experimental tests of sa simulation irene fiori – simulation workshop – march 18, 2004 virgo...

Experimental tests of SA simulation

Irene Fiori – Simulation Workshop – March 18, 2004

Virgo data Siesta simulation

1. Inertial Damping simulation test with Real Seism (the Sea-storm)

2. Marionetta Mirror TF

ITF Lock from marionette

Inertial Damping

Seism

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

ACCELEROMETERS

POSITION SENSORS (LVDTs)

COIL-MAGNET

CCorr

Lvdt_x

Acc_x

(similar on z, y)

x

z

F0 top view: y

(force on F0_x)+

x

z

F0 top view:

Err

HL

L+H=1

5Hz

Open loop gain:

Filters: 02

aH l L x L x

s

The code :

MIsa SuNI 0 Sisma.out "ni_tuned.sad 0 dampTotal damping.out "defaults"

UJclock masterClocks 360000 2 200. 1.

UFrIFile input 1 ../mareggiata_guralp/guralpdispl_full_200hz.gwfUFrDump 1 input.frameHUFrUnpack Sisma_mare 0 proc.Guralp_displ input.frameH

US6Set Sisma 0 Sisma_mare.out Sisma_mare.out Sisma_mare.out NULL NULL NULL

/*--------------------------------------------------------------------*//* NEW Inertial damping GENERIC tower (A.Vicere, I.Fiori, G.Losurdo) *//*--------------------------------------------------------------------*/

USfilterZPK hp1_acc_s0 SuNI.dxyzt.s0 0 1.0 10.0001 0.020.4398 0.0000.4398 0.000

USfilterZPK ….

US6Set damping 0 viscous_s0.out NULL viscous_s2.out NULL viscous_s4.out NULL

USadder error_s2 0 2 lvdt_notched_s2.out hp_acc_s2.out 1.0 1.0

…..

Mirror motion

ID on / off , with nominal seism

(…only with Simulation!)

SA modesReal vs Siesta

Resonances F0 cross bar

Siesta “nominal” SA tower

(not simulated yet)

F0 horizontal modes (poles) [ Hz ]BS tower Siesta (% deviation)

0.037 0.038 (+3%)

0.291 0.296 (+2%)

0.55 0.59 (+7%)

0.79 0.77 (-2.5%)

0.99 0.97 (-2%)

1.22 1.25 (+2.5%)

1.57 1.60 (+1.9%)

1.88 1.90 (+1%)

8.5 -

11.0 -

Ground Seism in Siesta

Real Seism (SEA-STORM)

Nov. 16, 2003(C1 run)

y

x

z

Inertial damping (C1)Simulation fed with REAL SEISM of SEA-STORM on Nov. 16, 2004 (C1)

Quiet seism (data)

F0 position sensor

Sensor electronic noise

Inertial damping (C1)

Real data

SiestaF0 cross-bar

Simulation fed with REAL SEISM of SEA-STORM on

Nov. 16, 2004 (C1)F0 accelerometer

m/s

^2

/sq

rt(H

z)

AccelerometerNoise notSimulated, here

• New local controls reading marionette position: a tilted mirror couples a z resonance to y (300 mHz). This resonance is not controllable: we do not have z actuators

• A storm during C1 caused an increase of seismic noise @300 mHz of about 100 Big excitation of the z resonance (coupled with y)

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

New Inertial Damping for C2 run

(from G.Losurdo)

…..

New Inertial Damping (C2) Siesta prediction

F0 accelerometer response , with Nov. 16 SEA-STORM Seism

Accelerometerelectronics noise

New Inertial Damping (C2)

“fortunately” a new, even bigger, sea-storm occured during C2 …

C2

C1

Ground seism

Marionetta Mirror

A good simulation of the Marionetta 2 Mirror mechanical TFsis important for implementing simulation of:

• mirrors Local Controls (x and y )

• ITF Linear Alignement (x and y )

• ITF Lock acting from the Marionette (z)

Marionetta Mirror (z)

Siesta, since v3r88

1/ f 4

Measured (Luciano)

Marionetta Mirror (y)

Siesta

Measured

Marionetta Mirror (x)

SiestaTM wires:

400 m

200 m

Measured

NOW

Marionetta Z modes [Hz]Measured Siesta

(P) 0.415 0.419 (+1%)

(Z) 0.422 0.429 (+1.5%)

(P) 0.462 0.465 (+0.5%)

(Z) 0.498 0.489 (-2%)

(P) 0.5 0.504 (+0%)

(ZP) 0.6 0.596 (-0%)

(ZP) 0.665 0.67 (+0.7%)

(P) 0.74 0.745 (+0.5%)

(Z) 0.765 -

(P) 0.789 -

(Z) 0.83 0.793 (-4%)

(P) 0.98 0.96 (-2%)

- (Z) 1.06

- (P) 1.08

(Z) 1.2 1.2 (0%)

(P) 1.21 1.22 (0.8%)

(Z) 1.37 -

(P) 1.39 -

y modes [Hz]Measured Siesta(P) 0.01575 0.0158 (+0.3%)

(Z) 0.01725 0.0171 (-0.9%)

(P) 0.0315 0.0313 (-0.6%)

(Z) 0.041 0.0393 (-2%)

(P) 0.0435 0.0432 (-0.7%)

(Z) 0.7 0.698 (-0.3%)

(P) 0.875 0.865 (-1%)

(P) 1.21 1.17 (-3%)

x modes [Hz]Measured Siesta

(P) 0.415 0.422 (+1.7%)

(Z) 0.449 0.448 (-0.2%)

(P) 0.46 0.466 (+1%)

(Z) 1.718 1.727 (+0.5%)

(P) 2.39 2.30 (-3.8%)

(Z) 3.475 3.7 (+7%)

ITF Lock with Marionetta

What is there : What is still missing :

C

Noise DAC

dL

B1p_quadB7_DC

• 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

B7

B1

seism F7 coil

(I.Fiori, A.Gennai, G.Losurdo)

Compensator

f 4

25 Hz

G 2E+5

45°

f -2

(f 3)

Linear Locking (from Marionetta)

0.1%

“Lock Quality” similar to standard-lock simulation

Lock Transition: Mirror Mario

Err

Coil RM(pole @ 480 Hz)

Anti-TRIGGER

Coil F7(pole @ 8.8 Hz)

x

TRIGGERRamp 10s

x

DAC noise (300nV/sqrt(Hz))

DAC noise (300nV/sqrt(Hz))

Err_mario

Err_lisa

RM coils DAC noise turned OFF

Lock Transition: Mirror Marionetta

10s RAMP 10s RAMP

Sensitivity curve

Can improve the compensator (lower unity gain)

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