Transcript SimLIGO1, Preliminary Design

Systems Constructed in E2E
Matthew Evans
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Han2k
» Model of the LHO 2k IFO
» Designed for lock acquisition study
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SimLIGO1
» Model of all LIGO 1 IFOs
» Designed for
– noise hunting
– detailed lock acquisition
– modification testing
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Han2k
LHO 2k IFO
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Han2k Simulation
Detail sufficient for lock acquisition
modeling
…but insufficient for detailed study
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Perfect alignment
Perfect mode-matching
Only seismic noise
Simplified mechanics and electronics
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SimLIGO1
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A Detailed Model of each IFO
» Modal Beam Representation (alignment, mode matching, thermal lensing)
» All major noise sources (seismic, thermal, sensing, laser frequency, electronic,
mechanical)
» 3D Mechanics
» Complete analog and digital electronics chains
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With Expanded Capabilities
» Noise Studies
– Non-linearity (cavity dynamics, electronic saturation, digitization, etc.)
– Bilinear coupling
» Sophisticated Lock Acquisition
» Upgrade Testing
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Note: items in black are TBD
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SimLIGO1:
The Detector
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“Detector” is the top level box
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Environment
PSL and IOO
COC
Digital ISC
Detector
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SimLIGO1:
The Environment
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Environmental Data (temperature, humidity, etc.)
Noise Sources
» Seismic
– correlated ground motion
– 6x6 transfer functions for BSC and HAM
» Acoustic
» Gravity Gradient
» Other?
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Signal Sources
Environmental Monitor
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SimLIGO1:
PSL and IOO
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PSL
» Laser source
» Phase modulators
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PSL
IOO
» Output frequency
noise
» Frequency
feedback paths
IOO
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SimLIGO1:
Core Optics Components
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Large Optics Suspensions
» One for each optic
» Driven by suspension point
motion from the Environment
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Optical Components
COC
» Customizable to each IFO
» Radiation pressure
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Sensing Electronics
» LSC and ASC detectors with
shot noise
» Detailed electronics chain
leading to Pentek ADCs
Optics
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SimLIGO1:
Digital ISC
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LSC
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» Switchable input matrix
– Full detection mode
– Automated acquire mode
» Full output matrix
» Error and Control signal test points
» Digital filter banks identical to onsite filters
ASC
» Limited Input matrix
» Full output matrix
» Error and Control signal
test points
» Digital filters banks
identical to on-site filters
LSC
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SimLIGO1:
Large Optics Suspension
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3D Suspension Mechanics
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6 DOF suspension point motion
Pitch-position coupling
4 sensor/actuator points
Post hoc internal modes
LOS
Digital Controller
» Dual sample rate
» Pitch-position
decoupling filters
» Adjustable output
matrix
Controller
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Future work
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TBD Highlights
» Gravitation wave phase modulation in propagators
» Ground motion data and model
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Parameter Hunting and Gathering
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Optical parameters for each IFO
Guoy Telescopes
As-Build asymmetries and imperfections
On-The-Floor transfer functions and noise spectra for all analog boards
Testing and Validation
Application to Real Problems
» Noise hunting
» Modification testing
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