Status of the Virgo Commissioning G.Losurdo – INFN Firenze/Urbino for the Virgo Collaboration

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 2 Since last meeting…  ‘Jumps’ disappeared  Two runs: –C6 run: 29 Jul-12 Aug –C7 run: Sep  Big improvement in stability and sensitivity

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 3

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 4

C6 and before (June-July 05)

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 6 Actions before C6  IB aligned on the position of May (when no jumps were present). No more changes since then (except ABP offset during C6)  B2_3f phase detuned by 75° from “optimal” phase  Photodiode centering  Jumps disappeared  NE autoalignment using B1p (HH talk)  Alignment drift control  Improvement of SSFS loop  ITF more stable  ‘  technique’ implemented

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 7 Laser Control of the differential mode B5 BS B5_ACp B5_ACq B1_ACp B2_3f_ACp Subtraction of BS control noise by the correction sent to the end mirrors + -  ”  technique”

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 8 Actions during C6 C6 sensitivity has been improved twice:  Spurious beam damped on NE bench  Change of power stabilization setup (use error signal after MC)

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino days Recycling cavity power C6

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 10 C6 vs C5 (PR pwr *BS_AR)/(injected pwr*10) C5 (no drift control) C6 (drift control)

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 11 Duration: 336h Locking: 89.3% Science mode: 86.2% C6 Duty cycle

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 12 C6 lock statistics

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 13 C6 sensitivity

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 14 C6 inspiral range 04/08(15:00 LT): spurious beams damped on NE bench 04/08(15:00 LT): spurious beams damped on NE bench 10/08 (14:00LT): laser beam re-aligned on the IMC 10/08 (14:00LT): laser beam re-aligned on the IMC 11/08 (15:30LT): laser power stabilization reconfigured 11/08 (15:30LT): laser power stabilization reconfigured GPS: ( 297kPc) GPS: ( 300kPc) GPS: ( 297kPc) GPS: ( 300kPc) 04/08(15:00 LT): spurious beams damped on NE bench 04/08(15:00 LT): spurious beams damped on NE bench 10/08 (14:00LT): laser beam re-aligned on the IMC 10/08 (14:00LT): laser beam re-aligned on the IMC 11/08 (15:30LT): laser power stabilization reconfigured 11/08 (15:30LT): laser power stabilization reconfigured GPS: ( 297kPc) GPS: ( 300kPc) GPS: ( 297kPc) GPS: ( 300kPc) 04/08(15:00 LT): spurious beams damped on NE bench 04/08(15:00 LT): spurious beams damped on NE bench 10/08 (14:00LT): laser beam re-aligned on the IMC 10/08 (14:00LT): laser beam re-aligned on the IMC 11/08 (15:30LT): laser power stabilization reconfigured 11/08 (15:30LT): laser power stabilization reconfigured GPS: ( 297kPc) GPS: ( 300kPc) GPS: ( 297kPc) GPS: ( 300kPc) Best range: 0.4 Mpc

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 15 Improvements during C6 Sensitivity from Jul 29 Sensitivity from Aug 12 Suppression of the non stationary bump Power noise reduction Improvement of B1 optical gain (better alignment conditions ?) B1 electronic noise reduced by  2 (all the power sent to only one photodiode) Slight reduction of frequency noise (alignment ?)

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 16 Stray light Stray beams in the NE external bench. 3 dumped, the bump disappeared ! Effect of stray beams dumping on B1_ACp RMS (in the bump region) Coherence of dark fringe and NE bench photodiode: before and after dumping

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 17 Mode Cleaner transmission Power stabilisation loop July 29 : Sensitivity limited by power noise due to beam jitter before the IMC  Improvement of the beam alignment on the IMC  Improvement of the power stabilisation loop (error signal taken after the IMC) End of the run : the coherence between B1 & angular error signals of MC mirror disappears. Jul 29 Vs Aug 12 Power noise

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 18 Noise budget

After C6 (mid Aug-mid Sep 05)

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 20 Actions after C6  10 AA loops closed (HH talk)  Full hierarchical control implemented  New B5 setup (more power on B5, less frequency noise)  Tidal control on BS  Coil driver upgraded to reduce DAC noise  New PR control filter Important achievements: Anderson technique demonstrated SA control design demonstrated ITF left locked during night !

