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Experimental tests of SA simulation

Irene Fiori – Simulation Workshop – March 18, 2004. Experimental tests of SA simulation. Siesta simulation. Virgo data. Inertial Damping simulation test with Real Seism (the Sea-storm). Marionetta  Mirror TF ITF Lock from marionette. ACCELEROMETERS. z. z. POSITION SENSORS (LVDTs).

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Experimental tests of SA simulation

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  1. Irene Fiori – Simulation Workshop – March 18, 2004 Experimental tests of SA simulation Siesta simulation Virgo data • Inertial Damping simulation • test with Real Seism (the Sea-storm) • Marionetta  Mirror TF • ITF Lock from marionette

  2. ACCELEROMETERS z z POSITION SENSORS (LVDTs) F0 top view: qy F0 top view: COIL-MAGNET x x Inertial Damping Reduce the SA motion below  2Hz (in particular at resonances …. IP resonance  30mHz, chain resonances  200mHz ) Helps for Lock acquisition (together with mirror Local Controls) F0 Seism Lvdt_x Corr Err (force on F0_x) C + Acc_x (similar on z, qy)

  3. Filters: H L L+H=1 Open loop gain: 5Hz

  4. The code : /*--------------------------------------------------------------------*/ /* NEW Inertial damping GENERIC tower (A.Vicere, I.Fiori, G.Losurdo) */ /*--------------------------------------------------------------------*/ UJclock masterClocks 360000 2 200. 1. UFrIFile input 1 ../mareggiata_guralp/guralpdispl_full_200hz.gwf UFrDump 1 input.frameH UFrUnpack Sisma_mare 0 proc.Guralp_displ input.frameH US6Set Sisma 0 Sisma_mare.out Sisma_mare.out Sisma_mare.out NULL NULL NULL MIsa SuNI 0 Sisma.out "ni_tuned.sad 0 dampTotal damping.out "defaults" USfilterZPK hp1_acc_s0 SuNI.dxyzt.s0 0 1.0 1 0.0001 0.0 2 0.4398 0.000 0.4398 0.000 USfilterZPK …. USadder error_s2 0 2 lvdt_notched_s2.out hp_acc_s2.out 1.0 1.0 ….. US6Set damping 0 viscous_s0.out NULL viscous_s2.out NULL viscous_s4.out NULL

  5. Mirror motion (…only with Simulation!) ID on / off , with nominal seism

  6. SA modes Resonances F0 cross bar Real vs Siesta (not simulated yet) Siesta “nominal” SA tower

  7. Ground Seism in Siesta Nov. 16, 2003 (C1 run) Real Seism (SEA-STORM) y x z

  8. Quiet seism (data) Inertial damping (C1) Simulation fed with REAL SEISM of SEA-STORM on Nov. 16, 2004 (C1) F0 position sensor Sensor electronic noise

  9. Inertial damping (C1) Simulation fed with REAL SEISM of SEA-STORM on Nov. 16, 2004 (C1) F0 accelerometer Real data Siesta m/s^2/sqrt(Hz) F0 cross-bar Accelerometer Noise not Simulated, here

  10. New Inertial Damping for C2 run (from G.Losurdo) ….. • New local controls reading marionette position: a tilted mirror couples a qz resonance to qy (300 mHz). This resonance is not controllable: we do not have qz actuators • A storm during C1 caused an increase of seismic noise @300 mHz of about 100 • Big excitation of the qz resonance (coupled with qy) • Loss of lock • A new mathematical solution (L5 damping) has been found that allows to: • Move the blending down to 70 mHz preserving the phase margin • Rolling off the LVDT as 1/f 3

  11. New Inertial Damping (C2) Siesta prediction F0 accelerometer response , with Nov. 16 SEA-STORM Seism Accelerometer electronics noise

  12. Ground seism C2 C1 New Inertial Damping (C2) “fortunately” a new, even bigger, sea-storm occured during C2 …

  13. Marionetta  Mirror A good simulation of the Marionetta 2 Mirror mechanical TFs is important for implementing simulation of: • mirrors Local Controls (qx andqy ) • ITF Linear Alignement (qx andqy ) • ITF Lock acting from the Marionette (z)

  14. Measured (Luciano) Marionetta  Mirror (z) Siesta, since v3r88 1/ f 4

  15. Marionetta  Mirror (y) Measured Siesta

  16. TM wires: Siesta 400 mm 200 mm Marionetta  Mirror (x) Measured NOW

  17. ITF Lock with Marionetta (I.Fiori, A.Gennai, G.Losurdo) Noise DAC seism F7 coil C  dL B1p_quad B7 B7_DC B1 What is there : What is still missing : • Seismic noise (5.E-8 / f 2) • Inertial Damping (v.C2) • Actuators (F7): • 8.8Hz pole, DAC noise, saturation • Higher modes (now TEM00) • Control mirror Tx, Ty • Noises: shot, thermal, laser • tuning of Mario resonances

  18. Df 45° Compensator G  2E+5 f 4 (f 3) 25 Hz f -2

  19. Linear Locking (from Marionetta) 0.1% “Lock Quality” similar to standard-lock simulation

  20. DAC noise (300nV/sqrt(Hz)) Anti-TRIGGER x Coil F7 (pole @ 8.8 Hz) Err DAC noise (300nV/sqrt(Hz)) x Coil RM (pole @ 480 Hz) TRIGGER Ramp 10s Lock Transition: Mirror  Mario Err_mario Err_lisa RM coils DAC noise turned OFF

  21. Lock Transition: Mirror  Marionetta 10s RAMP 10s RAMP

  22. Sensitivity curve Can improve the compensator (lower unity gain)

  23. Conclusions • SA Siesta simulation being tested against data, with good results • most SA resonant modes reproduced within < few % • tower by tower tuning, in progress. • Implementation/validation of SA control loops, in progress: • SA Inertial Damping • Mirror local angular controls • Mirror Linear Alignement • (Tidal control) • More complex Siesta simulations (ITF locking) • also demonstrate SA simulation works satisfactory • Siesta simulation being used to test/design Virgo controls

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