MSC report 14-20 September 25-09-07 weekly meeting EM-MSC-250907.

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Presentation transcript:

MSC report 14-20 September 25-09-07 weekly meeting EM-MSC-250907

VSR1 breaks Mantenance GIPC, SFR implementations e.m. noise investigations Commissioning Beam Centring on BS Etalon EM-MSC-250907

reconstructed by local DSP GIPC (Global IP Control) + SFR (SeismFreeReconstruction) GIPC: zGC is not crucially affected by Seism (its reference is a suspended mirror) SFR: Sseism is coherent in the central area and reconstructed signals are free from it. deduced from GC zCorr reconstructed by local DSP GC done ! Fabry-Perot cavtiy input mirrors as reference EM-MSC-250907

Top-stage control strategies involving suspension operation as-a-whole The strategy. Top-stage control strategies involving suspension operation as-a-whole improve disturbance rejection capability. EQ GUARD used in monitor mode. SFR (Central Area) GIPC (ARMs) higher cross-over f (lower wind noise without seism re-injection) & Coherent response to EQs ENV-TUNED GUARD Next ! EM-MSC-250907

Performance (in quiet environmental conditions) Spectral check as the new scheme was implemented In quiet conditions no change at the mirror level EM-MSC-250907

A lucky occurrence ! Comparison of two events with similar local amplitude. A lucky occurrence ! 40 m peak Previously we got saturation as the amplitude was less than 20 m MARIO: small residual correction (~7 m) The system is much more robust Dynamics more than doubled EM-MSC-250907

Beam vs BS (centring investigations) Motivated by: control noise coupling, actual BS position ..) STD method: tx,ty 10Hz from RM; x,y slow translation from suspension top; BS tracked keeping aligned the ITF. x B5 B1 W Large H translation z (locked) interesting evidence: B5 changes EM-MSC-250907

Tilt transfer function ty => z vs horizontal position x - 3000 m + 3000 m Coupling ty z worse (170%) B5 better 3 % The system was left at + 3000 m according to this procedure the beam is off-centred by 15 mm tx vs z checked also the beam results to be almost centred (1.5 mm) EM-MSC-250907

Etalon Known relationship among PRCL_NEWE subtraction (beta) and Fabry-Perot finesse asymmetry between Virgo arms (Vajente). Known relationship among beta subtraction and NS-NS Horizon (Tournefier). EM-MSC-250907

Etalon Beta vs asymmetry (B8-B7) Known relationship between the temperature in the ovens, finesse asymmetry and Etalon effect (Punturo). 14/09/07 T_NI B7 Beta too large T_WI Thermal drift into the ovens of NI and WI B8 EM-MSC-250907

Etalon Beta vs asymmetry (B8-B7) Known relationship between the temperature in the ovens, finesse asymmetry and Etalon effect (Punturo). 14/09/07 T_NI B7 Beta decreases T_WI Cm control to GxServer to provide a small heating through LC illuminators (few Watts !!!) B8 EM-MSC-250907

Etalon a simple check to verify that we are actually actuating on Etalon Mirror temperature checked through drum mode freq. vs temperature change driven by LC coarse illuminator. T [C] WI NI Beta can be remotely driven (in simple way ?) 21/09/07 17/09/07 1.5 V 1.3 V e.m. noise investigations into the ovens EM-MSC-250907