GRAVITATIONAL WAVE DETECTION
CONTENTS INTRODUCTION GEO 600 DESIGN CON?GURATION SIGNAL EXTRACTION SENSITIVITY OF GEO MEASURING GRAVITATIONAL WAVES APPLICATION TO CALIBRATING GEO CALIBRATION AND DAQ REQUIREMENTS SET FROM ASTROPHYSICAL SEARCHES SIGNALS FROM CONTINUOUS WAVE SOURCES SIGNALS FROM THE STOCHASTIC GRAVITATIONAL WAVE BACKGROUND SIGNALS FROM INSPIRALLING BINARY OBJECTS SIGNALS FROM BURST TYPE SIGNALS GEO AS PART OF A DETECTOR NETWORK SUMMARY DATA ACQUISITION AND STORAGE SYSTEM REQUIREMENTS HARDWARE COMPONENTS THE DATA COLLECTING UNITS DATA ARCHIVING SYSTEM OVERVIEW SOFTWARE DESIGN AND THE DATA ?OW MODEL SYSTEM CON?GURATION INTERFACE DATA ?OW MODEL DCU SOFTWARE DATA ARCHIVING SOFTWARE AND SIGNAL PROCESSING SYSTEM ADMINISTRATION AND CON?GURATION SYSTEM TIMING ACCURACY AND STABILITY GROSS TIMING ACCURACY SYSTEMATIC TIMING OFFSETS FINE TIMING ACCURACY LONG-TERM TIMING STABILITY LONG-TERM TIMING STABILITY DURING S1 SCIENCE RUN CONCLUSIONS SYSTEM DIAGNOSTICS AND ALARM SYSTEM ENVIRONMENTAL SIGNAL CALIBRATION AND DE-WHITENING USER INPUT SYSTEM CALIBRATION INFORMATION STORAGE AN EXAMPLE CALIBRATION PROCEDURE CALIBRATING THE POWER-RECYCLED GEO PRINCIPLES OF CALIBRATING THE POWER-RECYCLED GEO THE MICHELSON LOCKING SCHEME THE MICHELSON CONTROL SERVO INDUCING A KNOWN MIRROR DISPLACEMENT THE ELECTRO-STATIC DRIVES (ESDS) MEASURING THE OPTICAL GAIN OF THE DETECTOR RECORDING THE SIGNALS A MODEL OF THE MICHELSON LOCKING SERVO RELATIVE GAIN FEEDBACK PATHS CLOSED-LOOP TRANSFER FUNCTION REAL-TIME CALIBRATION DERIVING THE CALIBRATION EQUATION UP-SAMPLING THE OPTICAL AND RELATIVE GAINS ISSUES OF SIGNAL DYNAMIC RANGE AND NUMERICAL PRECISION SUPPRESSING THE CALIBRATION LINES SIGN CONVENTION OF GEO APPLICATION TO THE S1 SCIENCE RUN STABILITY OF THE INPUT CALIBRATION LINES RESULTS AND CHARACTERISATION OF THE CALIBRATION PROCESS VALIDATING THE CALIBRATION SCHEME CALIBRATION ACCURACY CALIBRATION BANDWIDTH A SUMMARY OF THE CALIBRATION PROCEDURE 3 10 FUTURE REQUIREMENTS AND IMPROVEMENTS CALIBRATION OF THE DUAL-RECYCLED GEO 600 : PRINCIPLES IMPROVING TECHNIQUES FROM THE POWER-RECYCLED GEO CALIBRATION SCHEME IMPROVEMENTS CARRIED FORWARD MODELLING THE OPTICAL RESPONSE OF THE DRMI OBTAINING THE OPTIMAL SIGNAL-TO-NOISE RATIO OF THE CALIBRATION TIME-DOMAIN CALIBRATION OF DR GEO SYSTEM IDENTI?CATION PROCESS CORRECTING FOR THE OPTICAL RESPONSE CORRECTING FOR THE LENGTH-CONTROL LOOP CALCULATING THE STRAIN SIGNAL SUMMARY OF THE PROCEDURE CALIBRATION OF THE DUAL-RECYCLED GEO 600 — SIMULATIONS AND SOFTWARE SIMULATION SETUP SIMULATION OUTPUTS CALIBRATION SOFTWARE SYSTEM IDENTI?CATION OPTICAL CORRECTION CALCULATION OF THE STRAIN SIGNAL OUTPUT OF SOFTWARE SIMULATION EXPERIMENTS EXPERIMENT 1 – TIMING ASPECTS OF THE PIPELINE EXPERIMENT 2 – PERFORMANCE OF THE OPTICAL ?LTER EXPERIMENT 3 – OVERALL OPTICAL GAIN CORRECTION EXPERIMENT 4 – SYSTEM IDENTI?CATION PERFORMANCE WITH ?XED OPTICAL GAIN EXPERIMENT 5 – SYSTEM IDENTI?CATION PERFORMANCE WITH VARYING OPTICAL GAIN CALIBRATION OF THE DUAL-RECYCLED GEO 600 — APPLICATION TO THE S3 SCIENCE RUN EXPERIMENTAL SETUP AND DETECTOR DETAILS OPTICAL RESPONSE OF THE DETECTOR LENGTH-CONTROL SERVO ELECTRONICS CLOSED-LOOP TRANSFER FUNCTION OF THE MICHELSON SERVO DEMODULATION PHASE FOR HIGH-POWER DIODE INJECTED CALIBRATION LINES RECORDING OF RELEVANT SIGNALS LENGTH-CONTROL SERVO CORRECTION RESULTS AND VALIDATION FREQUENCY-DOMAIN CALIBRATION COMPARISON RECOVERED PARAMETERS CALIBRATION SUPPRESSION PERFORMANCE