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GEO 600 Simulation Group

GEO 600 Simulation Group. Andreas Freise ILIAS WG1 Meeting CERN (29-Mar-07). Simulation Work in GEO . GEO in this sense is not GEO 600 but the people in GEO related research groups Simulation work consists of: Theoretical understanding of the physics

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GEO 600 Simulation Group

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  1. GEO 600 Simulation Group Andreas Freise ILIAS WG1 Meeting CERN (29-Mar-07)

  2. Simulation Work in GEO • GEO in this sense is not GEO 600 but the people in GEO related research groups • Simulation work consists of: • Theoretical understanding of the physics • Coding the physics (algorithm development) • Coding, maintaining, documenting software • Using simulations to produce modelled data(commissioning, detector design, table-tops, … • Understand more about the modelled experiment from the modelled data ILIAS WG1 - CERN - 29/03/2007

  3. The GEO Collaboration New Materials R+D Laser Development Interferometer Prototypes Detector Commissioning GW Source Modelling Data Analysis Design of future GW Detectors Suspension Development InterferometryR+D LISA Instrument Development Squeezed Light R+D Laser Development ILIAS WG1 - CERN - 29/03/2007

  4. The GEO Collaboration • Relatively small collaboration • Entangled with several large projects • Subgroups develop automatically • Possible Remedy: • Create topic based groups • Members are contact points to the various activities • Strengthen and develop a GEO 'identity' • Test in progress: the simulation group ILIAS WG1 - CERN - 29/03/2007

  5. The GEO Simulation Group • Members (as of 22.01.07): Andreas Freise, Stefan Hild, Kentaro Somiya, Sabina Huttner, Roland Schilling, Paul Cochrane, Jan Harms, Gudrun Diederichs, Simon Chelkowski, Antonio Perreca, Jonathan Hallam, Oliver Bock • Meetings : 16.01.07 (Hannover), 13.03.07 (Hannover) • Resources: Website (Wiki), mailing list, svn repositories ILIAS WG1 - CERN - 29/03/2007

  6. The GeoSim Website • www.sr.bham.ac.uk/dokuwiki/doku.php?id=geosim:home • A public Wiki with restricted write access • Hosts • Meeting dates • Talks of past meetings • References to GEO experiments • Links to simulation programs and software tools • Summaries of current or open tasks • …. ILIAS WG1 - CERN - 29/03/2007

  7. Code from the good old days • OptoCad • 2D CAD program that traces Gaussian beams through an optical layout (GEO, VIRGO, LISA) • WaveProp • FFT propagtion code (somewhat like DarkF)(GEO) • LISO • Numerical electronic circuit simulator, specialised tool for building electronic filters • Finesse • Numerical Interferometer Simulation, uses Hermite-Gauss modes in the frequency domain (GEO, LIGO, VIRGO, TAMA) ILIAS WG1 - CERN - 29/03/2007

  8. OptoCad: Alignement tolerancing of the LISA Pathfinder optical bench (Gudrun Diederichs) ILIAS WG1 - CERN - 29/03/2007

  9. OptoCad: Alignement tolerancing for LISA Pathfinder ILIAS WG1 - CERN - 29/03/2007

  10. OptoCad and Finesse ILIAS WG1 - CERN - 29/03/2007

  11. Simple Two-Mirror Cavity Finesse output ILIAS WG1 - CERN - 29/03/2007

  12. Finesse: Current Activities • GEO commissioning • Using Finesse to 'debug' GEO by matching simulations to experimental results • Maintain a configuration file which is in sync with GEO reality • Quantum noise extension • For the design and commissioning of future detectors we need a proper description of quantum noise • Implementation of quantum noise is 50% complete • Adding new features • Phasemaps, Matlab interface, New detector types • Testing and code documentation • Unit tests, Code cleaning, Doxygen documentation ILIAS WG1 - CERN - 29/03/2007

  13. GEO Commissioning ILIAS WG1 - CERN - 29/03/2007

  14. GEO Commissioning ILIAS WG1 - CERN - 29/03/2007

  15. Shotnoise • New algorithm to compute shotnoise for N carrier/ modulation fields and M demodulations (paper submitted) New Finesse command 'qshot' Preliminary ILIAS WG1 - CERN - 29/03/2007

  16. The missing factor of two The modelled shotnoise did not match the measuredsensitivity. Often we were apparently missing a factorof two or sqrt(2). Do we understand why? YES ILIAS WG1 - CERN - 29/03/2007

  17. Adding Phasemaps to Finesse ILIAS WG1 - CERN - 29/03/2007

  18. Finesse with Phasemaps • Analyse the effectsof mirror surfacedefects • Study aperture effects(clipping) • Simulate flat beams ILIAS WG1 - CERN - 29/03/2007

  19. The Finesse Code • Code is being re-organised and cleaned (Paul Cochrane) • It is now hosted in a svn repository and is currenlty changed regularly by three developers • Extensive code documentation via Doxygen • Manual (also extensive) is supplemented by in-depth explanations of GEO input files • Started to introduce unit tests of single functions:about 50% of the code base (43000 lines) is testednightly ILIAS WG1 - CERN - 29/03/2007

  20. New Activities • LISA BBO Simulator (Jan Harms) • Thermal effects via FFT simulations (Jerome Degallaix) • Non-linear cavity simulator (Nico Latzka) • Simulating mirrors as elastic deformable objects(Yanbei Chen) • AdLIGO, Optickle (Kentaro Somiya) • …. ILIAS WG1 - CERN - 29/03/2007

  21. Conclusion • New GEO Simulation Group has been started • So far it works very well and has initiated or vitalised several activities related to GEO 600 and/or simulations • The group aims at forming a communication hub inside the GEO collaboration • This will also benefit the links between GEO and other projects • Link of the GeoSim meetings with LSC meetings planned ILIAS WG1 - CERN - 29/03/2007

  22. end ILIAS WG1 - CERN - 29/03/2007

  23. GEO Commissioning • GEO optical layout with OptoCad • Stores the location of the optics (lengths, angles) • Is used to understand spurious beams, etc. • Finesse input file for GEO • Computes control signals and transfer functions • Used to compute noise couplings and the detector sensitivity • WaveProp for thermal lensing • Is used only for special task which require a time-domain or FFT approch • LISA is a mission to detect and observe gravitational waves ILIAS WG1 - CERN - 29/03/2007

  24. The GEO Collaboration • LISA is a mission to detect and observe gravitational waves ILIAS WG1 - CERN - 29/03/2007

  25. The GEO Collaboration • LISA is a mission to detect and observe gravitational waves ILIAS WG1 - CERN - 29/03/2007

  26. The GEO Collaboration • LISA is a mission to detect and observe gravitational waves ILIAS WG1 - CERN - 29/03/2007

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