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 21  Frequency noise limits the sensitivity above 1kHz  It is due to B5_d1 shot+electronic noise which is introduced by the SSFS  This noise can be reduced if a bigger fraction of B5 is sent to B5_d1 Sensitivity Aug 12th B1 shot noise B1 elec noise Frequency noise Incoherent sum Frequency noise

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 22 B5 setup modification 50 % 2f 50 % Data in W Pr_B5_DC,AC d1 d2 50 % 90 % quadrants 10 % Data in W Pr_B5_2f 10 % 2f 90 % Data in W Pr_B5_DC,AC d1 d2 90 % 10 % 95 % quadrants 5 % Data in W Pr_B5_2f Old setup New setup  Now B5_d2 is used for SSFS, with 3 times more power (80% instead of 25%)  Expected reduction of the frequency noise by a factor 2

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 23 B5 electronic and shot noise converted into a laser frequency noise by the SSFS loop  New optical setup : the SSFS error signal receives 3 times more power  Laser frequency noise should be decreased by 2 wrt C6 - B1_ACp, end of C6 - B1_ACp, Aug 23 (new setup) - Shot + electronic noise - Electronic noise Edwige Tournefier Aug 27  Laser frequency noise has been reduced but coherence with B1 still visible Laser 0 B5_ACp Laser frequency control loop (SSFS) B5: results

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 24 DAC noise  “Simple” DAC noise estimation does not explain the noise ( Hz) in the 27 Aug sensitivity  DAC noise larger when correction applied R.Gouaty

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 25 Hierarchical control

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 26 zCorr reduction  Marionette/RM Hz  After reallocation zCorr rms reduced by  100 Without marionette 700 nm rms With marionette 7 nm rms

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 27 Automation 5 mins Lock to DF variable finesse AA ON OMC lock Marionette Low noise CD  technique Lines ON

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 28 M9 – Aug 25 Marionette + NE/WE coil driver upgrade New PR filter New B5 setup Turbo pump DET switched OFF

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 29 BS DAC noise  BS DAC noise limits the sensitivity  Reduction of coil driver gain requires tidal control  Tidal control required!

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 30 M9 inspiral range MPc Best range: 0.6 Mpc

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 31 Reliability  ITF stayed locked for 28 hrs with 10 dof AA ON, full hierarchical control, tidal control on BS

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 32 After M9 BS coil driver upgrade Low gain LC Aug 27

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino Aug inspiral range Best range: 0.85 Mpc Mpc

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 34 Non stationarity  Probably due to diffused light on the end benches

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 35 Sensitivity from Aug 12 (End of C6) Sensitivity from Aug 27 Improvement due to Linear Alignment (4 loops closed instead of 2) DAC noise reduction PR z control noise reduction (Neo filter with 100 Hz) BS z control noise : alpha tuning New optical setup for B5  Reduction of laser frequency noise 2kHz bump due to detection tower pump (exciting external bench resonances) August summary

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 36 Modulation depth  Modulation depth has been increased by a factor 2 (now m = 0.3)  PRCL control noise reduction expected  Tuning of the locking parameters needed

C7 run September

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 38 C7 run  Many new features: –AA –Hierarchical control –Tidal control on BS –Coil driver upgraded –New B5 setup –Modulation depth increased  We decided to make a short run (5 days) before shutdown

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 39 C7 vs C6 sensitivity

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 40 C7 inspiral range Best range: 1.65 Mpc

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 41 C7 duty cycle Locked: 70% Science mode: 64%

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 42 C7 lock statistics

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 43 Hardware injections

ILIAS WG1 – Perugia, September 19, 2005 G.Losurdo – INFN Firenze-Urbino 44 Progress summary