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The commissioning of Virgo and GEO The link with N5-WG1

The commissioning of Virgo and GEO The link with N5-WG1. G.Losurdo – INFN Florence H.Grote – AEI Hannover on behalf of N5-WG1. GW detection in Europe. Resonant detectors Auriga – I Legnaro (PD) Explorer – I CERN Nautilus – I Frascati (RM). Interferometers GEO600 – D/UK

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The commissioning of Virgo and GEO The link with N5-WG1

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  1. The commissioning of Virgo and GEOThe link with N5-WG1 G.Losurdo – INFN Florence H.Grote – AEI Hannover on behalf of N5-WG1

  2. GW detection in Europe Resonant detectors Auriga – I Legnaro (PD) Explorer – I CERN Nautilus – I Frascati (RM) Interferometers GEO600 – D/UK Hannover Virgo – F/I/NL Cascina (PI), EGO ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze2/19

  3. Run Commissioning LSC-Virgo MoU for data exchange and joint analysis Detector plans S5 Commissioning 2006 2007 ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze3/19

  4. GEO600 in LSC-S5 • Instrumental duty cycle: 94.3 % • Science time duty cycle: 91.0 % • Longest lock: 102 hrs • Good stationarity Inst. duty cycle [%] May 1 - Oct 15: 168 days days Histogram of sensitivities (BLRMS 555-565Hz) May-September ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze4/19

  5. 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, 2007G.Losurdo – INFN Firenze5/19

  6. 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, 2007G.Losurdo – INFN Firenze6/19

  7. Detector progress GAUSSIANITY WSR 5 – Nov 06 WSR 7 – Jan 07 Main actions • Reduction of longitudinal control noise • Reduction of scattered light effects • Improvements of the interferometer controls WSR 1 – Sep 06 WSR 8 – Feb 07 SENSITIVITY interferometer power 55.5 hrs lock STABILITY ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze7/19

  8. WSRn: towards S5 Commissioning going on Planned start of the long science run: May 18th ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze8/19

  9. 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, 2007G.Losurdo – INFN Firenze9/19

  10. The role of N5-WG1

  11. 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, 2007G.Losurdo – INFN Firenze11/19

  12. N5-WG1 – the group GEO600 A.Freise S.Hild H.Grote (co-chair) G.Degaillaix H.Lueck J.Smith Virgo M.Barsuglia H. Heitmann P.La Penna G.Losurdo (co-chair) E.Tournefier Bar detectors L.Taffarello M.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, 2007G.Losurdo – INFN Firenze12/19

  13. N5-WG1 - Meetings held so far PARALLEL PROJECTS environmental noise studies 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 WG1 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 2006 10th meeting, Cascina, Nov 13-14 2006 11th meeting, Hannover, Jan 23-24, 2007 12th meeting, CERN, Mar 29-30, 2007 The beam centering project 1st report, Napoli-Cascina, June 10-14, 2005 interferometer controls 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 sensitivity studies ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze13/19

  14. 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, 2007G.Losurdo – INFN Firenze14/19

  15. The joint noise hunting project A 9 months post-doc fellowship granted. J.Smith (GEO) spent 25% of time at Virgo site • 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 • 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, 2007G.Losurdo – INFN Firenze15/19

  16. Virgo sensitivity Alignment noise contributions 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 ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze16/19

  17. The joint noise hunting project GEO glitch monitor available at Virgo. Precious “commissioning oriented” tool for understanding detector noise 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) • data quality • detector noise characterization • vetoing J. Smith - G. Vajente HACR at Virgo ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze17/19

  18. 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, 2007G.Losurdo – INFN Firenze18/19

  19. Conclusion 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 The networking activity N5-WG1 is having a real impact on the commissioning of Virgo and GEO600 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, 2007G.Losurdo – INFN Firenze19/19

  20. Spare slides

  21. MILESTONES DELIVERABLES Working group set-up GEO/Virgo noise sources comparison YEAR 1 04-05 Annual report Annual report Recommandations report for short term improvements GEO/Virgo joint noise characterization Development of common characterization algorithms YEAR 2 05-06 GEO/Virgo joint noise characterization Implementation of common characterization algorithms YEAR 3 06-07 Annual report Annual report Recommandations report for short term improvements YEAR 4 07-08 GEO/Virgo joint noise characterization WG1: 4-years execution plan ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze21/19

  22. Galvo off Galvo on 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 R.De Rosa, L. Di Fiore, H.Grote, H.Heitmann, J.Marque, ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze22/19

  23. The alignment optimization project A.Freise, M.Mantovani • 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. ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze23/19

  24. LIGO Challenging… but feasible Long commissioning needed Commissioning started in 1999. Design sensitivity achieved. Detector technology demonstrated ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze24/19

  25. Virgo, GEO, LIGOs ILIAS Annual Meeting - Chambery, Feb. 27th, 2007G.Losurdo – INFN Firenze25/19

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