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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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a bit of history
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
upgrade motivations 1 2
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
upgrade motivations 2 2
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)

upgrades

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

new pr
New PR

PR transfer function

  • Internal modes of the composite PR were affecting the locking of the ITF
  • Standard Virgo size PR mirror installed
others upgrade
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
current status
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
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