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
Jan 02, 2016
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