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Status of Virgo a short update

Status of Virgo a short update. Michele Punturo. A bit of History. July 29 – August 13 2005 C6 run Duty cycle: Locking 89%, Science Mode 86% September 14-19 2005 C7 run Duty cycle: Locking 70%, Science Mode 65% 19 September 2005

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Status of Virgo a short update

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  1. Status of Virgoa short update Michele Punturo

  2. A bit of History • July 29 – August 13 2005 • C6 run • Duty cycle: Locking 89%, Science Mode 86% • September 14-19 2005 • C7 run • Duty cycle: Locking 70%, Science Mode 65% • 19 September 2005 • Shutdown of the interferometer and start of the ISYS upgrade

  3. Upgrade motivations 1/2 • Large frequency noise in the ITF • When the power recycling mirror is aligned large fringes are seen • Cavity effect between the IMC and the PR • Due to the large amount of light scattered in the IMC • The insertion of a Faraday Isolator at the IMC output was needed to interrupt the light path from the ITF to the IMC • Locking was impossible in this condition • Temporary solution adopted decreasing by a factor 10 the light injected in the IT • Increase of shot noise • Increase of electronic noise

  4. Upgrade motivations 2/2 • Structures at ~40, ~54, ~80 and 150 Hz • More evident when the sensitivity improves • Many of them were due to the modes of the IB • Visible on the spectrum because of a mismatch between fmod and IMC length • Excited by the control noise C6 C7 (beginning)

  5. LB B8 WB Upgrades Q8 1 IMC Laser Q8 2 WE B2 L=3km Q2 1 NB WI PR BS L=5.6m L=3km B7 Q2 2 L=6m L=6.4m B2 NI NE IMC_D1T Q8 2 RFC_DT OB Q8 1 IB RFC OMC Q1 2 B1p EB B1s Q1 1 B1p B5

  6. New IB

  7. New PR PR transfer function • Internal modes of the composite PR were affecting the locking of the ITF • Standard Virgo size PR mirror installed

  8. Others upgrade • Other changes: • New Brewster window (IT/PR link) • New auto alignment system for the Input Mode Cleaner • Laser lab work • Update the layout of the benches • New injection tower flange • Cabling and electronic rack displacement • Laser electronic upgrade • Environmental Monitoring • Linear alignment hardware upgrade • New and low noise RF generator • DAQ upgrade • …

  9. Current status • The suspension in tower of the main components has been completed the 18th of November • The ISYS towers have been closed the 19/12/2005 after a long integration activity (alignment, local control reactivation,…) • Vacuum • Failure in a picomotor: tower opened again the 3/01/2006 • Locking of the IMC on 00 mode the 05/01/2006 • 11/01/2006: • Starting of the IMC autoalignment • Still failures in the picomotors • Light start to be injected in the ITF

  10. Noise budget in C7

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