty c
ycle
[%
]
May 1 - Oct 15: 168 days
days
Histogram of sensitivities (BLRMS 555-565Hz) May-September
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 5/19
After S5
Continue commissioning (at least until spring 2007) to:
improve sensitivity allow long term operation understand better the noise sources
GEO runs in overnight/weekend mode since Oct 15
What next?
Re-join S5 until its end or commissioning until end 2007?
Stay on run during 2008
Sequential upgrades starting 2009
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 6/19
Virgo last year
Work on several issues aimed to – improve robustness– improve sensitivity– understand fully the noise
Weekly Science Runs (WSR): detector taking data during some weekends. Nine WSRs held so far
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 7/19
Detector progress
Main actions Reduction of longitudinal control
noise Reduction of scattered light
effects Improvements of the
interferometer controls
WSR 1 – Sep 06WSR 8 – Feb 07
SENSITIVITY
WSR 5 – Nov 06WSR 7 – Jan 07
GAUSSIANITY
STABILITY
55.5 hrs lock
interferometer power
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 8/19
WSRn: towards S5
WSR # date duty cycle (% locked)
1 Sep 8-11, 2006 90
2 Sep 22-25, 2006 65
3 Oct 6-9, 2006 cancelled
4 Oct 13-16, 2006 cancelled
5 Nov 10-13, 2006 65
6 Dec 1-4, 2006 80
7 Jan 12-15, 2007 76
8 Feb 9-12, 2007 94
9 Feb 17-19, 2007 100
Commissioning going onPlanned start of the long science run: May 18th
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 9/19
Noise hunting
Noise not completely understod.
Noise hunting going on on both detectors
Collaboration going on in WG1 to face common problems
mark the gap between the understood noise and the measured one
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 11/19
N5-WG1 - the mission
Objectives
– To speed up the commissioning and the characterization of Virgo and GEO by means of a deeper collaboration between the two teams
– To develop common methods of characterization of interferometric GW detectors to be applied to Virgo and GEO
– To suggest short term improvements of the existing interferometric detectors on the base of the commissioning experience
Activity:
– face-to-face meetings: detectors status overview, commissioning issues, “hot topic”
– parallel projects: joint work on specific commissioning topics performed by smaller groups
– visits to labs and detector sites, control room sessions
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 12/19
N5-WG1 – the group
GEO600
A.FreiseS.HildH.Grote (co-chair)G.DegaillaixH.LueckJ.Smith
Virgo
M.BarsugliaH. HeitmannP.La PennaG.Losurdo (co-chair) E.Tournefier
Bar detectors
L.TaffarelloM.Visco
Many others attending and giving talks…
P.Ajith, L.Barsotti, V.Dattilo, M.Evans, I.Fiori, R.Gouaty, R.Flaminio, V.Iafolla, M.Mantovani, J.Marque, G.Mayer, G.Vajente, B.Willke, J.P.Zendri,…
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 13/19
N5-WG1 - Meetings held so farWG1 meetings
1st meeting, Cascina, Jul 7-8 2004 2nd meeting, Hannover, Sep 23-24 2004 3rd meeting, Cascina, Jan 24-26 2005 4th meeting, Hannover, April 7-8 2005 5th meeting, Telecon, Jul 14 2005 6th meeting, Perugia, Sep19-20 2005 7th meeting, Hannover, Dec 12 2005 8th meeting, Frascati, Mar 20-21 2006 9th meeting, Potsdam, Jul 21-22 200610th meeting, Cascina, Nov 13-14 200611th meeting, Hannover, Jan 23-24, 2007
12th meeting, CERN, Mar 29-30, 2007
The windmills project
1st telecon, May 12, 2005Team meeting, Cascina, 7-9 June 2005Seismic survey, GEO600 site, July 25-29 2005 2nd telecon, August 25, 2005
The beam centering project
1st report, Napoli-Cascina, June 10-14, 2005
The alignment simulation project
1st meeting, Birmingham, August 2006
The joint noise hunting project
1st report, Cascina, September 11-22 20062nd report, Cascina, October 16-20 20063rd report, Cascina, November 13-17 20064th report, Cascina, January 14-19 2007
5th report, Cascina, March 2007
PARALLEL PROJECTS
envi
ronm
enta
l
noise
stud
ies
inte
rfero
met
er
cont
rols
sens
itivity
stud
ies
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 14/19
Common problems: stray light
Stray light (or scattered light) is an important noise source for all of the interferometric detectors, and is hard to foresee and modelize
Extremely small amounts of light power can cause significant problems
Diagnostics:– Search of spurious beams– Acoustic noise injections– Tapping/hammering tests
Noise reduction techniques:– New optical layouts for auxiliary beams– Larger/higher quality optics– AR-coated windows on photodiodes– Beam dumps
Typical topic for WG1
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 15/19
The joint noise hunting project
Common noise investigations
– Virgo alignment noise projections– Virgo laser power noise investigations – GEO noise transfer functions simulation– General noise hunting at both sites– Knowledge exchange
A 9 months post-doc fellowship granted.
