ADVANCES IN GRAVITATIONAL WAVE DETECTION
CONTENTS 1 INTRODUCTION 1 1 DETECTION OF GRAVITATIONAL WAVES 1 2 A WORLD WIDE NETWORK OF LARGE-SCALE GRAVITATIONAL WAVE DETECTORS 1 3 A BRIEF DESCRIPTION OF THE GE0 600 GW DETECTOR 2 DEMONSTRATION AND COMPARISON OF TUNED AND DETUNED SIGNAL RECYCLING 2 1 INTRODUCTION 2 2 CONTROL SCHEME FOR SIGNAL RECYCLING IN GEO 600 2 3 A NEW METHOD FOR LOCKING TUNED SIGNAL RECYCLING 2 3 1 SIMULATION OF THE CONTROL PARAMETERS FOR TUNED SIGNAL RECYCLING 2 3 2 CALIBRATION OF THE ACTUATOR STRENGTH 2 4 MEASUREMENTS OF OPTICAL GAIN 2 5 REDUCTION OF THE RF AMPLITUDE MODULATION 2 6 COMPARISON OF NOISE TRANSFER FUNCTIONS FOR TUNED AND DETUNED SIGNAL RE- CYCLING 2 7 CALIBRATED DETECTOR SENSITIVITY FOR TUNED SIGNAL RECYCLING 2 8 COMPARISON OF DETUNED SIGNAL RECYCLING FOR UPPER AND LOWER OPERATING POINT 2 9 SUMMARY 3 SCATTERED LIGHT PROBLEMS IN INTERFEROMETRIC GRAVITATIONAL WAVE DETECTORS 3 1 INTRODUCTION 3 2 CONTROLLED STRAY LIGHT INJECTIONS 3 2 1 HOW TO PRODUCE STRAY LIGHT SOWING UP IN H AT 1 KHZ 3 2 2 A DEVICE FOR CONTROLLED STRAY LIGHT GENERATION 3 2 3 LOW FREQUENCY LARGE AMPLITUDE SCENARIO 3 2 4 HIGH FREQUENCY LOW AMPLITUDE SCENARIO 3 2 5 COMBINATION OF THE TWO SCENARIOS 3 2 6 SUMMARY OF THE STRAY LIGHT INJECTIONS 3 3 INDICATIONS FOR A STRAY LIGHT LIMITED SENSITIVITY 3 4 THE ?LTER EXPERIMENT: A RELIABLE METHOD TO IDENTIFY THE SOURCE OF STRAY LIGHT 3 4 1 LIMITATIONS OF THE ?LTER EXPERIMENT 3 5 EXPERIENCE OF STRAY LIGHT PROBLEMS IN GEO 3 6 THE CAT’S EYE E?ECT 3 7 A SPECIAL CLASS OF STRAY LIGHT NOISE: THE ”RIPPLES” 3 8 SUMMARY 4 PHOTON PRESSURE CALIBRATION 4 1 INTRODUCTION 4 2 EXPERIMENTAL SETUP OF THE PHOTON PRESSURE CALIBRATOR 4 2 1 MEASUREMENT OF THE MODULATED LIGHT POWER 4 3 INJECTIONS WITH DI?ERENT AMPLITUDES 4 4 INJECTIONS WITH DI?ERENT FREQUENCIES 4 5 VALIDATION OF THE O?CIAL CALIBRATION 4 5 1 TRANSFER FUNCTION FROM ESD TO H 4 5 2 ESD INJECTIONS UP TO HIGH FREQUENCIES 4 6 THE PHASE PICTURE 4 7 NON-RIGIDITY OF THE TEST MASS 4 7 1 ROUGH ESTIMATION OF PHOTON PRESSURE CALIBRATOR INDUCED TEST MASS DEFORMATION 4 7 2 FINITE ELEMENT ANALYSIS OF PHOTON PRESSURE CALIBRATOR INDUCED TEST MASS DEFORMATION 4 7 3 E?ECTIVE TEST MASS DISPLACEMENT 4 7 4 COMPARISON OF PENDULUM RESPONSE AND MIRROR DEFORMATION 4 7 5 HIGH FREQUENCY INJECTIONS USING THE PHOTON PRESSURE CALIBRATOR 4 7 6 IN?UENCE OF BEAM JITTER TO THE PHOTON PRESSURE CALIBRATION 4 7 7 CONCLUSION AND CONSEQUENCES 4 8 E?ECTS FROM TEST MASS ROTATION 4 8 1 METHOD TO DETERMINE THE O?CENTERING OF THE PHOTON PRESSURE CAL- IBRATOR 4 9 DETERMINING THE SIGN OF H 4 10 SUMMARY 5 A STATISTICAL VETO METHOD EMPLOYING AN AMPLITUDE CONSISTENCY CHECK 5 1 INTRODUCTION 5 2 MOTIVATION FOR A STANDARD STATISTICAL VETO FOR GEO 600: HOURLY MAINS GLITCHES 5 3 MOTIVATION FOR A STATISTICAL VETO WITH AMPLITUDE CONSISTENCY CHECK: DUST FALLING THROUGH LASER BEAMS 5 4 DESCRIPTION OF THE EVENT TRIGGER GENERATOR USED: MHACR 5 4 1 ESTIMATION OF BURST PARAMETER WITH MHACR 5 5 THE STANDARD STATISTICAL VETO 5 5 1 THE METHOD IN GENERAL 5 5 2 APPLICATION OF A STANDARD STATISTICAL VETO TO GEO S5 DATA 5 6 A STATISTICAL VETO FOR CHANNELS CONTAINING GW INFORMATION 5 6 1 THE METHOD IN GENERAL 5 6 2 A ‘REAL-WORLD’ SCENARIO 5 7 APPLICATION OF A STATISTICAL VETO WITH A AMPLITUDE CONSISTENCY-CHECK TO GEO 600 DATA 5 7 1 DATA SET 1: FULL SEPTEMBER 2006 WITH LOW DUST CONCENTRATION 5 7 2 DATA SET 2: 8 HOURS FROM MAY 2006 WITH HIGH DUST CONCENTRATION 5 7 3 PERFORMANCE OF THE VETO ANALYSIS 5 8 SUMMARY 6 TOWARDS DC-READOUT FOR GEO 6 1 INTRODUCTION 6 2 MOTIVATION 6 2 1 SHOT NOISE 6 2 2 OSCILLATOR PHASE NOISE 6 2 3 ELECTRONIC NOISE OF THE MAIN PHOTO DIODE 6 3 DETERMINATION OF THE OPTIMAL DARK FRINGE O?SET 6 4 TECHNICAL REALIZATION 6 5 SUMMARY AND OUTLOOK