1. S2/S3 calibration Gabriela González, Louisiana State University Plus
Justin Garofoli, Michael Landry, Luca Matone, Hugh Radkins (LHO), Rana Adhikari, Peter Fritschel (MIT), Szabi Marka, Peter Shawhan, Patrick Sutton (Caltech), Brian O’Reilly (LLO)
Plus
Xavier Siemens (UWM), Martin Hewittson (GEO) (welcome!)
LIGO Science Collaboration meeting, March
March 17, 2004

2. Frequency dependent calibration: key formulas
interferometer
digital filters
pendulum
D(f)
DARM_ERR
Open loop gain
Optical gain
Digital gain
March 17, 2004

3. Measurement and modeling
DC gain (measured)
Pendulum (modeled)
At a reference time (2-3 times in science run):
Open loop gain (measured)
Digital gain (known)
sensing function (modeled, gain inferred)
inferred (SenseMon)
Measured(SenseMon)
In frames
March 17, 2004

4. S2 calibration: V3 (final)
Rana’s, Peter’s Matlab Models: L1IFOparams.m, H1IFOparams.m, H2IFOparams.m, LSCModel.m
are used by Mike, Brian, Gaby to produce reference functions …
S02-H1-CAL-OLOOP_GAIN txt.gz
S02-H1-CAL-CAV_GAIN txt.gz
S02-H1-CAL-RESPONSE txt.gz
that Patrick’s SenseMon (and Gaby afterwards) uses to produce alphas, betas… L1Alpha.Beta.txt, H1AlphaBeta.txt, H2AlphaBeta.txt (Peter Fritschel: H1AlphaBetaSmooth.txt)
and Duncan Brown converts everything into frames… H-CAL_REF_V gwf
H-CAL_FAC_V gwf
March 17, 2004

5. S2 noise curves
strain/rtHz
Hertz
March 17, 2004

6. L1 a, b 3%
<0.7%
March 17, 2004

7. L1 a, b
March 17, 2004

8. H1 a, b
10% 3%
March 17, 2004

9. S2 L1 errors Magnitude: Mike Landry, Brian O’Reilly Preliminary!
Da/a~3%
March 17, 2004

10. S2 L1 errors Phase: Mike Landry, Brian O’Reilly Preliminary! Da/a~3%
March 17, 2004

11. S2 H1 errors Magnitude: Early epoch: Da/a~10% Mike Landry,
Brian O’Reilly
Preliminary!
March 17, 2004

12. S2 H1 errors Magnitude: Final epoch: Da/a~3% Mike Landry,
Brian O’Reilly
Preliminary!
March 17, 2004

13. S2 H1 errors Phase: Early epoch: Da/a~10% Mike Landry, Brian O’Reilly
Preliminary!
March 17, 2004

14. S2 H1 errors Phase: Final epoch: Da/a~3% Mike Landry, Brian O’Reilly
Preliminary!
March 17, 2004

15. S3 calibration: dynamic b
interferometer
digital filters
pendulum
D(f)
DARM_ERR
Open loop gain
Optical gain
Digital gain
March 17, 2004

16. S3 calibration : dynamic b
A dynamic b:
calculated at 16384Hz,
low pass filtered at ~0.5 Hz,
Read at ~8 Hz(?), written at 16 Hz, averaged by SenseMon at 1/60s
L1 – S3 ab b a
Notice the amplitude and time scale!!
March 17, 2004

17. S3 online H1 a, b
Patrick
Sutton
March 17, 2004

18. S3 online H1 a, b
Patrick
Sutton
March 17, 2004

19. S3 calibration: V1 (Jan 22, 2004)
March 17, 2004

20. S3 online Calibration Patrick Sutton Gets better if V1 is used!
March 17, 2004

21. S3 online Calibration Patrick Sutton Gets better if V1 is used!
March 17, 2004

22. S3 H1 Calibration
March 17, 2004

23. Calibration Status S2 calibration: S3 calibration: S4 calibration:
final V3 version posted Sept’03
document (with errors) in preparation
S3 calibration:
Online (E10) calibration
V1 calibration, posted on Jan’04
V2, final calibration (coming):
calibration for LHO injection times (V1.1?)
models representing better the actual hardware
S4 calibration:
Online info from Sensemon (P. Sutton)
On line time-domain calibration (X. Siemens)
faster tracking of line amplitudes
photon calibrator
March 17, 2004