J.Smith (GEO) spent 25% of time at Virgo site
Common algos/Software exchange
– GEO algo for glitch parameterization implemented at Virgo
– GEO data viewer used at Virgo to listen to “dark fringe music” and for off-line analysis of data
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 16/19
The joint noise hunting project
How much is the alignment noise coupled with the GW channel?
Answer the questions by measuring noise projections
Method frequently discussed in WG1, now widely used on both detectors
J. Smith - G. Vajente
Virgo sensitivity
Alignment noisecontributions
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 17/19
The joint noise hunting project
GEO glitch monitor available at Virgo. Precious “commissioning oriented” tool for understanding detector noise
― data quality
― detector noise characterization
― vetoing
Every point is a glitch: an excess of power for some short period of time (tens of ms) and a narrow frequency band (tens of Hz)
HACR at VirgoJ. Smith - G. Vajente
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 18/19
The Windmills project
Costruction of two windmills stations near Virgo proposed. Concern for seismic disturbance
The wind park next to GEO600: chance to study the windmills seismic wave field in a soft soil similar to the Virgo one. – Seismic survey on GEO600 site using two stations run in
coincidence– A model of noise spectral composition and soil attenuation was
done and used to predict effects of the wind parks at Virgo. A safety distance of 5km from Virgo buildings was defined.
Positive reaction of both windmill companies, which modified projects layout to comply with our request.
Joint VIRGO-GEO600 document: VIR-NOT-PIS-1390-317 (I.Fiori
L.Giordano S.Hild G.Losurdo E.Marchetti G.Mayer F.Paoletti)
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 19/19
Conclusion
The networking activity N5-WG1 is having a real impact on the commissioning of Virgo and GEO600
WG1: intense activity linked to the commissioning of Virgo and GEO– Frequent face-to-face meetings– Parallel projects on defined topics– Joint noise hunting effort
Today: a real collaboration among a group of young physicists has been established
Tomorrow: the grown-up WG1 fellows may continue to collaborate and lead the effort for a new EUROPEAN detector
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 21/19
WG1: 4-years execution plan
Annual report
Recommandations report for short term improvements
GEO/Virgo joint noise characterization
YEAR 407-08
Annual report
GEO/Virgo joint noise characterization
Implementation of common characterization algorithms
YEAR 306-07
Annual report
Recommandations report for short term improvements
GEO/Virgo joint noise characterization
Development of common characterization algorithms
YEAR 205-06
Annual reportWorking group set-up
GEO/Virgo noise sources comparison
YEAR 104-05
DELIVERABLESMILESTONES
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 22/19
The beam centering project
Centering of beam used for wavefront sensing on the quadrants is essential for the robustness of the alignment system
Virgo quadrants are centered with a low bandwidth (<0.3 Hz) control– Not enough to reduce rms considerably– Noisy system
GEO uses a commercial galvanometer scanner with custom mechanics and electronics.
Succesfully tested on Virgo: very good suppression of beam fluctuations
Galvo offGalvo on
R.De Rosa, L. Di Fiore, H.Grote, H.Heitmann, J.Marque,
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 23/19
The alignment optimization project
Sensing matrix optimization– Use the distribution of the matrix’ row vectors in the system's
parameter space. Compute the separation of the diode signals in the space of the mirror angular movements.
Controllability:– Study of the dependence of the controllability of a simple system (a
FP cavity using the Ward and the Anderson technique) on the parameters of the optical readout in order to validate and check the performance the chosen test method
Alignment noise propagation in Virgo under study
VIRGO configuration: Result of the study on the controllability on a complex configuration as the VIRGO alignment system. The minimum separation between the 'best' sub-set of signal vectors is shown as a function of Gouy and demodulation phase (for the NE diodes). The chosen alignment control system can thus control all the required degrees of freedom and it can improved by tuning the parameters of the optical readouts.
A.Freise, M.Mantovani
ILIAS Annual Meeting - Chambery, Feb. 27th, 2007 G.Losurdo – INFN Firenze 24/19
LIGO
Commissioning started in 1999.Design sensitivity achieved.
Detector technology demonstrated
Commissioning started in 1999.Design sensitivity achieved.
Detector technology demonstrated
Long commissionin
g needed
Challenging… but feasible