lsc meeting at lho ligo-g020364-00-e 1august. 21, 2002 simligo : a new ligo simulation package 1....
DESCRIPTION
LSC Meeting at LHO LIGO-G E 3 SimLIGO A Detailed Model of LIGO IFO Modal beam representation »alignment, mode matching, thermal lensing 3D mechanics »6x6 stack transfer function »3D optics with 4 local sensor/actuator pairs Complete analog and digital electronics chains with noise »Common mode feedback »WFSs »“Noise characterization of the LHO 4km IFO LSC/DSC electronics” by PF and RA, March 2002 included All major noise sources »seismic, thermal, sensing, laser frequency and intensity, electronics, mechanicalTRANSCRIPT
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LSC Meeting at LHOLIGO-G020364-00-E 1August. 21, 2002
SimLIGO : A New LIGO Simulation Package
1. e2e : overview2. SimLIGO3. software, documentations and discussions
Hiro YamamotoLIGO Laboratory / California Institute of Technology
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e2eoverview
General purpose GW interferometer simulation framework» Generic tool like matlab or mathematica» Time domain simulation written in C++» Optics, mechanics, servo, ...
– time domain modal model– single suspended 3D mass, MSE - modular mechanical modeling tool– analog and digital controller - ADC, DAC, digital filter, etc
LIGO I simulation packages» Han2k : used for the lock acquisition design
– simple seismic noise, all analog servo, 1D mass, etc– fast simulation of LIGO– cavity response with misalignment - Bill Kells– thermal lensing effect on lock acquisition - Biplab Bhawal
» SimLIGO : to assist LIGO I commissioning
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LSC Meeting at LHOLIGO-G020364-00-E 3
SimLIGOA Detailed Model of LIGO IFO
Modal beam representation» alignment, mode matching, thermal lensing
3D mechanics» 6x6 stack transfer function» 3D optics with 4 local sensor/actuator pairs
Complete analog and digital electronics chains with noise» Common mode feedback» WFSs» “Noise characterization of the LHO 4km IFO LSC/DSC electronics” by PF
and RA, 12-19 March 2002 included All major noise sources
» seismic, thermal, sensing, laser frequency and intensity, electronics, mechanical
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SimLIGOPurpose
Performance of as-built LIGO» effect of the difference of two arms, etc
Noise study» Non-linearity
– cavity dynamics, electronic saturations, digitization, etc» Bilinear coupling
Lock instability Sophisticated lock acquisition Upgrade trade study
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LSC Meeting at LHOLIGO-G020364-00-E 5
SimLIGOSystem structure
Digital ISC
PSL
LOS (mechanics, DSC)
IOO COC Analog ISC
Environment (ground, stack)
Mechanical Interfaces Optical Interfaces Electrical Interfaces
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SimLIGOEnvironment, PSL, IOO
Seismic motion» Correlated ground motion based on seismic psd and coherence data
– rotation and tilt are assumed to be iduced by the translational motions of piers talk this afternoon, work starting with S.Yoshida
– need data for LLO (day and night)» 6x6 transfer functions for BSC and HAM
PSL and IOO» Laser with frequency and intensity noise» 2 phase modulators» Frequency feedback» Built using filters to function as is designed» To study the MC dynamics, triangular cavity with suspended mirrors
needs to be and can be placed
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SimLIGOCore Optics Components - 1
Large Optics Suspensions» Driven by suspension point motion» Single suspended 3D mirror
– 4 sensors and actuators– optical levers– Pitch-position coupling– bounce mode and wedge angle effect
» Digital Controller– Dual sampling rate– pitch-position decoupling filter– Adjustable output filter
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SimLIGOCore Optics Components - 2
Optical Components» Customizable for each IFO» Mirror aberration causing mode coupling - tbd» Radiation pressure - tbd
Sensing Electroinics» LSC and ASC detectors with shot noise» Detailed electronics chain leading to Pentek ADCs» Detectors can have proper mechanical motion
Scattering noise - tbd
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SimLIGODigital ISC
LSC» Switchable input matrix
– full detection mode– automated acquire mode - tbd
» Full output matrix» Digital filter banks identical to on-site filters» Error and control signal test points
ASC» under construction
– waited until a design is completed
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SimLIGONoise components
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Hz
SimLIGO Sensitivity (analytic) w/ TAS = 1.25e 3
TotalSeismicShotADCDACPDCoilWhiteDewhiteAI
optical lever
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LIGO data vs SimLIGO
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LHO 4kLHO 2kLLO 4kSimLIGO
Triple Strain Spectra - Thu Aug 15 2002St
rain
(h/rt
Hz )
rana-1029490757.pdf
Frequency (Hz)
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e2e software package software, documentations, discussions
Homepage» www.ligo.caltech.edu/~e2e/
e2e tarbal downloadable from e2e homepage» e2e-version.tar.gz, SimLIGO.tar.gz, Han2k.tar.gz
Documentations» all downloadable from e2e homepage» Han2k users manual» SimLIGO
– System structure– How to guide– Physics (to be completed)
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e2ediscussions via maillist
Communications among e2e users using mail list» ligo-e2e-announcement
– announcement about new release» ligo-e2e-physics
– discussion about simulation related issue» ligo-e2e-GUI
– alfi - graphical front end of e2e - related issues» ligo-e2e-programming
– C++, JAVA, thread, etc