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ABOUT CALIBRATION

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November/December calibration (1) Issues before november ... (bruit blanc(NE/WE), donn es sans injection) Fr quence/Amplitude lignes de calibration par WSR ... – PowerPoint PPT presentation

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Title: ABOUT CALIBRATION


1
ABOUT CALIBRATION
2
November/December calibration (1)
  • Issues before november
  • Free Michelson calibration
  • NE 13.74 0.34 µm/V
  • WE 12.14 0.30 µm/V
  • Recycled ITF calibration line ratio
  • NE/WE 1.38 _at_ 100 Hz
  • NE/WE 1.43 _at_ 350 Hz

? NE/WE 1.13
3
November/December calibration (2)
Comparison of the currents in the up and down
coils of the WE mirror
  • After DAC change
  • Both channels within 3.5
  • Calibration line ratio WE/NE 0.10,
  • compatible with gain calibration

Investigations end of November ? DAC issue !
4
November/December calibration (3)
High Power actuator gain measurements -- Free
Michelson configuration (High Power mode) ? gain
decrease with frequency
NE tower
To do Check new HrecMichelson ? Measure the TF
phase also
5
November/December calibration (4)
Low noise actuator gain measurements -- locked NE
cavity (HP/LN) configuration
? Still to be confirmed and analysed
Variation of actuator gain vs frequency , and
coil driver mode ? ? Understanding of the
coil driver TF ? Other
6
Coil driver synoptics (end towers)
zCorr zCalib
6 kO
7
TF model of the coil drivers
  • High power mode (end towers)

10 µs
??
??
10
8
TF model of the coil drivers
  • Low noise mode (end towers)

10 µs
??
??
10
WARNING Emphasis/De-emphasis not yet corrected
in the following results !
9
NE TF in High Power mode (1)
Coherence
Measured TF
Corrected TF
Modulus
Modulus
Ca_NE_RM_Coil Vs Sc_NE_zCorr
  • White noise injection ? 1 kHz
  • Red/black up/down channels
  • Modulus compatible with model 10 errors ?
  • Phase too much delay

Phase
Phase (rad)
10
NE TF in High Power mode (2)
Coherence
Measured TF
Corrected TF
Modulus
Modulus
Ca_NE_RM_Coil Vs Sc_NE_zCorr
  • Reduced the model delay by 140 µs (black channel)
  • Phase within 1 from 0
  • (should use 150 µs for the red channel)
  • ORIGIN of the missing delay ?

Phase (rad)
Phase
11
NE TF in Low Noise mode (1)
Coherence
Measured TF
Corrected TF
Modulus
Modulus
Ca_NE_RM_Coil Vs Sc_NE_zCorr
  • Step 12 data
  • Red/black up/down channels
  • Modulus
  • Missing gain 730
  • compatible within 10
  • Phase missing delay

Phase (rad)
Phase
12
NE TF in Low Noise mode (2)
Coherence
Measured TF
Corrected TF
Modulus
Modulus
Ca_NE_RM_Coil Vs Sc_NE_zCorr
  • Additionnal delay 170 µs (black channel)
  • Additionnal gain 750
  • Phase within 7 from 0
  • ORIGIN of the missing delay and gain ?

Phase (rad)
Phase
13
WE TF in Low Noise mode
  • Same results for the WE coil TFs
  • Additionnal delay 170 µs
  • Additionnal gain 750
  • (note that the up and down channels are in phase
    opposition...
  • Alain corrected it yesterday 11/01/07)

Ca_WE_RM_Coil Vs Sc_WE_zCorr
14
Divers
  • Sauvegarde des données de calibration de
    novembre/décembre
  • À Cascina /data/procdata/bufferv2/calibration
  • À Lyon, sur hpss
  • Création dune base de données calibration ?
  • temps GPS, configurations des données
  • mesures des gains des actionneurs
  • Temps GPS des données calibration WSR
  • (bruit blanc(NE/WE), données sans
    injection)
  • Fréquence/Amplitude lignes de calibration par WSR

15
Divers
  • Modifications du module Cali
  • Classement des fichiers (TF, sensibilité,
    horizon) par année et par mois dans
    /virgoData/Cali à Cascina
  • TF et sensibilité sauvées en ROOT, vect et ASCII
  • Possibilité de sauver les fichiers dans un
    répertoire personnel en argument
  • ? à mettre online (mais arguments modifiés)
  • Note calibration des actionneurs en cours de
    rédaction
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